Sessions - DPG-Tagungen

Nuclear Physics Sectional Programme Overview
Sessions
– Invited and Contributed Lectures, Posters –
HK 1 Plenary Session
Time: Monday 13:15–15:15 Room: P
Plenary Talk HK 1.1 Mon 13:15 P
Evolution of Quadrupole Collectivity from Proton-Neutron Interaction
— •Christoph Fransen — Institut für Kernphysik, Universität
zu Köln
Nuclei can exhibit single-particle and collective properties. The evolution
from one extreme to the other is one of the most interesting phenomena
in nuclear structure physics. The proton-neutron (pn) interaction
(QpQn) couples the pn subsystems to form pn symmetric and
non-symmetric (mixed-symmetric) states at low energies. The local shell
structure and the nucleon numbers determine the strength of this coupling
and, consequently, the pn-structure of the nuclear wave function.
The nuclear mass region A ≈ 90 enables us to study this structural evolution
in great detail. Comprehensive data on off-yrast low-spin states in
that mass region was collected in unprecedented richness. Clear evidence
for the pn symmetry character of excited nuclear states is obtained from
measured electromagnetic transition matrix elements [1,2]. The deduced
evolution of the pn symmetry character of low-lying quadrupole excitations
in this mass region will be discussed.
Supported by the DFG under Contracts No. Pi 393/1-2, Br 799/8-2/9-1, and
No. Kn 154/30 and the U.S. NSF under Grant No. PHY-0098813. [1] N.
Pietralla, et al., Phys. Rev. Lett 83, 1303 (1999), Phys. Rev. Lett 84,
3775 (2000),
[2] C. Fransen, et al., Phys. Lett. 508B, 219 (2001).
Plenary Talk HK 1.2 Mon 13:45 P
Do nucleons that are bound in nuclei change their structure?
— •Steffen Strauch for the Jefferson Lab E93-049 collaboration —
The George Washington University, Washington DC
Polarization transfer in quasi-elastic nucleon knockout is sensitive to
the properties of the nucleon in the nuclear medium, including possible
modification of the nucleon form factor and/or spinor. Recent measurements
at both Mainz [1] and Jefferson Lab [2] of the proton recoil polarization
in the 4 He(�e, e ′ �p) 3 H reaction up to Q 2 = 2.6 (GeV/c) 2 will
be presented. The measured ratio of polarization-transfer coefficients
differs from a fully relativistic calculation, favoring the inclusion of a
medium modification of the proton form factors predicted by a quarkmeson
coupling model. In addition, the measured induced polarizations
agree reasonably well with the fully relativistic calculation, indicating
that the treatment of final-state interactions is under control. A recently
approved follow-up experiment at values of Q 2 of 0.8 (GeV/c) 2 and 1.3
(GeV/c) 2 with unprecedented precision will provide a stringent test of
the applicability of these calculations.
[1] S. Dieterich et al., Phys. Lett. B 500, 47 (2001)
[2] S. Strauch et al., Phys. Rev. Lett. 91, 052301 (2003)
HK 2 Nuclear Structure/Spectroscopy I
Plenary Talk HK 1.3 Mon 14:15 P
Isospin beaking in hadronic reactions — •Christoph Hanhart
— IKP-Theorie, Forschungszentrum Jülich, 52428 Jülich
In the standard model the isospin symmetry is borken by electro magnetic
interactions as well as the difference in the quark masses. Given
a systematic scheme that allowes to disentangle these two effects it is
possible to get direct access to quark mass ratios from low and medium
energy hadronic reactions. Recently interest in isospin breaking reactions
has revived due to the measurement of a forward–backward asymmetry
in pn → dπ 0 as well as the total cross section for dd → απ 0 —both
quantities vanish in an isospin symmetric world. After a brief introduction,
in my talk I will present the current status of the theoretical
analysis for these reactions. In particular a consistent and convergent
power counting scheme for pion production in nucleon–nucleon collisions
will be presented, that is mandatory for a model independent extraction
of the relevant low energy constants. In addition, I will briefly discuss
how the isospin violating a0(980) − f0(980) transition amplitude can be
studied in dd and pn induced production reactions—a quantity that is
believed to reveal important information on the nature of these lightest
scalar mesons.
Plenary Talk HK 1.4 Mon 14:45 P
Nucleon knockout reactions on 3 He induced by virtual photons
— •E. Jans — NIKHEF, Amsterdam
Nucleon knockout reactions induced by virtual photons reveal information
about the ground state wave function of the nucleus under study.
Predictions from theoretical models that account for final state interactions
(FSI), meson exchange currents (MEC) and isobar currents (IC)
are needed to interpret the data. Exclusive (e,e ′ p) cross sections measured
in the quasi-elastic scattering region are sensitive to the momentum
distribution of the proton in the initial state. With semi-exclusive
(e,e ′ p) experiments performed in the dip region, i.e., the energy-transfer
region between the peaks corresponding to quasi-elastic scattering and
∆-excitation, the knockout of correlated nucleon pairs can be investigated.
Two-nucleon knockout reactions became feasible with the completion
of high duty-factor electron facilities like AmPS (Amsterdam),
MAMI (Mainz) and JLab (Newport News, USA). Comparison of results
from (e,e ′ pp) and (e,e ′ pn) is needed to disentangle the interplay between
contributions from correlations in the initial state wave function generated
by the NN-interaction, MEC, IC and FSI. Various results of nucleon
knockout experiments on 3 He will be presented and compared to predictions
from state-of-the-art theoretical models like continuum Faddeev
calculations, which employ realistic NN-interactions. The dependence
of the 3 He(e,e ′ pN) cross sections on the missing momentum and on the
characteristics of the virtual photon will be discussed.
Time: Monday 15:45–18:45 Room: A
Group Report HK 2.1 Mon 15:45 A
Perspectives for Scattering Experiments with Relativistic Radioactive
Beams at the Future Super-FRS at GSI — •Thomas
Aumann for the R3B/NUSTAR collaboration — GSI, Darmstadt
A new generation of experiments with intense exotic nuclear beams
will be possible with the future facility at GSI [1]. This new accelerator
complex in combination with a large-acceptance super-conducting
fragment separator (Super-FRS) will provide beams of short-lived
nuclei with intensities that are several orders of magnitude higher than
presently available. Several experimental areas are planned which will
allow a broad experimental programme with rare isotopes at different
energies. In the present talk, the possibilities for reaction experiments
in complete kinematics at high energy (at about few hundred MeV/u)
will be discussed. Apart from the substantial intensity gain, new
opportunities for the study of rare isotopes will be gained due to
developments of new experimental techniques.
Supported by BMBF, GSI, and EU
[1] An International Accelerator Facility for Beams of Ions and
Antiprotons, Conceptual Design Report, Publisher GSI (2001),
http://www.gsi.de/GSI-Future/cdr/

Nuclear Physics Monday
Group Report HK 2.2 Mon 16:15 A
New results from direct mass measurements at GSI — •Yu.A.
Litvinov 1 , H. Geissel 1,2 , M. Matoˇs 1 , Yu.N. Novikov 3 , Z. Patyk 1 ,
T. Radon 1 , C. Scheidenberger 1 , F. Attallah 1 , K. Beckert 1 , P.
Beller 1 , F. Bosch 1 , D. Boutin 1 , T. Buervenich 4 , M. Falch 5 ,
T. Faestermann 6 , B. Franzke 1 , M. Hausmann 4 , E. Kaza 1 , T.
Kerscher 5 , O. Klepper 1 , H.-J. Kluge 1 , C. Kozhuharov 1 , K.-L.
Kratz 7 , S.A. Litvinov 1 , K.E.G. Löbner 5 , G. Münzenberg 1,7 , L.
Maier 6 , F. Nolden 1 , T. Ohtsubo 8 , A. Ostrowski 7 , A. Ozawa 9 , B.
Pfeiffer 7 , M. Portillo 1 , J. Stadlmann 1 , T. Suzuki 8 , M. Steck 1 ,
S. Typel 1 , D. Vieira 4 , H. Weick 1 , M. Winkler 1 , H. Wollnik 2 ,
and T. Yamaguchi 1 — 1 GSI Darmstadt — 2 JLU Giessen — 3 PNPI St.
Petersburg — 4 LANL Los Alamos — 5 LMU München — 6 TU München
— 7 JGU Mainz — 8 Niigata University — 9 RIKEN Saitama
A report will be given on the progress in direct mass measurements
with Isochronous (IMS) and Schottky (SMS) Mass Spectrometry at the
FRS-ESR. The mass surface of rather long-lived (T1/2 ≥ 1 s) neutrondeficient
nuclides, consisting of about 450 nuclei from Kr to At, was
measured with a precision of 30 keV by time-resolved SMS. Using known
decay energies, masses of 140 nuclides could be determined in addition.
114 masses were obtained for the first time. New masses of about 40
short-lived uranium fission fragments were measured by IMS with a precision
of about 250 keV. The measured data give the unique opportunity
to check and to improve modern mass models, to locate the proton and
two-proton drip-lines for heavy isotopes and moreover to perform investigations
of the isospin dependence of nuclear pairing energies.
Group Report HK 2.3 Mon 16:45 A
Absolute mass measurements of exotic nuclides at 10 −8 precision
with ISOLTRAP — •Klaus Blaum for the ISOLTRAP collaboration
— CERN, Division EP, 1211 Geneva 23, Switzerland — GSI,
Planckstraße 1, 64291 Darmstadt, Germany
ISOLTRAP is a Penning trap mass spectrometer installed at
ISOLDE/CERN for on-line mass measurements of short-lived radionuclides.
The precise determination of nuclear binding energies far from
stability includes nuclei that are produced at rates of 100 ions/s and
with half-lives well below 100 ms. The mass resolving power reaches 10 7
and the uncertainty of the resulting mass values has been pushed down
to 1 · 10 −8 [1,2].
A number of scientific highlights have been obtained recently, as e.g.
the mass measurement of 32 Ar (T1/2 = 98ms) and 74 Rb (T1/2 = 65ms).
Both provide important input for fundamental tests of the weak interaction,
for example with regards to the conserved vector current (CVC)
hypothesis and the unitarity of the Cabibbo-Kobayashi-Maskawa (CKM)
matrix. Furthermore, the high resolving power of ISOLTRAP allowed us
to prepare an isomerically pure ion beam. This opens a new field in nuclear
physics at low energies. In combination with the resonant ionization
laser ion source we were able to solve via high-precision mass measurements
the long-outstanding assignment puzzle between the ground state
and the two low-lying isomeric states in 70 Cu. The status of ISOLTRAP
as well as recent results will be presented.
[1] F. Herfurth et al., J. Phys. B 36 (2003) 931.
[2] K. Blaum et al., Nucl. Instrum. Methods 204 (2003) 478.
HK 2.4 Mon 17:15 A
Schottky mass measurements of neutron-rich nuclides between
lead and uranium — •E. Kaza 1 , F. Attallah 1 , K. Beckert 1 ,
P. Beller 1 , F. Bosch 1 , D. Boutin 1 , T. Faestermann 2 , B.
Franczak 1 , B. Franzke 1 , H. Geissel 1,3 , M. Hausmann 4 , M.
Hellstrvm 1 , O. Klepper 1 , H.-J. Kluge 1 , C. Kozhuharov 1 ,
K.-L. Kratz 5 , Yu.A. Litvinov 1 , L. Maier 2 , M. Matoˇs 1 , G.
M—nzenberg 1,5 , F. Nolden 1 , Yu.N. Novikov 6 , A.N. Ostrowski
5 , T. Ohtsubo 7 , A. Ozawa 8 , B. Pfeiffer 5 , M. Portillo 1 ,
C. Scheidenberger 1 , J. Stadlmann 1 , M. Steck 1 , T. Suzuki 7 ,
K. S—mmerer 1 , D. Vieira 4 , H. Weick 1 , M. Winkler 1 , H.
Wollnik 3 , and T. Yamaguchi 1 — 1 GSI Darmstadt — 2 TU M—nchen
— 3 JLU Giessen — 4 LNAL Los Alamos — 5 JGU Mainz — 6 PNPI
St.Petersburg — 7 Niigata University — 8 RIKEN Saitama
Relativistic heavy ions are produced from projectile fragmentation of a
672-690 MeV/u 238 U beam on a 4g/cm 2 Be target and separated according
to their magnetic rigidity in the fragment separator FRS. After being
injected into the experimental storage ring ESR, their velocity spread
is reduced by electron cooling. Thus the mass over charge ratio of the
ions becomes proportional to their revolution frequency which is acquired
with Schottky pick-ups.
Analysing the frequency spectra yields several previously unknown
masses of Th, Ac and Ra isotopes with typically 50 keV precision. Observing
the time evolution of the intensity of the isotopes allows their
halflife estimation, which also confirms their identification.
HK 2.5 Mon 17:30 A
Super-FRS, the Next-Generation Rare Isotope In-flight Facility
at GSI — •M. Winkler for the Super–FRS/NUSTAR collaboration
— GSI Darmstadt
The projectile fragment separator FRS at GSI has successfully contributed
to a broad scientific programme in heavy-ion physics and applications
at relativistic energies. The limitations of the present facility
are the relatively low intensities for primary beams and the low transmission
for rare isotope beams characterized by a large emittance, such
as fission fragments. The planned new international accelerator facility
at GSI [1] will solve these shortcomings. It will provide primary beams
of all projectiles up to uranium accelerated up to 2 GeV/u for nuclear
structure physics. The maximum intensities of these projectiles beams
will be (1-3)×10 12 /s depending on the energy, mass and charge state.
The planned new SUPERconducting projectile FRagment Separator [2],
Super-FRS, is a large acceptance in-flight facility providing spatially separated
rare-isotope beams for several experimental areas:
a) the high-energy branch including a high-resolution spectrometer to
perform reaction studies b) the low-energy branch for spectroscopy with
energy-bunched rare isotope beams c) the ring branch for precision experiments
with stored and cooled beams, including reactions with light
hadrons and electrons.
In this contribution we present the main characteristics of the Super-
FRS including the production target, degrader, and diagnostic systems.
[1] http://www.gsi.de/gsi-future/cdr/
[2] H. Geissel et al, Nucl. Instr. and Meth., B204(2003)71-85
HK 2.6 Mon 17:45 A
Half-life measurements of fully-ionized 207 Tl atoms — •D.
Boutin 1 , L. Maier 2 , T. Yamaguchi 1,3 , F. Bosch 1 , C. Scheidenberger
1 , K. Beckert 1 , P. Beller 1 , T. Faestermann 2 , B.
Franczak 1 , H. Geissel 1,4 , E. Kaza 1 , P. Kienle 2 , O. Klepper 1 , C.
Kozhuharov 1 , Yu.A. Litvinov 1 , M. Matos 1 , G. Münzenberg 1,5 ,
F. Nolden 1 , Yu.N. Novikov 6 , T. Ohtsubo 7 , W. Plass 4 , M. Portillo
1 , V. Shishkin 1 , J. Stadlmann 1 , M. Steck 1 , K. Takahashi 8 ,
H. Weick 1 , and M. Winkler 1 — 1 GSI Darmstadt — 2 TU München
— 3 Saitama University — 4 JLU Giessen — 5 JGU Mainz — 6 PNPI St
Peterburg — 7 Niigata University — 8 MPIK Heidelberg
For the understanding of the nucleosynthesis in stars, radioactive decays
play an important role. However in the stellar medium the extreme
temperatures and pressures lead to the stripping of most of the electrons
from the atoms, which can lead to a dramatic change in their β-decay
probabilities. In particular in highly-ionized atoms the bound-β − channel
opens up .
Half-life measurements of fully-ionized 207 Tl 81+ were performed with
time-resolved Schottky Mass Spectrometry (SMS) at the FRS-ESR facility
in GSI. The acceptance of the Experimental Storage Ring (ESR) allowed
to observe both the continuum-β − decay (to 207 Pb 82+ ) and boundβ
− decay (to 207 Pb 81+ ) of this nuclide, and consequently to evaluate the
partial half-lives and the branching ratios. The isomeric state of fullyionized
207 Tl (T1/2 = 1.33 s for the neutral atom) and its decay to the
ground state could be also observed. The experimental results will be
discussed and compared with theoretical predictions.
HK 2.7 Mon 18:00 A
Exotic nuclei from the Super-FRS studied in the storage rings
of the future international accelerator facility at GSI — •H.
Weick and H. Simon for the EXEL / NUSTAR collaboration — GSI,
Darmstadt
High intensity beams of rare isotopes will be produced, separated inflight
and injected into the new storage ring complex of the future international
accelerator facility at GSI. Precision mass and lifetime measurements
of exotic nuclei can be performed in the CR and NESR storage
rings. Very short-lived nuclei can be investigated without cooling in the
isochronous mode of the CR. Nuclear reactions with the internal target
in the NESR will be used to study the nuclear structure and the dynamic
properties of the stored rare isotopes. A main advantage of such investigations
in storage rings is the possibility to use thin targets without
losing luminosity which allows high resolution measurements and to look
at very low momentum transfer. A new field will be opened up by scattering
experiments of electrons on cooled exotic nuclei in the eA-collider.

Nuclear Physics Monday
HK 2.8 Mon 18:15 A
First results of the secondary-fragmentation technique within
the RISING project — •Frank Becker 1 , M.A. Bentley 2 , and G.
Hammond 2 for the RISING collaboration — 1 GSI Darmstadt, Planckstr.
1, Darmstadt, Germany — 2 School of Chemistry and Physics, Keele
University, Staffordshire, ST5 5BG, UK
The medium mass N=Z−3 nuclei provide information on the Coulomb
effects at a large proton excess as well as a rigorous test of the shell
model. In the first campaign of the new RISING project, nuclei in this
mass region were produced by secondary-fragmentation. A 58 Ni beam
at 600 MeV/A impinges on a 9 Be target at the entrance of the FRS
FRagment Separator at GSI. The FRS selects the fragments of interest,
in our case 55 Ni or 55 Co and guides them to the focal plane of the
spectrometer. There, the selected fragments reach a second 9 Be target
which is in the view of an array of EUROBALL CLUSTER detectors. In
this second target exotic nuclei are produced in a further fragmentation
step, inter alia the mirror pair 53 Mn/ 53 Ni. Gamma rays associated with
nuclei produced in the secondary reactions have been measured with the
CLUSTER detectors, and the nuclei themselves have been identified by
mass and charge in a new CAlorimeter TElescope (CATE). This device
is composed of a Si array followed by a CsI(Tl) scintillator array. The
latest results will be presented.
HK 3 Electromagnetic and Hadronic Probes I
HK 2.9 Mon 18:30 A
An RF ring electrode cooler for intense low-energy ion beams
— •S. Heinz 1 , D. Habs 1 , S. Hegewisch 1 , A. Nieminen 2 , and J. Szerypo
1 — 1 Ludwig-Maximilians-Universität München — 2 University of
Jyväskylä, Finland
The phase space cooling of low-energy ion beams can be performed by
frictional forces while the ions are interacting with the atoms of a buffer
gas. During the cooling process the ions have to be confined in transverse
direction by an oscillating electric field. A conventional method for ion
confinement is the application of Radio Frequency Quadrupoles (RFQ)
which generate a harmonic pseudo potential and operate in the typical
pressure range of 0.01 - 0.1 mbar.
We are investigating another concept for ion confinement where the
RFQ structure is replaced by a stack of Radio Frequency ring electrodes
with varying inner diameters (RF funnel). Other than with RFQs the
potential created by the RF funnel is box shaped. First experimental
investigations with beam currents up to 20 nA showed a very promising
transmission characteristics which revealed the applicability of the RF
funnel as high-current cooler.
Time: Monday 15:45–18:45 Room: B
Group Report HK 3.1 Mon 15:45 B
Recent results from light pionic atoms — •D. Gotta 1 , D.F.
Anagnostopoulos 2 , S. Biri 3 , G. Borchert 1 , J.-P. Egger 4 , H.
Fuhrmann 5 , A. Gruber 5 , M. Hennebach 1 , A. Hirtl 5 , P. Indelicato
6 , Y.-W. Liu 7 , B. Manil 6 , V.E. Markushin 7 , N. Nelms 8 , P.A.
Schmelzbach 7 , L.M. Simons 7 , M. Trassinelli 6 , A. Wells 8 , and
J. Zmeskal 5 — 1 IKP, FZ Jülich — 2 Dept. of Mat. Sc., Univ. Ioannina,
Greece — 3 Nucl. Res. Inst., Hung. Academy of Sc., Debrecen —
4 Univ. de Neuchâtel, Switzerland — 5 IMEP, Österr. Akademie d. Wiss.,
Vienna — 6 Lab. Kastler–Brossel, Univ. P. et M. Curie, Paris — 7 PSI,
Switzerland — 8 Dept. of Phys. and Astr., Univ. of Leicester, England
Recent results from pionic–atom measurements are a new precise determination
of the charged pion mass and of the hadronic effects in the
ground–state of pionic hydrogen. The new value for the pion mass results
from a simultaneous measurement of pionic nitrogen and muonic oxygen
X–rays, the precison of which is given by statistics and the knowledge
of the detector geometry. The experiment in pionic hydrogen profits
from a significantly improved peak–to–background ratio and statistics.
Moreover, three different transitions have been measured and the target
density was varied over a pressure range of 200. This served to disentangle
the effects of Coulomb de–excitation and constrain the hadronic
width to lower values than obtained from previous experiments.
Group Report HK 3.2 Mon 16:15 B
Measurement of σ(e + e − → π + π − ) with the KLOE detector —
•Stefan E. Müller for the KLOE collaboration — Institut für Exp.
Kernphysik Universität Karlsruhe, Postfach 3640, 76021 Karlsruhe
The KLOE detector at the DAΦNE φ-facility is in operation since 1999
and has accumulated ca. 500 pb −1 of data. The program of the KLOE
detector covers a wide spectrum of physics. Especially the measurement
of hadronic cross sections below an energy of 1 GeV receives much interest,
since the precise determination of these quantities helps to lower the
uncertainty on the theoretical evaluation of the hadronic contribution to
the muon anomalous magnetic moment.
The measurement at the φ-factory DAΦNE with its energy fixed to
the mass of the φ meson is carried out by selecting events in which the
e + or the e − emitts a photon in the initial state before colliding. This
”radiative return” to the ρ and ω resonances allows to scan the energy
region from the φ resonance down to the hadron production threshold.
The method of the measurement as well as results on σ(e + e − → π + π − )
based on data taken in 2001 will be presented in the talk. Special concern
will be given to the treatment of events with final state radiation.
Group Report HK 3.3 Mon 16:45 B
Real and virtual proton-proton bremsstrahlung — •M.
Mahjour-Shafiei 1 , H. Amir-Ahmadi 1 , J.C.S. Bacelar 1 , R.
Castelijns 1 , K. Ermisch 1 , E. van Garderen 1 , I. Gaˇsparic 2 ,
M.N. Harakeh 1 , N. Kalantar-Nayestanaki 1 , M. Kiˇs 1 , and H.
Löhner 1 — 1 Kernfysisch Versneller Instituut (KVI), Groningen, The
Netherlands — 2 Institut Rugjer Boˇsković, Zagreb, Croatia
The understanding of the strong force acting between nucleons is one
of the most fundamental problems addressed by nuclear physics. The
simplest reactions to study this force with, besides elastic scattering, is
proton-proton real and virtual bremsstrahlung.
Since the mid 90s, a series of experiments were setup at KVI to study
real and virtual proton-proton bremsstrahlung at 190 MeV in which the
kinematics are chosen such that one goes as far away as possible from the
elastic channel, thereby producing high energy photons. In continuation
of that work and in order to cover a much larger area of the available
phase space, a new setup employing the SALAD and the Plastic-Ball
detectors was used. In one of these experiments, much smaller photon
energies were measured, thus moving toward the elastic channel. Due
to the superiority of the Plastic-Ball in particle identification and more
phase-space coverage in comparison to the previous setup, a larger number
of ppe + e − events were taken. In this talk the details of the experiment
along with the results will be presented.
HK 3.4 Mon 17:15 B
A Systematic measurement of the proton-deuteron radiative
capture process — •A.A. Mehmandoost-Khajeh-dad 1,2 , H.
Amir-Ahmadi 2 , J.C.S. Bacelar 2 , A.M. van den Berg 2 , R.
Castelijns 2 , E. van Garderen 2 , M.N. Harakeh 2 , N. Kalantar-
Nayestanaki 2 , M. Kiˇs 2 , H. Löhner 2 , M. Mahjour-Shafiei 2 ,
J. Messchendorp 2 , B. Mukherjee 2 , S.V. Shende 2 , and H.J.
Wörtche 2 — 1 Mashad Ferdowsi university, Physics department,
Mashad, Iran — 2 Kernfysisch Versneller Instituut (KVI), Groningen,
The Netherlands
The study of radiative capture of a proton by a deuteron is of special
interest since it relevant for high-momentum components of the wave
functions involved in the transition. Furthermore, this process is sensitive
to meson-exchange currents and initial-state interactions.
Although,the radiative capture process has been studied in the past,
a systematic investigation of the differential cross section and analyzing
power as a function of center of mass energy covering a large angular
region is still missing. Recently, we performed an experiment at KVI in
which a polarized-deuteron beam, in a range of incident-beam energies
between 110 and 180 MeV, impinged on a liquid-hydrogen target. The
magnetic spectrometere, BBS, and the large plastic-scintillator sphere,
Plastic Ball, were used to determine the positions and energies of 3 He
and photon, respectively. In this contribution, the first results of the
measurements will be presented and discussed.

Nuclear Physics Monday
HK 3.5 Mon 17:30 B
Electrodisintegration of the deuteron in the ∆-region —
•Michael Schwamb and Hartmuth Arenhövel — Institut für
Kernphysik, Johannes Gutenberg-Universität, D-55099 Mainz, Germany
A recently developed model for photodisintegration of the deuteron[1]
has been extended to electrodisintegration. Our approach is based on a
nonrelativistic coupled-channel approach with nucleonic, mesonic and ∆degrees
of freedom and contains for the first time full retardation in the
potential and in the pionic meson-exchange currents. Moreover, hadronic
as well as electromagnetic offshell contributions are considered. Our results
show that retardation effects are significant above pion threshold,
in particular in the ∆-region.
[1] M. Schwamb and H. Arenhövel, Nucl. Phys. A 690, 647 (2001), Nucl.
Phys. A 690 682 (2001), Nucl. Phys. A 696 556 (2001)
HK 3.6 Mon 17:45 B
The NN-final-state interaction in two-nucleon knockout
reactions — •Michael Schwamb 1 , Sigfrido Boffi 2 , Carlotta
Giusti 2 , and Franco Davide Pacati 2 — 1 Institut für Kernphysik,
Johannes Gutenberg-Universität, D-55099 Mainz, Germany —
2 Dipartimento di Fisica Nucleare e Teorica dell’Università degli Studi di
Pavia, and INFN, Sezione di Pavia, I-27100 Pavia, Italy
The influence of the mutual interaction between the two outgoing nucleons
(NN-FSI) in electro- and photoinduced two-nucleon knockout from
16 O has been investigated perturbatively[1]. It turns out that the effect
of NN-FSI depends on the kinematics and on the type of reaction considered.
In superparallel kinematics NN-FSI leads in the (e, e ′ pp) channel
to a strong increase of the cross section, that is mainly due to a strong
enhancement of the ∆-current contribution. In pn-emission, however,
this effect is partially cancelled by a destructive interference with the
seagull current. For photoreactions NN-FSI is considerably reduced in
superparallel kinematics.
[1] M. Schwamb, S. Boffi, C. Giusti and F. D. Pacati, nucl-th/0307003
HK 3.7 Mon 18:00 B
High Resolution (γ,NN)-Experiments on 16 O — P. Grabmayr,
T. Hehl, J. Heim, •I. Martin, and F. Moschini for the A2 collaboration
— Physikalisches Institut der Universität Tübingen, Auf der
Morgenstelle 14, D-72076 Tübingen
Photoinduced two-nucleon knockout experiments are a promising tool
for the investigation of correlated nucleon pairs in nuclei. The present
experiments focus on the improvement of energy resolution for the final
states in order to increase the sensitivity when comparing with model
calculations. Due to the large level spacing of the residual A=14 nuclei
and the availability of complementary (e,e ′ NN) data, 16 O is a preferred
target. Thus, the reactions 16 O(γ,np) 14 N and 16 O(γ,pp) 14 C were investigated
at the tagged photon facility of the electron accelerator MAMI,
Mainz. In these measurements, the new HPGe array Ge6 from Edinburgh
was used in coincidence with the Tübingen time-of-flight neutron
spectrometer TOF for the first time. To improve the energy resolution of
the tagged photon beam, a microscope in the focal plane of the Glasgow
tagger was employed. A report on the experiment and the ongoing data
analysis is given, and first missing-energy spectra are presented.
This work is supported by the DFG (GRK 683 Basel-Tübingen and SPP 1034).
HK 4 Instrumentation and Applications I
HK 3.8 Mon 18:15 B
Single-Particle Structure of 7 He from the 7 Li(d, 2 He) Reaction*
— •N. Ryezayeva 1 , C. Bäumer 2 , A. van den Berg 3 , D. Frekers
2 , D. De Frenne 4 , P. Haefner 2 , E. Jacobs 4 , H. Johanson 5 ,
B. Jonson 6 , Y. Kalmykov 1 , A. Negret 4 , P. von Neumann-
Cosel 1 , L. Popescu 4 , S. Rakers 2 , A. Richter 1 , G. Schrieder 1 ,
A. Shevchenko 1 , H. Simon 5 , and H.J. Wörtche 3 for the EURO-
SUPERNOVA collaboration — 1 Institut für Kernphysik, Techische Universität
Darmstadt, Germany — 2 Institut für Kernphysik, Universität
Münster, Germany — 3 KVI Groningen, Netherlands — 4 Vakgroup Subatomaire
en Strahlingsfysica, Universiteit Gent, Belgium — 5 GSI Darmstadt,
Germany — 6 Chalmers University of Technology, Göteberg, Sweden
The spin-orbit interaction in neutron-rich nuclei is of much current interest
because of the disappearance of the usual magic numbers in such
nuclei. A recent GSI experiment [1] claims the observation of a low-lying
state at Ex ≈ 0.7 MeV assumed to be the p1/2 spin-orbit partner of the
7 He ground state. A study of the 7 Li(d, 2 He) 7 He reaction has been performed
at KVI searching for the allowed GT transition populating the
p3/2−p1/2 doublet. The unbound 2 He system was identified by measuring
coincidences between two protons with small relative energy. The setup
at KVI offers a resolution ∆E/E ≈100 keV, better than the line width
of the ground state of 7 He. Data were obtained at Ed = 171 MeV and
Θ2 He = 0 ◦ − 8 ◦ . First results will be presented.
[1] M. Meister et al., Phys. Rev. Lett. 88, 102501 (2002).
*Supported by the DFG under contract SFB 634.
HK 3.9 Mon 18:30 B
Isovector Spin-Flip Resonances in Medium-Mass and Heavy
Nuclei ⋆ — •Y. Kalmykov 1 , T. Adachi 2 , G.P.A. Berg 3 , H. Fujita
3 , Y. Fujita 2 , F. Hofmann 1 , P. von Neumann-Cosel 1 , V.Yu.
Ponomarev 1 , B. Reitz 1 , A. Richter 1 , A. Shevchenko 1 , Y. Shimbara
2 , and J. Wambach 1 for the EUROSUPERNOVA collaboration —
1 Institut für Kernphysik, Technische Universität Darmstadt, Germany —
2 Department of Physics, Osaka University, Japan — 3 Research Center
for Nuclear Physics, Osaka University, Japan
Recent progress in the understanding of isovector spin-flip resonances
is discussed. The reaction 90 Zr( 3 He,t) 90 Nb was studied at 0 ◦ with a 3 He
beam of energy E0 = 140 MeV/u. Highest energy resolution allows for
the first time to unravel the fine structure of GTR in a heavy nucleus. Recently
developed wavelet analysis techniques determine its characteristic
energy scales which provide unique insight into the damping of resonances
through internal mixing. The data also allow extraction of spin- and
parity-separated level densities by means of a fluctuation analysis. The
reaction 58 Ni(�p, �p ′ ) was investigated at incident energy of 172 MeV up
to 23 MeV and forward angles favoring the excitation of the spin-dipole
mode in the continuum. The results are compared to state-of-the-art
microscopic reaction calculations. The nuclear structure input, which
takes the coupling to complex configurations into account, allows for the
first time a satisfactory description of the spin-flip probabilities and cross
sections over a wide excitation energy and angle range.
⋆ Supported by the DFG under SFB 634 and 446 JAP 113/267/0-1.
Time: Monday 15:45–18:45 Room: C
Group Report HK 4.1 Mon 15:45 C
Calorimeter Telescope for identification of relativistic HI reaction
channels — •R. Lozeva 1,2 , S. Mandal 1 , and M. Gorska 1 for
the RISING collaboration — 1 GSI, Darmstadt, Germany — 2 Faculty of
Physics, University of Sofia ”St. Kl. Ohridski”, Sofia, Bulgaria
During a recent RISING [1] campaign at GSI, stable and radioactive
heavy-ion beams at relativistic energies between 100 MeV/u and 200
MeV/u have been used to perform fragmentation and Coulomb excitation
reactions on a secondary target. To distinguish the reaction channels, to
obtain information about the impact parameter and to identify the outgoing
projectiles, a newly developed CAlorimeter TElescope (CATE) [2]
system has been employed. CATE consists of a position sensitive Si
detector array with 9 elements for Z-identification and a corresponding
CsI(Tl) detector array for A-identification. The detectors cover a large
opening angle between 0 ◦ and 3 ◦ .
The CATE system has been used for the detection of heavy ions from
55 Ni up to 132 Xe, with instantaneous rates of up to ∼5x10 4 particles/s
and ion energies in the range 90 MeV/u and 150 MeV/u. Under
these conditions the detector system revealed an excellent Z resolution
∆Z∼1, a good position resolution (∆x,∆y)∼(5x5)mm and a mass resolution
after several corrections corresponding to Eresidual∼1% (FWHM).
[1] http://www-aix.gsi.de/ ∼ wolle/EB at GSI/rising.html
[2] http://www-linux.gsi.de/ ∼ lozeva/cate/cateweb.htm

Nuclear Physics Monday
HK 4.2 Mon 16:15 C
The AGATA γ-ray tracking detector module — •Dirk
Weißhaar for the AGATA collaboration — Institute for Nuclear
Physics, University of Köln
The Advanced GAmma Tracking Array AGATA will be the first
complete 4π γ-ray spectrometer built entirely from Germanium detectors.
Besides the good energy resolution, the AGATA Germanium detectors
are capable of resolving the position of each γ-interaction within a few
millimeters. This allows to track the scattering path of a γ-ray (Compton,
pair production and terminating photo effect) in order to decide
whether it was completly absorbed.
The development of the AGATA detectors is based on the technology
of the MINIBALL detectors [1, 2]. In AGATA three encapsulated, hexaconcical
Germanium crystals are closely packed in a common cryostat.
Each crystal is 36-fold segmented on the outer contact. The current
status of this detector development will be reported.
[1] D. Weißhaar, DPG-Verhandlungen 2001, HK26.2; 2002, HK7.6 und
2003, HK31.5
[2] J. Eberth et al., Prog. Part. Nucl. Phys. 46, 389 (2001)
gefördert durch das BMBF unter 06K167
HK 4.3 Mon 16:30 C
Time-of-Flight Mass Spectrometry for Ion-Catcher Facilities
— •W.R. Plaß 1 , S.A. Eliseev 1 , T. Dickel 1 , A.F. Dodonov 2 ,
H. Geissel 1,3 , D. Habs 4 , S. Heinz 4 , G. Münzenberg 3 , J. Neumayr
4 , Y.N. Novikov 5 , M. Petrick 1,3 , C. Scheidenberger 1,3 , P.
Thirolf 4 , and Z. Wang 1,3 for the SHIPTRAP collaboration and the
FRS-Ion-Catcher collaboration — 1 II. Physikalisches Institut, Justus-
Liebig-Universität Gießen — 2 BINEPCP, Russian Academy of Sciences,
Chernogalovka, Russia — 3 GSI, Darmstadt — 4 Sektion Physik der
LMU München, Garching — 5 St. Petersburg Nuclear Physics Institute,
Gatchina, Russia
A time-of-flight mass spectrometer system for identification and mass
measurement of exotic nuclei at ion-catcher facilities with gas-filled stopping
cells is discussed. The high resolution mass spectrometer system
will be operated at the SHIPTRAP and FRS-Ion-Catcher facilities at
GSI for performance characterization of the gas cells and for mass measurement
of fusion-reaction products and projectile / fission fragments,
respectively.
An overview of the current status of the system will be given, including
results from off-line tests with different ion sources and an on-line test
with primary Ar beam at the tandem accelerator in Garching, where the
mass spectrometer was coupled directly to the SHIPTRAP gas cell. It
will be shown that the system is now ready for direct mass measurement
of exotic nuclei. Also, a novel RFQ-based system for ion transport, manipulation
and distribution for use with the setup at the FRS-Ion-Catcher
facility will be described.
HK 4.4 Mon 16:45 C
Experimental results of the SHIPTRAP buffer gas cell ∗ —
•J.B. Neumayr 1 , D. Habs 1 , S. Heinz 1 , J. Szerypo 1 , P.G. Thirolf
1 , V. Varentsov 1 , F. Voit 1 , M. Block 2 , H.-J. Kluge 2 ,
M. Mukherjee 2 , W. Quint 2 , S. Rahaman 2 , D. Rodriguez 2 , G.
Sikler 2 , C. Weber 2 , S. Eliseev 3 , W. Plass 3 , and Z. Wang 3
— 1 Ludwig-Maximilians-Universität München — 2 GSI, Darmstadt —
3 Justus-Liebig-Universität Giessen
Stopping radioactive reaction products in a buffer gas cell and extracting
them via a supersonic gas jet into an RFQ structure is the first
and crucial element of the SHIPTRAP facility at GSI, designed for precission
mass measurements of transuranium elements. Results of the
experimental program for characterisation and optimisation of the gas
cell performance will be presented both from on- and off-line measurements
in Garching and at GSI. The stopping and extraction efficiency
was determined via the measurement of the α activity from 152 Er to 4-
8%. High-resolution mass-selective measurements were performed using
the Giessen Multi-TOF spectrometer. ∗ Supported by the BMBF and
Maier-Leibnitz-Laboratorium, Garching
HK 4.5 Mon 17:00 C
Online Results with LISOL Laser Ion Source — •Marius Facina
— Katholieke Universiteit Leuven,Instituut voor Kern -En Stralingfisika,Celestijnenlaan,200D,Heverlee,Belgium,3001
M. Facina, Yu. Kudryavtsev, P.Van den Bergh, J. Gentens, M.
Huyse,and P. Van Duppen
The application of a gas cell filled by noble gas (argon) for thermalizing,
storing and transporting trace radioactive ions and atoms has been
studied in on-line conditions. Radioactive ions produced in nuclear reactions
and stable energetic ions from a cyclotron have been resonantly
re-ionized by laser light via a two-step resonant process after thermalization
in high-pressure noble gas. Results for the laser ion source efficiencies
for conversion of a high energetic stable ion beam into a low energetic
beam are given.
HK 4.6 Mon 17:15 C
Prompt Gamma-Ray Activation Analysis: latest results from
PSI and future projects for the FRM-II in Munich — •Petra
Kudějová 1 , Sébastien Baechler 2 , Jan Jolie 1 , and Thomas Materna
1 — 1 Institut für Kernphysik, Universität zu Köln, D-50937 Köln,
Germany — 2 Institut Universitaire de Radiophysique Appliquee, Grand-
Prè 1, CH-1007 Lausanne, Switzerland
At the beginning of the year 2004, the Prompt Gamma-Ray Activation
Analysis (PGAA) installation, which successfully ran at the Paul Scherrer
Institute (PSI), Switzerland, will be mounted and operated at the new
Munich research reactor FRM-II, Germany. This new set-up will keep its
advantages from experience gained at PSI and in addition will profit from
better conditions at the FRM-II and from new improvements. A set of
archaeological, geological or other kind of samples can be measured using
the automatized measuring system developed for PGA at PSI. With the
use of neutron focusing lens, position sensitive PGA can be performed.
Example of analysis of 54 roman brooches is presented. A new project in
cooperation with cosmochemists concerning systematization in elemental
composition of meteorites is discussed.
HK 4.7 Mon 17:30 C
The radiofrequency cooler and buncher for the TRIµP facility
— •E. Traykov, L. Huisman, A. Rogachevskiy, M. Sanchez-
Vega, E. Traykov, L. Willmann, H. Wilschut, and K. Jungmann
— Kernfysisch Versneller Instituut, Rijksuniversiteit Groningen,
Netherlands
For the new facility TRIµP at the Kernfysisch Versneller Instituut
(KVI) in Groningen a radiofrequency quadrupole cooling and bunching
system has been developed. The system was designed to accept low
charged ions from radioactive isotopes in the several 10 eV range from
a magnetic separator device after they have been pre-cooled in collisions
with matter. The radiofrequency quadrupole provides radial focussing
and low pressure gas allows further cooling for ions. At its end the device
has an electrodynamic potential minimum to collect the particles.
Through appropriate switching of dc voltages a bunched beam can be
extracted. A novel DC and AC voltage coupling scheme for such devices
will be discussed.
HK 4.8 Mon 17:45 C
THE CURRENT STATUS OF THE TRIµP SEPARATOR —
•G.P.A. Berg, 0. Dermois, K. Kiewiet, H.H. Traykov, H.W.
Wilschut, and K. Jungmann — Kernfysisch Versneller Instituut,
Rijksuniversiteit Groningen, Netherlands
The TRIµP separator is the first part of the TRImP facility at KVI, the
purpose of which is to separate specific rare isotopes that will be produced
using the cyclotron AGOR via fragmentation and fusion evaporation reactions
at energies of 8 - 70 MeV/nucleon. In particular rare isotopes
that are needed for high precision studies to search for physics beyond the
standard model are of interest. The separator is an achromatic system
consisting of two magnetic dipole doublets and four quadrupole doublets.
At the intermediate, dispersive focal plane a slit system will be
used to separate beam and reaction products according to their magnetic
rigidities. Further separation is possible in the second section using the
energy loss method by using wedge type degraders. The system is designed
to operate not only in this ”fragmentation mode”, but also in the
”gas-filled recoil mode” to allow efficient collection of heavy isotopes with
large charge state distributions. The magnet system is presently being
fabricated by Danfysik and Sigma Phi. Installation at KVI will start at
the end of this year. We will present the concept, layout and present
status of the project.

Nuclear Physics Monday
HK 4.9 Mon 18:00 C
Experimental Investigations of Advanced Cold Moderators and
Comparison with MCNPX Simulations — •K. Nuenighoff for
the JESSICA collaboration — Forschungszentrum Jülich GmbH, 52425
Jülich
The aim of the JESSICA experiment at the Jülich proton accelerator
COSY is the investigation of the characteristics of advanced cold moderators
for spallation neutron sources. In this contribution we will present
the neutron energy spectra for methane hydrate and mesitylene and discuss
the advantages and disadvantages of both materials. We will furhter
show first comparisons of the measured energy spectra of an ice moderator
at different temperatures with Monte-Carlo simulations performed
with MCNPX applying new developed neutron scattering kernels. Further
we will show the wavelength dependent time-of-flight spectra for
selected materials, like ice, methane-hydrate, and mesitylene.
HK 4.10 Mon 18:15 C
Determination of RBE of low-energy X-rays at ELBE — •Anna
Panteleeva 1 , Wolfgang Enghardt 1 , Elisabeth Lessmann 1 ,
Jörg Pawelke 1 , Wolfgang Wagner 1 , and Wolfgang Dörr 2 —
1 Forschungszentrum Rossendorf — 2 Technical University of Dresden
The precise determination of the relative biological effectiveness (RBE)
of low-energy X-rays is important because of their wide application in diagnostic
radiology (particularly mammography) and radiotherapy (e. g.
brachytherapy). The RBE of both 10 kV and 25 kV X-rays relative to 200
kV X-rays by X-ray tube irradiation was found to be in the range from 1.0
to 1.4, depending on the used radiation quality, cell line and the biological
endpoint. In order to study in detail the RBE dependence on photon
energy, the investigations will be continued at a monochromatic X-ray
source. The installation of an intensive, tunable, quasi-monochromatic
source in the energy range 10 - 100 keV is currently under progress at
HK 5 Theory I
the ELBE accelerator at Forschungszentrum Rossendorf. X-rays are produced
by channeling of a relativistic electron beam in a diamond crystal.
The status of the commissioning of the radiation source will be presented,
such as the experimental verification of the theoretical calculation of the
spatial energy and intensity distribution. Furthermore, a monochromator,
designed to minimize the contribution of the background radiation
to the dose in the cell target, will be presented.
HK 4.11 Mon 18:30 C
Upgrade of the 30 ◦ forward cone of the Crystal-Barrel-Detector
— •Christian Funke for the CBELSA collaboration — Helmholtz-
Institut für Strahlen- und Kernphysik der RFWU Bonn, 53115 Bonn
The Crystal-Barrel experiment at ELSA is used to investigate the
structure of hadrons by electromagnetic probes. The 4π-geometry of this
electromagnetic calorimeter especially predestines this experiment for the
research on multi-photon final states. Due to it’s setup as a ”fixed target”
experiment an efficient trigger for particles (photons and protons
in our case) and their energy determination under small forward angles
is a subject of great importance. The TAPS detector covering the 30 ◦
forward angle provided this functionality until December 2003. To maintain
this ability a new forward-detector based on the 90 CsI-(Tl) crystals
of the original Crystal-Barrel configuration is under development. The
existing photodiode based readout is replaced by fast photomultipliers
and matching back-end electronics. Additionally the front of the crystals
facing the reaction target will be outfitted with 2 additional layers of
plastic-scintillators which allow to trigger on and separate charged particles.
In order to provide (pre-)trigger signals for the data acquisition
system a fast SRAM-based cluster-finder-logic is being developed. This
talk summarizes the current status and capabilities of this new forwarddetector.
This project is supported by the DFG.
Time: Monday 15:45–18:45 Room: D
Group Report HK 5.1 Mon 15:45 D
Novel approach to nuclear forces from effective field theory —
•Ulf-G. Meißner 1,2 , Evgeny Epelbaum 3 , and Walter Glöckle 4
— 1 HISKP (Th), Universität Bonn, Bonn, Germany — 2 IKP (Th), FZ
Jülich, Jülich, Germany — 3 Jefferson Lab, TH Div, Newport News, USA
— 4 RUB, TP II, Bochum, Germany
We report on a new formulation to calculate the forces between two,
three, . . . nucleon from chiral effective field theory. We have developed
a cut-off scheme for pion loop integrals, in particular the two-pion exchange,
based on spectral function regularization [1]. This scheme allows
for a consistent implementation of the constraints from pion-nucleon scattering.
It leads to a much improved description of the partial waves with
l ≥ 2 compared to the calculation utilizing dimensional regularization.
We have also studied the low partial waves and deuteron properties at
next-to-leading order [2] and find an overall good description of the twonucleon
force. We also show that the numerical values of the coupling
constants of the four-nucleon contact operators, that are determined from
a fit to the low partial waves, can be understood in terms of resonance
saturation. This allows for a connection with more conventional boson
exchange phenomenology. At this meeting, we present results for the
partial waves and deuteron properties obtained at N 3 LO [3], which are
of the same precision as one obtains when employing the so–called high
precision potentials.
[1] E. Epelbaum et al., arXiv:nucl-th/0304037, Eur. Phys. J. A, in print
[2] E. Epelbaum et al., arXiv:nucl-th/0308010, Eur. Phys. J. A, in print
[3] E. Epelbaum, W. Glöckle and U.-G. Meißner, in preparation
HK 5.2 Mon 16:15 D
Can the D∗ sJ(2317) be explained as a DK molecule? — •Felix
Sassen — IKP Theorie Forschungzentrum-Jülich, 52425 Jülich
Applying the Blankenbecler Sugar scattering equation in the case of
coupled DK- and D + s
π-channels we find that a dynamically generated
pole arises close to 2317 MeV, when we assume SU(4)-symmetry to relate
the coupling parameters to the well known coupling parameters in
the case of ππ-K ¯ K scattering. Our model relates in a natural way the
contributions of D + s π scattering originating from this pole to the contributions
from the opening iso vector DK-channel, if we assume that
isospin breaking only happens via the mass differences and ρω- as well as
πη-mixing. We use the constrains coming from the BaBar, Cleo and Belle
observations of the D ∗ sJ(2317) to give an estimate for the non molecular
iso scalar contribution to the observed state.
HK 5.3 Mon 16:30 D
Glueball mixing in an effective field theoretical approach —
•Francesco Giacosa, Thomas Gutsche, Valery Lyubovitskij,
and Amand Faessler — Institut fuer Theoretische Physik, Auf der
Morgenstelle 14, Geb. D, 72076 Tuebingen
The search and the identification of the glueball is an open problem
both from experimental and theoretical point of view. It is believed that
the pure glueball mixes with its ”neigbouhrs”, scalar quark-antiquark
states, giving rise to three resonances: f0(1310), f0(1500) and f0(1710);
each of them is formed by gluon-gluon and quark-antiquark. The system
is analyzed within an effective field theoretical approach in order to find
the relation between the masses ”before” the mixing and those ”after”
the mixing (which are the masses of the physicl states); also the composition
of the resonances in terms of their gluon-gluon and quark-antiquark
admixtures is evaluated. The goal is the calculation of the strong and
the radiative deays of the physical resonances.
HK 5.4 Mon 16:45 D
Three-body spin-orbit forces from chiral two-pion exchange —
•Norbert Kaiser — Physik Department T39, Technische Universität
München, D-85747 Garching, Germany
Using chiral perturbation theory, we calculate the density-dependent
spin-orbit coupling generated by the two-pion exchange three-nucleon interaction
involving virtual ∆-isobar excitation. From the corresponding
three-loop Hartree and Fock diagrams we obtain an isoscalar spin-orbit
strength Fso(kf) which amounts at nuclear matter saturation density to
about half of the empirical value of 90 MeVfm 5 . The associated isovector
spin-orbit strength Gso(kf) comes out about a factor of 20 smaller. Interestingly,
this three-body spin-orbit coupling is not a relativistic effect but
independent of the nucleon mass M. Furthermore, we calculate the threebody
spin-orbit coupling generated by two-pion exchange on the basis of
the most general chiral ππNN-contact interaction. We find similar (numerical)
results for the isoscalar and isovector spin-orbit strengths Fso(kf)

Nuclear Physics Monday
and Gso(kf) with a strong dominance of the p-wave part of the ππNNcontact
interaction and the Hartree contribution. We consider also the
effect of iterated pion-photon exchange on the Coulomb energy of nuclei.
It leads to an additional binding of each proton by about 0.2MeV. We
propose as a mechanism to resolve the Nolen-Schiffer anomaly the iteration
of one-photon exchange with a short-range pp-interaction. The corresponding
energy per proton reads: Ē[ρp] = (2/15π 2 )(π 2 −3+6 ln2)App k 2 p
with ρp = k 3 p /3π2 the proton density.
N. Kaiser, Phys. Rev. C68 (2003) 054001.
Work supported in part by BMBF, GSI and DFG.
HK 5.5 Mon 17:00 D
Chiral Perturbation Theory for Heavy Nuclei — •Akaki Rusetsky
1 , Luca Girlanda 2 , and Wolfram Weise 2,3 — 1 HISKP (Th),
Universität Bonn, Bonn, Germany — 2 ECT*, Trento, Italy — 3 Physik-
Department, TU München, Garching, Germany
We propose a novel formulation of Chiral Perturbation Theory in a
nuclear background, characterized by a static, non-uniform distribution
of the baryon number that describes the finite nucleus[1]. The proposed
approach is directly applicable to study of the deeply bound (1s) states of
pionic atoms formed with Pb and Sn isotopes, whose spectrum has been
measured at GSI[2]. The results of this high-precision experiment have
recently triggered a discussion about the possibility of observation of the
“fingerprints of chiral restoration” in nuclear medium. This issue, however,
can only be resolved, provided a systematic theoretical framework
is available for the description of pionic atoms within Chiral Perturbation
Theory, taking into account the effects of the finite nuclear size. The
proposed approach intends to fill this gap. In addition, it opens perspectives
for many applications of ChPT in nuclear physics – especially for
the problems in which the finite boundaries of the system are crucial.
In the limiting case of a uniform distribution, the proposed framework[1]
reduces to the well-known zero-temperature in-medium ChPT.
We further use the approach to calculate the self-energy of the charged
pion in the background of the heavy nucleus at O(p 5 ) in the chiral expansion,
and to derive the leading terms of the pion-nucleus optical potential.
[1] L. Girlanda, A. Rusetsky and W. Weise, arXiv:hep-ph/0311128.
[2] K. Suzuki et al., arXiv:nucl-ex/0211023.
HK 5.6 Mon 17:15 D
Separating long- and short-distance physics in chiral effective
field theory — •T.R. Hemmert 1 , V. Bernard 2 , and U.-G.
Meißner 3 — 1 Physik Department T39, TU München — 2 LPT, U. Louis
Pasteur, Strasbourg — 3 HISKP (Th), U. Bonn
We discuss the use of cutoff regularization methods in chiral perturbation
theory [1]. We develop a cutoff scheme based on the operator
structure of the chiral effective field theory that allows to suppress
high momentum contributions in Goldstone boson loop integrals and—
by construction—is free of the problems traditional cutoff schemes have
with gauge invariance or chiral symmetries. In this scheme momentum
modes above the scale of chiral symmetry breaking are effectively transfered
into local operators of the effective theory parameterizing short
distance physics. As examples we discuss the quark mass dependence of
the nucleon mass and of the polarizabilities of the nucleon [2].
[1] V.Bernard, T.R. Hemmert and U.-G. Meißner, [hep-ph/0307115].
[2] T.R. Hemmert and B.R. Holstein, forthcoming.
This work has been supported in part by BMBF and DFG.
HK 5.7 Mon 17:30 D
Low energy double-pion photoproduction and pion absorption
in nuclei — •Luis Alvarez-Ruso, Oliver Buss, Ulrich Mosel,
and Pascal Mühlich — Institut für Theoretische Physik, Universität
Giessen, 35392 Giessen, Germany
We investigate π 0 π 0 and π ± π 0 photoproduction off nuclei at incident
beam energies of 400-460 MeV. For the pion-pair production on the nucleons
we use a theoretical model developed in Valencia (Nacher et al.).
A full coupled-channel treatment of final state interactions is performed
by means of the semi-classical BUU transport model. We observe that
quasi-elastic and charge-exchange scatterings of the final state pions with
the nucleons of the surrounding medium cause a downward shift of the ππ
invariant mass distributions. In the π 0 π 0 channel, our results agree well
with the data on 12 C and 208 Pb obtained recently at MAMI-B without
introducing any additional in-medium modification. In the π ± π 0 channel,
however, we overestimate the total cross-section. Furthermore, we
study the role of the real part of the pion optical potential in the pion
propagation inside nuclei within our semi-classical model. The aim is
to describe simultaneously low-energy pion absorption and double-pion
photoproduction in nuclei.
Work supported by the Humboldt foundation and the European graduate
school Giessen–Copenhagen.
HK 5.8 Mon 17:45 D
Ground-state energy of pionic hydrogen to one loop — •E. Lipartia
1 , J. Gasser 2 , M.A. Ivanov 3 , M. Mojzis 4 , and A. Rusetsky 5
— 1 Institute for Theoretical Physics (T39), TU München, Germany —
2 ITP, Univesity of Bern, Bern Switzerland — 3 BLTP, JINR, Dubna, Russia
— 4 Departmet of Physics, Univesity of Massachusetts, Amherst, USA
— 5 HISKP, Bonn Univesity, Bonn, Germany
We investigate the ground-state energy of the π − N atom (pionic hydrogen)
in the framework of QCD and QED. In particular, we evaluate
the strong energy-level shift. We perform the calculation at next-toleading
order in the low-energy expansion in the framework of infrared
regularized effective field theory. The result provides a relation between
the strong energy shift and the pion-nucleon S-wave scattering lengths -
evaluated in pure QCD - at next-to-leading order in isospin breaking and
in the low-energy expansion. We compare our result with available model
calculations. Work supported by Swiss National Science Foundation.
[1] J. Gasser, M.A. Ivanov, E. Lipartia, M. Mojzis, A. Rusetsky,
Eur.Phys.J.C26:13-34,2002.
HK 5.9 Mon 18:00 D
Quantum Chaos in Baryon Spectra — •Harald Markum 1 ,
Willibald Plessas 2 , Rainer Pullirsch 1 , Bianka Sengl 2 , and
Robert F. Wagenbrunn 2 — 1 Atominstitut, TU Wien — 2 Inst. f.
Theoretische Physik, Univ. Graz
The Bohigas-Giannoni-Schmit conjecture for quantum chaos is formulated
and evaluated within random-matrix theory. We discuss randommatrix
theory as a tool to study the spectral behaviour of an analytically
solvable Hamiltonian, of a model Hamiltonian, and of experimental data.
As a particular case we consider the spectroscopy of baryons. Within the
framework of a relativistic constituent quark model we investigate the
excitation spectra of the nucleon and the delta with regard to a possible
chaotic behaviour for the cases when a hyperfine interaction of either
Goldstone-boson-exchange or one-gluon-exchange type is added to the
confinement interaction.
HK 5.10 Mon 18:15 D
The nuclear many-body problem in the context of low-energy
QCD — •Paolo Finelli 1,2 , Norbert Kaiser 3 , Dario Vretenar
4 , and Wolfram Weise 2,3 — 1 Physics Department, University of
Bologna, Italy — 2 ECT*, Villazzano (Trento), Italy — 3 Physik Department,
Technische Universität München — 4 Physics Department, University
of Zagreb
A microscopic relativistic point-coupling model of nuclear many-body
dynamics constrained by in-medium QCD sum rules and chiral symmetry
is derived and applied to nuclear matter and finite nuclei.
The effective Lagrangian is characterized by density-dependent coupling
strengths, determined by chiral one- and two-pion exchange and
by QCD sum rule constraints for the large isoscalar nucleon self-energies
that arise through changes of the quark condensate and the quark density
at finite baryon density. This approach is tested in the analysis
of the equations of state for symmetric and asymmetric nuclear matter,
and of bulk and single-nucleon properties of finite nuclei. In comparison
with purely phenomenological mean-field approaches, the built-in QCD
constraints and the explicit treatment of pion exchange restrict the freedom
in adjusting parameters and functional forms of density dependent
couplings.
It is shown that nuclear binding and saturation are almost completely
generated by chiral (two-pion exchange) fluctuations, whereas strong
scalar and vector fields of about equal magnitude and opposite sign, induced
by changes of the QCD vacuum in the presence of baryonic matter,
generate the large effective spin-orbit potential in finite nuclei.
HK 5.11 Mon 18:30 D
Analysis of baryon masses to second order in the quark masses
— •Matthias Frink and Ulf-G. Meißner — IKP, FZ Jülich, Jülich,
Germany and HISKP (Th), Universität Bonn, Bonn, Germany
We analyse the masses of the ground state baryon octet to second order
in the quark masses in the framework of a lorentz-invariant formulation of
baryon chiral perturbation theory. We also include strong isospin break-

Nuclear Physics Monday
ing, thus extending earlier work [1]. We present compact formulae that
can be used for the chiral extrapolation of lattice simulations, that usually
work at higher quark (meson) masses [2]. As a by-product, we also
construct the complete fourth order meson-baryon Lagrangian for three
HK 6 Theory II
flavors with all possibel external sources.
[1] B. Borasoy and U.-G. Meißner, Ann. Phys. 254 (1997 )192-232
[2] M. Frink and U.-G. Meißner, in preparation
Time: Monday 15:45–18:45 Room: E
Group Report HK 6.1 Mon 15:45 E
Fermi-liquid theory of quark matter at high densities — •Kai
Hebeler and Bengt Friman — Gesellschaft für Schwerionenforschung,
64291 Darmstadt, Planckstr. 1
We explore the Fermi-liquid properties of ultrarelavistic electron and
quark systems at zero temperature and high baryon densities. Contributions
to the effective interaction due to the polarisation of the medium
are computed in the random-phase-approximation. As is well known, the
lack of screening for transverse gauge bosons implies that the quasiparticle
strength vanishes for states at the Fermi surface, and consequently
that such a system formally is not a normal Fermi liquid. However, since
the corresponding singularity is logarithmic, the normal Fermi-liquid behaviour
is restored at minimal temperatures. The corresponding Fermiliquid
parameters, including spin, flavour and colour degrees of freedom
are presented. An appropriately modified Fermi-liquid approach could be
relevant for the description of a possible colour-superconducting phase.
Group Report HK 6.2 Mon 16:15 E
Point-Form Dynamics of Relativistic Few-Body Sytems —
•Wolfgang Schweiger 1 , Marcus Lechner 1 , William H.
Klink 2 , and Andreas Krassnigg 3 — 1 Inst. Theor. Physik, Univ.
Graz, Graz, Austria — 2 Dept. Physics and Astr., Univ. of Iowa, Iowa
City, USA — 3 Argonne National Lab., Argonne, USA
The general problem of formulating relativistic quantum mechanics for
a fixed number of particles goes back to the pioneering work of Dirac in
which he suggested three different forms of relativistic dynamics, i.e. the
instant form, the front form, and the point form. These forms differ by
the set of Poincarè generators which are interaction dependent. Although
it has a number of advantages, the point form has been the least used and
is the most unfamiliar of the three forms. Our contribution deals with
a point-form formulation of relativistic few-body systems. We present a
relativistic, Poincarè invariant coupled-channel formalism for few-body
systems interacting via one-particle exchange. Our approach takes the
exchange particle explicitly into account and relates the coupling of the
exchange particle to an underlying quantum field theory. As illustrative
examples we will present vector mesons within the chiral constituent
quark model and electromagnetically bound systems like hydrogen and
positronium. The vector-meson system allows us to study the effect of
retardation in the Goldstone-boson exchange. The investigation of hydrogen
and positronium serves as a test of the point-form approach for
well studied QED systems and reveals the relation between point-form
and instant-form dynamics.
HK 6.3 Mon 16:45 E
Particle production in space-time dependent fields — •Dennis
Dietrich — Laboratoire de Physique Théorique, Bâtiment 210, Université
Paris XI, 91405 Orsay Cedex, France
The exact retarded propagators of particles in classical space-time dependent
gauge fields is derived by solving the equations of motion for
the Green’s functions with corresponding boundary conditions. From
the retarded propagators obtained in this way, the momentum spectrum
for pairs produced by vacuum polarisation is calculated. Different approximations
and the exact solution for the Green’s functions and the
momentum spectra are presented.
HK 6.4 Mon 17:00 E
Fermionic Casimir Effect: Cavities Interact in the Fermi Sea
— •Andreas Wirzba 1 and Aurel Bulgac 2 — 1 Universität Bonn,
HISKP(Theorie), Nussallee 14-16, 53115 Bonn — 2 Department of
Physics, University of Washington, Seattle WA 98195-1560, USA
We report about a new force that acts on cavities (literally empty
regions of space) when they are immersed in a background of noninteracting
fermionic matter fields. The interaction follows from the
obstructions to the (quantum mechanical) motions of the fermions in
the Fermi sea caused by the presence of bubbles or other (heavy) particles
immersed in the latter, as e.g. nuclei in the neutron sea in the crust
of a neutron star.
This effect resembles the traditional Casimir effect which describes
the attraction between two parallel metallic mirrors in vacuum. Here,
however, the fluctuating (bosonic) electromagnetic fields are replaced by
real fermionic fields, the Casimir energy is inferred from the geometrydependent
part of the density of states, and its sign is not fixed, but varies
according to the relative arrangement and distances of the cavities.
This topic is relevant to the physics of neutron star crusts (nuclei embedded
in a neutron gas), to inhomogeneous phases in the quark-gluon
plasma, to dilute Bose-Einstein-condensate bubbles inside the background
of a Fermi-Dirac condensate, to buckyballs in liquid mercury,
to superconducting droplets in a Fermi liquid, etc.
This work is supported under Contract 41445400 (COSY-067) of the
Forschungszentrum Jülich GmbH.
HK 6.5 Mon 17:15 E
Semileptonic Decays of Baryons in a Covariant Quark
Model — •Sascha Migura, Dirk Merten, Bernard Metsch,
and Herbert-R. Petry — Helmholtz-Institut für Strahlen- und
Kernphyik, Abteilung Theorie, Nußallee 14-16, D-53115 Bonn
We are calculating semileptonic decays of baryons in a relativistic covariant
constituent-quark model which is based on the Bethe-Salpeterequation
in instantaneous approximation. This model generates mass
spectra for mesons and baryons up to the highest observable energies.
Without introducing additional free parameters we compute on this
basis helicity amplitudes of semileptonic decays. We thus obtain decay
widths for semileptonic decays in good agreement with experiment.
HK 6.6 Mon 17:30 E
Static properties of baryons in the Bethe-Salpter framework
— •Christian Haupt, Ulrich Löring, Bernard Metsch, and
Herbert-R. Petry — Helmholtz-Institut für Strahlen- und Kernphysik,
Abteilung Theorie, Nußallee 14-16, D-53115 Bonn
We derive a method, to compute static properties (e. g. magnetic
moments and charge radii) of baryons from the Bethe-Salpeter equation
in the instantaneous approximation. This is usually done by taking the
limit of some form factor. We develop instead a new approach, which expresses
the static moments as expectation values of appropriate operators
with respect to Salpeter amplitudes.
We discuss the analytic derivation of these expecation values, show the
numerical results and compare them to experiment.
HK 6.7 Mon 17:45 E
Hyperon-nucleon Dirac-Brueckner calculations — •Christoph
Keil and Horst Lenske — Institut für Theoretische Physik, Universität
Giessen, 35392 Giessen, Germany
We present a model for the calculation of relativistic effective inmedium
interactions for NN and YN scattering. The model is based on
the covariant meson exchange formalism of the Bonn potentials which
are extended to also include the octet hyperons as well as the lowest
three meson octets, accounting for pseudoscalar, vector and scalar interactions.
The decomposition of the G-matrix, for which we have to use
an enlarged set of invariants, is discussed. For the decomposition also
the half off-shell amplitudes are utilized which removes the ambiguities
in this process. We will present first results for the application of our effective
Λ-N interaction to single Λ hypernuclei calculated in the density
dependent relativistic hadron field theory DDRH.
Work supported by the European graduate school Giessen–Copenhagen.

Nuclear Physics Monday
HK 6.8 Mon 18:00 E
Nuclear structure of light nuclei in an extended FMD approach
— •Thomas Neff 1 , Hans Feldmeier 1 , and Robert Roth 2
— 1 Gesellschaft für Schwerionenforschung, Darmstadt — 2 Institut für
Kernphysik, TU Darmstadt
The internal structure of light nuclei up to the drip lines is studied
using FMD many-body states. The calculations make no a priori assumptions
about a core or single particle-states and energies. The same
correlated two-body interaction is used for all nulei. Continuum effects
are included.
Energies, mass and charge radii, as well as electromagnetic transitions
are calculated without using effective charges. The FMD representation
provides not only a very intuitive and descriptive picture but also quantitative
predictions.
Both, variaton after projection on total angular-momentum eigenstates
and configuration mixing are important to understand the changes in
structure with increasing neutron number. For example, the binding energies
and radii near the driplines can only be reproduced when the halo
neutrons are swaying collectively against the rest of the nucleus. Intrinsic
clusterization is essential for a quantitative description of low lying states
(e.g. C, Ne isotopes).
HK 6.9 Mon 18:15 E
Photons and the Triton at Very Low Energies — •Harald
W. Griesshammer — Institut für Theoretische Physik (T39), TU
München, Germany
Recently, the Effective Field Theory of the three-nucleon system in
which pions are integrated out as heavy was systematised to all orders
in the low-energy expansion [1]. In this consistent and modelindependent
approach, calculations involving external electro-weak currents
can be performed straightforwardly, and the theoretical error can
be estimated systematically. They are relevant e.g. for big-bang nucleosynthesis
and the extraction of neutron properties from experiments on
HK 7 Heavy Ions I
light nuclei. Often, three-body forces are irrelevant, but in the doublet-
S-wave (triton/ 3 He) channel, three-body forces are stronger than naïvely
expected. Using the requirement that physical low-energy observables
are insensitive to details of the short distance treatment, two simple observables
like the triton binding energy and scattering length suffice to
determine the three-body forces for wave functions accurate to ∼ 1%.
We present a calculation of the triton and 3 He form factors and an investigation
into charge symmetry breaking in the triton/ 3 He-system. Our
result for triton photo-disintegration resolves a 15% discrepancy between
potential-model calculations and the measured total cross section at thermal
neutron energies [2].
Work supported in part by DFG and BMBF.
[1.] Bedaque, Grießhammer, Hammer and Rupak: Nucl. Phys.A714
(2003), 589 [nucl-th/0207034].
[2.] Bedaque, Grießhammer, Hammer and Rupak: in preparation.
HK 6.10 Mon 18:30 E
P-shell nuclei within the modified J-matrix approach to scattering
— •Arina Sytcheva 1 , Frans Arickx 1 , Jan Broeckhove 1 , and
Viktor Vasilevsky 2 — 1 Groupe Computational Modeling and Programming,
University of Antwerpen, Middelheimlaan, 1, 2020, Antwerpen,
Belgium — 2 Bogoliubov Institute for Theoretical Physics, Metrolohichna
str., 14-b, Kiev, 03143, Ukraine
We will discuss coupled-channel calculations in two-cluster systems
with the possibility of collective excitations. We present a number of
results for such nuclei as 5 He, 5 Li and 8 Be. We use the modified J-matrix
method with the ”frozen” clusters. We take into account three possible
channels - cluster, monopole and quadrupole. Our focus is on the energy
region where only the cluster channel is open and the quadrupole and
monopole channels are closed. We calculate the phase shifts and derive
energies and widths of resonances within coupled and uncoupled channel
calculations. We can provide a clear-cut analysis of the resonances
which appear in the two-cluster continuum in terms of individual channel
contributions.
Time: Monday 15:45–18:45 Room: F
Group Report HK 7.1 Mon 15:45 F
Heavy-flavor measurements with the PHENIX experiment at
RHIC — •Ralf Averbeck for the PHENIX Collaboration collaboration
— State University of New York at Stony Brook
The production of heavy flavor, i.e. charm or beauty quarks, is an
important probe of the hot and dense medium created in high energy
nuclear collisions. Once produced, heavy quark-antiquark pairs form either
bound quarkonia or hadronize into separate particles carrying open
heavy flavor. The total yield is sensitive to the parton density in the
incoming nuclei and, as such, also reflects initial state nuclear effects like
shadowing. Medium effects from the hot and dense phase are expected
to leave their footprint on heavy-flavor observables in later stages of the
collision. The yield of heavy quarkonia might be reduced due to screening
of the QCD potential in a deconfined medium or even enhanced due
to coalescence. The issue of quark energy loss in the nuclear medium
constitutes a critical test of our understanding of these reactions as well.
One approach to study heavy-flavor physics in nuclear reactions is to
investigate the leptonic decay channels of particles carrying heavy flavor.
At RHIC, PHENIX is the only experiment specifically designed for the
measurement of electromagnetic probes and, therefore, is ideally suited
for such studies. Present results from p-p, d-Au, and Au-Au collisions at
√ sNN = 200 GeV are discussed.
Group Report HK 7.2 Mon 16:15 F
Anisotropic Flow and Global Observables in the Forward Directions
at RHIC — •Jörn Putschke for the STAR collaboration
— Max-Planck-Institut für Physik, Föhringer Ring 6, 80805 München
We present the first observation of directed flow (v1) in Au+Au collisions
at 200 GeV at RHIC. Measured by three particle correlations, v1
is found to be independent of pseudorapidity near mid rapidity (η = 0)
and a peak value of 1.5% around η = 4. This analysis also gives us the
first direct indication of in-plane elliptic flow at RHIC.
First results of the centrality and η dependence of particle multiplicity
density and mean transverse momenta in this forward region at the
STAR experiment will be reported for Au+Au collisions at √ sNN = 200
GeV and discussed in connection with the anisotropic flow measurements
in the limiting fragmentation picture.
The measurements of the centrality dependence of dN/dη and transverse
momentum spectra from mid-rapidity to forward rapidity in d+Au
collisions at 200 GeV provide a sensitive tool to understand the dynamics
of multi-particle production in the high parton density regime.
Comparsion with theoretical predictions of parton saturation in the
Color Glass Condensate [1] and a perturbative QCD parton model [2]
will be discussed.
[1] Dmitri Kharzeev, arXiv:hep-ph/0212316 v2 16 Jan 2003
[2] Xin-Nian Wang, arXiv:nucl-th/0303004 v1 3 Mar 2003
HK 7.3 Mon 16:45 F
Lambda production at high rapidity in d+Au and p+p collisions
at √ SNN = 200 GeV — •Frank Simon for the STAR collaboration
— Max–Planck–Institut für Physik, München, Germany
We present first studies of Lambda and Anti-Lambda production in the
pseudorapidity region 2.5 < |η| < 4, covered by the forward radial-drift
TPCs (FTPCs) at STAR. The FTPCs provide momentum and charge
determination but no particle identification, making the use of combinatorial
methods and background subtraction necessary for Lambda identification.
The Anti-Lambda/Lambda ratio measured at high rapidity will be
compared to the ratio obtained at mid-rapidity with the STAR TPC.
Differences in the ratio for different collision systems and a possible asymmetry
in d+Au collisions will give indications of what mechanisms drive
the antibaryon to baryon ratio at high rapidities.

Nuclear Physics Monday
HK 7.4 Mon 17:00 F
Recent Results From The PHENIX Experiment On p+p,
Au+Au And d+Au collisions at √ sNN = 200AGeV — •Ch.
Klein-Bösing for the PHENIX collaboration — Institut für
Kernphysik, Wilhelm-Klemm-Str. 9, 48149 Münster
One of the most interesting observations at the Relativistic Heavy Ion
Collider (RHIC) has been the suppression of particles with high transverse
momentum (pT) in central Au+Au collisions compared to peripheral
collisons and to expectations from proton+proton results, which is
attributed to an energy loss of hard scattered partons in a hot and dense
medium.
Additional information on the hot and dense phase can be obtained by
studying jet like back-to-back correlations, elliptic flow patterns and the
yield of direct photons. Direct Photons with large transverse momenta
are similar to high pT hadrons mainly produced by parton scattering in
the early phase of a heavy ion collision reaction, but should be unaffected
by the surrounding medium.
We will present recent results from the PHENIX experiment including
particle production, jet correlations and the search for direct photons
within different reaction systems (p+p, d+Au and Au+Au) at
√ sNN = 200AGeV.
Supported by BMBF and GSI.
HK 7.5 Mon 17:15 F
Eta production in p+p, d+Au and Au+Au-collisions at RHIC
— •Baldo Sahlmüller for the PHENIX collaboration — Universität
Münster, Institut für Kernphysik
In the PHENIX-experiment at RHIC the suppression of high pT neutral
pions in central Au+Au collisions relative to scaled yields measured
in p+p and d+Au collisions as well as those measured in peripheral
Au+Au collisions was observed. Protons, by contrast, do not show such
a suppression in the pT-region between 2 and 4 GeV/c. Therefore it is
important to study how this effect depends on the particle species.
In this talk, we present measurements from the PHENIX experiment
of the eta yields as a function of centrality (Au+Au) as well as of the different
reaction-systems (d+Au, p+p) with emphasis on the suppression
factor. Comparisons to the suppression of other particle species will be
presented.
Supported by BMBF and GSI.
HK 7.6 Mon 17:30 F
Energy dependence of transverse mass spectra of kaons
produced in p+p and p+p interactions. A compilation.
— •Benjamin Lungwitz, Michael Kliemant, and Marek
Ga´zdzicki — IKF Universität Frankfurt
The data on mT spectra of K 0 S, K + and K − mesons produced in
all inelastic p+p and p+p interactions in the energy range √ sNN =
4.7 − 1800 GeV are compiled and analyzed. The spectra are parameter-
ized by a single exponential function, dN
mT dmT = C·e−mT /T , and the inverse
slope parameter T is the main object of study. The T parameter is found
to be similar for K 0 s , K+ and K − mesons. It increases monotonically with
collision energy from T ≈ 130 MeV at √ sNN = 4.7 GeV to T ≈ 220 MeV
at √ sNN = 1800 GeV. The T parameter measured in p+p(p) interactions
is significantly lower than the corresponding parameter obtained
for central Pb+Pb collisions at all studied energies. Also the shape of
the energy dependence of T is different for central Pb+Pb collisions and
p+p(p) interactions. Partial support by Bundesministerium für Bildung
und Forschung and by Polish Committee of Scientific Research under
grant 2P03B04123 (M. G.) is acknowledged.
HK 7.7 Mon 17:45 F
Anisotropies in RHIC spectra - probing the detailed dynamics
— •Peter Kolb — Department of Physics and Astronomy, SUNY
Stony Brook, Stony Brook, NY 11794, USA — Physik Department, Technische
Universität München, D-85747 Garching
Anisotropies in the momenta spectra of non-central relativistic heavyion
collisions are sensitive on the collective expansion dynamics at the
earliest stages of the reaction. In the transverse plane, the azimuthal
dependence of the particle distribution is usually characterized through
v2 = 〈cos 2φ〉, the second coefficient of the corresponding Fourier expansion.
I will present arguments from which we can expected that also higher
order terms of the Fourier expansion in RHIC collisions reach an observable
magnitude of a few per cent, and that they carry valuable information
on details of the expansion dynamics. In order to give quantitative
estimates, I study different model calculations, spanning from hydrodynamic
expansion to the complementary geometric limit of fully quenched
jets. Furthermore the influence of the equation of state and geometry of
the initial state is discussed. I conclude, that although higher harmonics
are small, they are very sensitive on details of the model parameters
and are thus of great potential to extract quantitative statements from
the data. I will discuss recently published results on v4 in Au+Au collisions
by STAR [2] which appear to be in good agreement with earlier
hydrodynamic predictions [1].
[1] P.F. Kolb, Phys. Rev. C 68 (2003) 031902(R). [2] J. Adams et al.
nucl-ex/0310029.
HK 7.8 Mon 18:00 F
Dijet production as a centrality trigger for pp collisions at LHC
— L. Frankfurt 1 , M. Strikman 2 , and •C. Weiss 3 — 1 Tel Aviv U.,
Israel — 2 Pennsylvania State U., USA — 3 Regensburg U.
We show that a trigger on hard dijet production at small rapidities
allows to establish a quantitative distinction between central and peripheral
collisions in ¯pp and pp collisions at Tevatron and LHC energies. Such
a trigger strongly reduces the effective impact parameters as compared to
minimum bias events. This happens because the transverse spatial distribution
of hard partons (x ≥ 10 −2 ) in the proton is considerably narrower
than that of soft partons, whose collisions dominate the total cross section.
In the central collisions selected by the trigger, most of the partons
with x ≥ 10 −2 interact with a gluon field whose strength rapidly increases
with energy. At LHC energies the strength of this interaction approaches
the unitarity (“black–body”) limit. This leads to specific modifications
of the final state, such as a higher probability of multijet events at small
rapidities, a strong increase of the transverse momenta and depletion
of the longitudinal momenta at large rapidities, and the appearance of
long–range correlations in rapidity between the forward/backward fragmentation
regions. Studies of these phenomena would be feasible with
the CMS–TOTEM detector setup, and would have considerable impact
on the exploration of the physics of strong gluon fields in QCD, as well
as the search for new particles (Higgs, SUSY) at LHC [1].
[1] L. Frankfurt, M. Strikman, and C. Weiss, hep-ph/0311231
HK 7.9 Mon 18:15 F
Physics performance of the ALICE TRD — •Christoph Blume
for the ALICE TRD collaboration — Institut für Kernphysik der J. W.
Goethe Universität Frankfurt, August-Euler-Str. 6, 60486 Frankfurt/M.,
Germany
The ALICE experiment, currently under construction, is designed for
the investigation of heavy ion reactions at the LHC. One of its major
components is a Transition Radiation Detector (TRD), which will provide
electron identification as well as triggering capabilities for high transverse
momentum processes at mid-rapidity. The study of hard processes, in
particular charm and beauty production, is a crucial part of the ALICE
physics program. The TRD, together with the Inner Tracking System
(ITS) and the Time Projection Chamber (TPC), will allow the measurement
of high pt electrons. Furthermore, it can be used to trigger on high
pt ( > 3 GeV/c) particles, thus enriching the data samples for Υ measurements
and providing the possibility to select jets. We present a survey
of the physics performance of the ALICE TRD. Based on testbeam data
and detailed simulations the PID capabilities as well as the tracking performance
have been studied. The results will be discussed with respect
to physics observables, such as the charmonia measurements.
HK 7.10 Mon 18:30 F
Multiphoton Exchange Processes in Ultraperipheral Relativistic
Heavy Ion Collisions — •Kai Hencken 1 , Gerhard Baur 2 ,
Andreas Aste 1 , Dirk Trautmann 1 , Spencer Klein 3 , and Ute
Dreyer 1 — 1 Universität Basel, Switzerland — 2 Forschungszentrum
Jülich, Germany — 3 Lawrence Berkeley National Laboratory, USA
The very strong electromagnetic fields present in relativistic heavy ion
collisions allow to study photonuclear and photon-photon reactions in
ultraperipheral collisions (UPC) at RHIC and the LHC with energies
beyond what has been possible at HERA. Among them is the coherent
production of vector mesons (up to the Upsilon), a most important
QCD process [1]. Due to the strong field also higher order processes are
possible and have been used, e.g, as a trigger for UPCs [2]. We study
these multiphoton exchange processes in both perturbation theory and
Glauber approximation. Factorization of the multi-photon amplitudes
into independent single-photon amplitudes is found to be a good approximation
in many cases [3]. Due to the common impact parameter vector,

Nuclear Physics Monday
correlations in b are found. We discuss cases, where these correlations
can be detected. As a special case we calculate the cross section for e + e −
pair production together with GDR excitation of both ions [4], a process,
which was measured by STAR [5]. ([1] G. Baur et al., Physics Reports
HK 8 Plenary Session
364 (2002) 359. [2] C. Adler et al., PRL89, 272302 (2002). [3] G. Baur
et al., NPA729, 787 (2003). [4] K. Hencken et al., in preparation (2003).
[5] S. Klein for the STAR Collaboration, nucl-ex/0310020.)
Time: Tuesday 08:30–10:30 Room: P
Plenary Talk HK 8.1 Tue 08:30 P
QCD Thermodynamics — •Mikko Laine — Faculty of Physics,
University of Bielefeld, 33501 Bielefeld
The current understanding (based on analytical as well as numerical
techniques) regarding the equation of state of QCD matter is reviewed,
at and above the deconfinement phase transition temperature.
Plenary Talk HK 8.2 Tue 09:00 P
Non-equilibrium dynamics in quantum field theory — •Carsten
Greiner — Institut für Theoretische Physik, Johann Wolfgang Goethe
Universität Frankfurt, Robert-Mayer-Str. 8-10, 60054 Frankfurt
The description of many body systems or quantum fields out of equilibrium
represents a challenging and modern question for the microscopic
understanding of the dynamics of heavy ion collisions. The topic and
the developed techniques are also of importance for cosmology, atomic
physics and solid state physics, especially for understanding the onset
and dynamical evolution of phase transitions out of equilibrium. In this
talk we will give an overview of various applications with respect to heavy
ion physics.
Plenary Talk HK 8.3 Tue 09:30 P
Wobbling excitations in Nuclei - Proof of Stable Triaxiality ∗
— •A. Neußer, P. Bringel, H. Hübel, N. Nenoff, A.K. Singh,
and G. Schönwaßer for the EUROBALL collaboration — Helmholtz-
Institut für Strahlen- und Kernphysik, Univ. Bonn, Germany
The existence of nuclei with stable triaxial deformation has been predicted
theoretically for a long time. However, triaxiality is difficult to
prove experimentally and up to recently only ambiguous indications existed.
A unique fingerprint for triaxiality is the ’wobbling mode’ which
has been predicted more than 25 years ago [1]. Wobbling introduces a
series of rotational bands with increasing wobbling phonon number and
a characteristic pattern of γ-ray transitions between them.
The first evidence for wobbling excitations was obtained recently in
HK 9 Plenary Session
experiments with the EUROBALL spectrometer. In several Lu and Hf
nuclei superdeformed bands have been observed for which theory predicts
a pronounced triaxiality. In the odd-A isotopes 161−167 Lu families
of bands are identified that show the behaviour expected for wobbling.
The experimental results are reviewed and the wobbling interpretation,
based on particle-rotor calculations in which an odd proton is coupled to
a triaxial core, is presented.
[1] A. Bohr and B.R. Mottelson, Nuclear Structure, Volume II, Benjamin,
New York (1975)
∗ supported by BMBF and EU
Plenary Talk HK 8.4 Tue 10:00 P
Accelerator Mass Spectrometry and astrophysics — •Christof
Vockenhuber — Institut für Isotopenforschung und Kernphysik, Universität
Wien, Austria
Accelerator Mass Spectrometry (AMS) is a well-established method
to measure extremely low isotopic ratios down to 10 −17 . By counting
single atoms rather than their infrequent decay long-lived radionuclides
produced on Earth has been extensively studied with great success.
Beside these ’routine’ measurements AMS allows to investigate radionuclides
produced outside the Earth’s environment with mainly astrophysical
applications. Some of these (e. g. 60 Fe, 182 Hf, 244 Pu) can
naturally only be formed in stellar environments. Thus, finding traces of
these nuclides on Earth is a strong indication for a nearby nucleosyntesis
event (e. g. supernova) within a few half-lives of the radionuclide.
In addition, the technique used in AMS allows to determine minute
cross sections for nuclear reactions of astrophysics relevance, either by
measuring samples containing external produced radionuclides (e. g from
the reaction 25 Mg(p,γ) 26 Al), or by detecting radionuclides produced inside
the accelerator by inverse-reaction kinematics (e. g. 13 C(p,γ) 13 N).
In this talk I will give an overview of various possible AMS measurements
related to astrophysics and present first interesting and promising
results.
Time: Tuesday 11:00–12:30 Room: P
Plenary Talk HK 9.1 Tue 11:00 P
Towards Ab-Initio Nuclear Structure Calculations using
Correlated Realistic NN-Potentials — •Robert Roth 1 , Nils
Paar 1 , Heiko Hergert 1 , Thomas Neff 2 , and Hans Feldmeier 2
— 1 Institut für Kernphysik, Technische Universität Darmstadt —
2 Gesellschaft für Schwerionenforschung, Darmstadt
The implementation of realistic nucleon-nucleon interactions, such as
the Bonn or Argonne potentials, poses a challenge to modern nuclear
structure calculations. Two basic features of these interactions, the shortrange
repulsive core and the strong tensor force, generate pronounced correlations
within the many-body state, which cannot be described within
the simple model spaces available in traditional many-body techniques
for larger nuclei.
We discuss a new scheme, the Unitary Correlation Operator Method,
which includes these particular correlations into a given model space by
means of a unitary transformation. This enables us to deduce a phaseshift
equivalent correlated interaction which is well suited for Hartree-
Fock or Shell-Model-type calculations. We present results for ground
states and low-lying excitations across the whole nuclear chart up to
mass numbers A ≈ 60 obtained within a simple variational calculation
using Slater determinants of Gaussian single-nucleon trial states. Aspects
of angular momentum projection of the intrinsically deformed states and
configuration mixing are discussed as well as the possible inclusion of
three-body forces.
Plenary Talk HK 9.2 Tue 11:30 P
Double–polarization experiments with 3 He at MAMI —
•Daniela Rohe for the A1 collaboration — Department für Physik,
Universität Basel
In double–polarized experiments of the kind 3 � He(�e, e ′ N) one measures
not cross sections but asymmetries with respect to the helicity of the
electron beam. Asymmetries are much more sensitive to small quantities
like the form factor of the neutron, Gen, and the D-state component
in the wave function of 3 �He. In the first case polarized 3 �He serves as
a polarized neutron target, because the proton spins being in a S–state
couple to zero. An averaged target polarization of ≈ 50 % during the
beam time was achieved. The electron beam polarization at MAMI was
measured with a Moeller polarimeter to ≈ 80 %.
Theoretically electron scattering at polarized 3 � He is well understood
by Faddeev calculations for small Q 2 (< 0.4 (GeV/c) 2 ) below the pion
threshold. Recently, calculations with a limited treatment of FSI and relativistic
effects became available and have been confirmed with additional
measurements. This allows for correcting Gen at Q 2 of 0.67 (GeV/c) 2 .

Nuclear Physics Tuesday
Plenary Talk HK 9.3 Tue 12:00 P
VCS at JLab and MAMI — •Luc Van Hoorebeke for the VCS
collaboration at MAMI and the Jefferson Lab Hall A/VCS
collaboration — Department of Subatomic and Radiation Physics,
UGent, Proeftuinstraat 86, 9000 Gent, Belgium
Virtual Compton Scattering (VCS) off the proton refers to the reaction
γ ∗ + p → γ + p ′ . At low c.m. energies this reaction allows to measure
(combinations of) the 6 Generalized Polarizabilities (GPs) of the proton.
These new observables are an extension of the electromagnetic polar-
izabilities α and β obtained from Real Compton Scattering. They are
related to the ease with which the nucleon adapts its internal structure
to an external quasi-static electromagnetic field.
At MAMI and JLab the first dedicated VCS experiments have been
performed to obtain information on the GPs at different values of Q 2 .
The γ ∗ + p → γ + p ′ reaction is accessible through photon electroproduction,
whereby the scattered electron and recoil proton are detected
in high resolution magnetic spectrometers and photon production events
are identified by missing mass reconstruction. Results from these experiments
will be presented, as well as future prospects.
HK 10 Poster Session: Nuclear Structure/Spectroscopy
Time: Tuesday 13:30–15:30 Room: Foyer
HK 10.1 Tue 13:30 Foyer
High spin states in the nuclei 74 Kr, 75 Kr and 76 Kr — •T. Steinhardt
1 , J. Eberth 1 , S. Skoda 1 , O. Thelen 1 , C. Plettner 2 , H.
Schnare 2 , R. Schwengner 2 , F. Dönau 2 , G. de Angelis 3 , E.
Farnea 4 , A. Gadea 4 , A. Jungclaus 5 , K.P. Lieb 5 , D. R. Napoli 3 ,
and R. Wadsworth 6 — 1 Inst. für Kernphysik, Universität Köln, Köln
— 2 Inst. für Kern- und Hadronenphysik, FZ Rossendorf, Dresden, Germany
— 3 INFN, Laboratori Nazionali di Legnaro, Legnaro, Italy —
4 Instituto de Fisica Corpuscular, Valencia, Spain — 5 II. Phys. Inst., Universität
Göttingen, Göttingen, Germany — 6 University of York, Physics
Department, Heslington, York, UK
At low spin, the deformation of nuclei in the A ≈ 80 mass region is
strongly changing for neighboring nuclei as consequence of the low Nilsson
level density. Due to the proximity of N=Z, p-n pairing may also play
an important role. The motivation for the analysis of the nuclei 73 Kr,
74 Kr, 75 Kr and 76 Kr was to study the influences of the Nilsson structure
and the p-n pairing on high spin states. To investigate the nuclei, the
data of an experiment applying the EUROBALL spectrometer, including
the silicon detector array ISIS for charged particle identification and the
BC501A scintillator array NWALL for neutron detection, have been analyzed.
The reaction was 40 Ca + 40 Ca at 185MeV beam energy. From the
analysis of multi-dimensional Eγ histograms, levels up to an excitation
energy of ≈ 30MeV and estimated spins of 35¯h could be established. The
results are discussed with respect to the systematics of this mass region
and compared to calculations in the cranked shell model.
This work is supported by the BMBF under contract no. 06 OK 958.
HK 10.2 Tue 13:30 Foyer
Shell model analysis of Q-phonon purity around A=90 ∗ — •V.
Werner, P. von Brentano, and N. Pietralla — Institut für Kernphysik,
Universität zu Köln
It will be shown that collective degrees of freedom still dominate lowlying
levels in nuclei with only few valence particles around A=90. Nuclei
with neutron number N=52 were investigated during the last years and
states were identified as so-called symmetric and mixed-symmetric (MS)
states. MS means that a part of the wave function is anti-symmetric
under the exchange of protons and neutrons. Due to the sub-shell closure
at Z=38 one may assume that the Q-phonon scheme, building the
low-lying levels in nuclei by acting with the quadrupole operator on the
ground state, breaks down in this region. Therefore, shell model calculations
were performed for 92,94 Zr and 94 Mo. The Q-phonon scheme,
distinguishing between F-scalar and F-vector Q-phonons holds to a large
extent for 94 Mo, comparable to findings in the Ba isotopic chain by the
Tokyo MCSM group [1]. For the Zirconium isotopes with severely broken
F-spin [2] the picture regarding seperately symmetric and MS Qphonons
indeed starts to break down. Nevertheless, it is shown that the
Q-phonon scheme itself still holds to about 80 % in 92 Zr showing that
the main configurations of the lowest two 2 + states are still one-phonon
configurations.
[1] N. Shimizu et al., Phys. Rev. Lett. 86 (2000) 1171.
[2] V. Werner et al., Phys. Lett. B 550 (2002) 140.
∗ supported by the DFG under contract Br799/11-1
HK 10.3 Tue 13:30 Foyer
High spin states in the odd-even nucleus 69 As — •I. Stefanescu 1 ,
J. Eberth 1 , I. Ragnarsson 2 , G. Carlsson 2 , G. Gersch 1 , T.
Steinhardt 1 , O. Thelen 1 , N. Warr 1 , and D. Weisshaar 1 —
1 Institute for Nuclear Physics, University of Cologne, Zülpicherstr. 77,
D-50937 Cologne, Germany — 2 Department of Mathematical Physics,
Lund Institute of Technology, PO Box 118, S-22100, Lund, Sweden
Excited states in 69 As have been studied using the 40 Ca( 32 S,3p) 69 As
reaction at 95 and 105 MeV beam energy delivered by the VIVITRON
accelerator of the IReS Strasbourg. Gamma rays have been detected
with the EUROBALL spectrometer operated in conjunction with the
Neutron WALL and the charged-particle detector EUCLIDES. New level
sequences with positive and negative parity have been identified from γγ
and γγγ coincidences. Spins and parities were deduced, whenever possible,
from the analysis of the DCO ratios and from a comparison with
the systematics.
The results are interpreted in the framework of the configurationdependent
cranked Nilsson-Strutinsky approach [1].
[1] A. Afanasjev et al., Phys. Rep., 322, 1(1999).
HK 10.4 Tue 13:30 Foyer
High resolution ( � d, p) study of 197 Pt — •Oliver Möller 1 , H.-F.
Wirth 2 , Y. Eisermann 2 , R. Hertenberger 2 , G. Graw 2 , S. Christen
1 , and J. Jolie 1 — 1 IKP, Universität zu Köln — 2 Sektion Physik,
LMU München
On the basis of the supersymmetric version of the interacting boson
model it is possible to describe even-even, even-odd and odd-odd nuclei
simultaneously.
In the quartet 194,195 Pt, 195,196 Au relevant parts of experimental spectra
can be reproduced successfully in supersymmetric theory [1],[2].
To extend these studies on the neighboring quartet of nuclei a ( � d, p)
transfer experiment to 197 Pt was performed. Excitation energy spectra
and angular distributions were measured with a polarized deuteron
beam at the Munich Q3D spectrometer.
Results from this experiment - excitation energies, spins and parities -
are presented and compared with model predictions.
[1] J.Jolie et al., Phys. Rev. C 43 (1991) R16
[2] A.Metz et al., Phys. Rev. Lett. Vol.83 No.8 (1999)
Work supported by DFG under C4-Gr894/2-3, Jo391/2-1
HK 10.5 Tue 13:30 Foyer
Check for Chirality of Nuclear Rotation in 134 Pr via Lifetime
Measurements — •D. Tonev 1 , G. de Angelis 1 , P. Petkov 2,3 , A.
Dewald 3 , A. Gadea 1 , D. Balabanski 4 , P. Bednarczyk 5 , F. Camera
6 , A. Fitzler 3 , K. Jessen 3 , N. Margenian 1 , O. Möller 3 , A.
Paleni 6 , C. Petrache 4 , K.O. Zell 3 , Y.H. Zhang 7 , and S. Frauendorf
8,9 — 1 INFN, LNL, Legnaro, Italy — 2 BAS, INRNE, Sofia, Bulgaria
— 3 IKP, Universität zu Köln, Köln, Germany — 4 DMF, University of
Camerino, Camerino, Italy — 5 IReS, Strasbourg, France — 6 DF, University
of Milano, Milano, Italy — 7 IMP, CAS, Lanzhou, P.R. China
— 8 DP, University of Notre Dame, Notre Dame, USA — 9 IKH, RCR,
Dresden, Germany
Chirality in nuclear rotation is a novel collective feature predicted
for odd-odd nuclei from angular momentum coupling considerations [1].
Electromagnetic transition probabilities are crucial experimental observables
for the understanding of nuclear structure and for checking the
reliability of the theoretical models. The lifetimes of the levels of the

Nuclear Physics Tuesday
doublet bands in 134 Pr were measured by means of the recoil-distance
Doppler-shift and Doppler-shift attenuation methods using the multidetector
array Euroball. The excited states of the 134 Pr were populated
via the reaction 119 Sn( 19 F,4n) 134 Pr at a beam energy of 88 MeV. The
determined transition probabilities are compared with the theoretical
predictions of different models.
[1] S. Frauendorf and J. Meng, Nucl. Phys. A 619 (1997) 131.
HK 10.6 Tue 13:30 Foyer
Relativistic Coulomb Excitation of 56 Cr † — •A. Bürger 1 , H.
Hübel 1 , P. Reiter 2 , H. J. Wollersheim 3 , J. Gerl 3 , H. Grawe 3 ,
M. Górska 3 , A. Al-Khatib 1 , A. Banu 3 , T. Beck 3 , F. Becker 3 , P.
Bednarczyk 3 , G. Benzoni 4 , A. Bracco 4 , P. Bringel 1 , F. Camera
4 , E. Clement 5 , P. Doornenbal 3 , A. Görgen 5 , J. Grebosz 6,3 ,
M. Hellström 3 , M. Kmiecik 6 , I. Kojouharov 3 , N. Kurz 3 , G. Lo
Bianco 7 , R. Lozeva 3 , A. Maj 6 , S. Mandal 3 , W. Meczynski 6 , D.
Mehta 8 , B. Millon 4 , S. Muralithar 9,3 , A. Neußer 1 , C. Petrache
7 , T. S. Reddy 10 , N. Saito 3 , T. Saito 3 , H. Schaffner 3 , A.K.
Singh 1 , H. Weick 3 , C. Wheldon 3 , O. Wieland 4 , and M. Winkler
3 for the RISING collaboration — 1 HISKP, Univ. Bonn — 2 IKP,
Univ. Köln — 3 GSI, Darmstadt — 4 INFN, Milano, Italy — 5 CEA Orsay,
France — 6 Henryk Niewodniczanski Inst. of Nucl. Phys., Krakow,
Poland — 7 Dept. of Phys., Univ. Camerino, Italy — 8 Dept. of Phys.,
Panjab Univ., India — 9 NSC, New Delhi, India — 10 Dept. of Nucl.
Phys., Andhra Univ., India
As one of the first experiments with the new RISING spectrometer,
relativistic Coulomb excitation has been performed on the nucleus 56 Cr
with the aim to investigate shell structures of nuclei with extreme isospin.
A stable 86 Kr beam has been fragmented on a primary Be target and,
after filtering out unwanted ions with the FRS, Coulomb exitation was
performed in a secondary Au target. The emitted γ rays were observed
by the Ge Cluster detectors of RISING in coincidence with particle and
position signals from a large set of other detectors. The steps of the
analysis and first results will be presented. † Supported by BMBF
HK 10.7 Tue 13:30 Foyer
Wobbling Excitation in Triaxial 161 Lu ∗ — •P. Bringel 1 , A. Alkhatib
1 , A. Bürger 1 , H. Hübel 1 , N. Nenoff 1 , A. Neusser 1 , G.
Schönwasser 1 , A.K. Singh 1 , G.B. Hagemann 2 , B. Herskind 2 ,
D.R. Jensen 2 , G. Sletten 2 , D.T. Joss 3 , J. Simpson 3 , P. Bednarczyk
4 , D. Curien 4 , G. Gangopadhyay 5 , Th. Kröll 6 , G. Lo
Bianco 7 , C. Petrache 7 , S. Lunardi 8 , W.C. Ma 9 , and N. Singh 10
— 1 HISKP, Univ. Bonn, Germany — 2 NBI, Copenhage, Denmark —
3 Daresbury Lab., Daresbury, UK — 4 IReS, Strasbourg, France — 5 Dep.
of Physics, Kolkata Univ., India — 6 INFN, LNL, Legnaro, Italy —
7 Dipart. di Fisica, Univ. di Camerino, Italy — 8 Dipart. di Fisica,
Univ. di Padova, Italy — 9 Dep. of Physics, Mississippi State University,
USA — 10 Dep. of Physics, Panjab University, India
In several Lu and Hf isotopes rotational bands with large deformation
have been observed in recent years for which theory predicts a pronounced
stable triaxiality (γ ≈ ±20 ◦ ). The triaxial shape has been confirmed by
the observation of the ’Wobbling Mode’ [1] which is a unique fingerprint.
High-spin states in 161 Lu have been populated in the reaction
139 La( 28 Si,6n) at the Vivitron tandem accelerator at IReS, Strasbourg.
Gamma-ray coincidences were measured with the EUROBALL spectrometer
array. The analysis revealed two bands with very similar properties
which are linked by enhanced E2 transitions. This pattern is characteristic
for wobbling excitations.
[1] D.R. Jensen et al., Phys. Rev. Lett. 89, 142503 (2002).
∗ supported by BMBF and EU
HK 10.8 Tue 13:30 Foyer
High-spin states in 124 Ba ∗ — •A. Al-Khatib 1 , A.K. Singh 1 , A.
Bürger 1 , P. Bringel 1 , H. Hübel 1 , A. Neußer 1 , G.B. Hagemann
2 , B. Herskind 2 , C.R. Hansen 2 , G. Sletten 2 , D. Curien 3 ,
A. Maj 4 , A. Lopez-Martens 5 , A. Bracco 6 , P. Fallon 7 , and B.M.
Nyakó 8 for the EUROBALL collaboration — 1 HISKP, Univ. Bonn,
Germany — 2 NBI, Copenhagen, Denmark — 3 IReS, Strasbourg, France
— 4 IFJ, Krakow, Poland — 5 CSNSM, Orsay, France — 6 Univ. Milano,
Italy — 7 LBNL, Berkely, USA — 8 ATOMIKI, Debrecen, Hungary
High-spin states in the nucleus 124 Ba have been populated in the
64 Ni( 64 Ni,4n) reaction at beam energies of 255 and 261 MeV. The beam
was provided by the Vivitron tandem accelerator at IReS and γ-ray
coincidences were measured with the EUROBALL spectrometer array.
Previously known rotational bands in 124 Ba [1] could be extended to
higher spins and three new bands were found, one of them extending into
the spin-40 region. The structure of the bands, including band crossings
and band termination, is discussed and compared to cranked shell model
calculations.
[1] S. Pilotte et al, Nucl. Phys. A514 (1990) 545
∗ Work supported by BMBF and EU
HK 10.9 Tue 13:30 Foyer
Update of the High-Resolution Energy-Loss Electron Scattering
Spectrometer at the S-DALINAC ∗ — •O. Burda, J. Enders,
A. Lenhardt, P. von Neumann-Cosel, M. Platz, A. Richter,
and S. Watzlawik — Institut für Kernphysik, Technische Universität
Darmstadt, Germany
The 169 ◦ Energy-Loss Spectrometer at the S-DALINAC is used for
high resolution electron scattering experiments. The spectrometer and
its detector system in particular has undergone a complete redesign. The
new detector system is now based on semiconductor microstrip detectors
which deliver a high resolution defined only by the geometric configuration
of the strip size. A new data acquisition system was developed
which using highly sophisticated technologies like FPGAs, CPLDs and
Embedded Systems. Here, the sequencer is synthesized in the CPLD
while the memory management, discriminator and counting units make
use of the FPGA. A RISK based Controller provides the interface between
the FPGA, the CPLD and the data transmission path. The data
transmission path itself is realized with well-known ethernet technologies
and therefore allows to use standard user frontends for data processing.
Browsers, for example, gives the possibility to observe the spectra online.
With this setup, it is possible to carry out scattering experiments with a
momentum resolution of ∆p/p = 3×10 −4 and event rates up to 160 kHz
at a detection efficiency close to 100%.
∗ Supported by the DFG under contract SFB 634.
HK 10.10 Tue 13:30 Foyer
High-resolution beta-decay spectroscopy of 103 Sn — •Oksana
Kavatsyuk for the GSI-ISOL collaboration — GSI Darmstadt, Planckstr.
1, 64291 Darmstadt, Germany
100 Sn is the heaviest doubly-magic N=Z nucleus, located at the proton
drip line, where protons and neutrons occupy identical shell-model
orbitals. Such a doubly closed-shell nucleus and its neighbours provide
a sensitive test ground for the nuclear shell model. 103 Sn was produced
in the fusion-evaporation reaction 58 Ni( 50 Cr, αn) 103 Sn with a 4.9 A·MeV
58 Ni beam on a 3 mg/cm 2 thick 50 Cr target and studied at the GSI-ISOL
facility. The isobaric indium, cadmium, silver and palladium contaminants
were suppressed by separating 103 Sn 32 S + molecular ions [1]. The
β-delayed γ-rays of 103 Sn were measured for the first time with a highresolution
array of germanium (17 crystals) and silicon detectors. In
additional to the 1077 keV transition known from in-beam spectroscopy
[2], fifteen new γ transitions in 103 In were identified. The half-life of
103 Sn was determined to be 6.9±0.4 s. The level scheme of 103 In was constructed
by using β-γ-γ coincidences. Shell-model calculations account
well for all observed levels.
[1] R. Kirchner, Nucl. Instr. and Meth. in Phys. Res. B204 (2003) 179
[2] J. Kownacki et al., Nucl. Phys. A627 (1997) 239
HK 10.11 Tue 13:30 Foyer
Photoneutron reaction rates of the nuclei 191,193 Ir ∗ — •A.
Kretschmer 1 , D. Galaviz 1 , S. Müller 1 , T. Rauscher 2 , K.
Sonnabend 1 , K. Vogt 1 , and A. Zilges 1 — 1 Institut für Kernphysik,
Technische Universität Darmstadt, D-64289 Darmstadt, Germany —
2 Institut für Physik, Universität Basel, CH-4056 Basel, Switzerland
The cross section and the astrophysical ground state reaction rates of
the reactions 191 Ir(γ,n) 190 Ir and 193 Ir(γ,n) 192 Ir have been measured close
above the neutron separation energies at Ethr = 8.07 MeV and Ethr =
7.77 MeV, respectively, using the method of photoactivation. The results
are important for a better understanding of the s- and p-process [1,2,3,4]
in this region of the chart of nuclides. They will be compared to theoretical
calculations as well as to other experimental data. ∗ supported
by the DFG (SFB 634 and Zi 510/2-2) and by the Swiss NSF (grants
2124-055832.98, 2000-061822.00, 2024-067428).
[1] B. L. Berman et al., Phys. Rev. C 36, 1286 (1987)
[2] S. C. Fultz et al., Phys. Rev. 127, 1273 (1962)
[3] P. Mohr et al., Phys. Lett. B488, 127 (2000)
[4] K. Sonnabend et al., Astrophys. J. 583, 506 (2003)

Nuclear Physics Tuesday
HK 10.12 Tue 13:30 Foyer
High Resolution γ Spectroscopy at the Big Bite Spectrometer ∗
— •K. Lindenberg 1 , D. Savran 1 , A. M. van den Berg 2 , P. Dendooven
2 , M. Harakeh 2 , S. de Jong 2 , A. Matic 2 , A. Mol 2 , H.
Wörtche 2 , and A. Zilges 1 — 1 Institut für Kernphysik, Technische
Universität Darmstadt, Germany — 2 Kernfysisch Versneller Instituut,
Groningen, The Netherlands
We plan to study electric-dipole excitations below the particle threshold
in the magic nuclei 48 Ca and 138 Ba by means of the (α, α ′ γ) reaction
at 120 MeV incident energy at the KVI in Groningen. Compared to the
pioneering experiment using NaI detectors for the detection of the γrays[1],
we will use five highly efficient high resolution Ge(HP) detectors
with active BGO shields in conjunction with the BBS[3]. Therefore, a
resolution better than 10 keV for the detection of γ-energies in the excitation
region of interest will become feasible. The identification of the
isospin character of low-lying excitations will provide the testing ground
for numerous, partly contradicting theoretical descriptions[2]. An improved
understanding of these excitations will have an important impact
on the description of nucleosynthesis in explosive stellar burning phases.
∗ supported by the DFG (SFB 634) and the European Commission under
contract HPRI-CT-1999-00109
[1] D. Poelhekken et al., Phys. Lett. B 278 (1992) 423.
[2] A. Zilges et al., Phys. Lett. B 542 (2002) 43.
[3] A. M. van den Berg, Nucl. Instr. Meth. Phys. Res. B 99 (1995) 637.
HK 10.13 Tue 13:30 Foyer
Direct proof of the |2 + ⊗ 3 − 〉-two phonon character of the 1 − 1 -
state in 140 Ce ∗ — •T. Hartmann 1 , M. Babilon 1,2 , R.F. Casten 2 ,
J. Hasper 1 , A. Hecht 2 , M. Caprio 2 , and A. Zilges 1 — 1 Institut für
Kernphysik, TU Darmstadt, Germany — 2 Physics Department - Wright
Nuclear Structure Laboratory, Yale University, New Haven, CT, USA
A (p,p’γ)-experiment has been performed at the ESTU tandem accelerator
at Yale University using 9 high resolution Ge(HP) Clover-detectors
and 4 proton detectors to investigate the decay pattern of the first excited
J π = 1 − -state in 140 Ce. As in its N = 82-isotones 142 Nd and 144 Sm this
level is expected to be the member of a quintuplett of negative parity
states arising from the coupling of two phonons (2 + 1 ⊗ 3 − 1 ) representing
surface oscillations. The two phonon character of this collective isoscalar
mode had been confirmed for 142 Nd and 144 Sm, by measuring the branching
ratio of its decay to the 3 − 1 -state, where the branching ratio is 0.8%
and 1.1%, respecitvely [1]. To proof the two-phonon character of this
state in 140 Ce, a branching ratio of only 0.4% had to measured.
∗ supported by the DFG (SFB 634 and Zi510/2-2) and by the US DOE
(DE-FG02-91ER-40609)
[1] M. Wilhelm et al., Phys. Rev. C54 (1996) 449R.
HK 10.14 Tue 13:30 Foyer
Parity assignments in 172,174,176 Yb using polarized photons ∗ —
•D. Savran 1 , M.W. Ahmed 2 , M. Babilon 1,3 , J.H. Kelley 4 , J. Li 5 ,
S. Müller 1 , B. Perdue 2 , I. Pinaev 5 , A. Tonchev 2 , W. Tornow 2 ,
H.R. Weller 2 , Y. Wu 5 , and A. Zilges 1 — 1 Institut für Kernphysik,
Technische Universität Darmstadt, D-64289 Darmstadt, Germany —
2 Triangle Universities Nuclear Laboratory, Duke University, Durham,
NC, USA — 3 A. W. Wright Structure Laboratory, Yale University, New
Haven, CT, USA — 4 Triangle Universities Nuclear Laboratory, North
Carolina State University, Raleigh, NC, USA — 5 Free Electron Laser
Laboratory, Department of Physics, Duke University, Durham, NC, USA
In previous (γ, γ ′ ) experiments using unpolarized bremsstrahlung
strong dipole transitions were observed in the rare-earth nuclei
172,174,176 Yb in the energy region between 2.5-3.5 MeV [1]. Most of
the transitions are believed to belong to the M1 scissors mode, which
is strongly fragmented in these nuclei [2], however no parities have
been measured so far. We used the 100% linearly polarized Compton
backscattered γ-Ray Beam of the HIγS-facility at TUNL, which has been
shown to be very suitable for parity assignments of dipole excitations
[3].
* supported by the DFG (SFB 634), by the DAAD and U.S. DOE Grant
No. DE-FG02-97ER41033.
[1] A. Zilges et al., Nucl. Phys. A507, 399 (1990)
[2] U. Kneissl et al., Prog. Part. Nucl. Phys. 37, 349 (1996)
[3] N. Pietralla et al., Phys. Rev. Lett. 88, 1 (2002)
HK 10.15 Tue 13:30 Foyer
Search for E2 Strength Below the Isoscalar Quadrupole Giant
Resonance in 52 Cr with Resonant Photon Scattering ∗ —
•O. Karg, J. Enders, P. von Neumann-Cosel, A. Richter, and
S. Volz — Institut für Kernphysik, Technische Universität Darmstadt,
64289 Darmstadt, Germany
Motivated by the unusually large exhaustion of the energy-weighted
sum rule for isoscalar B(E2) strength below 10 MeV in 48 Ca [1], we
searched for E2 strength in another N = 28 nucleus, 52 Cr. A nuclear resonance
fluorescence experiment was performed at the S-DALINAC using
a bremsstrahlung beam with an endpoint energy of 9.9 MeV. Experimental
results and a comparison to shell-model and quasiparticle-phonon
model calculations are presented.
[1] T. Hartmann et al., Phys. Rev. Lett. 85 (2000) 274; Phys. Rev C 65
(2002) 037303.
∗ Supported by DFG under contract SFB 634.
HK 10.16 Tue 13:30 Foyer
Simulation of the experiment “Bremsstrahlung in α-decay”
— •Vinzenz Bildstein, Hans Boie, Heiko Scheit, and Dirk
Schwalm — Max-Planck-Institut für Kernphysik, Heidelberg, Germany
At the MPI für Kernphysik in Heidelberg an experiment to measure
the Bremsstrahlung emission probability in the α-decay of 210 Po[1] is
currently performed.
A simulation of the experiment was written to calculate the efficiency
of the setup of the experiment for coincident α and γ particles. The simulation
is based on the Geant4[2] package that provides the C++-classes
for a Monte-Carlo simulation of the interactions of α and γ particles with
matter.
Different experimental setups were simulated to study the influence
of uncertainties in the geometry of the experiment on the γ efficiency.
Examples for these uncertainties are the positions of the detectors and
thicknesses of materials the γ rays have to penetrate. In addition, the
results of the simulation were compared to data from the experiment and
the influence of various assumptions on the γ–α angle correlation on the
efficiency was studied.
The calculated efficiency dependence on the energy of the Bremsstrahlung
and the systematic errors from the mentioned uncertainties
in the geometric setup of the experiment will be presented.
[1] Aufbau eines Experimentes zur Messung der Emissionswahrscheinlichkeit
von Bremsstrahlung im α-Zerfall von 210 Po, Diplomarbeit, Hans-
Hermann Boie, MPI für Kernphysik, 2002
[2] http://geant.cern.ch
HK 10.17 Tue 13:30 Foyer
208 Pb(p,p’) via IAR and the shell model — •Andreas Heusler 1 ,
Peter von Brentano 2 , Gerhard Graw 3 , Ralf Hertenbeger 3 ,
and Hans-Friedrich Wirth 3 — 1 MPI f. Kernphysik, Heidelberg —
2 Institut f. Kernphysik, Uni Köln — 3 LMU München, supported by MLL
and DFG C4-Gr894/2-3
Spektra of 208 Pb(p,p’) were measured on several IAR (Ep = 14.9−17.5
MeV) in 209 Bi with an energy resolution of 4 keV and a background
less than 10 −3 for strong lines. From the angular distributions neutron
particle-hole shell model configurations can be determined; in some cases
also spins can be derived. Assuming a nearly complete neutron and proton
particle-hole configuraion space for some subset of states in 208 Pb,
the residual interaction among particle-holes states can be determined.
Special care was taken to measure small components of particle-hole configurations,
since they enter into the orthogonality in a sensitive manner.
Another aspect was the study of the j15/2 IAR in 209 Bi.
HK 10.18 Tue 13:30 Foyer
CLUSTER EMISSION ( 8 Be, 12 C ∗ (0 + 2 )) IN COMPOUND NU-
CLEUS REACTIONS — •Tz. Kokalova 1,2 , W. von Oertzen 1,2 ,
S. Torilov 1,2 , S. Thummerer 2 , H.G. Bohlen 2 , M. Milin 1,2 ,
A. Tumino 2 , G. de Angelis 3 , M. Axiotis 3 , E. Farnea 3 , N.
Marginean 3 , T. Martinez 3 , D.R. Napoli 3 , S.M. Lenzi 4 , C. Ur 4 ,
M. Rousseau 5 , and P. Papka 5 — 1 Freie Universität Berlin, Germany
— 2 Hahn-Meitner-Institut Berlin, Germany — 3 INFN-Laboratori
Nazionali di Legnaro, Legnaro, Italy — 4 Dipartimento di Fisica and
INFN, Padova, Italy — 5 Institut de Recherches Subatomiques, IreS,
Strasbourg, France
The emission of unbound 8 Be and 12 C ∗ clusters has been studied in 1)
the 18 O+ 13 C→ 23 Ne+( 8 Be or 2α) reaction, at an energy of EL( 18 O) = 100

Nuclear Physics Tuesday
MeV, meant for the study of Ne isotopes and 2) the 28 Si+ 24 Mg → 40 Ca
+( 12 C or 3α) reaction, at an incident energy of 130 MeV, an experiment
designed to observe the emission of 8 Be and the 3α channel as the main
compound decay channels. The results obtained from comparing the γray
spectra in the case of fusion-fission and fusion-evaporation leading to
the same residual nuclei are discussed. We observed that in the fusionfission
process the residual nucleus has more excitation energy and the
subsequent emission of another light particle (n, p or α) is enhanced. A
quantitative analysis of the energy spectra of 2 or 3 subsequently emitted
α-particles and 8 Be or 12 C ∗ clusters has been carried out. The angularmomentum-to-energy-balance
of the cluster emission is compared with
that of the multiple α-emission and an interpretation of the results is
given.
HK 10.19 Tue 13:30 Foyer
BINARY AND NON-BINARY DECAY CHANNELS OF
COMPOUND NUCLEI FORMED IN 24 Mg + 32 S and 24 Mg
+ 36 Ar REACTIONS — •G. Efimov 1,2 , S. Thummerer 2 , G.
Gebauer 2 , W. von Oertzen 1,2 , Ch. Schulz 2 , H.G. Bohlen 2 ,
Tz. Kokalova 1,2 , D.R. Napoli 3 , S.M. Lenzi 4 , C. Ur 4 , C.
Beck 5 , M. Rousseau 5 , P. Papka 5 , and D. Kamanin 6 — 1 Freie
Universität Berlin, Germany — 2 Hahn-Meitner-Institut Berlin,
Germany — 3 INFN-Laboratori Nazionali di Legnaro, Legnaro, Italy
— 4 Dipartimento di Fisica and INFN, Padova, Italy — 5 Institut de
Recherches Subatomiques, IreS, Strasbourg, France — 6 Joint Institute
for Nuclear Research, JINR, Dubna, Russia
Measurements have been performed in Strasbourg using the Binary
Reaction Spectrometer (BRS) together with the EUROBALL array of
germanium detectors. This combination enabled particle-γ coincidences
to be measured and the kinematics of the reaction to be fully reconstructed.
The angular correlations in the binary and non-binary decay
channels of the reactions 32 S + 24 Mg → 56 Ni at an energy of EL = 163.5
MeV and 36 Ar + 24 Mg → 60 Zn at an energy of EL = 195 MeV have
been studied. In the case of no missing charge, the reactions are coplanar
except for a small contribution due to neutron evaporation. The
out-of-plane correction is broader for ∆Z = 2 and a narrow component
unexpectedly dominates for ∆Z = 4. This observation can be interpreted
as due to extreme deformations of the compound (even-even) nuclei. In
order to interpret the results an Extended-Hauser-Feshbach approach is
applied.
HK 10.20 Tue 13:30 Foyer
Simultaneous observation of bound and continuum beta decay
of bare 207 Tl — •L. Maier 1 , D. Boutin 2 , T. Yamaguchi 2 , ESR
group 2 , and FRS group 2 — 1 Physik Department E12, TU-München
— 2 Gesellschaft für Schwerionenforschung GSI, Darmstadt
Neutral 207 Tl atoms decay via continuum beta decay to their daughter
207 Pb. The additional bound state beta decay channel opens up for fully
ionized 207 Tl 81+ ions which can decay to hydrogen like 207 Pb 81+ ions. To
investigate the lifetime of bare 207 Tl ions and the branching ratio of the
two decay channels an experiment at the GSI was carried out in spring
2003. The bare 207 Tl ions were produced using the Fragment Separator
FRS and injected into the Experimental Storage Ring ESR. Beam cooling
in a matter of seconds after injection was achieved by successively
applying stochastic and electron cooling. Via Schottky noise analysis
it was possible to simultaneously observe the decreasing number of the
207 Tl 81+ nuclei as well as the increasing number of the bare and hydrogen
like 207 Pb daughter ions. Additionally a Si-stack detector could be
moved into the ring for directly counting the hydrogen like 207 Pb ions
originating from the continuum beta decay channel. An overview of the
experimental setup will be given and the results for the total lifetime
and branching ratio of bare 207 Tl will be compared with calculations.
Supported by BMBF(06 TM 970/1) and GSI Darmstadt.
HK 10.21 Tue 13:30 Foyer
Two Neutron Transfer Reactions with 10 Be Targets* — •W.
Schwerdtfeger 1 , C. Alvarez 1 , B. Bruyneel 2 , T. Faestermann
3 , R. Gernhäuser 3 , D. Habs 1 , T. Kröll 3 , R. Krücken 3 , M.
Lauer 4 , R. Lutter 1 , M. Mahgoub 3 , H.J. Maier 1 , T. Morgan 1 ,
M. Münch 3 , O. Niedermaier 4 , P. Reiter 2 , o. Schaile 1 , H.
Scheit 4 , P. Thirolf 1 , W. von Oertzen 5 , N. Warr 2 , and H.
Wolter 1 for the MINIBALL collaboration — 1 Sektion Physik, Ludwig
Maximilians Universität München — 2 Institut für Kernphysik, Köln
— 3 E12, Technische Universität München — 4 Max Plank Institut,
Heidelberg — 5 Hahn Meitner Institut, Berlin
Transfer reactions enable to investigate the shape coexistence of e.g.
deformed and spherical 0 + states in Mg isotopes around the island of
inversion at N ≈ 20. 2n transfer reactions from a radioactive 10 Be target
provide a distinct trigger via the two α particles ejected from the intermediate
8 Be reaction product. The 10 Be targets (t1/2 = 1.6 ·10 6 a) with a
thickness of ≈ 110µg/cm 2 were produced by a micro-evaporation module
onto a carbon backing of ≈ 40µg/cm 2 . In order to estimate the cross section
of the 2n transfer 10 Be( 30 Mg, 32 Mg) 8 Be, which is intended to be performed
at REX-ISOLDE, the preparatory reaction 10 Be( 26 Mg, 28 Mg) 8 Be
has been studied at the MINIBALL γ-spectrometer in Cologne. For a
better understanding theoretical DWBA-calculations using the Coupled-
Channel Code FRESCO [1] have been performed. *Supported by DFG
under contract number HA 1101/6-3
[1] I.J. Thompson, Comp. Phys. Rep. 7 (1987) pp 167-212
HK 10.22 Tue 13:30 Foyer
Partial wave analysis of the one and two neutral meson photoproduction
data — •Alexey Anisovich for the Crystal Barrel
collaboration at ELSA collaboration — Nusallee 14-16, 53115, Bonn
Data on photoproduction of one and two neutral mesons have been
taken recently by the Crystal Barrel collaboration at ELSA. The combined
partial wave analysis of these data was performed using extended
Rarita-Schwinger formalism. The first results of this analysis are discussed.
HK 10.23 Tue 13:30 Foyer
Nuclear Structure of 193 Os: Transfer Experiment and IBMrelated
Model — •Y. Eisermann 1 , R. Hertenberger 1 , H-F.
Wirth 1 , G. Graw 1 , S. Christen 2 , O. Möller 2 , J. Jolie 2 , J.
Barea 3 , C. E. Alonso 4 , and P. Arias 4 — 1 Sektion Physik, LMU
München — 2 IKP, Universität zu Köln — 3 Universidad Nacional Autonoma
de Mexico — 4 FAMN, Universidad de Sevilla
193 Os is the heaviest Osmium isotop accessible by one neutron transfer
reaction. Data from ( � d,p) experiments with high resolution at the Munich
Q3D spectrograph provide new information on the nuclear structure
of this odd-even nucleus. Our Atomic beam source with cesium charge
exchange produces a polarized beam which hits the target of highly enriched
192 Os. Spin, parity and spectroscopic factors of levels with excitation
energies up to 1.7MeV are deduced from the angular distributions
of the ( � d,p) reaction. We compare the lower lying negative parity states
with IBFM-2 and SUSY model calculations.
The level scheme given by a SUSY approach approximately resembles the
experimental data. The IBFM-2 calculation reproduces the lower lying
nuclear excited states quite well. The work was supported by the DFG
(C4-Gr894/2-3) and MLL.
HK 10.24 Tue 13:30 Foyer
Signature inversion in the semidecoupled πh9�2 ⊗ νi13�2 band
of the odd-odd nucleus 172 Lu — •Ts. Venkova 1,2 , R.M. Lieder 1 ,
W. Gast 1 , D. Bazzacco 3 , G. de Angelis 4 , E.O. Lieder 1 , H.M.
Jäger 1 , L. Mihailescu 1 , R. Menegazzo 3 , S. Lunardi 3 , C. Rossi
Alvarez 3 , C. Ur 3 , D.R. Napoli 4 , W. Urban 5 , and T. Rza¸ca-
Urban 5 — 1 IKP, FZ Jülich, D-52425 Jülich — 2 INRNE, BAS, BG-1784
Sofia — 3 INFN, Sezione di Padova, I-35131 Padova — 4 INFN, LNL,
I-35020 Legnaro — 5 IEP, Univ. Warsaw, PL-00-681 Warsaw
High-spin states in the odd-odd nucleus 172 Lu have been populated
in a 170 Er( 7 Li,5n) reaction at 51 MeV and the emitted γ-radiation was
detected with the GASP array. A new semidecoupled band with the
proposed π1/2 − [541]⊗ν7/2 + [633] configuration has been established exhibiting
a signature inversion up to the highest observed spin, since contrary
to expectation, the states with the signature α = 0 lie lower in
energy than the α = 1 levels.
From a systematics of the inversion spin, at which the signature splitting
reverts to the normal order, for πh9/2⊗νi13/2 bands of odd-odd nuclei
with 69 ≤ Z ≤ 79 and 93 ≤ N ≤ 105 it was found that the inversion spin
is fairly constant for nuclei with the same N − Z, that for an isotopic
chain the inversion spin increases with increasing neutron number N and
that for an isotonic chain, the inversion point decreases with increasing
proton number Z.
The work was partly supported by the DFG under the grants 436 BUL
17/7/02 and 17/6/03 and by the EU contracts ERB-FMGEST-980110
and HPRI-CT-1999-00083.

Nuclear Physics Tuesday
HK 10.25 Tue 13:30 Foyer
Semiclassical Approach to describe the Competition between
Magnetic and Collective Rotation in Transitional Nuclei —
•A.A. Pasternak1,2 , R.M. Lieder1 , and E.O. Podsvirova1,2 —
1 2 IKP, FZ Jülich, D-52425 Jülich — A.F. Ioffe PTI, RU-194021 St. Petersburg
The enhancement of M1 transitions can be explained semiclassically
if high-j quasiparticles of angular momenta j1 and j2, respectively, are
aligned along the principal axes x and z. The case, when collective rotation
is absent, is referred to as magnetic rotation with shears effect. The
collective rotation has been included into this model in the framework of a
coupling scheme, when the angular momenta R and j1+j2 are parallel to
each other [1]. For transitional nuclei, where the deformation is not small,
the shears mechanism can be combined with the PAC coupling scheme
where the rotational angular momentum R is parallel to the symmetry
axis (SPAC approach). The total energy contains collective and quasiparticle
contributions: E(I, θ1, θ2) = 1/(2J ) R2 (I,θ1, θ2) + V2P2(θ1 − θ2),
where P2 is a Legendre polynomial and R is determined geometrically.
For each value of I the angles θ1 and θ2 can be found by the minimization
of the total energy E. Subsequently, the transition probabilities B(M1)
and B(E2) can be expressed as functions of I. The SPAC approach
allows to describe the experimental data for dipole bands in 142Gd and
141Eu including the bandcrossing.
[1] R.M. Clark et al., Ann. Rev. Nucl. Part. Sci. 50 (2000) 1
The work was partly supported by the German-Russian WTZ contract
RUS 99/191.
HK 10.26 Tue 13:30 Foyer
Response of the Spectators to the Participants Blast as a Probe
of the Momentum-Dependent Nuclear Mean Field — •Vladimir
Henzl 1 , M.V. Ricciardi 1 , T. Enqvist 1,2 , L. Audouin 3 , J. Benlliure
4 , M. Bernas 3 , E. Casarejos 4 , B. Fernandez 4 , A. Kelic 1 , P.
Napolitani 1 , J. Pereira 4 , K.-H. Schmidt 1 , and J. Taieb 3 — 1 GSI,
Darmstadt, Germany — 2 University of Jyvaskyla, Finland — 3 Institut
de Physique Nucleaire, France — 4 University of Santiago de Compostela,
Spain
According to recent theoretical work [Shi et al.], the response of the
spectators to the participants blast can result in a gain of the residue longitudinal
momenta such that the mean spectator-like residue velocities
can exceed the velocity of the original projectile. Such re-acceleration effect
is predicted to exhibit sensitivity to the momentum-dependent properties
of the nuclear mean field and at the same time stay almost unaffected
by the stiffness of the nuclear matter. In this contribution, the
influence of the projectile energy and the mass of the colliding nuclei on
the strength of the re-acceleration of the final residues is discussed. We
present the momentum distributions of the projectile fragments formed
in the reactions 208Pb+Ti at 0.5 and 1.0 A GeV, and 238U+Pb,Ti at
1 A GeV measured with the high-resolution magnetic spectrometer FRS
at GSI-Darmstadt.
HK 11 Poster Session: Electromagnetic and Hadronic Probes
Time: Tuesday 13:30–15:30 Room: Foyer
HK 11.1 Tue 13:30 Foyer
Electromagnetic Form Factors of the Nucleon — •Alexander
Lenz, Vladimir Braun, Nils Mahnke, Eckart Stein, and
Markus Wittmann — Fakultät für Physik Universität Regensburg
D-93040 Regensburg
We calculate the electromagnetic form factors of the nucleon in the
framework of Light-cone sum rules to leading order in QCD. Our results
are compared with the experimental data in the range 1 < Q 2 < 5 GeV 2 .
HK 11.2 Tue 13:30 Foyer
Charmonium photoproduction. — •Alexander Sibirtsev 1 ,
Siegfried Krewald 1 , and Anthony W. Thomas 2 — 1 IKP-TH,
FZJ, Juelich. — 2 Adelaide University
The available data on J/Ψ photoproduction are analyzed in terms of
pomeron exchange, two gluon exchange and photon-gluon fusion models.
Allowing the pomeron-quark interaction to be flavour dependent and
introducing the soft and hard pomerons it is possible to reproduce the
data at √ s>10 GeV and small |t|. The two gluon exchange calculations
indicate strong sensitivity to the gluon distribution function. The results
obtained with the most modern MRST2001 and DL PDF reproduce the
forward J/Ψ photoproduction cross section at √ s>10 GeV. The calculations
with the photon-gluon fusion model and with MRST2001 and DL
PDF are also in reasonable agreement with the data on the total J/Ψ
photoproduction cross section. However none of the models describe the
data at √ s

Nuclear Physics Tuesday
can be expected with new results from COSY at energies close to the reaction
threshold. This new measurements are proposed by the COSY-11
Collaboration.
HK 11.6 Tue 13:30 Foyer
Photoproduction of η ′ -mesons from the proton. — •Alexander
Sibirtsev 1 , Siegfried Krewald 1 , and Charlotte Elster 2 —
1 IKP-TH, FZJ, Juelich. — 2 Ohio University
The presently available data for the reaction γp→η ′ p are analyzed in
terms of a model in which the dominant production mechanism is the
exchange of the vector mesons, ω and ρ. To describe the data at photon
energies close to the production threshold we introduce a resonance
contribution due to the well established S11(1535) resonance. Finally we
study the contributions due to nucleon exchange to the η ′ photoproduction
and find, that those contributions can be seen at large angles in the
differential cross section.
The preliminary data from CLAS Collaboration at Jefferson Lab are in
good agreement with our predictions. Further progress in understanding
the η ′ photoproduction is expected from future studies by CB-TAPS at
ELSA and polarization measurements at JLab.
HK 11.7 Tue 13:30 Foyer
On the nature of the light scalar mesons — •Christoph
Hanhart 1 , Johann Haidenbauer 1 , Vadim Baru 1,2 , Yulia
Kalashnikova 2 , and Alexander Kudryavtsev 2 — 1 Institut
für Kernphysik, Forschungszentrum Jülich GmbH, D–52425 Jülich,
Germany — 2 Institute of Theoretical and Experimental Physics,
117259, B. Cheremushkinskaya 25, Moscow, Russia
Almost since their discovery there is a heated debate in the physics
community about what is the nature of the lightest scalar mesons, in
particular the a0(980) and the f0(980). Some say, they are normal ¯qq
states, some say they are compact four quark states and some say they
are of molecular type. Recently efforts increased to identify observables
that might be decisive on model independent grounds to resolve this
fundamental issue. In the poster our recent efforts in this direction are
presented, based on the generalization of a formalism by S. Weinberg.
The effective couplings of resonance states to the continuum were identified
as the central quantities of the analysis. Some comments are made
on why these quantities are so badly known for the a0 and the f0.
HK 11.8 Tue 13:30 Foyer
Extraction of the hyperon-nucleon scattering lengths from production
reactions — •Achot Gasparyan 1,2 , Johann Haidenbauer
1 , Christoph Hanhart 1 , and Joseph Speth 1 — 1 IKP-Th,
Forschungszentrum Jülich, 52428 Jülich — 2 Institute for Theoretical and
Experimental Physics, Moscow, Russia
A model independent analysis of the hyperon-nucleon final state interaction
in large momentum transfer reactions like pp → K + pΛ or
γd → K + nΛ is performed in the framework of the dispersion relations
technic. The relation between the spin singlet and spin triplet Y N scattering
lengths and the corresponding spin dependent production cross
sections is obtained. It is shown that the two possible spin states in the
produced Y N system can be disentangled by means of polarization experiments.
The feasibility of the method is tested through the analysis of
the SATURN data on pp → K + pY differential cross section. The theoretical
and experimental uncertainties of the extracted scattering lengths
are estimated.
HK 11.9 Tue 13:30 Foyer
Charge symmetry breaking as a probe for the real part of η–
nucleus scattering lengths — •Vadim Baru 1 , Johann Haidenbauer
1 , Christoph Hanhart 1 , and Jouni Niskanen 2 — 1 IKP-Th,
FZ Jülich, 52425 Jülicj — 2 Department of Physical Sciences, University
of Helsinki
On the example of the reactions pd → 3 Hπ + / 3 Heπ 0 we demonstrate
that one can use the occurrence of charge symmetry breaking as a tool
to explore the η–nucleus interaction near the η threshold [1]. Based on
indications that the cross section ratio of π + and π 0 production on nuclei
deviates from the isotopic value in the vicinity of the η production threshold
we argue that a systematic study of this ratio as a function of the
energy would allow to pin down the sign of the real part of the η-nucleus
scattering length. The knowledge of this sign is important for drawing
conclusions about the possible existence of η-nucleus bound states.
[1] V. Baru, J. Haidenbauer, C. Hanhart and J. A. Niskanen, scattering
lengths,” Phys. Rev. C 68, 035203 (2003).
HK 11.10 Tue 13:30 Foyer
The ηN channel in the Jülich πN model — •Johann Haidenbauer
1 , Achot M. Gasparyan 2 , Christoph Hanhart 1 , and
Josef Speth 1 — 1 FZ Jülich, IKP, 52425 Jülich — 2 ITEP, 117258,
B.Cheremushkinskaya 25, Moscow, Russia
The reaction πN → ηN at the ηN threshold is closely related to the
properties of the S11(1535) resonance. In the previous version of the
Jülich πN model [1] the near-threshold π − p → ηn cross section was
overestimated by about 20-30% at the position of the peak. The reason
for this deficiency is that only the πN and ηN channels were allowed to
couple to the N ∗ (1535) resonance.
Recently we presented an improved model of the πN interaction [2].
Specifically, we introduced now a coupling of the π∆ channel to the
N ∗ (1535) resonance. This allowed a simultanous description of the total
π − p → ηn cross section and the inelasticity in the S11 partial wave in
the resonance region. We also achieved a much better description of the
reaction πN → ηN at higher energies. We will report corresponding
results at this meeting.
[1] O. Krehl et al., Phys. Rev. C 62, 025207 (2000).
[2] A.M. Gasparyan et al., Phys. Rev. C 68, 045207 (2003).
HK 11.11 Tue 13:30 Foyer
Spin-dependence of Meson Production in Nucleon-Nucleon Collisions
— •P. N. Deepak 1 , G. Ramachandran 2 , M. S. Vidya 3 ,
and C. Hanhart 1 — 1 Institut für Kernphysik, Forschungszentrum
Jülich, D-52425 Jülich — 2 Indian Institute of Astrophysics, Bangalore-
560 034, India — 3 School of Physical Sciences, Jawaharlal Nehru University,
New Delhi-110 067, India
The dynamics of the reaction NN → NNπ, near threshold, is closely
linked to NN scattering as it is the lowest inelastic channel in NN collisions.
In this light, it is puzzling that although the NN interaction is
believed to be well understood phenomenologically, there is currently no
theoretical explanation for the wealth of polarization data available for
NN → NNπ. To find the missing physics, a partial-wave analysis of the
data is mandatory.
To carry out this program, we employ a model-independent irreducible
tensor approach to NN → NNπ developed by Ramachandran et al.,
which leads to a spin-structure of the T-matrix valid at all energies together
with exact partial-wave expansions for the reaction amplitudes.
Further, in contrast to the earlier theoretical work of Bilenky and Ryndin,
leading to expressions for the singlet and triplet total cross sections,
channel-spin cross sections are defined at the differential level itself and
their empirical determination from appropriate measurements using polarized
beams and targets are indicated. Values for the singlet and triplet
differential cross sections based on the recent data from IUCF are also
presented here. The above formalism applies equally well to the production
of pseudoscalar mesons like η, η ′ , presently of interest to COSY.
HK 11.12 Tue 13:30 Foyer
Total cross section for η production in the quasi-free pn → pnη
reaction — •M. Janusz for the COSY-11 collaboration — Institute of
Physics, Jagellonian University, Cracow, PL-30-059, Poland
The comparison of the total cross sections for the η and η ′ meson production
in the p-n and p-p collisions may be a proper tool in studying
structure and production mechanism of both mesons.
The value of the total cross section for the reaction pp → ppη was
found to be about 6.5 times smaller than that for the pn → pnη rection
[1] which is explained by a dominant isovector meson (π, ρ) exchange.
The corresponding ratio for the η ′ production will yield information of
the underlying reaction mechanisms which are mediated by the η ′ structure.
A feasibility study of the quasi-free pn → pnη reaction has been
carried out at the COSY-11 facility at the cooler synchrotron COSY in
Jülich using a proton beam scattered at a deuteron cluster target [2]. The
data are still under evaluation but clearly demonstrate the possibility to
reconstruct quasi-free pn reactions at COSY-11. Similar investigations
for the production of the η ′ meson have started. First measurements have
been performed and a production run is scheduled for summer 2004 [3].
The detection capabilities of the quasi-free pn → pnη(η ′ ) reaction at
COSY-11 as well as preliminary results in the η channel will be presented.
[1] H. Calén et al., Phys. Rev. C 58 (1998) 2667.
[2] P. Moskal et al., nucl-ex/0311003.
[3] P. Moskal, COSY Proposal No.133.
Supported by Forschungszentrum Jülich.

Nuclear Physics Tuesday
HK 11.13 Tue 13:30 Foyer
Study of the Bremsstrahlung radiation in the quasi-free np → np
γ reaction — •Joanna Przerwa for the COSY-11 collaboration —
Institute of Physics, Jagellonian University, Cracow, PL-30-059 Poland
Using a deuteron beam and a proton target the quasi-free np → np
γ reaction has been studied at the COSY-11 facility, an internal magnetic
spectrometer system at the cooler synchrotron COSY in Jülich.
Data have been taken at a beam momentum of 3.165 GeV/c close to the
threshold of the dp → dp η process. Events corresponding to the dp → p
n γ ps reaction have been identified by measuring the outgoing charged
as well as neutron ejectiles. The fast protons are detected by means of
drift chambers and scintillator hodoscopes and the slow spectator protons
are measured in a Si-pad arrangement close to the target. Neutrons
and photons are registered in a scintillator/lead sandwich detector. The
momentum vectors of the protons are reconstructed by tracking back
the trajectories to the target point and the momentum of the neutron
is calculated from the time-of-flight between target and neutron detector.
For the calibration of the neutron detector the produced photons
are used. The efficiency is determined by Monte Carlo studies supported
by calibration measurements performed simultaneously to other reaction
studies by selecting special reaction channels relevant for the neutron
detector.
Results of the data analysis and the experimental techniques will be
presented and discussed.
Supported by Forschungszentrum Jülich.
HK 11.14 Tue 13:30 Foyer
Study of the d−η interaction via dp → dpη reaction — •C. Piskor-
Ignatowicz for the COSY-11 collaboration — Institute of Physics, Jagellonian
University, Cracow, PL-30-059 Poland
Recently the deuteron-η interaction was intensively studied on theoretical
ground. This topic is of special interest due to the possible existence
of η-nucleus bound or quasibound states. The COSY-11 collaboration
preformed measurements of the near-threshold η meson production in
the dp → dpη reaction. The aim of the experiment was the investigation
of the d−η interaction by studying the energy dependence of the total reaction
cross section as well as Dalitz plot distributions for the final state
particles. Measurements were preformed for four excess energies in the
range from 0.2 MeV to 9.6 MeV. The momenta of the outgoing protons
and deuterons were registered with the COSY-11 detection system and
the η-mesons were identified via the missing mass method. Preliminary
results of these measurements will be presented.
Supported by Forschungszentrum Jülich.
HK 11.15 Tue 13:30 Foyer
Threshold Production of Σ + at COSY-11 — •T. Ro˙zek for the
COSY-11 collaboration — Institue of physics, Silesian University Katowice,
IKP Forschungszentrum Jülich
At the cooler synchrotron COSY the threshold production of hyperons
has been studied via the pp → pK + Λ(Σ 0 ) reaction [1] resulting in a
cross section ratio R = σ(Λ)/σ(Σ 0 ) of about 28 which exceeds the ratio
at high energies by an order of magnitude. Possible explanations within
different models are proposed [2] but a definite conclusion is up to now
not possible. Further studies in other isospin channels like the Σ + production
will help in the clarification of the relevant dominant reaction
mechanisms.
The Σ + production was measured at the COSY-11 installation via the
pp → nK + Σ + reaction at Q = 13 MeV and Q = 60 MeV. COSY-11 is
an internal magnetic spectrometer experiment at the COoler SYnchroton
and storage ring COSY in Jülich. It is equipped with scintillator
hodoscopes and drift chambers for charged particle detection and a scintillator/lead
sandwich detector for neutrons.
The status of the current analysis will be presented and discussed.
[1] J.T.Balewski et al.,PLB420(1998) 211, S. Sewerin et al.,PRL 83 (1999)
682., P. Kowina, PhD thesis 2002.
[2] A. Gasparian et al., PLB 480 (2000) 273, NPA684:397,2001, R. Shyam
et al., PRC63 (2001) 022202, A. Sibirtsev et al. NPA646 (1999) 427, nuclth/0004022
v2 (2000).
Supported by Forschungszentrum Jülich.
HK 11.16 Tue 13:30 Foyer
The ANKE Silicon Tracking Telescopes as a tool for Polarimetry
and Luminosity Determination — •A. Mussgiller for the
ANKE collaboration — Institut für Kernphysik, Forschungszentrum
Jülich, Germany
The first two ANKE Silicon Spectator Tracking Telescopes have been
installed several centimeter close to the COSY beam inside the accelerator
vacuum. Their design is optimized for identification and tracking of
low energy spectator protons emitted from an internal deuterium target.
In addition, the large acceptance at large scattering angles, allows to extend
the ANKE capabilities to study pp- and pd-elastic reactions and
to cross-check the obtained data, detecting both particles. The pp-free
and quasi-free reaction is an appropriate tool to determine the luminosity
over the complete COSY energy range. Moreover, it seems to be
well-suited as a beam-polarimeter. This technique is exploited together
with the possibilities offered by the acceleration of polarized deuterons
at COSY, to measure the � dp → (pp)1 S0 n charge–exchange reaction near
the forward direction.
This work is supported by the FZJ.
HK 11.17 Tue 13:30 Foyer
Strangeness production in proton - nucleus interactions at
ANKE/COSY — •Y. Valdau for the ANKE collaboration —
Forschungszentrum Jülich, 52425 Jülich
ANKE is a magnetic spectrometer and detection system at an internal
target position of COSY-Jülich. The device permits to momentum
analyze ejectiles from hadronic interactions with forward emission angles
around 0 ◦ . A major goal of the experimental program at ANKE
is the investigation of proton-induced strangeness production in the nuclear
medium. In a recent measurements the production of K + -mesons
accompanied by protons or deuteron has been investigated at different
beam energies Tp = 1.0, 2.0, 2.3 GeV. These data may shed light on the
reaction mechanism leading to kaon production in nuclei. Particularly,
they supply direct evidence for the two-step reaction mechanism, with
formation of intermediate pions, leading to kaon production. In addition,
measurements with a deuterium target suggest that production cross section
on neutron exceeds that on proton, and the corresponding ratio is
close to 4. Supported by FZJ, WTZ, DFG.
HK 11.18 Tue 13:30 Foyer
Investigation of the Scalar Resonance a + 0 (980) at ANKE ∗ — •V.
Kleber for the ANKE collaboration — Institut für Kernphysik, Universität
zu Köln, 50937 Köln / Forschungszentrum Jülich, 52425 Jülich
The scalar resonances a0/f0(980) have been observed in many experiments.
However, their nature is not yet understood and they are interpreted,
e.g., as genuine mesons (and thus members of the scalar nonet),
K ¯K molecules or compact qq–¯q¯q states. At COSY–Jülich an experimental
program has been started, using the ANKE spectrometer, which aims
at exclusive data on a0/f0 production from pp, pn, pd and dd interactions
close to the K ¯ K threshold. The final goal will be the extraction
of the charge-symmetry breaking a0/f0 mixing amplitude to shed light
on the nature of the light scalar resonances. Here, we report about
the first exclusive study of the reactions pp→dK + ¯ K 0 and pp→dπ + η.
The measurements were performed at beam energies of Tp=2.65 and
2.83GeV, corresponding to excess energies of 46 and 103MeV above the
K ¯ K threshold. From the measurement at the lower energy the total cross
section of the reaction pp→dK + ¯ K 0 as well as differential distributions
have been extracted. The main contribution to this reaction is interpreted
as a0→K + ¯ K 0 decays. The large background contribution from
multiple-pion production to the reaction pp→dπ + η makes the analysis
more complex than in the case of kaon production. The data at the
higher energies are still under analysis, and the current status will be
presented. ∗ supported by FZJ, BMBF and DPG

Nuclear Physics Tuesday
HK 11.19 Tue 13:30 Foyer
First Measurement of the Charge–Exchange np → pn Reaction
with Polarised Deuteron Beam at ANKE — D. Chiladze 1 , S.
Dymov 2 , R. Gebel 1 , V. Glagolev 2 , V. Hejny 1 , •A. Kacharava
3,4 , V. Komarov 2 , A. Kulikov 2 , N. Lang 5 , B. Lorentz 1 ,
G. Macharashvili 2,4 , R. Menke 5 , S. Mikirtytchiants 6 , A.
Mussgiller 1 , M. Nioradze 4 , F. Rathmann 1 , H. Rohdjes 7 , R.
Schleichert 1 , H. Ströher 1 , Yu. Uzikov 2,8 , S. Yaschenko 3,2 ,
C. Wilkin 9 , and A. Wronska 1 for the ANKE collaboration —
1 IKP, FZJ, Germany — 2 LNP, JINR, Dubna, Russia — 3 PI II, Univ.
Erlangen-Nürnberg, Germany — 4 HEPI TSU, Tbilisi, Georgia —
5 IKP, Univ. Münster, Germany — 6 PNPI, Gatchina, Russia — 7 ISKP,
Univ. Bonn, Germany — 8 KazNU, Almaty, Kazakhstan — 9 PD, Univ.
College, London, England
During our studies of the pd → n(pp) reaction at ANKE with neutron
emission in backward direction, we have measured two protons
at low relative momentum presumably in the 1 S0 final state. Consecutively,
this technique has been exploited together with the possibilities
offered by the acceleration of polarised deuterons at COSY, to measure
the � dp → (pp)1 S0 n charge–exchange reaction near the forward direction,
i.e. where the four–momentum transfer t between the proton and neutron
is small. our amplitude. Preliminary results of the first measurement of
the charge–exchange deuteron breakup reaction at Td = 1.2 GeV will be
presented. Results of a recent COSY beam polarimetry run will also be
discussed. This work is supported by the FZJ.
HK 11.20 Tue 13:30 Foyer
Investigation of the np interaction — •Hartmut Machner for
the GEM Collaboration collaboration — Inst. f. Kernphysik FZ Jülich
The np interaction was studied via its final state interaction in a reaction
pp → npπ + at an incident beam momentum of 1640 MeV/c. This is
a much higher momentum than previous studies. The pion was detected
in a high resolution experiment using the 3Q2D magnetic spectrograph
at COSY. Due to the high resolution and low background envirement the
range of the pp → dπ + and the pp → npπ + reactions were well separated.
Almost all of the data is due to spin-triplett interaction. An upper limit
for the spin-singulett fraction is given.
HK 11.21 Tue 13:30 Foyer
Study of the reaction np → ppπ− with a deuteron beam and
spectator tagging — •Eberhard Kuhlmann for the COSY-TOF
collaboration collaboration — IKTP, TU Dresden
Differential angular and momentum distributions for π− production in
np collisions have been measured by use of a d-beam at pd=1.85 GeV/c
with the COSY-TOF large acceptance spectrometer. By spectatorproton
tagging, the underlying Fermi momentum which differs from event
to event could be determined thus allowing a scan of a range of approximately
50 MeV above threshold at just one beam energy. The preliminary
results will be discussed in comparison with neighboring single-pion producing
reactions such as pp → ppπ0 and pp → pnπ + , a decomposition in
terms of the isospin dependent partial cross sections σIi,If will be given.
Supported by BMBF and FZ Jülich
HK 11.22 Tue 13:30 Foyer
Single-Pion Production at Tp = 400 MeV Measured at COSY-
TOF ∗ — •E. Doroshkevich, H. Clement, A. Erhardt, J. Kress,
R. Meier, and G.J. Wagner for the COSY-TOF collaboration —
Physikalisches Institut, Universität Tübingen
The single-pion production channels pp → dπ + , pp → pnπ + and
pp → ppπ 0 have been measured exclusively at COSY at an incident
proton energy of Tp = 400 MeV. For maximum coverage of the phase
space of these reactions and minimum contributions from pion decay in
flight the TOF spectrometer has been used in its short version. Track
reconstruction is achieved by pixel informations from start, fiber, quirl
and ring hodoscopes. Particle identification and particle kinetic energies
have been obtained for particles detected in the central calorimeter.
For particles detected at larger angles in the ring hodoscope the time-offlight
information has been utilized for the determination of their kinetic
energy. This way the full event information is obtained with 4 overconstraints
in case of the dπ + channel and 1 overconstraint in case of ppπ 0
and pnπ + channels. For dπ + the resulting angular distributions agree
well with SAID. For the other channels our results are compared to data
from previous experiments.
∗ supported by BMBF (06 TU 201), DFG (Europäisches Graduiertenkolleg)
and FZ Jülich (FFE)
HK 11.23 Tue 13:30 Foyer
Total cross section of the π − p → π 0 n charge exchange reaction —
•J. Breitschopf 1 , H. Clement 1 , M. Cröni 1 , H. Denz 1 , E. Friedman
2 , E. Gibson 3 , P. Jesinger 1 , R. Meier 1 , and G. J. Wagner 1
— 1 Physikalisches Institut, Universität Tübingen — 2 Racah Institute of
Physics, The Hebrew University, Jerusalem, Israel — 3 California State
University, Sacramento, USA
The origin of isospin violation in the strong interaction is the mass
difference of the up- and down-quarks. Pion-nucleon elastic scattering
and single charge exchange (SCX) offers access to the amount of isospin
breaking. Recent analyses of existing data have found unexpectedly large
(7%) violations for pion energies around 50 MeV. However, these analyses
are probably affected by the limited SCX data base.
Therefore, at PSI we have measured total π − p → π 0 n cross sections
for energies between 30 and 250 MeV aiming at an accuracy of 1-2%.
We used a 4π scintillator box to measure the transmission of negatively
charged pions through accurately manufactured CH2 and C targets of
about 4 mm thickness. The difference of the transmissions corresponds
to reactions on hydrogen with outgoing neutral particles and yields the
SCX cross sections. Non-vanishing detector sensitivities for photons and
neutrons, effects of detector geometry, radiative pion capture pion decay
etc lead to corrections of up to 8%. These were determined by extensive
Monte Carlo simulations. Data were recorded event by event yielding
about 2.5 TB of data. Detector, data taking procedure, status of the
analysis and preliminary results will be presented.
This work is supported by BMBF (06TÜ987I)and DFG (GRK683).
HK 11.24 Tue 13:30 Foyer
Measurement of elastic π ± p cross sections with CHAOS at
low energy — •Holger Denz, Johannes Breitschopf, Heinz
Clement, Rudolf Meier, Florian von Wrochem, and Gerhard
J. Wagner for the CHAOS collaboration — Universität Tübingen,
Physikalisches Institut, Auf der Morgenstelle 14, 72076 Tübingen, Germany
From π ± p scattering data the πp sigma term can be extracted by phase
shift analyses. This quantity is a measure of explicit breaking of chiral
symmetry due to non-vanishing current quark masses. Recent analyses
of πp data found very high values for the sigma term which lead to problems
with the interpretation. A possible explanation for the high values
could be the scarce and contradictory πN data base at low energies. Our
program of measurements of cross section and polarisation observables
aims at resolving these problems.
Differential cross sections in elastic π ± p scattering were measured for
incident pion energies between 20 and 67 MeV using the CHAOS spectrometer
at TRIUMF. In addition to the conventional detector setup a
range telescope was placed in the forward scattering region to suppress
the decay background which poses a major problem at low energies. This
experiment provides a set of data measured simultanously over a large
angular range and covering a wide energy range. The experimental setup,
analysis and results for incident pion energies between 20 and 45 MeV
will be discussed. This work is supported by BMBF(06TÜ987I) and
DFG(GRK683).
HK 11.25 Tue 13:30 Foyer
Investigation of the η → π 0 γγ decay — •Raghava Varma 1,2 and
Ankhi Roy 1,2 for the CBELSA/TAPS collaboration — 1 II. Physikalisches
Institut, Justus-Liebig-Universityät Gießen — 2 Indian Institute of
Technology,Bombay
In this poster, we present the investigation of the reaction η → π ◦ γγ.
The PDG assigns a width of 0.84±0.18 eV to this decay, based on
GAMS2000 measurements Chiral perturbation theory (ChPT) calculations
are problematic and underpredict the branching ratio for this decay.
Recently, Oset et al. have taken a coherent sum of VMD and ChPT and
have come up with a width of 0.47±0.10 eV which is in clear disagreement
with published results but in remarkable agreement with recent
experiment by the Crystal Ball group which also do not agree with earlier
measurements. These calculations crucially depend on the shape of
invariant mass of the two bachelor photons. To resolve the experimental
discrepancy as well as to test the theory we have remeasured the width
of this rare decay using tagged Bresstrahlung photons from 3.2 GeV electrons
from ELSA@Bonn. A 5cm long LH2 was used as a target. The
experiment has been performed using an almost full 4π setup combining
the Crystal Barrel with TAPS forming the forward wall. The analysis is
going on. It involves eliminating the background consisting of η → 3π ◦

Nuclear Physics Tuesday
(where two clusters overlap) and kinematically identical pγ → pπ ◦ π ◦
events. The results of the anaysis would be presented at the conference.
HK 11.26 Tue 13:30 Foyer
Measurement of the reaction gamma proton –¿ K+ pi+ Sigmafor
photon energies up to 2.65 GeV with SAPHIR at ELSA —
•Inez Schulday for the SAPHIR-Kollaboration collaboration — Nussallee
12, 53115 Bonn
Results are presented for reaction cross section as a function of the
photon energy and the production of the resonances of Sigma(1385),
Lambda(1405) and Lambda(1520) in the energy range from the production
threshold up to 2.65 GeV. For Lambda(1520) production the dependence
on the four-momentum transfer squared and the decay angular
destributions are also presented.
HK 11.27 Tue 13:30 Foyer
Measurement of the reaction gamma proton –¿ K0 Sigma+ for
photon energies up to 2.65 GeV with SAPHIR at ELSA —
•Ralf Lawall for the SAPHIR-Kollaboration collaboration — Nussallee
12, 53115 Bonn
Results are presented for cross sections as a function of the photon
energy and the production angle in the CMS and for the polarization
of the Sigma+ in the energy range from the production threshold up to
2.65 GeV. The data are compared with other measurements and with
predictions of theoretical models.
HK 11.28 Tue 13:30 Foyer
η and η ′
photoproduction on deuteron — •Igal Jaeglé for
the CBELSA/TAPS collaboration — Universität Basel, CH-4056 Basel,
Klingelbergst. 82
The photoproduction of η and η ′
mesons on the deuteron has been measured
at the tagged photon beam of the Bonn ELSA accelerator with a
combined setup of the Crystal Ball and TAPS detectors, which formed
a 4π electromagnetic calorimeter. The mesons were detected in coincidence
with the (participant) recoil nucleons, so that the reactions on the
proton and on the neutron can be compared. For η - mesons previous
experiments have determined a neutron - proton cross section ratio of
2/3 in the excitation energy range of the S11(1535). Models predict a
strong rise of the ratio at higher energies due to the contribution from
other resonances. Angular distributions and photon beam asymetries
will be analysed in view of these effects. The measurement of η ′
production
is the first attempt to study this reaction on the neutron. It aims
furthermore at an investigation of the threshold behaviour (η ′
nucleon -
interaction) on the deuteron. First preliminary results will be discussed.
HK 11.29 Tue 13:30 Foyer
Perspectives of doublepolarization experiments — •Eric Gutz
for the CBELSA-TAPS collaboration — Helmholtz-Institut für Strahlenund
Kernphysik, Nussallee 14-16, 53115 Bonn
The CBELSA-TAPS experiment at the electron accelerator ELSA investigates
photoproduction of resonances off the nucleon. The usage of
linearly polarized photons as probes is a powerful tool for such research.
Experiments in this manner have been performed during the most recent
beamtimes. Preliminary results on photon asymmetries in the reaction
γp → pπ 0 η will be shown.
In future experiments with the CBELSA detector not only linearly but
also circularly polarized photons will be used as well as a longitudinally
polarized reaction target. This will lead to the first experimental data
taken with double polarization in an energy region above 2000 MeV.
Such experiments yield a great discovery potential especially concerning
the still unresolved questions regarding missing resonances and parity
doublets. States in this region might not be disentangled using only
photon polarization but seem to be very sensitive on double polarization
observables. Sensitivity studies on this topic will be presented.
Supported by DFG.
HK 11.30 Tue 13:30 Foyer
A fast and compact electromagnetic calorimeter for the
PANDA detctor — •Helena Nowak, Andrea Wilms, Bernd
Lewandowski, and Klaus Peters — Ruhr Universitaet Bochum
The status of the developement of the Electro-Magnetic Calorimeter
(EMC) for the PANDA-experiment (antiProton ANnihilation at DArmstadt)
will be presented.
Various crystal scintillator materials with different readout-detectors
are being investigated. The first results of test measurements to evaluate
the energy resolution and temperature dependence of the crystals and
the photo-detector properties will be presented. Also the results of first
irradiation-tests with protons will be shown.
HK 11.31 Tue 13:30 Foyer
Photo sensors for the PANDA electromagnetic calorimeter —
•Andrea Wilms — Inst. f. Experimental Physics I - Ruhr-University
Bochum
The Experiments planned for the PANDA 4π detector at the future
antiproton facility of GSI require an electromagnetic calorimeter of high
granularity and resolution to measure photons of several GeV down to 10
MeV energy. The choice of a suitable photo sensor for the detection of the
scintillation light is crucial to achieve the best possible energy resolution.
The CMS ECAL group and Hamamatsu have invested huge efforts in the
development of extremely reliable and robust large area Avalanche Photo
Diodes (APDs). This experience makes these APDs a natural choice for
the start of the R&D program. First results of testbeam measurements
with protons at KVI/Groningen are presented.
HK 11.32 Tue 13:30 Foyer
Crystal scintillators for the PANDA electromagnetic calorimeter
— •Bernd Lewandowski — Inst. f. Experimental Physics I -
Ruhr-University Bochum
PANDA is a 4π detector planned for the antiproton storage ring at
the proposed International Accelerator Facility for Beams of Ions and
Antiprotons at the GSI. Experiments forseen with the antiproton beam
of extremely high luminosity and excellent beam quality up to 15 GeV/c
beam momentum require an electromagnetic calorimeter of high granularity
and resolution to measure photons of several GeV down to 10 MeV
energy. The scintillator materials being investigated for this calorimeter
are BGO and new improved PbWO4 crystals. First results of testbeam
measurements with protons at KVI/Groningen are presented.
HK 11.33 Tue 13:30 Foyer
Study of proton polarimeter of BBS at KVI — •Hamid
Reza Amir-Ahmadi, A. van den Berg, R. Castelijns, E.
van Garderen, M. Hunyadi, M.A. de Huu, N. Kalantar-
Nayestanaki, M. Kiˇs, H. Löhner, M. Mahjour-Shafiei, S.V.
Shende, J. Messchendorp, and H.J. Wörtche — KVI, Groningen,
The Netherlands
In order to understand the effect of the three-body force, it is best
to study scattering observables in a three-body system, such as cross
sections, analyzing power, and spin-transfer coefficients. At KVI a program
has been set up to study all these observables. Recently, we have
done a part of an experiment, ( � d, �p) elastic scattering, with which we can
study the spin-transfer coefficients such as Ky′ y and (Ky′ xx − Ky′ yy ). The
polarization of the scattered proton is measured with the focal plane polarimeter
of the Big-Bite Spectrometer. To measure the polarization of
the outgoing proton, a calibration experiment using the (�p, �p) reaction
has been done. A polarized-proton beam of 190 MeV hits a CH2 target
and the outgoing proton of this primary reaction is subjected to a secondary
scattering from a Carbon sheet in the polarimeter. By calculating
the polarization of the protons emerging from the H(�p, �p) reaction, and
measuring the asymmetry of the reaction in the Carbon polarimeter, the
average analyzing power of the C(�p, p) reaction can be measured. By
changing the BBS angle, we measured the average analyzing power in
the energy range of 170 MeV down to 60 MeV. This way of using a spectrometer
for such an experiment is rather new. In this talk, the results
of the polarimeter calibration will be discussed.
HK 11.34 Tue 13:30 Foyer
Nucleon Polarizabilities from Low-Energy Compton Scattering ∗
— •O. Yevetska 1 , J. Ahrens 2 , V. Chizhov 3 , V. Iatsioura 3 , A.
Richter 1 , G. Schrieder 1 , L. Sergeev 3 , Yu. Smirenin 3 , and S.
Watzlawik 1 — 1 Institut für Kernphysik, TU Darmstadt, Germany —
2 Institut für Kernphysik, Johannes Gutenberg-Universität, Mainz, Germany
— 3 Petersburg Nuclear Physics Institute, Petersburg, Russia
At the superconducting Darmstadt electron linear accelerator
S-DALINAC an experiment is built up to measure the electric and magnetic
polarizability of the nucleon with low energy Compton scattering.
A new experimental method will be used for determination of the energy
dependence of the differential cross section of elastic γp scattering in a
model-independent way in the energy range of bremsstrahlung photons

Nuclear Physics Tuesday
of 20 - 120 MeV with a precision ≤ 1% in relative measurements.
A narrow collimated bremsstrahlung beam enters a high pressure
ionisation chamber filled with hydrogen (deuterium), which acts as
target as well as detector gas. Two large volume NaI-spectrometers
(10” × 14”), which will detect the Compton scattered photons under
two different angles (90 ◦ and 130 ◦ ) serve as triggers for a coincident
measurement of the energy and the angle of the recoiled nucleons in the
ionisation chamber.
Recent results and the current status of the experiment will be presented.
∗ Supported by the DFG (FOR 272/2-2 and SFB 634).
HK 11.35 Tue 13:30 Foyer
Tests and performance of the new readout electronics for the
Crystal Ball detector at MAMI — •S. Schumann, R. Beck, D.
Krambrich, and M. Unverzagt for the A2-Collaboration collaboration
— Institut für Kernphysik, Universität Mainz, Mainz, Germany
A new experimental program is about to get underway at the Mainz
Microtron (MAMI). The experimental apparatus consists of the famous
Crystal Ball together with the TAPS detector as a forward wall, and a
central tracker. The setup will be equipped with a polarized frozen-spin
target to perform high precision, high statistics measurements of neutral
meson production. To handle the high event rates, new trigger and
readout electronics had to installed. Tests and performance of this new
electronic equipment will be presented.
HK 11.36 Tue 13:30 Foyer
Study of the parity violation in the delta region — •Luigi
Capozza — Institut für Kernphysik, Johannes-Gutenberg-Universität
Mainz, 55099 Mainz
A measurement of the parity violation asymmetry in electron-proton
scattering using a polarized electron beam is performed at MAMI. So far
the asymmetry has been fully extracted and interpreted for the elastic
part of the observed spectrum.
With the same apparatus, inelastic processes are recorded in parallel to
the elastic scattering events. Contributions to the inelastic spectrum
arise from processes such as resonance excitation, pion production and
other processes. In order to study parity violation in inelastic processes
in the observed spectrum, it is important to recognize which phenomena
are responsible for the experimental spectrum and with which magnitude.
The aim of this work is a simulation including all relevant processes in
order to extract an estimate of the parity violation asymmertry in the
delta region.
HK 11.37 Tue 13:30 Foyer
Performance of scintillating fibre detectors at the COMPASS-
Experiment ∗ — •Andreas Teufel 1 , Jens Bisplinghoff 2 , Dieter
Eversheim 2 , Wolfgang Eyrich 1 , Rainer Joosten 2 , Ole Nähle 2 ,
Friedrich Stinzing 1 , Marc Wagner 1 , Richard Webb 1 , and Ralf
Ziegler 2 for the COMPASS collaboration — 1 Physikalisches Institut
der Universität Erlangen-Nürnberg, D-91058 Erlangen — 2 Helmholtz Institut
für Strahlen- und Kernphysik der Universität Bonn, D-53115 Bonn
For track reconstruction of scattered muons in the central beam region
of the COMPASS Experiment, detectors with excellent time resolution
as well as high efficiency and rate capability are needed. Therefore, scintillating
fibre hodoscopes have been developed and implemented in the
COMPASS spectrometer. All requirements, e.g. time resolution σ ∼
400ps, space resolution σ ≤ 300 µm and efficiency > 99% could be fullfilled
at the nominal beam rate of 10 6 µ/s·mm 2 . The usage of a double
threshold discriminator system allows the observation and controlling of
signal height stability and improves the time resolution of the system.
Performance studies of these scintillating fibre detectors based on COM-
PASS data, taken in the years 2002 and 2003, are presented. The status
of an upgrade of the COMPASS Beam Momentum Station with scintillating
fibre hodoscopes is discussed.
∗ Supported by BMBF
HK 11.38 Tue 13:30 Foyer
Measurement of the Lambda Polarisation in the COMPASS
Experiment — •B. Grube, M. Wiesmann, M. Becker, R. de
Masi, J. Friedrich, A.-M. Fuchs, S. Gerassimov, B. Ketzer,
I. Konorov, R. Kuhn, S. Paul, L. Schmitt, and Q. Weitzel for
the COMPASS collaboration — TU München, Physik Department E18
We present first results on transverse Lambda polarization from the
2002 COMPASS run at the CERN SPS. With the 160 GeV polarized
muon beam on a polarized LiD target, Lambda and Antilambda production
was observed with quasi-real photons (Q 2 < 0.5 GeV 2 ).
A measurement of transverse Lambda and Antilambda polarization
was performed using the bias-cancelling method in order to minimize
systematic effects. The polarization is studied in dependence on the
kinematic variables xF and pt.
This work is supported by the BMBF and the Maier-Leibnitz-Labor,
Garching.
HK 11.39 Tue 13:30 Foyer
Search for Rare Charmless Hadronic B Meson Decays —
•Stephan Otto for the BABAR collaboration — Institute of Nuclear
and Particle Physics, TU Dresden, 01062 Dresden
Since 1999, the BABAR B meson factory at the asymmetric electronpositron
collider PEP-II at the Stanford Linear Accelerator Center has
collected more than 140 × 10 6 B ¯B meson pairs. This amount of data
enables us to investigate B meson decays with expected branching fractions
even smaller than 10 −6 . Of particular interest are b → d and b → s
quark transitions, exclusively described by “penguin” topology diagrams,
which have strong impact on CP asymmetries and are also sensitive to
new physics. We present a search for resulting decays such as B 0 → φη,
B 0 → φπ 0 , B 0 → φρ 0 and B 0 → φω, based on a data sample of 80 fb −1
and applying a “blinded” analysis strategy.
HK 12 Poster Session: Instrumentation and Applications
Time: Tuesday 13:30–15:30 Room: Foyer
HK 12.1 Tue 13:30 Foyer
Upgrade of the High-Resolution Energy-Loss Electron Scattering
Spectrometer at the S-DALINAC ∗ — •O. Burda, J. Enders,
A. Lenhardt, P. von Neumann-Cosel, M. Platz, A. Richter,
and S. Watzlawik — Institut für Kernphysik, Technische Universität
Darmstadt, Germany
The 169 ◦ Energy-Loss Spectrometer at the S-DALINAC is used for
high resolution electron scattering experiments. The spectrometer and
its detector system in particular has undergone a complete redesign. The
new detector system is now based on semiconductor microstrip detectors
which deliver a high resolution defined only by the geometric configuration
of the strip size. A new data acquisition system was developed
which using highly sophisticated technologies like FPGAs, CPLDs and
Embedded Systems. Here, the sequencer is synthesized in the CPLD
while the memory management, discriminator and counting units make
use of the FPGA. A RISK based Controller provides the interface be-
tween the FPGA, the CPLD and the data transmission path. The data
transmission path itself is realized with well-known ethernet technologies
and therefore allows to use standard user frontends for data processing.
Browsers, for example, gives the possibility to observe the spectra online.
With this setup, it is possible to carry out scattering experiments with a
momentum resolution of ∆p/p = 3×10 −4 and event rates up to 160 kHz
at a detection efficiency close to 100%.
∗ Supported by the DFG under contract SFB 634.
HK 12.2 Tue 13:30 Foyer
A Measurement System for Channeling Radiation at High
Charge Densities ∗ — •W. Bayer, H. Genz, A. Richter, and A.
Zilges — Institut für Kernphysik, Technische Universität Darmstadt,
Darmstadt, Germany
The objective of the project is to investigate if channeling radiation
(CR) can be produced in crystals by high electron bunch charges, a

Nuclear Physics Tuesday
topic of crucial importance in the realm of plasma acceleration [1]. It
has been suggested to use channeling in solid state plasma acceleration
in order to minimize beam spread [2]. So far, CR has been investigated
in detail mainly for Si crystals [3,4]. Since diamond crystals may
be even more suitable the current project is using diamond crystals
and a radiation detector and data acquisition system that allows to
record the spectral distribution of the CR in order to investigate the
electron-crystal interaction in more detail. The system must be able to
handle more than 10 6 counts per second. First measurements have been
performed in order to test the system.
∗ supported by BMBF under contract 06DA915I and the DFG
Graduiertenkolleg 410
[1] M.J. Hoogan et al., Phys. Rev. Lett. 90, 205002 (2003).
[2] P. Chen and R. Noble, p. 273 in Advanced Accelerator Concepts, eds.
S. Chattopadhyay et al., AIP Press C398, New York (1997).
[3] W. Lotz et al., Nucl. Instr. Meth. Phys. Res. B48, 256 (1990).
[4] C.K. Gary et al., Nucl. Instr. Meth. Phys. Res. B51, 458 (1990).
HK 12.3 Tue 13:30 Foyer
A Low Energy Photon Tagger at the S-DALINAC ∗ — •K. Lindenberg
and A. Zilges — Institut für Kernphysik, Technische Universität
Darmstadt, Germany
S-DALINAC to investigate particle threshold of the The fine structure
of dipole strength above the particle threshold has an important impact
on reaction rates relevant for nucleosynthesis and on the general understanding
of the structure of atomic nuclei close to the continuum. The
tagging spectrometer for the superconducting Darmstadt electron accelerator
S-DALINAC will be able to deliver tagged photons in the energy
range E = 10 −50 MeV. The planned photon energy resolution is about
0.25 %. Photon intensities of 10 7 photons/s can be expected. We will
show first calculations and results from simulations.
∗ supported by the DFG (SFB 634)
HK 12.4 Tue 13:30 Foyer
New developments on a parallel-plate avalanche counter
(PPAC) for low-energy radioactive ions — •M. Pantea 1 , W.
Carli 2 , R. Lutter 2 , O. Kester 2 , G. Schrieder 1 , H. Simon 3 , and
P. Thirolf 2 — 1 Institut für Kernphysik, TU Darmstadt, D-64289
Darmstadt, Germany — 2 Maier-Leibnitz-Laboratorium, LMU München,
D-85748 Garching, Germany — 3 Gesellschaft für Schwerionenforschung,
D-64291 Darmstadt, Germany
At REX-ISOLDE [1], an especially thin (< 1 mg/cm 2 ) position sensitive
parallel-plate avalanche counter (PPAC) is used to optimise the
beam on the MINIBALL [2] experimental targets. This PPAC can be
put close to the target without stopping the radioactive beam, and so
producing any radioactive background in the close MINIBALL gamma
array. Recently, developments concerning the gas supply and the readout
electronics have been achieved. A gas control system has been designed
that allows for a safe handling of the delicate PPAC while accessing the
experimental area. The gas flow and pressure (about 5 mbar) in the
PPAC are regulated automatically. The detector can be used in signleparticle
and current readout mode. The sensitivity of the current readout
electronics has been improved, and presently from up to 10 8 to down to
about 10 3 particles per second can be detected. This allows for the PPAC
to be used for low-intensity radioactive beam tuning. Latest test results
concerning the resolution and sensitivity of the PPAC will be presented.
Supported by BMBF 06 DA 115.
[1] D. Habs et al., Nucl. Phys. A 616, 29c (1997)
[2] J. Eberth et al., Prog. Part. Nucl. Phys. 46, 389 (2001)
HK 12.5 Tue 13:30 Foyer
TRIµP - A new facility to produce and trapradioactive isotopes
— •M. Sohani, G.P.A. Berg, U. Dammalapati, P. Dendooven,
O. Dermois, G. Ebberink, M. Harakeh, R. Hoekstra, L. Huisman,
K. Jungmann, H.H. Kiewiet, R. Morgenstern, J. Mulder,
A. Rogachevskiy, M. Sanchez-Vega, R. Timmermans, E.
Traykov, L. Willmann, and H.W. Wilschut — Kernfysisch Versneller
Instituut, Rijksuniversiteit Groningen, Netherlands
At the Kernfysisch Versneller Instituut (KVI) in Groningen the new
facility TRIµP (Trapped Radioactive Isotopes - µicrolaboratories for fundamental
Physics) is being set up. It aims for producing radioactive isotopes
for studying fundamental interactions in physics. Heavy ion beams
from the superconducting cyclotron AGOR will be used to create isotopes
in inverse kinematics and fragmentation reactions. The products will be
separated from the primary beam in a magnetic device. A double recoil
and fragment separator system allows to cover a broad range of isotopes.
They will be slowed down in matter. and further cooled, confined and
bunched using a segmented radiofrequency quadrupole system. Singly
charged species are guided to experimental stations. After neutralization
the atoms will be optically cooled to below mK temperatures and stored
in an atom trap (magneto optical trap). The research program pursued
by the local KVI group includes precision studies of nuclear β-decays,
through β–neutrino(recoil nucleus) correlations and searches for permanent
electric dipole moments. Commissioning of the facility is foreseen in
the course of the year 2004, where after it will be open for use by outside
scientific groups.
HK 12.6 Tue 13:30 Foyer
FRS-Resolution and kinematical cuts. — •Orlin Yordanov 1 ,
Jose Benlliure 2 , Timo Enqvist 3 , Jorge Pereira 2 , and Karl-
Heinz Schmidt 1 — 1 Gesellschaft für Schwerionenforschung mbH,
Planckstr. 1, D-64291 Darmstadt, Germany — 2 Dpto. de Fisica de
Particulas, Universidad de Santiago de Compostela, E-15706 Santiago
de Compostela, Spain — 3 CUPP-Project, P.O.-Box 22, FIN-86801
Pyhäsalmi, Finland
The GSI Projectile Fragment Separator (FRS) as a high-resolution
magnetic spectrometer is well suited for studies of fragmentation reactions
using the inverse kinematics technique. The capability of the identification
in atomic number, combined with the measurement of the timeof-flight
and magnetic rigidity of the reaction products, enables studies
on reaction kinematics and the precise measurements of production cross
sections even of very short-living nuclei. It is shown that rather unique
values for the mass resolution (A/∆A≈500) and for the absolute precision
of the velocity of the fragments in the projectile frame (0.01 cm/ns)
have been reached at 1 A GeV. The acceptances of the spectrometer in
angle and momentum are sufficient to fully cover the distributions of the
heavier fragments. Full momentum distributions of lighter fragments can
be established by combining the information measured with different settings
of the magnetic fields, if appropriate corrections for the momentum
dependence of the angular transmission are applied. These data on reaction
kinematics give a new experimental access to the physics of nuclear
matter under extreme conditions.
HK 12.7 Tue 13:30 Foyer
Ion-optical layout of the beam line for a new dedicated experimental
area for reaction experiments with exotic nuclei at
the FRS — •N. Yao 1 , T. Aumann 1,2 , H. Emling 2 , H. Geissel 1,2 ,
G. Münzenberg 2 , H. Simon 2 , H. Weick 2 , and M. Winkler 1,2 —
1 JLU Giessen — 2 GSI Darmstadt
The projectile fragment separator FRS [1] at GSI has been successfully
used for the production and isotopic separation of exotic nuclear beams
for all elements up to uranium. Presently a dedicated experimental area
will be installed to perform nuclear structure studies using direct reactions.
Secondary products such as fragments, light charged particles, and
neutrons are measured in complete kinematics. Here, we present the ion
optical layout for the transport and separation of exotic nuclei into the
new experimental area.
[1] H. Geissel et al, Nucl. Instr. and Meth., B70(1992)286
HK 12.8 Tue 13:30 Foyer
Fiber Array Detectors for HADES — •B. Spruck, R. Novotny,
and V. Metag for the HADES collaboration — II. Phys. Inst. Uni.
Gießen, Heinrich-Buff-Ring 16, 35392 Gießen
The HADES detector at GSI is now ready to take data with a hydrogen
target. For proton and pion induced reactions a high beam intensity is
needed to get sufficient event rates. In order to reduce the trigger rates a
start/veto detector system for high rates was developed and tested during
a beam time in september 2003.
A good time resolutions (σ < 500ps) and high granularity can be
achieved by using an array of scintillating fibers with fast relaxation
times and a diameter of 1mm. The light output is increased by using
four layers of fibers. The fibers are read out with multi anode ”booster
based” PMTs which are modified for linear output at high count rates.
The results from the proton beam run with these start/veto prototypes
will be presented.
∗ supported by GSI and BMBF.

Nuclear Physics Tuesday
HK 12.9 Tue 13:30 Foyer
The HADES Run Control ∗ — •B. Sailer 1 , B. Kolb 2 , M.
Münch 1 , and M. Traxler 2 for the HADES collaboration —
1 Technische Universität München, James-Franck-Strasse 1, D-85748
Garching — 2 Gesellschaft für Schwerionenforsching mbH Darmstadt,
Planckstrasse 1, D-64291 Darmstadt
The High Acceptance DiElectron Spectrometer HADES at GSI Darmstadt
has started data taking. The data aquisition combined with a multilevel
trigger system is capable to read out 80000 channels at a first level
trigger rate of 3 × 10 4 Hz with zero supression and to transport 6 × 10 3
events to mass storage every second. The complex system consists of
more than 1000 frontend and over 100 VME boards with a large number
of different tasks and layouts, mainly custom built hardware. A run control
system utilizing the EPICS package has been developed making use
of its network communication layer, monitoring and sequencing capabilities.
Interfaces have been introduced to allow distributed and modular
development of hardware drivers and easy exchange of parameter sources.
This includes read and write access to the HADES database and allows
complete bookkeeping of the experimental settings for analysis purposes.
The scheme and first performance results are presented.
∗ supported by BMBF (06MT190) and GSI (TM-FR1, TM-KR1).
HK 12.10 Tue 13:30 Foyer
Comissioning results of the REX-ISOLDE linac — •Stephan
Emhofer 1 , Dietrich Habs 1 , Oliver Kester 1 , Matteo Pasini 1 ,
and Thomas Sieber 2 — 1 Sektion Physik der Ludwig-Maximilians-
Universität München; Am Coulombwall 1, D-85748 Garching — 2 CERN,
CH-1211 Geneva 23
At REX-ISOLDE at the ISOLDE-facility of CERN radioactive ions are
post accelerated with a 10 meter linac for experiments in nuclear-, astroand
solid state physics. For the efficient acceleration to energies between
0.8 and 3.1 MeV/u the principles of charge breeding of radioactive ions
by an electron beam source was introduced at REX. The linac in its current
stage consists of a 4-rod RFQ, a re-buncher, a 20-gap IH-drift-tubecavity,
three seven-gap-splitring resonators and one nine-gap-IH cavity.
The linac and its beam transport system is able to accelerate ions up
to a mass to charge ratio of 4.5 in its current stage. Commissioning
measurements of the linac were made and will be presented and compared
to the results of simulations, showing the current energy spreads
and radial emittances of the different cavities. This work is supported
by BMBF under contract 06ML185, 06ML186I and by the EU under
HPRI-CT-1999-00018.
HK 12.11 Tue 13:30 Foyer
Characterization of the SHIPTRAP gas cell with a time of flight
mass spectrometer — •Sergey Eliseev 1 , W Plaß 1 , Z Wang 1,2 ,
H Geissel 1,2 , C Scheidenberger 1,2 , D Habs 3 , P Thirolf 3 , J Neumayr
3 , and S Heinz 3 — 1 II.Physikalisches Institut Giessen — 2 GSI
Darmstadt — 3 Sektion Physik der LMU München Garching
An on-line characterization of the SHIPTRAP gas cell was carried out
with a time-of-flight mass spectrometer.As a primary beam 107 Ag 17+ and
109 Ag 17+ from the tandem accelerator in Garching with kinetic energies
ranging from 20 MeV to 30 MeV were used.The beam was stopped in the
gas cell, extracted and injected into the mass spectrometer.The efficiency
of the gas cell was studied as a function of the beam kinetic energy and
the beam intensity.The maximum efficiency was measured to be some
4% at low beam intensity and to decrease for beam intensities higher
than 2 ∗ 10 8 ions per second.Chemical reactions and adducts formation
occurring in the gas cell during the experiment were a subject of close
investigation, such as those due to water and hydrocarbons.
HK 12.12 Tue 13:30 Foyer
SAPIS - Stored Atoms Polarized Ion Source — •G. Tenckhoff,
R. Emmerich, R. Schulze, C. Weske, and H. Paetz gen. Schieck
— Institut für Kernphysik der Universität zu Köln, Zülpicher Strasse 77,
50937 Köln
In 1995, improved varieties of the colliding-beams type polarized ion
sources, some of which are used successfully in different laboratories such
as COSY, have been proposed independently by three participants of the
Cologne Polarized Beams and Targets Workshop [1]. An intensity gain
factor has been predicted of at least ten without considerable loss of polarization.
The main design feature is the use of a T-shaped storage cell
for the charge-exchange region. A source of this type has been built. Its
setup and first operational results will be presented.
Supported by BMBF
[1] International Workshop on Polarized Beams and Polarized Gas Targets
(1995), World Scientific, pp. 155, 208, and 231
HK 12.13 Tue 13:30 Foyer
A set up for High-Resolution Studies of Odd-N Fission Isomers ∗
— •T. Morgan 1 , C. Alvarez 1 , B. Bruyneel 2 , A. Bürger 3 , D.
Habs 1 , R. Hertenberger 1 , N. Holzapfel 1 , H. Hübel 3 , H.-J.
Maier 1 , E. Mergel 3 , P. Reiter 2 , C. Schürmann 1 , W. Schwerdtfeger
1 , and P. Thirolf 1 for the MINIBALL collaboration — 1 Ludwig
Maximilians Universität Müechen — 2 Universität zu Köln — 3 Rheinische
Friedrich-Wilhelms Universität Bonn
In order to prepare for conversion electron and γ -ray spectroscopy
studies of the odd-N fission isomers in 237 Pu, following the 235 U(α,2n) reaction
[1], the small population cross section (ca. 1µb), requires a large
solid angle coverage both for the γ rays as well as for the (delayed) fission
fragments. An economical solution for the fission fragment detection is
provided by the use of commercially available silicon solar cells. Two
detector arrays were developed for conversion electron studies with Mini
Oranges and γ -spectroscopic studies with the highly efficient MINIBALL
spectrometer, respectively. Test experiments have been performed (i) to
characterise the timeing properties of the solar cells intended to act as
trigger detectors between prompt and delayed fission and (ii) to commission
the set up at the MINIBALL spectrometer at the IKP in Cologne,
allowing to use thick, metallic highly-oxidising 235 U targets. *Supported
by MLL and the DFG under contract number HA 1101/6-3
[1] P. Thirolf and D. Habs, Progr. Part. Nucl. Phys. 49 325 (2002)
HK 12.14 Tue 13:30 Foyer
MAFF - Beam extraction and transport — •Florian
Nebel 1,2 , Thomas Faestermann 1,2 , and Reiner Krücken 1,2 for
the MAFF collaboration — 1 Physik-Department E12, Technische
Universität München, James-Franck-Strasse, D-85748 Garching —
2 Maier-Leibnitz-Laboratorium, Am Coulombwall 6, 85748 Garching
The Munich Accelerator for Fission Fragments, currently being developed
at the new research reactor FRM-II, is using neutron induced fission
to produce neutron rich exotic nuclides.
The Poster will give a very brief overview of MAFF and focus on the
beam extraction and transport. The electrostatic beam guidance system
extracts the fission products from the ion source and transports the
beam to a Mattauch-Herzog type mass separator. Two masses m1 and
m2 (m1/m2 ≈3/2) are selected by the separator and injected to separate
coolers, for emittance improvement.
In the first stage of MAFF one of the beams will be used for low energy
experiments, with MAFFTRAP or MINIBALL.
HK 12.15 Tue 13:30 Foyer
The simulation of UCN experiments with Geant4 — •Peter
Fierlinger, Reinhold Henneck, Axel Pichlmaier, and Klaus
Kirch — PSI
The particle tracking code Geant4 was adapted to handle the influence
of gravity, time dependent inhomogeneous magnetic fields and material
interactions for the simulation of ultracold neutron experiments. In contrast
to other codes Geant4 can handle almost any geometry by a standardized
CAD interface and has a wide range of nuclear physics already
implemented. Tests and performance of the tracking procedure with new
implemented forces and physics processes are shown. A full simulation
for a new experiment to measure the loss- and spinflip-probability per
wall collision in a combined material-, gravitational- and magnetic trap
is discussed.
HK 12.16 Tue 13:30 Foyer
Mini-D2, a source for ultracold neutrons at the neutron source
FRM-II — •Daniele Tortorella, Igor Altarev, Andreas Frei,
Andreas Gschrey, Erwin Gutsmiedl, F. Joachim Hartmann,
Stephan Paul, Wolfgang Schott, and Oliver Zimmer — Physik-
Department E18, Technische Universität München
Mini-D2 is a new facility for the production of ultracold neutrons
(UCN) that will be installed at the SR4 channel of the new neutron
source FRM-II at Garching. About 200cm 3 of solid deuterium at about
5 K will be used as converter. It will be placed inside a specially shaped
cup at the end of a long horizontal storage tube (diameter about 6cm,
length about 8m), very close to the cold source of the reactor. The
tube will be coated from inside with a thin layer of Be, thus improving
the storage capacity of the system. According to model calculations we
may expect a UCN density of about 10 4 UCN/cm 3 , orders of magnitude

Nuclear Physics Tuesday
larger than that of the best existing source at the high-flux reactor of
Institut Laue Langevin, Grenoble. Test measurements at the TRIGA-
Mainz reactor, in collaboration with the University of Mainz, are planned
for January 2004.
Supported by the Maier-Leibnitz Laboratory (MLL) of LMU and TUM
at Garching and by the Deutsche Forschungsgemeinschaft.
HK 12.17 Tue 13:30 Foyer
IH-RFQ for the MAFF project at FRM-II — •Matteo Pasini 1 ,
Oliver Kester 1 , Michael Schumann 1 , Dieter Habs 1 , Thomas
Sieber 1 , and Alwin Schempp 2 — 1 Sektion Physik, LMU, München,
Germany — 2 Institute für Angewandte Physik, Universität Frankfurt,
Frankfurt, Germany
For the LINAC of the Munich accelerator for fission fragments (MAFF)
an IH-RFQ resonator is under construction. This resonator will operate
at a resonance frequency of 101.28 MHz, which is the upper frequency
limit for those structures and with a maximum duty cycle of 10%. The
MAFF IH-RFQ will accelerate ions with A/q < 6.5 from 3 keV/u injection
energy to about 300 keV/u. Intensive simulations with MWS and
PARMTEQ have been performed to reach a final design for the resonator.
A short model has been built and low level r.f. measurements are in
progress to test the calculations. The mechanical design has been confirmed
and the full power cavity will soon be ordered. The injection
scheme for MAFF has been modified to allow the installation of a low
frequency multi-harmonics buncher allowing thus more time separation
between main bunches. A new layout of the accelerator facility will be
presented.
HK 12.18 Tue 13:30 Foyer
Magnetic field stabilization by a Helmholtz-like coil configuration
— •Henneck R., S. Czekaj, M. Daum, P. Fierlinger, Z.
Hochman, M. Kasprzak, K. Kohlik, K. Kirch, M. Kuzniak, G.
Kuehne, D. George, A. Pichlmaier, A. Siodmok, A. Szelc, and
L. Tanner — PSI
For highly sensitive measurements of the neutron electric dipole moment
(EDM) the magnetic field has to be stable on a level below picoTesla.
One of several measures we employ to achieve this (apart from
passive mu-metal shielding with shaking, resonance frequency stabilization,
internal field stabilization, multi-chamber system) is to use an external
field coil system which can stabilize the ambient external field at
a predefined value. Here we report on the construction and characterization
of such a system in the magnetic test facility at PSI. The system
actively stabilizes the field along the axis of the EDM experiment by
means of 4 coils in a Helmholtz-like configuration. Additional coils serve
to compensate for transverse ambient field components. Due to the 4coil
geometry large magnetic suppression factors are expected. Because
of the long integration times in the EDM experiment (about 100 s or
more) only slow disturbances have to be corrected for. The performance
of the system has been measured using static as well as moving magnetic
sources and suppression factors in excess of 200 have been observed.
HK 12.19 Tue 13:30 Foyer
Proton detection in aSPECT — •Gerd Petzoldt 1 , Stefan
Baeßler 2 , Jim Byrne 3 , Ferenc Glück 2 , Joachim Hartmann 1 ,
Werner Heil 2 , Raquel Muñoz Horta 2 , Igor Konorov 1 , Marius
Orlowski 2 , Yuri Sobolev 2 , Maurits van der Grinten 3 , and
Oliver Zimmer 1 — 1 Physik Department E18, Technische Universität
München — 2 Institut für Physik, Universität Mainz — 3 University of
Sussex, Falmer, Brighton, UK
Present neutron decay data indicates that unitarity tests of the
Cabbibo-Kobayashi-Maskara matrix fail by about 3σ. With the retardation
spectrometer aSPECT, we will measure the electron-antineutrino
correlation coefficient in neutron decay a by determinig the shape of the
proton recoil spectrum, which is sensitive to a. We hope to increase
the precision of the measurement by at least one order of magnitude,
compared to older experiments. Determinig the upper left element Vud
from a will allow an independent test of CKM unitarity.
The measurement requires a very sensitive detection system. We will
use segmented Si-PIN diodes, which allows us to supress correlated electron
background by applying an E×B drift in front of the detector. The
structure also reduces capacitive noise of the detector. For the readout
of the detector, a fast, low-noise electronics has been developped.
The detection system and calculations on the systematic effects on a
to be expected from the detector properties, will be presented in this
poster.
This work is supported by the MLL Garching and the BMBF.
HK 12.20 Tue 13:30 Foyer
Design of the new Crystal-Barrel forward cone — •Philipp
Hoffmeister and Christoph Wendel for the CBELSA collaboration
— Helmholtz-Institut für Strahlen- und Kernphysik der RFWU Bonn,
53115 Bonn
The main purpose of the Crystal-Barrel detector at ELSA is to investigate
the structure of hadrons. A barrel-shaped setup of CsI-Crystals is
used, allowing the investigation of multi-photon final states. Since the
Crystal-Barrel is a ”fixed target” experiment, the forward direction demands
special attention. Until the end of 2003, the TAPS detector was
used to cover the inner 30 ◦ of the forward direction. The loss of the TAPS
detector made it necessary to construct a new forward calorimeter with
fast trigger capabilities for photons and charged particles. Therefore the
pre-TAPS Crystal-Barrel setup is modified by replacing the photodiode
readout with fast photomultipliers and a redesigned electronic backend,
providing a trigger fast enough to cope with the high photon flux used
in the experiment. Additionally two thin layers of szintillating material
with fibre readout are placed in front of the crystals, providing a fast
trigger for charged particles.
This poster will describe in detail these modifications and the design of
the new Forward Plug.
HK 12.21 Tue 13:30 Foyer
The Frankfurt Funneling Experiment — •Jan Thibus, Ulrich
Bartz, Norbert Müller, Alwin Schempp, and Holger Zimmermann
— Institut für Angewandte Physik, Johann Wolfgang Goethe-
Universität, Robert-Mayer-Str. 2-4, D-60054 Frankfurt am Main, Germany
Funneling is a procedure to multiply beam currents at low energies
which is required for the proposed new high current accelerator facilities
like HIDIF or ESS. Funneling can be done using several stages in which
multiple beams are merged to a common beam axis. Thus very high
energies and beam currents can be achieved. The main goal is to keep
the emittance nearly unchanged. The Frankfurt Funneling Experiment
consists of two ion sources, a Two-Beam RFQ accelerator, two different
funneling deflectors and a beam diagnostic equipment system. The
whole set-up is scaled in He + instead of Bi + of the first funneling stage
of a HIIF driver. The progress of our experiment and the results of the
simulations will be presented.
HK 12.22 Tue 13:30 Foyer
CONCEPTUAL DESIGN OF A 350 MHZ- PROTON- RFQ
FOR GSI — •Benjamin Hofmann, Lutz Brendel, Kai-Uwe
Kuehnel, and Alwin Schempp — IAP Frankfurt
Part of the future project of GSI is a p- linac for the production of
anti-protons. The first component of this linac is a 4- Rod-RFQ operating
at 350 MHz. Design studies have been made using the Parmteq- and
Microwave Studio code to optimize the field distribution and symmetry.
A short copper model has been built for field measurements. Results of
the design studies will will be presented.
HK 12.23 Tue 13:30 Foyer
Measurements on a focusing drift tube cavity — •Kai-Uwe
Kuehnel 1 , Carsten Peter Welsch 2 , and Alwin Schempp 1 —
1 IAP Frankfurt — 2 MPI-K Heidelberg
The efficiency of RFQs decreases at higher particle energies. The DTL
structures used in this energy regions have a defocusing influence on
the beam. To achieve a focusing effect, fingers with quadrupole symmetry
were added to the drift tubes. Driven by the same power supply
as the drift tubes, the fingers do not need an additional power source or
feedthrough. The beam dynamics have been calculated with PARMTEQ
and the rf properties have been examined using Microwave Studio. A
compact spiral loaded cavity with four accelerating gaps has been built
for light ions with an energy of 2 MeV/u. The overall length of the cavity
is 0.36 m with a cell length of 61 mm. The design frequency is 160 MHz.
The results of the low level measurements as well as bead pertubation
measurements are shown.
HK 12.24 Tue 13:30 Foyer
LORD of the Rings — •Carsten Welsch 1 , Joachim Ullrich 1 ,
Kai-Uwe Kühnel 2 , Christian Gläßner 2 , Alwin Schempp 2 , and
Horst Schmidt-Böcking 3 — 1 Max-Planck-Institut fuer Kernphysik,
Heidelberg — 2 Institut fuer Angewandte Physik, Frankfurt — 3 Institut
fuer Kernphysik, Frankfurt

Nuclear Physics Tuesday
Electrostatic Storage Rings can be seen as a cross between electrostatic
traps and ”conventional” magnetic rings. They combine compact
size, easy access with excellent beam parameters like small emittance and
small momentum spread. At the moment, they are used for an energy
range between some 10 keV and a few 100 keV.
These machines are real multi-user facilities: The circulating beam
can be used at different places for direct in-ring experiments or can be
extracted and be injected into a trap or be guided to an external target.
This contribution presents a selection of possible experiments that can
be carried out in electrostatic storage rings. It demonstrates that this
kind of machine can be a valuable tool for a variety of different fields.
HK 12.25 Tue 13:30 Foyer
Simulations of Fringe Fields and their Effects in Electrostatic
Storage Rings — •Christian Glaessner, Carsten Welsch, Kai
Uwe Kühnel, and Alwin Schempp — IAP Frankfurt, Robert-Mayer-
Str. 2-4, D-60325 Frankfurt am Main
A quarter ring section of an electrostatic storage ring which is able
to store particles up to a total energy of 50 keV is being built up at
IAP Frankfurt. The used beam transport elements are dipoles (10circand
70circ-deflectors) and quadrupoles. Fringe fields exist in all of these
elements. These fringe fields have effects on phase space couplings, the
actual useable fields, the angles of deflection and also on the dynamic
aperture of the machine.
The poster shows simulations of these fringe fields and their effects as
well as possible solutions to reduce all these effects.
HK 12.26 Tue 13:30 Foyer
Effects of Fringe Fields in an Electrostatic Storage Ring —
•Christian Glaessner, Carsten Welsch, Kai Uwe Kühnel, and
Alwin Schempp — IAP Frankfurt, Robert-Mayer-Str. 2-4, D-60325
Frankfurt am Main
At IAP Frankfurt a quarter ring section of an electrostatic storage ring
is being built up. This ring is able to store particles up to a total energy
of 50 keV. Optical elements that are used for beam transport in the ring
are dipoles (10circ and 70circ- deflectors) and quadrupoles. Each of these
elements was analyzed with respect to its fringe fields, the actual useable
electric field of the elements, the change in the angle of deflection and the
effects of the fringe fields on the dynamic aperture./par This contribution
discusses results of the above studies and presents possible solutions to
reduce all these effects.
HK 12.27 Tue 13:30 Foyer
The spectrometer aSPECT - A Superconducting Spectrometer
to analyze the Fundamental Laws of Weak Interaction in Neutron
Beta Decay — •Stefan Baeßler 1 , Jim Byrne 2 , Ferenc
Glück 1 , Joachim Hartmann 3 , Werner Heil 1 , Igor Konorov 3 ,
Raquel Muñoz Horta 1 , Marius Orlowski 1 , Gerd Petzoldt 1 ,
Yuri Sobolev 1 , Maurits van der Grinten 2 , and Oliver Zimmer
3 — 1 Institut für Physik, U. Mainz — 2 University of Sussex, Falmer,
Brighton, UK — 3 Physik Department E18, TU München
Since recently the upper left element of the Cabbibo-Kobayashi-
Maskawa-Matrix Vud can be determined from neutron decay data alone
with an accuracy which is comparable to the traditional derivation from
nuclear decay data. Both methods agree with each other. However, both
values for Vud, together with Vus and Vub from high energy physics, violate
the unitarity of the Cabbibo-Kobayashi-Maskawa-Matrix by about
2 to 3 sigma. The neutron decay data used for this test is the neutron
lifetime τn and the beta asymmetry A. Recent determinations of A are
not consistent with each other. In the Standard Model, measurements of
the neutrino electron correlation coefficient a are equivalent to measurements
of A, so that a new measurement of a can either solve the unitarity
problem, or it can confirm it with entirely different systematics. In this
poster the spectrometer aSPECT is presented. Its purpose is to measure
a with a relative accuracy of a few parts per thousand which corresponds
to an improvement in A by half an order of magnitude.
HK 12.28 Tue 13:30 Foyer
The laser ion source trap LIST for on-line ion production
- status and perspectives — •Katja Wies 1 , Kim Brück 1 ,
Christopher Geppert 1 , Thomas Kessler 1 , Gerd Passler 1 ,
Simone Sirotzki 1 , Klaus Wendt 1 , H.-J. Kluge 2 , Manas
Mukherjee 2 , Klaus Blaum 3 , and Stefan Schwarz 4 — 1 Institut
für Physik, Universität Mainz, 55099 Mainz — 2 GSI, 64291 Darmstadt
— 3 CERN, CH-1211 Geneva 23, Switzerland — 4 MSU, East Lansing,
USA
At the institute for physics of the university of Mainz an ion source for
on-line applications is developed, which combines resonant laser ionization
of atoms with a radiofrequency quadrupole ion trap (RFQ). In the
setup the atomization and ionization regions are separated by using an
ion repelling electrode to prevent unwanted surface ions and to significantly
increase the isobaric selectivity. The laser ions are stored in the
trap, cooled with buffer gas and are released in a well controlled bunch of
low spatial and temporal emittance. Simulation studies are performed on
the ionization and trapping conditions, showing high efficiency for the individual
processes of trapping, cooling and extraction of the ions. Initial
installation and testing of the device is carried out at the Mainz RISIKO
mass separator. Source and trap design, the simulation studies and first
measurements on laser ionization on stable isotopes will be discussed.
HK 12.29 Tue 13:30 Foyer
Results from the A4 Parity Violating Experiment at MAMI —
•Sebastian Baunack — Institut fuer Kernphysik, J.J. Becherweg 45,
55099 Mainz
The A4 collaboration at the Mainz Mikrotron MAMI is investigating
the contribution of strange quarks to the form factors of the nucleon. The
experimental method is the measurement of the parity violating asymmetry
in the cross section in the elastic scattering of polarized electrons
off unpolarized protons.
With a scattering angle of 35 ◦ and an electron energy of 854.3 MeV
and 570.1 MeV, measurements have been taken for Q 2 = 0.23GeV 2 and
Q 2 = 0.1GeV 2 respectively. Both results and their implication on the
strangeness contribution will be presented.
Futhermore, the A4 collaboration has made measurements with transversely
polarized electrons to investigate the transverse single spin asymmetry.
Results for Q 2 = 0.23GeV 2 will also be presented.
HK 12.30 Tue 13:30 Foyer
The luminosity monitor of the parity violating experiment at
MAMI — •Thorsten Hammel — Institut für Kernphysik, Johannes-
Gutenberg-Universität Mainz, 55099 Mainz
A detector system is described which measures the luminosity of the
parity violating experiment (PVA4) at MAMI to control the stability
of the liquid hydrogen target. This is required for a precise study of
the parity violating in the scattering of longitudinal polarized electrons
on unpolarized protons. A helicity correlated fluctuation of the target
density will lead to false asymmetries. The knowledge of these false
asymmetries is an important requirement of the experiment. A monitor
and a electronic system has been developed for the PVA4-Experiment.
The Properties of the luminosity monitors, investigated in ≈2000 hours
of electron beam, and its performance in the experiment are presented.
HK 12.31 Tue 13:30 Foyer
Rearrangement of the A4 Calorimeter for the measurment at
backward angles — •Boris Gläser for the A4 collaboration —
J.J.Becherweg 45 , 55099 Mainz
It is planned to measure backward kinematics in electron-scattering
on hydrogen and deuterium with the A4 calorimeter. For this purpose
the experimental setup will be positioned on a rotatable plaform, so that
measurements at forward and backward angles will be possible. This new
experimental setup and the special requirements will be discussed.
HK 12.32 Tue 13:30 Foyer
Progress report on the A4 Compton backscattering polarimeter
— •Yoshio Imai for the A4 collaboration — Institut für Kernphysik,
Universität Mainz, D-55128 Mainz, Germany
The A4-collaboration of the Dept. of Nuclear Physics, University
of Mainz, is conducting experiments on parity violation in the elastic
electron-nucleon-scattering which require the use of polarized electron
beams. For the measurement of the absolute beam polarization, a Compton
backscattering polarimeter using the new intra-cavity-technique has

Nuclear Physics Tuesday
been installed into the beamline. In August 2003, first backscattered
photons have been detected.
This talk will present the current status of operation and the challenges
encountered, and give an outlook at the expected performance of
the system.
HK 12.33 Tue 13:30 Foyer
Low energy proton detection — •Dong Chen, Johannes
Bröcker, Walter Carli, F. Joachim Hartmann, Stephan
Paul, Gerd Petzoldt, Rüdiger Picker, Wolfgang Schott,
and Oliver Zimmer — Physik-Department, Technische Universität
München
The neutron life time can be determined in an ultra cold neutron trap
experiment by measuring the protons from the neutron β decay( maximum
p energy 752 eV) with a large area p detector. Different methods,
where the p are measured by scintillators and photon detectors,either
directly or via p- induced δ electrons, are being investigated. A complete
signal- background separation was obtained by exposing 20 keV
p to a bulk Tl dotted CsI crystal connected to a photomultiplier tube.
More interesting are thin scintillator layers connected to photo diodes or
avalanche photo diodes, which are insensitive to γ rays and can be used
in a large magnetic field.
HK 12.34 Tue 13:30 Foyer
The COMPASS Online Filter — •Roland Kuhn, Thiemo Nagel,
Stephan Paul, and Lars Schmitt for the COMPASS collaboration
— TU München, Physik-Department E18, 85747 Garching
COMPASS is a high rate fixed target experiment, taking data at the
SPS at CERN. Due to the stringent time constraint at the first trigger
level an acceptable trigger rate can only be achieved at the cost of a
lower purity. The physics selectivity can be greatly enhanced by allowing
higher first level rates and enriching the interesting data after event
assembly, which saves storage space and reconstruction time. This also
leads to a reduction of trigger dead time, if hardware vetoes are partly
replaced by software filtering. The concept of the filter software along
with first performance results from the 2003 run of COMPASS will be
presented.
HK 12.35 Tue 13:30 Foyer
Beam-induced Depolarisation in the HERMES Transversely
Polarised Hydrogen Target * — •Phil Tait, Davide Reggiani,
and Erhard Steffens for the HERMES collaboration — Physikalisches
Institut, Universität Erlangen-Nürnberg
The Hermes polarised Hydrogen target is situated in the HERA electron
storage ring in Hamburg. For the transverse spin program at HER-
MES, the magnetic holding field of the target is perpendicular to the Hera
positron beam. An unwanted consequence is that the beam-induced resonance
between Hydrogen hyperfine states with ∆mF = 0, which was
previously forbidden, can occur. The shape and spacing of these resonances
will be shown. In order to prevent these resonances from reducing
the nuclear polarisation in the target cell, an additional coil has been
added to improve the field homogeneity. The success of these measures
will be demonstrated.
*) Supported by BMBF, project 06-ER-127
HK 12.36 Tue 13:30 Foyer
Interactive Parallel Analysis with PROOF — •Schwarz Kilian
— GSI, Planckstr. 1, 64291 Darmstadt, Germany
To be prepared for the parallel analysis of distributed datasets the different
options of setting up a PROOF cluster are investigated at GSI and
GridKa.
The Parallel ROOT Facility, PROOF, is an extension of the ROOT
system. It enables physicists to analyse large sets of ROOT files in parallel
on remote computer clusters.
PROOF consists of a 3-tier architecture, the ROOT client session, the
PROOF master server and the PROOF slave servers. PROOF daemons
are assigned on demand which start according to a predefined config-file
the masterserver to which the user connects. The master server in turn
creates, again via the PROOF daemons, slave servers on the nodes in the
cluster, which ask the master for work packets by using a pull protocoll.
The results can be merged at the end of the session. Such an environment
has been set up and tested. Hereby we compared the possibility
of setting up a dedicated PROOF cluster with the option to integrate
PROOF into the local batch system.
Parallel analysis of worldwide distributed data sets is possible by com-
bining PROOF with Grid technology. This has been tested by using the
ALICE Grid implementation AliEn, where the PROOF client connects
to a PROOF master server running on an AliEn core service machine.
The PROOF master connects to PROOF daemons in distributed sites
through an AliEn TCP routing service. This enables connectivity and
connection control to computing farms on private networks.
HK 12.37 Tue 13:30 Foyer
A VME module for Digital Pulse Processing — •Martin
Lauer 1 , Vinzenz Bildstein 1 , Hans Boie 1 , Frank Köck 1 , Ian
Lazarus 2 , Oliver Niedermaier 1 , Uttam Pal 1 , Heiko Scheit 1 ,
and Dirk Schwalm 1 — 1 MPI für Kernphysik, Heidelberg, Germany
— 2 Daresbury Laboratory, Warrington, UK
An algorithm to determine the energy of a γ ray from digitized preamplifier
signals was implemented on a four channel VME card with 14
bit, 80 MHz digitizers and XILINX Spartan 2 [1] Field Programmable
Gate Arrays (FPGA) for signal processing. In addition the firmware of
the GRT4 card (Gamma-Ray Tracking 4 channel) [2] was extended by a
module to trigger on the leading edge of the signal. The Moving Window
Deconvolution (MWD) algorithm [3] was used, which transforms the
preamplifier signal into a trapezoidal shape, the preferred shape for highrate
and high-resolution γ ray spectroscopy. The implementation also
includes the digital equivalent of a baseline restorer to remove any offset
from the spectra. The free XILINX WebPACK [1] software was used
to generate the programming information for the FPGA from a VHSIC
(Very High Speed Integrated Circuit) Hardware Description Language
(VHDL) design. The pulse processing capabilities of the GRT4 module
and the MWD implementation will be presented, as well as results
obtained with HPGe detector signals as input to the GRT4.
[1] www.xilinx.com
[2] http://nnsa.dl.ac.uk/GRT/grt4 brochure.pdf
[3] J. Stein et al. NIM B 113 (1996) 141-145
HK 12.38 Tue 13:30 Foyer
Effects of N2 in the ALICE TRD and TPC gases — •Chilo
Garabatos for the ALICE collaboration — Gesellschaft für Schwerionenforschung,
Darmstadt, Germany
It is inevitable that nitrogen impurities build up in detectors operated
in a closed-loop gas circulation mode. Therefore, we have studied the
effect of N2 contamination on the drift and amplification properties of
mixtures with noble gases and CO2.
For the Xe-CO2 [85-15] mixture foreseen for the ALICE Transition
Radiation Detector (TRD), the admixture of up to 20 % N2 marginally
affects the drift velocity at the operating drift field of 700 V/cm, whereas
the gain slightly decreases.
On the other hand, for the Ne-CO2 [90-10] drift gas of the ALICE
Time Projection Chamber (TPC), the addition of 5 % N2 results in a
decrease of the drift velocity of only 5 % at 400 V/cm, but substantially
extends the efficiency plateau of the Readout Chambers. Measurements
and simulations of drift velocities and gains in these mixtures will be
shown, and a picture describing the detector stability involving Penning
effects in the avalanche will be discussed.
HK 12.39 Tue 13:30 Foyer
Background in the ALICE TRD and in the TPC electronics
based on FLUKA calculations. — •Georgios Tsiledakis 1 , A.
Fassò 1,2 , P. Foka 1,2 , A. Morsch 2 , and A. Sandoval 1,2 for the AL-
ICE TRD collaboration — 1 GSI, Darmstadt — 2 CERN, Geneve
The main focus of the ALICE experiment at LHC is the study of
Pb–Pb collisions at nucleon-nucleon center-of-mass energy of 5.5 TeV.
Due to the high luminosity (10 27 cm −2 s −1 ) and the high particle multiplicities
anticipated in these collisions, a high background of thermal
neutrons is expected to build up as the particles shower and get stopped
in the material of the detectors, magnets, support structures, and in particular
in the concrete walls of the experimental cavern. The Transition
Radiation Detector (TRD) contains a gas mixture of 85% Xe, 15% CO2
with a total volume of 27.2 m 3 . Especially 131 Xe (abundance 21.18%) has
a very high neutron capture cross-section. This leads to multi-gamma deexcitation
cascades which can then produce low energy electrons through
photo-effect, Compton scattering, and pair production, thus resulting in
an uncorrelated background. We estimate the level of this random background
during the 3 µs gating time of the TRD chambers. In addition,
neutron fluences, doses, and the induced Xe radioactivity in the gas of the
TRD are calculated. We also estimate the radiation level in the region
where the electronics of the Time Projection Chamber (TPC) is located,

Nuclear Physics Tuesday
and we quantify the slow proton background that would originate from
a small admixture of CH4 to the 90% Ne, 10% CO2 TPC gas.
HK 12.40 Tue 13:30 Foyer
Results of Simulations on the TRD Physics Performance —
•Tariq Mahmoud for the ALICE TRD collaboration — Physikalisches
Institut, Universität Heidelberg, Germany
One of the main physics objectives of the ALICE Transition Radiation
Detector (TRD) is the measurement of quarkonia states via the
di-electron decay channel.
From prototype tests we obtain a pion rejection factor in the order of
100. With this electron identification capability, the TRD will allow to
sufficiently suppress the hadronic background present in high energy nucleus
collisions.
Performance parameters for fast simulations were determined as function
of angles, momenta and multiplicities of the ALICE central barrel for
Quarkonia in a realistic background environment. This was achieved using
space point resolutions from test beam measurements in conjuction
with microscopic simulations of the Inner Tracking System, the Time
Projection Chamber and the TRD.
We report on our results and show how the TRD improves the Quarkonia
signals.
HK 12.41 Tue 13:30 Foyer
Radiation tolerance of TRD readout electronics and its DCS
— •Marc R. Stockmeier — Physikalisches Institut der Unversität
Heidelberg, Philosophenweg 12, Heidelberg
The Transition Radiation Detector (TRD) is one of the main detector
components of the ALICE experiment. One purpose is to use the TRD
as a trigger on high momentum electrons. In order to guarantee a fast
data retrieving the read out electronics are placed directly in the TRD
chamber in the active area. The same is true for the Detector Control
System (DCS) boards.
During the operation of the experiment the electronic components are
irradiated mainly by secondary particles produced by nuclear reactions of
the primary reaction products along their flight path. This radiation can
damage the used electronics substantially. In order to check the degree of
the radiation tolerance of different standard electronic parts several tests
where performed at the Oslo Cyclotron Lab. Protons with an energy of
28.5MeV are used to test the lectronic components of the DCS board
and the readout board. Tests where performed with different proton currents
starting from 10pA, applying a total umber of protons above the
expected 7 ·10 9 particles per cm 2 and 10 years of ALICE operation. The
results of these test are going to be presented.
HK 12.42 Tue 13:30 Foyer
A neural network for electron/pion separation in the ALICE
TRD — •Alexander Wilk for the ALICE-TRD collaboration —
One of the main features of the ALICE Transition Radiation Detector
(TRD) is the identification of electrons with a momentum p > 1 GeV/c.
In this poster we present an alternative method for the separation of
electrons and pions in the ALICE TRD.
The “classical” methods of e/π separation employing a likelihood on
integrated energy deposit and a bidimensional likelihood on energy deposit
and position of the largest cluster achieve at an electron efficiency
HK 13 Poster Session: Theory
of 90% a pion rejection factor better than 100 for six TRD layers[1].
These methods use only a limited part of the information measured with
ALICE TRD. The amplitude measurement of each time bin can be further
exploited provided the correlations are properly taken into account.
Here we show the performance of a neural network with regard to e/π
separation which was trained using testbeam data. We use SNNS[2] to
test different setups, and compare it to the “classical” methods.
Supported by BMBF and GSI
[1] A.Andronic et al.(for the ALICE Collaboration), GSI Scientific Report
2002, Prototype tests for the ALICE TRD
[2] SNNS-Stuttgart Neural Network Simulator,http://wwwra.informatik.uni-tuebingen.de/SNNS/
HK 12.43 Tue 13:30 Foyer
Detector Control System for the ALICE Time Projection
Chamber — •Ulrich Frankenfeld 1 , G. Augustinski 1 , P.
Braun-Munzinger 1 , H.W. Daues 1 , C. Garabatos 1 , P. Glässel 2 ,
J. Hehner 1 , R. Renfordt 3 , H. Sann 1 , H.R. Schmidt 1 , H.
Stelzer 1 , D. Vranic 1 , and B. Windelband 2 — 1 Gesellschaft
für Schwerionenforschung , Darmstadt — 2 Universität Heidelberg —
3 Institut für Kernphysik, Universität Frankfurt
The Time Projection Chamber (TPC) is the main tracking detector
of the ALICE Experiment at the CERN Large Hadron Collider (LHC).
The Detector Control System (DCS) of the TPC controls the subsystems:
high voltage (108 channels), low voltage (72 channels), gas system, cooling
system (40 circuits), laser system, front-end electronic (216 read-out
boards) and the drift voltage of the field cage. Its functionality includes:
switching the subsystems on/off , monitoring and logging of relevant
detector parameters, stabilizing of the temperature in the sensitive volume
of the detector and reporting and logging of alarm conditions. The
TPC Control is part of the hierarchical Control System of Alice. During
normal operation the shift crew controls the detector at the highest
level (Experiment Control System). No specialized knowledge about the
sub-detectors is required. This implies that the DCS has to have the
appropriate functionality built in, for example setting the voltages in the
right order. A Finite State functionality has been implemented into the
DCS of the TPC. The architecture and test results of a prototype Control
System of the TPC will be presented.
HK 12.44 Tue 13:30 Foyer
On the Reliability of Microscopic Optical Model Calculations —
•Helmut Leeb, Marco Pigni, and Imante Raskinyte — Atominstitut
of Austrian Universities, TU Wien, Wiedner Hauptstrasse 8-10,
A-1040 Wien, Austria
The optical model is a basic ingredient for many calculations of nuclear
reaction cross sections. Several so-called microscopic optical potentials
are available which yield a fair reproduction of the gross structure of the
corresponding scattering observables. At present there is an increased demand
from nuclear technology for a reliable quantitative estimate of such
model calculations. In this contribution we present a procedure to estimate
quantitatively the uncertainties of such model calculations. The reliability
of the method is checked via a comparison of microscopic optical
model calculations with recent experimental nucleon-nucleus scattering
data. Work supported by Österreichische Akademie der Wissenschaften,
KKKÖ-Projekt 8/2002
Time: Tuesday 13:30–15:30 Room: Foyer
HK 13.1 Tue 13:30 Foyer
GPD’s with a soft pion emission: chiral perturbation theory
and soft pion theorem — •Nikolai Kivel — Universitat strasse
150, 44780 Bochum
Soft pion theorem was used recently in [1] to estimate contamination
due to the soft pion production in DVCS. But this approach was criticized
in [2] on the basis of Chiral Perturbation Theory. The authors of
[2] conclude that the soft pion theorem derived in [1] is incorrect because
it contrudicts to effective action of twist-2 operators in ChPT.
We recalculate the problematic matrix elements in the ChPT and find
mistake in the results of [2]. Correct results are consistent with soft pion
theorem for GPD’s discussed in [1].
[1]P.A.M.Guichon,L.Mosse and M.Vanderhaeghen, ”Pion production
in deeply virtual Compton Scattering”, hep-ph/0305231
[2]J. W. Chen and M. J. Savage,“Soft pion emission in DVCS,”
arXiv:nucl-th/0308033.
HK 13.2 Tue 13:30 Foyer
Angular momentum structure of the nucleon in the Chiral
Quark Soliton Model — •Jens Ossmann 1 , Klaus Goeke 1 , Maxim
Polyakov 2 , Peter Schweitzer 1 , and Diana Urbano 3 — 1 Institut
fü r Theoretische Physik, Ruhr-Universitä t, D-44780 Bochum, Germany
— 2 Institut de Physique, B5a, Universite de Liege au Sart Tilman, B4000
Liege 1, Belgium — 3 Faculdade de Engenharia da Universidade do Porto,
4000 Porto, Portugal
In the description of many hard exclusive processes, like deeply virtual
Compton scattering or hard exclusive meson production, enters the generalized
parton distribution E(x, ξ, t). This function is a priori unknown.

Nuclear Physics Tuesday
And unlike to H(x, ξ, t) where at least the forward limit H(x, 0, 0) =
q(x) is known from inclusive measurements, the shape of E(x, ξ, t) could
not be determined up to now. Especially the second moment of this
function is of great interest since it is connected via Ji’s sum rule to the
angular momentum of quarks.
We discuss X. Ji’s sum rule and the form factor J(t) of the energymomentum
tensor that gives us information about the spacial distribution
of the quark angular momentum inside the nucleon. Both objects
are investigated in the framework of the Chiral Quark Soliton Model.
This model has successfully been used to describe many nucleonic properties,
like parton distributions and form factors.
HK 13.3 Tue 13:30 Foyer
Chiral Dynamics and Nuclear Matter — •Stefan Fritsch 1 , Norbert
Kaiser 1 , and Wolfram Weise 2,1 — 1 Physik Department der
Technischen Universität München, Garching, Germany — 2 ECT*, Villazzano
(Trento), Italy
We calculate the equation of state of isospin-symmetric nuclear matter
in the three-loop approximation of chiral perturbation theory. The
contributions to the energy per particle Ē(kf) from one- and two-pion exchange
diagrams are ordered in powers of the Fermi-momentum kf (modulo
functions of kf/mπ). Already at order O(k 4 f) two-pion exchange produces
realistic nuclear binding. Without inclusion of any further short-
range terms the empirical saturation point, nuclear compressibility and
) with a momen-
asymmetry energy are well reproduced at order O(k5 f
tum cut-off of Λ ≃ 0.65GeV. We also evaluate the momentum and density
dependent single particle potential of nucleons in isospin-symmetric
nuclear matter. Furthermore, we extend our scheme to finite temperatures
and observe the liquid–gas phase transition of nuclear matter at
Tc ≃ 25.5 MeV and ρc ≃ 0.5ρ0. In addition to that, we investigate the
influence of additional explicit short range NN-interaction terms on the
momentum dependence of the single particle potential and on the critical
temperature of the phase transition. The effects of higher order diagrams
with virtual ∆ excitations are also considered.
Work supported in part by BMBF, GSI and DFG.
HK 13.4 Tue 13:30 Foyer
Nuclear energy density functional from chiral pion-nucleon dynamics:
Isovector spin-orbit terms — •Norbert Kaiser — Physik
Department T39, Technische Universität München, D-85747 Garching,
Germany
We extend a recent calculation of the nuclear energy density functional
in the systematic framework of chiral perturbation theory by computing
the isovector spin-orbit terms: (�∇ρp − �∇ρn) · (�Jp − �Jn) Gso(kf) + (�Jp −
�Jn) 2 GJ(kf). The calculation includes the one-pion exchange Fock diagram
and the iterated one-pion exchange Hartree and Fock diagrams.
From these few leading order contributions in the small momentum expansion
one obtains already a good equation of state of isospin-symmetric
nuclear matter. We find that the parameterfree results for the (densitydependent)
strength functions Gso(kf) and GJ(kf) agree fairly well with
that of phenomenological Skyrme forces for densities ρ > ρ0/10. At very
low densities a strong variation of the strength functions Gso(kf) and
GJ(kf) with density sets in. This has to do with chiral singularities m −1
π
and the presence of two competing small mass scales kf and mπ. The
novel density dependencies of Gso(kf) and GJ(kf) as predicted by our
parameterfree (leading order) calculation should be examined in nuclear
structure calculations.
N. Kaiser, S. Fritsch, W. Weise, Nucl. Phys. A724 (2003) 47.
N. Kaiser, Phys. Rev. C68, 014323 (2003).
Work supported in part by BMBF, GSI and DFG.
HK 13.5 Tue 13:30 Foyer
Spectral functions of isoscalar scalar and isovector electromagnetic
form factors of the nucleon at two-loop order — •Norbert
Kaiser — Physik Department T39, Technische Universität München,
D-85747 Garching, Germany
We calculate the imaginary parts of the isoscalar scalar and isovector
electromagnetic form factors of the nucleon up to two-loop order in chiral
perturbation theory. Particular attention is paid on the correct behavior
of ImσN(t) and ImG V E,M (t) at the two-pion threshold t0 = 4m 2 π in
connection with the non-relativistic 1/M-expansion. We recover the wellknown
strong enhancement near threshold originating from the nearby
anomalous singularity at tc = 4m 2 π − m 4 π/M 2 = 3.98m 2 π. In the case
of the scalar spectral function ImσN(t) one finds a significant improvement
in comparison to the lowest order one-loop result. Higher order
ππ-rescattering effects are however still necessary to close a remaining
20%-gap to the empirical scalar spectral function. The isovector electric
and magnetic spectral functions ImG V E,M(t) get additionally enhanced
near threshold by the two-pion-loop contributions. After supplementing
their two-loop results by a phenomenological ρ-meson exchange term
one can reproduce the empirical isovector electric and magnetic spectral
functions fairly well.
N. Kaiser, Phys. Rev. C68, 025202 (2003).
Work supported in part by BMBF, GSI and DFG.
HK 13.6 Tue 13:30 Foyer
The anomalous decays η/η ′ → π + π − γ — •Robin Nißler and
Bu¯gra Borasoy — Institute for Theoretical Physics (T39), TU
München, Germany
The axial anomaly of QCD dominates various low-energy processes involving
light mesons. Interesting examples for such anomalous processes
are the decays of η and η ′ into π + π − γ, since they reveal information
on both the chiral and the axial U(1) anomaly and, furthermore, yield
constraints for η-η ′ mixing.
The shape of the photon spectra in these decays cannot be understood
without considering resonances. We show the results of a calculation
within a chiral effective field theory including dynamically generated resonances
[1]. Financial support of the Deutsche Forschungsgemeinschaft
is gratefully acknowledged.
[1] B. Borasoy and R. Nißler, in preparation
HK 13.7 Tue 13:30 Foyer
η − η ′ mixing in Lage NC ChPT — •E. Lipartia and B. Borasoy
— Institute for Theoretical Physics (T39), TU München, Germany
We critically investigate the η −η ′ mixing up to one-loop order in large
NC Chiral Perturbation Theory . It is demostrated that it provides a consistency
check for large NC Chiral Perturbation Theory. Work supported
by Deutsche Forschungsgemeinschaft.
[1] B. Borasoy, E. Lipartia,
In preparation.
HK 13.8 Tue 13:30 Foyer
Isospin breaking and nucleon structure — •Tobias Gail and
Thomas R. Hemmert — Physik Department Technische Universität
München
We study the three vector and three axial vector weak form factors of
the nucleon including isospin breaking effects in the pion and nucleon sector,
using both the heavy baryon and the relativistic approach of SU(2)
chiral perturbation theory to O(p 3 ). Two of these form factors have not
been considered previously in these frameworks, since they parametrize
second class currents, currents of unnatural G-parity. We discuss the implications
of isospin breaking on low energy neutrino nucleon scattering
and ordinary muon capture. Consequences of isospin violation for the
unitarity of the CKM matrix are also discussed.
This work has been supported in part by BMBF, DFG and GSI.
HK 13.9 Tue 13:30 Foyer
Spectrum and decays of the kaonic hydrogen — •Udit Raha 1 ,
Ulf-G. Meissner 1,2 , and Akaki Rusetsky 1 — 1 HISKP (Th), Universität
Bonn, Bonn, Germany — 2 IKP (Th), FZ Jülich, Jülich, Germany
Recent accurate measurements of the strong energy shift and the lifetime
of the ground state of kaonic hydrogen by DEAR collaboration at
LNF-INFN[1] allow one to extract the precise values of the KN scattering
lengths from the data. To this end, one needs to relate the latter
quantities to the observables of the kaonic hydrogen at the accuracy that
matches the experimental precision. In our recent investigations[2], the
problem is considered within the non-relativistic effective Lagrangian approach,
which has been previously used to describe the bound π + π − and
π − p systems. We obtain a general expression of the strong shift of the
level energy and the decay width in terms of the KN scattering lengths,
at O(α, md − mu) as compared to the leading-order result. It is shown
that, due to the presence of the unitarity cusp in the K − p elastic scattering
amplitude above threshold, the isospin-breaking corrections turn
out to be very large. This, however, does not affect the accuracy of the
extraction of the scattering lengths from the experiment.
[1] Michael Cargnelli et al. (DEAR Collaboration), in proceedings of the
4th International Workshop on CHIRAL DYNAMICS 2003 (Theory and

Nuclear Physics Tuesday
Experiment), Bonn, Germany, ed. U.-G. Meissner, H.-W. Hammer, and
A. Wirzba, arXiv:hep-ph/0311212.
[2] U.-G. Meissner, U. Raha, and A. Rusetsky, in preparation
HK 13.10 Tue 13:30 Foyer
Threshold neutral pion electroproduction off the deuteron
— •Hermann Krebs1 , Véronique Bernard2 , and Ulf-G.
Meißner1,3 — 1HISKP (Th), Universität Bonn, Bonn, Germany —
2 3 Physique Théorique, ULP, Strasbourg, France — IKP (Th), FZ Jülich,
Jülich, Germany
We analyze neutral pion electroproduction off deuterium in chiral perturbation
theory. This allows to extract and test the single pion-neutron
electroproduction amplitude. The interaction kernel and the deuteron
wave functions are calculated consistently with each other in a novel formalism
based on the Q-box approach of Kuo and collaborators. The
interaction kernel decomposes into single nucleon (impulse approximation)
and three-body (meson exchange) pieces. Calculating the latter to
third order in the chiral expansion leads to a satisfactory description of
the data at photon virtuality Q2 = 0.1 GeV2 from MAMI-B [1]. Here,
we report upon improved results based on a complete fourth order calculation
of the three–body contribution, with all new parameters fixed
from the earlier studies of πN and NN phase shifts [2]. This work is
supported in part by the DFG.
[1] H. Krebs, V. Bernard, U.-G. Meißner, Nucl. Phys. A 713 (2003) 405.
[2] H. Krebs, V. Bernard and U.-G. Meißner, in preparation
HK 13.11 Tue 13:30 Foyer
Correlations in quark matter — •Frank Frömel, Stefan Leupold,
and Ulrich Mosel — Institut für Theoretische Physik, Universität
Giessen, 35392 Giessen, Germany
We investigate the spectral functions of quarks and mesons in quark
matter in a self consistent approach. Relations between self energies and
spectral functions are used in an iterative calculation beyond the usual
mean-field and RPA approximations. Starting from the pointlike interaction
of the SU(2) Nambu–Jona-Lasinio model we consider a full series
of RPA type diagrams with dressed quarks for the quark collision rate.
These diagrams are summed up and interpreted as dynamically generated
mesons (σ, π) coupling to the quarks. The results are fed back
into the quark self energies to obtain a self consistent scheme. Calculations
are performed at zero temperature and finite chemical potential;
in contrast to [1] the chirally broken phase is considered. We obtain self
consistent results for quark and meson masses and widths. In addition
the quark-meson coupling within our model is derived. Deviations from
mean-field calculations are discussed.
Work supported by DFG.
[1] F. Frömel, S. Leupold, U. Mosel, Phys. Rev. C67 (2003) 015206
HK 13.12 Tue 13:30 Foyer
Stability of q¯q strings in the Chromodielectric Model —
•Gunnar Martens, Carsten Greiner*, Stefan Leupold,
and Ulrich Mosel — Institut für Theoretische Physik, Universität
Giessen, 35392 Giessen, Germany (*present address: Institut für
Theoretische Physik, Universität Frankfurt, 60054 Frankfurt am Main,
Germany)
We describe color interactions in the Chromodielectric Model where
the color electric flux is confined through the interaction with a dielectric
medium [1]. The model parameters are fixed to reproduce lattice
calculations for both the potential and the geometric shape of q¯q flux
tubes. We investigate the stability of these q¯q strings i) in the presence
of an external color electric field and ii) with respect to q/¯q production
in the field of the string. In the former case we find that strings will
dissolve for background fields corresponding to an energy density of
200 MeV/fm 3 . In the latter case we present a tunnel potential for pair
creation.
[1] R. Friedberg, T.D. Lee, Phys. Rev. D 15 (1977) 1694.
HK 13.13 Tue 13:30 Foyer
The relativistic three-body problem and its stability on the light
front — •S. Mattiello 1 , M. Beyer 1 , T. Frederico 2 , and H.J.
Weber 3 — 1 FB Physik, U Rostock, Germany — 2 CTA, Sao Jose dos
Campos, Brazil — 3 U of Virginia, Charlottesville, USA
We present a relativistic three-body equation to study the stability
of the isolated three-body system with a zero-range force. Relativity is
implemented utilizing the light front form. In particular we study the dependence
of the system on an invariant cut-off. This can be understood
as the limiting scale for physics beyond “zero-range approximation” or
as an effective size parameter. The conditions of the relativistic Thomas
collapse are discussed. We investigate the possibility to describe the nucleon
as a Borromean system.
Acknowledgement: Work supported by Deutsche Forschungsgemeinschaft.
HK 13.14 Tue 13:30 Foyer
Combined analysis of single and double meson photoproduction
with the operator expansion method — •Andrey Sarantsev
for the Crystal Barrel at ELSA collaboration — Nussallee 14-16,
Bonn, 53115, Germany
The Lorentz invariant method for construction of partial wave amplitudes
for pion-N and photoproduction reactions is presented. In the case
of single meson production the method coincides with standard multipole
approach but provides a natural extension for the analysis of multibody
final states. The first results of combined analysis of photoproduction
data taken by the Crystal Barrel collaboration at ELSA are discussed.
HK 13.15 Tue 13:30 Foyer
Microscopic Investigation of Gauge-Restoration Procedures for
Strangeness Photoproduction — •Olaf Scholten 1 and Alexander
Korchin 2 — 1 KVI, 9747 AA Groningen, The Netherlands — 2 NSC
KIPT, 61108 Kharkov, Ukraine
We have calculated[1] loop corrections to the strong K + pΛ vertex as
well as the additional 4-point amplitude in an effective Lagrangian model
for photo-induced K + Λ production off the proton. The main focus in our
gauge-invariant approach has been on the scalar amplitude A2(s, t). The
results were compared with two commonly used phenomenological procedures,
namely Ohta’s minimal-substitution method[2] and Davidson -
Workman’s recipe[3].
The calculation shows that there is a strong cancellation between 3point
loop corrections, often parameterized via form factors, and 4-point
loop corrections, often written as contact terms restoring gauge invariance.
In addition it is shown that the form factors usually taken in
phenomenological approaches, may not be realistic. In a microscopic
model the form factors are necessarily complex, with cusp structures in
the real part. Non-trivial structures of the form factors extracted from a
microscopic calculation were also observed in[4].
[1] A.Yu. Korchin and O. Scholten, Phys. Rev. C68, 045206 (2003)
[2] K. Ohta, Phys. Rev. C40, 1335 (1989); S. Kondratyuk and
O. Scholten, Nucl. Phys. A677, 396 (2000)
[3] R.M. Davidson and R. Workman, Phys. Rev. C63, 025210 (2001);
and Phys. Rev. C63, 058201 (2001)
[4] S. Kondratyuk and O. Scholten, Phys. Rev. C64, 024005 (2001)
HK 13.16 Tue 13:30 Foyer
Naturprinzipen des Aufbaus der Atomkerne — •Bogdan Ivassivka
— Hauptstrasse 66, 97616 Bad Neustadt a. d. Saale
¿ Die Naturkraefte, die den Kern zusammenhalten, mathematische
Formel der ¿ zusammenpressenden Kraefte, die zwei, drei oder vier Protonen
des stabilen ¿ Blocks zusammenhalten. Darstellung der weiteren
acht stabilen Isotope: ¿ Natrium, Magnesium, Aluminium, Silizium,
Phosphor, Schwefel, Chlor und ¿ Argon des Periodensystems. ¿ Vergl.
Elektrogravitative Natur der Atom- und Kernkraefte; Naturprinzipien ¿
des Aufbaus der Atomkerne, ISBN 3-8330-0345-6; Naturprinzipen des
Aufbaus ¿ der Atomkerne, Fruehjahrstagung Hadronen und Kerne, 20.
Maerz 2001 ¿ Universitaet Erlangen-Nuernberg ¿

Nuclear Physics Tuesday
HK 14 Poster Session: Heavy Ions
Time: Tuesday 13:30–15:30 Room: Foyer
HK 14.1 Tue 13:30 Foyer
Isospin dependence in the production of heavy-element
nucleifrom complete-fusion neutron-evaporation reactions —
•Alexander Yakushev 1 , Willy Bruechle 2 , Egon Jaeger 2 ,
Matthias Schaedel 2 , Erwin Schimpf 2 , Andreas Tuerler 1 , and
Birgit Wierzinski 1 — 1 Institut fuer Radiochemie TU Muenchen —
2 Gesellschaft fuer Schwerionenforschung mbH
This work is aimed at investigations on the projectile isospin dependence
of heavy element fusion-evaporation residue cross sections at
Coulomb barrier energies. For this, it is planned to exploit the potential
of radioactive ion-beam facilities like SPIRAL which shall provide n-rich
radioactive ion beams. The system Ar on Sm is a well studied heavy-ion
reaction. The wide span of Sm nuclides ranging from 144-Sm to 154-Sm
provided the basis to study different projectile-target-Z combinations.
The goal of this work is to extend these studies to probe the neutron
excess in radioactive Ar projectiles - up to 44-Ar - on the evaporation
residue cross section at near barrier energies. Hg as the complete-fusion
n-evaporation product is chemically well studied, mainly as the lighter
homologue of element 112. Highly efficient separation and detection techniques
are at hand to identify individual nuclei. This provides us with
an important advantage over other techniques; e.g. those which do not
measure evaporation residue cross section but indirectly infer fusion cross
sections from fission measurements. A first experiment with 36-Ar beam
was performed at GSI. The cross sections for 2n-, 3n-, 4n- and 5n-neutron
evaporation channels were measured for the complete fusion reaction 36-
Ar + 148-Sm.
HK 14.2 Tue 13:30 Foyer
Baryon Nuggets in Heavy Ion Collisions — •Kerstin Paech
and Adrian Dumitru — Institut fuer Theoretische Physik Universität
Frankfurt
We introduce a model for the real-time evolution of a relativistic fluid
of quarks coupled to non-equilibrium dynamics of the long wavelength
(classical) modes of the chiral condensate. We solve the equations of
motion numerically in 3+1 space-time dimensions.
Starting the evolution at high temperature in the symmetric phase,
we study dynamical trajectories that either cross the line of first-order
phase transitions or evolve through its critical endpoint.
For those cases, we study the formation of baryon density fluctuations
in dependence on different initial conditions.
HK 14.3 Tue 13:30 Foyer
Why a long-lives source can be compatible with HBT measurements
— •Thorsten Renk — Technische Universität München
The common interpretation of HBT data measured at top SPS energies
leads to apparent source lifetimes of 6–8 fm/c and emission duration of
approximately 2–3 fm/c. We investigate a scenario with continuous pion
emission from a long-lived (∼ 17 fm/c) thermalized source in order to
show that it is not excluded by the data. Starting from a description of
the source’s spacetime expansion based on gross thermodynamical properties
which is well tested for several observables, we introduce the pion
emission function with a contribution from continuous emission during
the source’s lifetime and another contribution from final breakup and
proceed by calculating the HBT parameters Rout and Rside. The results
are compared with experimental data measured at SPS for 158 AGeV
central Pb-Pb collisions. We achieve good agreement with the data, provided
that some minor modifications of the fireball evolution scenario are
made. We find that the parameter Rout is not sensitive to the fireball
lifetime, but only to the duration of the final breakup, in spite of the fact
that emission takes place throughout the whole lifetime.
Work supported in part by BMBF and GSI.
HK 14.4 Tue 13:30 Foyer
Light clusters in nuclear matter of finite temperature — •M.
Beyer 1 , S. Strauss 1 , P. Schuck 2 , and S.A. Sofianos 3 — 1 FB
Physik, U Rostock, Germany — 2 IPN Orsay, France — 3 UNISA, Pretoria,
South Africa
We investigate properties and the distribution of light nuclei (A < 4)
in symmetric nuclear matter of finite temperature within a microscopic
framework. For this purpose we have solved few-body Alt-Grassberger-
Sandhas type equations for quasi-nucleons that include self-energy cor-
rections and Pauli blocking in a systematic way. In a statistical model
we find a significant influence in the composition of nuclear matter if
medium effects are included in the microscopic calculation of nuclei. If
multiplicities are frozen out at a certain time (or volume), we expect significant
consequences for the formation of light fragments in a heavy ion
collision. Indeed the systematic inclusion of medium effects leads to an
ordering of multiplicities opposite to the law of mass action of ideal components.
This is necessary to explain the large abundance of α-particles
in a heavy ion collision that are otherwise largely suppressed in an ideal
equilibrium scenario.
Work supported by Deutsche Forschungsgemeinschaft.
HK 14.5 Tue 13:30 Foyer
Dilepton Analysis in the HADES Spectrometer for C+C at 2
AGeV Data — •J. Otwinowski for the HADES collaboration — II.
Physikalisches Institut, Universität Gießen
The light meson dilepton analysis in the HADES detection system is
based on an invariant mass reconstruction of their decay into e + e − . Methods
of the dilepton signal reconstr uction in the HADES spectrometer will
be presented. Particulary important is the reduction of a huge combinat
orial background coming out from wrong combinations of positrons and
electrons. A purity of the signal recons truction is determind by using
the GEANT simulation with a realistic HADES geometry and detector
response.
HK 14.6 Tue 13:30 Foyer
Statistical description for hadron production by means of
anisotropic momentum distributions — •Bjoern Schenke
and Carsten Greiner — Institut für Theoretische Physik, Johann
Wolfgang Goethe Universität Frankfurt, Robert-Mayer-Str. 8-10, 60054
Frankfurt
The various experimental data at AGS, SPS and RHIC energies on
hadron particle yields are investigated by employing a generalized statistical
operator, which allows for a well-defined anisotropic momentum
distribution of each particle species, specified by a common streaming velocity.
It is found that the individual particle ratios are rather insensitive
on this new intensive parameter. This leads to the important conclusion
that, when applying a statistical treatment to descibe the various experimentally
measured hadronic particle ratios, a succesful reproduction of
those does not imply the common conclusion, that one has a state of
almost complete thermal equilibrium at hadrochemical freeze-out.
HK 14.7 Tue 13:30 Foyer
Study of Open Charm production at SPS — •Wilrid Ludolphs
for the CERES collaboration — Physikalisches Institut der Universität
Heidelberg
Heavy ion collisions at ultra-relativistic energies offer the possibility to
study the behaviour of nuclear matter at high density and temperature
where one expects the existence of the quark gluon plasma. The J/Ψ
suppression has been studied as a possible signature, but it is only meaningful
if the overall charm production rate is known.
The production of charm quarks in nuclear collisions is a hard process
and should be describable in perturbative QCD. However, no measurement
of open charm hadrons in nuclear collisions has been performed yet
while there are indirect indications for a substantial enhancement.
The CERES collaboration therefore attempts a study of D meson production
focussing on the 2-body (D 0 → Kπ, 3.8%, cτ = 123.4µm) and
3-body (D → Kππ, 9.1%, cτ = 315µm) decay mode. The analysis is
based on the reconstruction of secondary vertices using the silicon drift
chambers located approximately 10 cm behind the target. An investigation
will be presented on the effectiveness of various cut strategies to
reduce the combinatorial background and on the resulting signal/noise
ratios for D meson detection.
HK 14.8 Tue 13:30 Foyer
New results from the CERES Electron Pair Spectrometer in
Pb-Au collisions at 158 GeV/c per nucleon. — •Sergey Yurevich
for the CERES collaboration — Physikalisches Institut der Universität
Heidelberg
In 2000 the CERES/NA45 experiment at the CERN SPS measured
e + e − pair production in Pb-Au collisions at 158 GeV/c per nucleon. The

Nuclear Physics Tuesday
data sample taken during the 2000 run comprises about 32 million central
collisions. The upgrade of the experimental setup with the radial
drift TPC has improved the mass resolution and increased the rejection
power as well as electron identification. Latest results on low-mass pair
analysis will be presented.
HK 14.9 Tue 13:30 Foyer
Electron identification with CERES — •Oliver Busch —
Gesellschaft für Schwerionenforschung, Darmstadt, Germany
The CERES experiment measures low-mass dilepton production in
heavy-ion collisions at the CERN SPS. The traditional electron reconstruction
strategy combines electron identification and standalone tracking
in 2 Ring Imaging Çerenkov (RICH) detectors. After the CERES
upgrade, the CERES radial TPC provides powerful tracking and momentum
reconstruction capabilities. This motivates new analysis strategies
to separate tracking, particle identification, and rejection of electron
pairs from physically trivial sources. We present track dependent methods
for RICH ring reconstruction applied to data from Pb-Au collisions
at 158 AGeV.
HK 14.10 Tue 13:30 Foyer
Measurements of neutral mesons in d-Au at RHIC with the
STAR EMC — •Oleksandr Grebenyuk — NIKHEF, Kuislaan 409,
1098 SJ Amsterdam, The Netherlands
O. Grebenyuk, NIKHEF Amsterdam and University of Utrecht, The
Netherlands
(for the STAR Collaboration)
For the year 2003 run half of the STAR electromagnetic calorimeter
covering 0 < η < 1 and full azimuth was installed and operational. The
layout and performance of this calorimeter will be described. The present
analysis of the EMC data focuses on neutral meson production at large
pT in d-Au collisions at √ s = 200 GeV per nucleon. Such measurements
will provide insight in the production mechanisms of high pT particles
and help interpreting the suppression of these particles in Au-Au interactions.
HK 14.11 Tue 13:30 Foyer
Centrality Dependence of π − -π − -correlations in Pb+Pb collisions
at 40 and 160 AGeV at the CERN SPS ∗ — •C. Alt 1 , C.
Blume 1 , P. Buncic 1 , P. Dinkelaker 1 , D. Flierl 1 , V. Friese 2,3 ,
M. Gazdzicki 1 , M. Kliemant 1 , S. Kniege 1 , I. Kraus 2 , B. Lungwitz
1 , C. Meurer 1 , M. Mitrovski 1 , S. Radomski 2 , R. Renfordt 1 ,
A. Richard 1 , A. Sandoval 2 , R. Stock 1 , and H. Ströbele 1 for
the NA49 collaboration — 1 Institut für Kernphysik, Universität Frankfurt
— 2 Gesellschaft für Schwerionenforschung (GSI), Darmstadt —
3 Fachbereich Physik der Universität, Marburg
In order to analyse the dependence of hadronic observables on centrality
the NA49 experiment collected minimum bias data on Pb+Pb
collisions at 40 and 160 AGeV.
The investigation of the momentum correlations of identical bosons
(HBT) yields information about the spatial and temporal evolution of
the particle emitting source in heavy ion collisions. The dependence
of the measured HBT parameters on centrality reflects the freeze-out
conditions at various impact parameters. We will present HBT radii in
different centrality classes at 40 and 160 AGeV and discuss their relation
to model parameters describing the freeze-out process. We observe increasing
HBT radii with decreasing impact parameter. This is consistent
with the naive picture of a larger source at higher centrality.
∗ Work supported in part by BMBF and GSI.
HK 14.12 Tue 13:30 Foyer
System size dependence of strangeness production at 158
A·GeV ‡ — •I. Kraus 1 , C. Alt 2 , C. Blume 2 , P. Buncic 2 , P.
Dinkelaker 2 , D. Flierl 2 , V. Friese 1,3 , M. Gazdzicki 2 , M. Kliemant
2 , S. Kniege 2 , B. Lungwitz 2 , M. Meurer 2 , M. Mitrovski 2 ,
S. Radomski 1 , R. Renfordt 2 , A. Richard 2 , A. Sandoval 1 , R.
Stock 2 , and H. Ströbele 2 for the NA49 collaboration — 1 Gesellschaft
für Schwerionenforschung (GSI), Darmstadt — 2 Institut für Kernphysik,
Universität Frankfurt — 3 Fachbereich Physik der Universität, Marburg
In heavy ion collisions at the top CERN-SPS energy the transition to
a deconfined state of strongly interacting matter is expected. With the
large acceptance hadron spectrometer NA49 data on Pb+Pb, as well as
on elementary p+p collisions have been collected. In order to study the
transition between these extreme cases and to gain deeper insight into
the transition from a hadronic to a partonic state, medium size systems
(C+C and Si+Si) have been analysed in addition. Spectra and yields of
π-, K- and φ- mesons as well as Λ- and ¯Λ-hyperons were measured.
The yields of strange particles per pion show a rapid rise with increasing
system size, followed by a saturation above approx. 60 participants.
This can be explained in the framework of statistical models by the transition
from canonical to grand canonical ensembles. The rapidity spectra
of the hyperons show increasing stopping. Furthermore, the transverse
mass spectra flatten with increasing system size. This indicates the incidence
of collective effects, which leads to the qualitative difference between
heavy ion collisons and the superposition of p+p interactions.
‡ Supported by BMBF and GSI
HK 14.13 Tue 13:30 Foyer
Centrality Dependence of Neutral Pion Production in d+Au
Collisions at √ s NN = 200 GeV — •Henner Büsching for the
PHENIX collaboration — Brookhaven National Laboratory, Upton, NY
11973-5000, USA
The suppression of high pT neutral pions in central Au+Au collisions
relative to the binary scaled p+p results has been one of the most significant
observations at RHIC. The observed suppression may be interpreted
as the effect of energy loss of the initially hard-scattered partons as they
traverse the hot and dense matter produced in central Au+Au collisions.
However, other theoretical studies interpret the suppression as an initial
state effect, such as due to gluon saturation.
In d+Au collisions, where no hot and dense matter is produced in the
final state, the hard-scattered partons propagate and fragment in QCD
vacuum. Initial state effects, however, are equally present in both d+A
and A+A collisions, allowing the d+Au neutral pion results to provide a
baseline measurement to separate initial and final state effects.
We present the PHENIX results on the centrality dependence of the
neutral pion production in d+Au collisions.
HK 14.14 Tue 13:30 Foyer
Mid-Rapidity Neutral Pion Production in Proton-Proton Collisions
at √ s = 200 GeV — •Stefan Bathe for the PHENIX collaboration
— University of California at Riverside, Department of Physics,
Riverside, CA 92521-0413, USA
The cross section of neutral pion production at mid-rapidity was measured
in proton-proton collisions as part of the third year of the RHIC
program.
Neutral pion production in proton-proton collisions serves as an essential
reference in understanding particle production in Au+Au and d+Au
collisions. Furthermore, a comparison of the results to next-to-leading
order pQCD calculations provides important insight in the theoretical
understanding of the measurement of the double-spin, longitudinal asymmetry
ALL.
First results on the cross section measurement will be presented. As
compared to the measurement from the second RHIC physics run, it is
intended to increase the precision and extend the transverse momentum
range.
HK 14.15 Tue 13:30 Foyer
Calculation of the track length and time of flight in ALICE
central barrel detectors — •Sylwester Radomski for the ALICE
collaboration — Gesellschaft fuer Schwerionenforschung mbH
The ALICE experiment, currently under construction, is designed for
the investigation of the heavy ion reactions at LHC collider. The central
barrel of the ALICE experiment is composed out of three tracking
detectors: ITS, TPC, TRD and TOF detector. Tracks are reconstructed
and fit by the algorithm based on the Kalman Filter. The separation between
5pB/K and p/K is performed by combining the information of the
track length and time–of–flight hypothesis from the track reconstruction
and time–of–flight measurement from TOF detector. In this talk the
algorithms of the calculation of the track length and the corresponding
time–of–flight hypothesis, for different particle types, are described.
The results of the simulation studies are presented and compared with
theoretical estimations. The impact of the track length and momentum
resolution on the calculated time–of–flight resolution is investigated. The
importance of this study for electron identification in ALICE is pointed
out.

Nuclear Physics Tuesday
HK 15 Poster Session: Nuclear and Particle Astrophysics
Time: Tuesday 13:30–15:30 Room: Foyer
HK 15.1 Tue 13:30 Foyer
Tritium related components of the KATRIN Experiment —
•Frank Eichelhardt for the KATRIN collaboration — Universität
Karlsruhe, Institut für exp. Kernphysik
The KArlsruhe TRItium Neutrino experiment investigates spectroscopically
the electron spectrum from tritium β decay 3 H → 3 He+e − +¯νe
near its kinematical endpoint of 18.6keV. With a strong windowless
molecular gaseous Tritium source (WGTS) and a high resolution electrostatic
filter of unprecedented energy resolution, KATRIN will allow
a model-independent measurement of neutrino masses with an expected
sensitivity of 0.2eV (90% CL).
The T2 injection rate into the WGTS is up to 0.4mbarls −1
while the maximum allowed flow rate into the pre-spectrometer is
2.5·10 −11 mbarls −1 . The necessary suppression of at least 10 10 has to be
provided by differential pumping sections (DPS) and cryogenic pumping
systems (CPS), which are located between source and spectrometer.
This report focuses on the present status of the design of tritium related
parts of KATRIN including the WGTS, DPS and CPS as well as on
ongoing prototype measurements.
Funded in part by the German BMBF Förderschwerpunkt Astroteilchenphysik
under 05CK1VK1/7 and 05CK1UM1/5.
HK 15.2 Tue 13:30 Foyer
Investigations of trapping conditions in-between the MAC-E-
Filters of the KATRIN experiment. — •Kathrin Essig for the
KATRIN collaboration — Helmholtz-Institut für Strahlen- und Kernphysik,
Rheinische Friedrich-Wilhelms-Universität, D-53115 Bonn
The KArlsruhe TRItium Neutrino experiment KATRIN[1] aims to determine
the absolute mass of the electron antineutrino by measuring the
endpoint region of the tritium-β-spectrum with sub-eV sensitivity. The
KATRIN setup consists of two MAC-E-Filter (Magnetic Adiabatic Collimation
followed by Electrostatic Filter) spectrometers, one low resolution
pre-spectrometer followed by a high resolution main-spectrometer.
The electric and magnetic field configurations of this lined up spectrometers
yield to penning trap conditions for electrons. These trapped
electrons are thought of as a major source of background events, hence
their number has to be minimized. The aim of this talk is to discuss
the trapping conditions of electrons based on computer simulations and
to present methods to remove them or to minimize their storage time.
Therefore cooling processes like synchrotron radiation and residual gas
interactions due to elastic and inelastic scattering or ionization have been
studied. Besides cooling there is still the option of an active removal of
stored particles by the pre-spectrometer’s electric dipole fields.
Supported by the BMBF under contract 05CK2PD1/5.
[1] A. Osipowicz et al. (KATRIN coll.), hep-ex/0109033
HK 15.3 Tue 13:30 Foyer
Background measurements with the Mainz Neutrinomassexperiment
— •Björn Flatt for the KATRIN collaboration — Johannes
Gutenberg Universität, 55099 Mainz
After the completion of the tritium runs with the Mainz Neutrinomassexperiment
in 2001 the spectrometer was devoted to background
studies in perspective of the successor experiment KATRIN (KArlsruhe
TRItium Neutrino experiment). These studies include the modifications
of the electrode systems and measurements with artificial background
sources, e.g. X-rays induced and decay of 83 Kr in the spectrometer and
aim to understand the background of MAC-E-Filters (Magnetic Adiabatic
Collimation and Electrostatic Filter) by stored particles and by
electrons from the electrodes and the walls induced by cosmic rays or
radioactive impurities.
In the talk the results of the measurements and the implications for
KATRIN will be shown.
Supported by BMBF Förderschwerpunkt Astroteilchenphysik under
Nr. 05CK1VK1/7 and 05CK1UM1/5.
HK 15.4 Tue 13:30 Foyer
Beam induced background at the LUNA 400 kV underground
accelerator facility — •Daniel Bemmerer for the LUNA collaboration
— Institut für Atomare Physik und Fachdidaktik, Technische
Universität Berlin, Germany
At the LUNA 400 kV accelerator facility [1] at Laboratori Nazionali
del Gran Sasso, Italy, the background due to cosmic ray induced muons
is reduced by six orders of magnitude due to the rock overburden. In order
to study radiative-capture cross sections at astrophysically relevant
energies, also the background induced by the ion beam itself has to be
reduced. Currently, the 14 N(p,γ) 15 O reaction is being investigated by the
LUNA collaboration using a windowless gas target system [2]. In preparation
for these studies, background from the 2 D(p,γ) 3 He, 13 C(p,γ) 14 N
and other reactions has been identified, localized and significantly reduced.
[1] A. Formicola et al., Nucl. Inst. Meth. A 507 (2003) 609-616.
[2] C. Casella et al., Nucl. Inst. Meth. A 489 (2002), 160-169.
HK 15.5 Tue 13:30 Foyer
GENIUS Test Facility Started in GRAN SASSO. — •Irina
Krivosheina, Hans Volker Klapdor-Kleingrothaus, Oleg
Chkvorets, Claudia Tomei, and Herbert Strecker —
Max-Planck-Institut fuer Kernphysik, Saupfercheckweg 1, D-69117
HEIDELBERG, GERMANY
The first four naked high purity Germanium detectors were installed
successfully in liquid nitrogen in the GENIUS-Test-Facility (GENIUS-
TF) in the GRAN SASSO Underground Laboratory on May 5, 2003.
This is the first time ever that this novel technique aiming at extreme
background reduction in search for rare decays is going to be tested underground.
First operational parameters are presented.
HK 15.6 Tue 13:30 Foyer
Metal loaded liquid scintillators — •Christian Buck, F.X. Hartmann,
D. Motta, S. Schönert, and U. Schwan — Max Planck
Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg
The development of metal based liquid scintillator systems is important
towards the next generation low energy solar neutrino, reactor antineutrino
and double-beta decay experiments. One approach to develop
stable scintillator systems containing In (solar neutrinos), Gd (reactor
neutrinos) or Nd (neutrinoless double-beta decay) is the use of metal
beta-diketonate complexes.
The optical properties of these metal loaded scintillators will be reported.
Furthermore the energy transfer between the various components
in a liquid scintillator will be discussed. The In-system was investigated
in most detail. Results of a highly loaded In-scintillator used in a prototype
detector at the underground laboratory in Gran Sasso, Italy will be
presented.
HK 15.7 Tue 13:30 Foyer
A Prediction of Cosmic Rays from Nearby Black Holes’ Activity
— •Oana Tascau, Peter Biermann, and Ralf Ulrich —
MPIFR
The Falcke Biermann model of a jet disk which explain the radio to
infrared spectrum of the black hole camdidate was apply for many relativistic
jet systems and in this pariculary case for the radio emission at
the base of the jet of the black holes candidates within 50 Mpcs. The
data from AGASA and HiRes were fitted showing a possible difference
in spectrum between north and south.

Nuclear Physics Tuesday
HK 16 Nuclear Structure/Spectroscopy II
Time: Tuesday 15:30–18:30 Room: A
Group Report HK 16.1 Tue 15:30 A
The neutron-rich Na and Mg isotopes — •Heiko Scheit for the
REX-MINIBALL collaboration — Max-Planck-Institut für Kernphysik,
Heidelberg
More than 30 years after the first observation of the neutron-rich Na
isotopes (at ISOLDE) the unusual properties of the Na and Mg isotopes
in the vicinity of the N = 20 shell closure are still not fully understood.
The existing experimental data are sparse and sometimes even contradictory,
e.g. the measured B(E2; 0gs → 2 + 1 ) values of the even-even isotopes
30,32 Mg deviate by as much as a factor of two from each other[1-3].
The recently commissioned REX accelerator for exotic nuclei at
ISOLDE together with the modern HPGe array MINIBALL offers the
opportunity to study the collective and single particle properties of
these nuclei with standard nuclear physics tools such as (sub Coulomb
barrier) Coulomb excitation and single-nucleon transfer reactions in
inverse kinematics.
After giving a short introduction of REX and MINIBALL I will summarize
the current status of research on the neutron-rich Na and Mg
isotopes with special emphasis on our new results from REX-ISOLDE
with the MINIBALL array.
[1] T. Motobayashi et al., Phys. Lett. B346 , 9 (1995).
[2] B.V. Pritychenko et al., Phys. Lett. B461 , 322 (1999).
[3] V. Chiste et al., Phys. Lett. B514, 233 (2001).
Group Report HK 16.2 Tue 16:00 A
New Insights into the Fission Barrier Landscape of Light
Actinides ∗ — •P.G. Thirolf 1 , M. Csatlós 2 , T. Faestermann 3 ,
G. Graw 1 , D. Habs 1 , J. Gulyás 2 , M.N. Harakeh 4 , R. Hertenberger
1 , M. Hegelich 1 , M. Hunyadi 2 , A. Krasznahorkay 2 ,
H.J. Maier 1 , Z. Máté 2 , J. Szerypo 1 , and H.-F. Wirth 1 —
1 Ludwig-Maximilians-Universität München — 2 Inst. of Nucl. Res. of
the Hung. Acad. of Sci., Debrecen — 3 Technische Universität München
— 4 Kernfysisch Versneller Instituut, Groningen
Transmission resonance spectroscopy in 236 U has been performed with
high resolution, resulting in the identification of rotational band structures
corresponding to hyperdeformed configurations. From the level
density an excitation energy of the ground state in the third minimum
of 3.30±0.4 MeV could be determined [1], thus confirming the existence
of a rather deep third minimum, similar to our previous findings in 234 U
[2]. The excitation energy of the lowest hyperdeformed transmission
resonance and the energy dependence of the fission isomer population
probability enabled the determination of the height of the inner fission
barrier EA =5.15 ±0.20 MeV. This significant lowering of the inner barrier
height compared to previously believed values in the presence of a
deep third well may be a general feature in the light actinides, giving rise
to the existence of short-lived fission isomers. First experiments searching
for ps shape isomers in light uranium isotopes will be presented. [1]
M. Csatlós et al., submitted to Phys. Lett.
[2] A. Krasznahorkay et al., Phys. Lett. B461 (1999) 15.
∗ Supported by the DFG and Maier-Leibnitz-Laboratorium, Garching
HK 16.3 Tue 16:30 A
From spherical 34Si to deformed 32Mg: static moments of
neutron rich Al-isotopes — •Pieter Himpe 1 , Gerda Neyens 1 ,
Dana Borremans 1 , Nele Vermeulen 1 , Deyan Yordanov 1 ,
Ketel Turzo 1 , Stephen Mallion 1 , Nadya Smirnova 2 , Georgi
Georgiev 3 , Jean-Michel Daugas 4 , Victor Meot 4 , Iolanda
Matea 3 , Dimiter Balabanski 5 , Yu.E. Penionzhkevich 6 , M
Staniou 3 , Francois De Oliveira Santos 3 , Gilles de France 3 ,
and Magda Kowalska 7 — 1 Dept. Natuurkunde, KULeuven —
2 Ghent University — 3 GANIL — 4 Bruyeres le Chatel — 5 St. Kliments
Ohridsky University of Sofia — 6 JINR-Dubna — 7 Inst. fur Physik,
Univ. Mainz
In 1975 Thibault et al. discovered that 31-32Na are much stronger
bound than expected. Today we know that this is due to low lying intruder
states in this region, called ’the island of inversion’. The ground
state of 34Si (Z=14) is not influenced by the intruder states, while 32Mg
(Z=12), on the contrary, is a well deformed nucleus.
Using the NMR technique on polarised Al nuclei we measured the gfactor
of 32-33Al, nuclei in between 34Si and 32Mg, using a polarized
fragment beam from the LISE separator at GANIL. These results give
an indication that the ground state of 32Al is normal and that the 2p-2h
intruder state influences the ground state of 33Al. In the future we will
measure the quadrupole moment of these nuclei to get more insight on
their deformation.
HK 16.4 Tue 16:45 A
Optical polarization and β-asymmetry measurement on
neutron-rich magnesium isotopes — •M. KOWALSKA 1 , K.
BLAUM 2 , D. BORREMANS 3 , S. GHEYSEN 3 , P. HIMPE 3 , S.
MALLION 3 , P. LIEVENS 3 , R. NEUGART 1 , G. NEYENS 3 , N.
VERMEULEN 3 , and D. YORDANOV 3 — 1 University of Mainz,
Germany — 2 ISOLDE-CERN, Switzerland — 3 K.U. Leuven, Belgium
The properties of neutron-rich Mg isotopes around N = 20 are very
much influenced by intruder states from the f7/2 shell entering into the sp
shell. This “island of inversion” is a challenge for nuclear shell-model calculations,
and measurements of magnetic dipole and electric quadrupole
moments are important as an experimental basis. For this purpose we
have recently tested the conditions of β-NMR spectroscopy on short-lived
Mg isotopes. 60 keV ion beams of 29 Mg, 31 Mg and 33 Mg, produced by
the RILIS ion source at ISOLDE-CERN, were polarized by collinear optical
pumping with frequency-doubled laser light at 280 nm and were
implanted into a cubic MgO crystal. Observation of the β-decay asymmetry
as a function of the Doppler-tuned optical excitation frequency
reveals the hyperfine structure of 29 Mg and 31 Mg in the 3s 2 S1/2 → 3p
2 P3/2 resonance transition. Preliminary information from these measurements
about the involved spins and magnetic moments will be discussed.
The observed asymmetries of up to 6% will allow us to perform accurate
β-NMR measurements, from which g-factors and quadrupole moments
can be deduced.
HK 16.5 Tue 17:00 A
Shell-Model Description of Monopole Shifts in Neutron-Rich
Cu Nuclei — •Anneleen De Maesschalck, Nadya A. Smirnova,
Annelies Van Dyck, and Kris Heyde — Institute for Subatomic and
Radiation Physics, Ghent University, Proeftuinstraat 86, 9000 Gent, Belgium
The nuclear mean field and its corresponding magic numbers have been
determined predominantly by the study of nuclei in or near the valley of
β-stability. When moving out of this valley towards proton- or neutronrich
nuclei, changes in the nuclear mean field are expected to appear.
We have studied changes in the nuclear mean field for neutron-rich nuclei
with shell model techniques. The main contribution to the change
comes from the monopole part of the effective two-body proton-neutron
interaction. We have investigated low-lying states in odd-A Cu nuclei,
for which recent experimental data have been obtained [1], [2], [3]. Both
schematic and realistic (obtained with a G-matrix [4]) forces have been
used, and the monopole shifts obtained with these forces are compared
with the results from large-scale shell model calculations, where the same
realistic force has been used; in this way, two-body correlations beyond
the mean field are brought into account.
[1] S. Franchoo et al., Phys. Rev. C 64 (2001), 054308.
[2] J. Van Roosbroeck et al., submitted.
[3] N.A. Smirnova, A. De Maesschalck, A. Van Dyck, K. Heyde, submitted.
[4] M. Hjorth-Jensen, T.T.S. Kuo, E. Osnes, Phys. Rep. 261 (1995) 125.
HK 16.6 Tue 17:15 A
A measure for γ-deformation in heavy nuclei — •C. Scholl, V.
Werner, and P. von Brentano — Institut für Kernphysik, Universität
zu Köln
A way to measure the γ-deformation of a nucleus is found by analysis
of shape invariants. While β and γ are deformation parameters in the
geometrical model, they are not always easy to define in all cases, e.g.,
in vibrational nuclei. The shape invariants K3 and K4 are connected to
effective β- and γ- deformation parameters by simple formulas. In general,
they are given by huge sums over matrix elements. Nevertheless,
introducing the Q-phonon scheme and its selection rules, it was shown [1]
that a good approximation to K4 can be given involving only two B(E2)
values in the ground state band. Using the same approximation for K3
one can identify this quantity with the quadrupole moment of the first

Nuclear Physics Tuesday
excited 2 + state, but deviations are found to be large within the IBM.
In a second approximation an inclusion of the B(E2) strengths of the
2 + γ (in a vibrator the two-phonon 2 + ) state lead to an accuracy of the
approximation within a few percent in the IBM. That means fitting a two
parameter Hamiltonian to data, the value of K approx
3 corresponds to the
value of K3 with an accuracy of a few percent. K3 and the corresponding
effective γ-deformation parameter are given for a collection of nuclei.
[1] V. Werner et al., Phys. Lett. B 521 (2001) 146.
∗ supported by the DFG under contract Br799/11-1
HK 16.7 Tue 17:30 A
First observation of the scissors mode decay to the γ-band in a
well-deformed nucleus ∗ — •V. Werner 1 , N. Pietralla 2 , M.W.
Ahmed 3 , P. von Brentano 1 , C. Fransen 1 , H. von Garrel 4 , U.
Kneissl 4 , C. Kohstall 4 , A. Linnemann 1 , S. Müller 5 , H.H. Pitz 4 ,
D. Savran 5 , M. Scheck 4 , F. Stedile 4 , A. Tonchev 3 , S. Walter 4 ,
H.R. Weller 3 , and Y. Wu 3 — 1 Institut für Kernphysik, Universität
zu Köln — 2 SUNY, Stony Brook, NY — 3 FELL, Dept. of Physics,
Duke University, Durham, NC — 4 Institut für Strahlenphysik, Universität
Stuttgart — 5 Institut für Kernphysik, TU Darmstadt
Various experiments on 164 Dy in the 80’s and 90’s left ambiguities
in the placement of some γ-transitions. Todays improved NRF setup
in Stuttgart allowed a reinvestigation with increased sensitivity. γ-rays
were observed in an experiment above the energy threshold of about 3
MeV of the scissors mode, while the corresponding lines were missing
when tuning the maximum energy of the incident photons just below
that energy. Another experiment was performed at the new NRF setup
[1] at the FELL at Duke University using an almost monochromatic and
totally polarized photon beam. The polarization allowed firm parity assignments,
and the well-defined energy ensured that one of the mentioned
γ-rays stems from a so far only presumed level at 3.1 MeV. While the
ground state decay of that level is unexpectedly weak, the observation
backs a placement of so far unobserved decays of the scissors mode to the
γ-band. Transition strengths are in agreement with IBM predictions.
[1] N. Pietralla et al., Phys. Rev. Lett. 88 (2002) 012502.
∗ supported by the DFG under Br799/11-1, Kn153/31-2, and Pi 393/1-2.
HK 16.8 Tue 17:45 A
Investigation of Shape Coexistence in 106 Cd — •A. Linnemann,
C. Fransen, J. Jolie, D. Mücher, and V. Werner — Institut für
Kernphysik, Universität zu Köln
Excellent examples of quasi-complete structures representing shape coexistence
have been observed during the last decade in the Cd-isotopes
e.g. ref[1]. These isotopes form a great test of shape coexistence as here
the intruder states have their lowest excitation energy (at mid shell) exactly
at the line of stability. This allows the unique possibility to study
the six even-even Cd isotopes in an complete way as possible. We have
studied recently the lightest stable of those, 106 Cd, using the reactions
104 Pd(α, 2n) 106 Cd, 105 Pd( 3 He, 2n) 106 Cd and the β-decay 106 Cd(p, n) 106 In
with the HORUS-Spectrometer at the Cologne FN-Tandem accelerator.
First results of the analysis will be presented.
[1] M. Kadi, N. Warr, P. E. Garrett, J. Jolie, S. W. Yates, Phys. Rev.
C68 (2003) 031306
HK 16.9 Tue 18:00 A
Search for Hyperdeformation in 126 Ba ∗ — •A.K. Singh 1 , A. Al-
Khatib 1 , A. Bürger 1 , P. Bringel 1 , H. Hübel 1 , A. Neußer 1 ,
G.B. Hagemann 2 , B. Herskind 2 , C.R. Hansen 2 , G. Sletten 2 , D.
Curien 3 , A. Maj 4 , A. Lopez-Martens 5 , A. Bracco 6 , P. Fallon 7 ,
and B.M. Nyakó 8 for the EUROBALL collaboration — 1 HISKP, Univ.
Bonn, Germany — 2 NBI, Copenhagen, Denmark — 3 IReS, Strasbourg,
France — 4 IFJ, Krakow, Poland — 5 CSNSM, Orsay, France — 6 Univ.
Milano, Italy — 7 LBNL, Berkely, USA — 8 ATOMIKI, Debrecen, Hungary
A previous search for hyperdeformation in 126 Ba using the GAMMA-
SPHERE array at Berkeley led to the observation of a narrow ridge
structure in the γ-ray continuum corresponding to rotational bands with
a large moment of inertia. This motivated us to search for hyperdeformation
with the EUROBALL spectrometer at IReS, Strasbourg. Two
experiments were performed using the 64 Ni + 64 Ni reaction at beam
energy of 255 and 261 MeV. The first experiment was performed with
EUROBALL in combination with the large volume BaF2 detector array
HECTOR to measure GDR transitions between the highly deformed
states. The second experiment was done in combination with the charged
particle detector DIAMANT for a better selection of reaction channels.
The search for hyperdeformed structures both in the continuum and in
the discrete γ-ray spectrum is going on. So far no convincing discreteline
bands with appropriate statistical significance have been found. ∗
Supported by BMBF (06 BN 907), (Hu 325/10) and EU
HK 16.10 Tue 18:15 A
Microsecond Isomers in the Heavy Indium Isotopes — •A.
Scherillo 1,2 , J. Pinston 3 , J. Genevey 3 , G.S. Simpson 2 , H.
Faust 2 , and J. Jolie 1 — 1 Insitut für Kernphysik, Universität zu Köln,
Köln, Germany — 2 ILL, Grenoble, France — 3 LPSC, Grenoble, France
To extend our knowledge on the structure of the heavy Indium isotopes,
which is very scarse, their microsecond isomers were investigated.
These nuclei were produced by thermal-neutron-induced fission of 239 Pu
and 241 Pu, and separeted using the LOHENGRIN spectrometer at ILL
(Grenoble). The detection system was based on the time correlation
between the incoming fission fragment and the γ-rays or conversion electrons
emitted by the isomer. The decay schemes of the new yrast isomers
in 129,128,127,125,123 In are presented. The experimental results were found
to be in good agreement with a semi-empirical shell model calculation. A
truncated configuration space was used, including only the orbitals πg9/2
for the protons and νs1/2, νd3/2 and νh11/2 for the neutrons. The twobody
matrix elements of the residual interaction were extracted, wherever
possible, from experimental data.
This work was supported by ILL and by the BMBF under research
grant 06K-167/TP2.
HK 17 Electromagnetic and Hadronic Probes II
Time: Tuesday 15:30–18:30 Room: B
Group Report HK 17.1 Tue 15:30 B
New opportunities for hadron physics with the planned PANDA
detector — •james ritman for the panda collaboration — II Phys.
Inst. Univ. Giessen
One of the main components of the approved GSI Future Facility is a
high energy storage ring (HESR) that provides antiproton beams with
unprecedented intensity and momentum definition for beam momenta
between 1.0 and 15 GeV/c. Experiments with internal hydrogen and
nuclear targets will be performed with the PANDA (Pbar ANnihilation
experiemnt at DArmstadt) detector. The questions addressed include
the search for exotic QCD states (glueballs and hybrids), precision spectroscopy
of charmonium states, the properties of charm hadrons in nuclear
matter, and high resolution spectroscopy of (double) hypernuclei.
This talk will provide an overview of the design parameters and simulation
results of the detector facility envisioned to pursue the experimental
program.
Group Report HK 17.2 Tue 16:00 B
First measurements of transverse spin asymmetries at
COMPASS — •Richard Webb 1 , Jens Bisplinghoff 2 , Franco
Bradamante 3 , Wolfgang Eyrich 1 , Horst Fischer 4,5 , Rainer
Joosten 2 , Anna Martin 3 , and Paolo Pagano 3 for the COMPASS
collaboration — 1 Physikalisches Institut, Friedrich-Alexander-
Universität Erlangen-Nürnberg — 2 Helmholtz-Institut für Strahl- und
Kernphysik, Universität Bonn — 3 Università degli Studi and INFN,
Trieste — 4 Albert-Ludwigs-Universität Freiburg — 5 CERN, Geneva
COMPASS is a fixed target experiment on the SPS M2 beamline at
CERN. Its 6 LiD target can be polarised both longitudinally and transversally
with respect to the polarised 160GeV µ + beam. Approximately 20%
of the beam-time in 2002 and 2003 was spent in the transverse configuration.
The analysis of semi-inclusive deep inelastic events in transverse
mode opens up a number of channels to investigate the transverse quark
distribution function ∆Tq(x) and its associated structure function h1.
One of these is the azimuthal asymmetry in single pion production, the
so-called Collins effect. During the 2002 beam time COMPASS collected
approximately 1.2 · 10 7 tranversely polarised SIDIS events, enabling a

Nuclear Physics Tuesday
first determination of the Collins asymmetry. Preliminary results of this
analysis will be reported. This work was supported by the BMBF.
HK 17.3 Tue 16:30 B
Transverse Spin Physics at HERMES — •Ulrike Elschenbroich
for the HERMES collaboration — University of Ghent, Department
of Subatomic and Radiation Physics, Proeftuinstraat 86, B-9000
Ghent
The cross section for deep inelastic lepton scattering off spin 1/2
hadrons can be parameterised in terms of quark distribution functions.
In leading order only three quark distribution functions survive the integration
over transverse quark momenta: i.e. the unpolarised distribution
q(x), the helicity distribution ∆q(x), and the so–called transversity function
h q
1(x).
The latter one is a chiral–odd object and cannot be measured in inclu-
sive deep inelastic scattering. To access h q
1(x), it has to be combined with
e.g. the chiral–odd Collins fragmentation function H ⊥q
1 (z), which enters
the cross section for scattering processes where also a produced hadron is
detected in coincidence. This combination gives rise to a sine–dependence
in the azimuthal hadron production angle. The same cross section con-
tains also the combination of the well–known unpolarised fragmentation
function D q (z) and the distribution function f ⊥q
1T (x) (Sivers function)
which exhibits a different sine modulation. A non–vanishing Sivers function
would indicate a non–zero orbital angular momentum of quarks in
the hadron.
Latest results measured with the longitudinally and transversely polarised
targets of the HERMES experiment at the HERA storage ring
are presented.
HK 17.4 Tue 16:45 B
Measurement of the gluon polarisation using high-pT hadron
pairs — •Sonja Hedicke, H. Fischer, J. Franz, F.H. Heinsius,
M. von Hodenberg, D. Kang, K. Königsmann, I. Ludwig, D.
Matthiä, J. Metzger, C. Schill, D. Setter, S. Trippel, and
E. Weise for the COMPASS collaboration — Physikalisches Institut,
Universität Freiburg
The COMPASS experiment at CERN is studying the nucleon spin
structure in polarised deep inelastic muon scattering. COMPASS is using
a polarised 160GeV muon beam on a polarised 6 LiD target. The
main goal of the COMPASS spin physics programme is the measurement
of the gluon polarisation ∆G/G.
The gluon polarisation is accessible via the photon-gluon-fusion process,
in which hadron pairs with large transverse momenta are produced.
The talk presents the method and status of the analysis of high-pT hadron
pairs in the COMPASS experiment.
The project is supported by the BMBF.
HK 17.5 Tue 17:00 B
Semi-inclusive spin asymmetry from COMPASS — •Alexander
Korzenev for the COMPASS (NA58) collaboration — Institute for Nuclear
Physics, Mainz University
In view of the spin crisis in the QPM the understanding of the spin
structure of the nucleon is the one of the most interesting issues in hadron
physics. The investigation of this subject is the primary goal of the COM-
PASS experiment at CERN. Data obtained by scattering polarized muons
of 160 GeV off a polarized 6 LiD target will be presented.
In addition to the scattered muon, hadrons are also detected allowing
a separation of the spin contributions from different quark and antiquark
flavors. The covered kinematic range is Q 2 > 1 GeV 2 and
0.003 < xBj < 0.2.
HK 17.6 Tue 17:15 B
Longitudinal Λ polarization in the COMPASS experiment —
•Donghee Kang, K. Königsmann, H. Fischer, F.H. Heinsius, J.
Franz, C. Schill, E. Weise, M. von Hodenberg, S. Hedicke, I.
Ludwig, S. Trippel, J. Metzger, D. Setter, and D. Matthiä for
the COMPASS collaboration — Physikalisches Institut, Universität
Freiburg
At the COMPASS experiment at CERN Λ particles are produced in
semi-inclusive deep inelastic scattering process with high statistics. The
main focus of the research is the understanding of the longitudinal Λ polarisation
and the spin transfer mechanism through fragmentation processes.
The Λ polarisation can be studied by measuring the angular distribution
of its decay products. The Monte Carlo studies for the acceptance
corrections and the measurement of the Longitudinal Λ polarisation will
be presented. The project is supported by BMBF.
HK 17.7 Tue 17:30 B
Hadron multiplicities and fragmentation functions at HERMES
— •Achim Hillenbrand for the HERMES collaboration — University
of Erlangen-Nürnberg, Physikalisches Institut II, Erwin-Rommel-Str. 1,
91058 Erlangen
Charge separated hadron multiplicities for Pions, Kaons and Protons
have been extracted from the Proton and Deuterium data of the year
2000. These multiplicities formed the basis for the optimization of the
LUND fragmentation model to HERMES energies. To enable the iterative
fitting of the Monte Carlo data to the experimental multiplicities,
a program was developed that allowed to take into account the detector
smearing effects on a statistical basis without the time consuming
tracking by using a detector model.
The experimental multiplicities have been corrected for influences due
to the HERMES acceptance and radiative effects. The results form the
basis for the extraction of fragmentation functions. The latest results are
presented.
This work was supported by the BMBF (06 ER 928I, 06 ER 125I).
HK 17.8 Tue 17:45 B
Observation of inclusive D 0 and ¯ D 0 production and search
for open charm-anticharm pair production at COMPASS —
•Nicolas Dedek for the COMPASS collaboration — CERN, CH-1211
Geneve 23
The COMPASS experiment at CERN investigates the interaction of
a polarized muon beam of 160 GeV/c momentum and a polarized nucleon
target in order to measure the polarized gluon structure function
of the nucleon. The key reaction is the photon gluon fusion into charm
anticharm.
First results on the inclusive production of D ∗± and D 0 mesons (via
the sequential decay D ∗± → D 0 π, D 0 → Kπ) have been obtained. The
search for associated production of ¯ D 0 Λc and D 0 ¯ D 0 has been started.
HK 17.9 Tue 18:00 B
Azimuthal Distributions and the Cahn Effect at COMPASS —
•Inga Ludwig, H. Fischer, J. Franz, S. Hedicke, F.H. Heinsius,
M. von Hodenberg, D. Kang, K. Königsmann, D. Matthiä, J.
Metzger, C. Schill, D. Setter, S. Trippel, and E. Weise for the
COMPASS collaboration — Physikalisches Institut, Universität Freiburg
One goal of the COMPASS experiment at CERN is the investigation
of transverse momenta of the quarks in the nucleon. In SIDIS the intrinsic
transverse momentum of the quark generates an asymmetry in
the azimuthal angle φ of the leading hadron. Here φ is measured with
respect to the direction of the virtual photon and the lepton-scattering
plane. This asymmetry causes a cos φ- and cos 2φ-modulation in the
count rates, which has been predicted by Cahn in 1987.
In COMPASS a 160 GeV muon beam is scattered off a 6 LiD target.
The status of the data analysis on this subject will be presented.
Work supported by BMBF
HK 17.10 Tue 18:15 B
Radiative Pion Photoproduction and Pion Polarizability — •M.
Rost 1 , S. Cherepnya 2 , L. Fil’kov 2 , V. Kashevarow 2 , and Th.
Walcher 1 for the A2-Collaboration collaboration — 1 Institut für Kernphysik,
Universität Mainz, Mainz, Germany — 2 Lebedev Physical Institute,
Leninscy Prospect 53, Moscow, Russia
The process of radiative π + meson production from the proton γp →
γπ + p is studied with the aim to determine the π + meson polarizability.
For this purpose an experiment on the process study has been carried out
at MAMI-B in the kinematical region 537 < Eγ < 817MeV. A preliminary
π + meson polarizability value is determined from the comparison
of the experimental data with two different theoretical models.

Nuclear Physics Tuesday
HK 18 Instrumentation and Applications II
Time: Tuesday 15:30–18:30 Room: C
HK 18.1 Tue 15:30 C
Particle identification in the HADES experiment ∗ — •T.
Christ 1 , M. Golubeva 2 , R. Holzmann 3 , M. Jaskula 4 , J.
Mousa 5 , P. Salabura 4 , P. Tlusty 6 , T. Wojcik 4 , and D.
Zovinec 3 for the HADES collaboration — 1 TU München, Garching —
2 INR, Moscow, Russia — 3 GSI, Darmstadt — 4 Jagiell. Univ. Cracow,
Poland — 5 Univ. of Cyprus, Nicosia, Cyprus — 6 CAS, Rez, Czech
Republic
The HADES experiment at GSI is designed to reconstruct lepton pairs
from decays of vector mesons produced in hadron and heavy ion induced
nuclear reactions at energies of 1-2 AGeV. For a quantitative
understanding of the measured data it is necessary to extract the absolute
abundancies of particle species emitted from the collision zone and
to perform event-by-event track identification. In the HADES analysis
package HYDRA the particle identification (PID) software assigns particle
species to tracks reconstructed from various detector signals. The
HADES PID ansatz is based on Probability Density Functions (PDFs)
and Bayes’ theorem. This ansatz requires measurements and simulations
of particle properties and detector response and a statistical analysis of
correlations among particle signatures. The method and first results from
the PID analysis of data taken in C+C collisions are presented.
∗ supported by BMBF (06MT190) and GSI (TM-FR1, TM-KR1).
HK 18.2 Tue 15:45 C
Prototype of a Dedicated Multi-Node Data Processing
System for Realtime Trigger and Analysis Applications —
•Daniel Kirschner, Marco Destefanis, Roukaia Djeridi,
Ingo Fröhlich, Wolfgang Kühn, Jörg Lehnert, Tiago Perez,
and Alberica Toia for the HADES collaboration — II. Phys. Inst.
Giessen, Heinrich-Buff-Ring 16, 35392 Giessen
Modern experiments in hadron physics like the HADES detector at
GSI-Darmstadt produce a large amount of data that has to be distributed,
stored and analyzed. Analysis of this data is very time consuming
due to the large amount of data and the complex algorithms needed.
This problem can be addressed by a dedicated multi-node and multi-CPU
computing architecture interconnected by Gigabit-Ethernet. Dedicated
hardware has the advantages over “Grid-Computers” in skaleability, price
per computational unit, predictability of time behavior (possibility of real
time applications) and ease of administration. Gigabit-Ethernet provides
an efficient and standardized infrastructure for data distribution. This
infrastructure can be used to distribute data in an experiment as well
as to distribute data in a multi-node computing environment. The prototype
VME-Bus card has of two major units: a network unit featuring
two Gigabit Ethernet over Copper connections and a computational part
featuring a TigerSHARC Digital Signal Processor. The discussion will
concentrate the real-life performance of Gigabit Ethernet as the main
topic. Supported by bmbf and GSI.
HK 18.3 Tue 16:00 C
Performance of the Trigger System of the HADES Detector
in C+C reactions at 1-2 AGeV — •Jörg Lehnert 1 , Alberica
Toia 1 , Roukaia Djeridi 1 , Ingo Fröhlich 1 , Wolfgang Koenig 2 ,
Wolfgang Kühn 1 , Tiago Perez 1 , James Ritman 1 , Daniel
Schäfer 1 , and Michael Traxler 2 for the HADES collaboration
— 1 II. Physikalisches Institut Univ. Gießen — 2 Gesellschaft für
Schwerionenforschung Darmstadt
The HADES detector at GSI Darmstadt investigates the dilepton production
in hadron and heavy ion induced reactions up to 2 AGeV. The
second level trigger system (LVL2) is designed to reduce the event rate
by selecting lepton pairs within a given invariant mass window. The
hardware-based LVL2 consists of Image Processing Units (IPU) which
perform pattern recognition to detect lepton signatures in different subdetectors
and a Matching Unit (MU) which combines the position and
momentum information of these signatures into tracks to select events
with lepton pairs of given invariant mass.
Since the recognition of Cherenkov rings is the most selective algorithm
of the trigger, its behavior has been studied with the help of simulations
and by comparing it to the offline analysis algorithm. This allowed to
study and optimize the performance of the second level trigger and to
improve the analysis of the dilepton content of the analyzed C+C reaction
at 1-2 AGeV in terms of efficiency and purity of the signal. Results
collected during the experiment runs in November 2001 and November
2002 are presented.
HK 18.4 Tue 16:15 C
New VHDL design for the HADES TOF Trigger Unit — •T.
Pérez for the HADES collaboration — II. Physikalisches Institut, Universität
Gießen
The HADES spectrometer is intended to investigate the dilepton production
especially from vector meson decays. The low branching ratios
of vector mesons into dileptons, in the order of 10 −5 . To reach the necesary
amount of statistics it is necessary the use high reaction rates up to
10 5 central heavy ion reactions per second. In order to reduce such an
amount of data a very sofisticated online trigger system is used. With a
combination of trigger several modules for distribution (CTU and DTU)
and detector specific processing (IPUs), maximun speed the goal. That
lead us to upgrade our Detector specific Trigger Units to newer, more
flexible and faster design. And, finaly to adopt VHDL,the standard high
level description language in electronics, as a tool to reach that goal.
HK 18.5 Tue 16:30 C
High Level Trigger Identification of High Energy Jets in ALICE
— •Constantin Loizides for the ALICE collaboration — August-
Euler-Str. 6, 60487 Frankfurt
One interesting observable at ALICE will be the measurement of the
inclusive jet cross section at 100 to 200 GeV transversal jet energy and
its fragmentation function; both to be compared to pp. The window
of about 100 to 200 GeV transversal jet energy is compatible with the
expected pt resolution of the inner tracking complex (ITS+TPC+TRD)
and the energy of the leading parton, but requires an HLT online processing
of TPC data at a rate of 200 Hz central PbPb in order to collect
sufficient statistics. The online trigger algorithm running on the HLT
system is based on charged tracking and jet recognition using a cone jet
finder algorithm,which might be improved by the additional online evaluation
of the EM calorimeter towers. The dependence of the efficiency
versus the selectivity of the trigger has been studied by simulations of pp
and PbPb interactions using PYTHIA and HIJING events. For a chosen
parameter set of the trigger algorithm the triggered events are the relevant
sample of events to be further analyzed by offline. Their resulting
jet Et distribution and the corresponding fragmentation functions might
be sensitive to different jet attenuation scenarios.
HK 18.6 Tue 16:45 C
A Fault Tolerant Data Flow Framework for Clusters
— •Timm M. Steinbeck for the Alice High Level Trigger
collaboration — Kirchhoff Institute of Physics, Ruprecht-Karls-
University Heidelberg, Im Neuenheimer Feld 227, D-69120 Heidelberg,
http://www.ti.uni-hd.de/HLT/
The ALICE experiment’s High Level Trigger (HLT) has to reduce the
data rate of up to 25 GB/s to at most 1.25 GB/s before permanent
storage. To cope with these rates a PC cluster system of several 100
nodes connected by a fast network is being designed. For the system’s
software an efficient, flexible, and fault tolerant data transport software
framework is being developed. It consists of components, connected via
a common interface, allowing to construct different configurations that
are even changeable at runtime. To ensure a fault-tolerant operation, the
framework includes fail-over mechanisms to replace whole nodes as well
as to restart and reconnect components during runtime of the system.
The last functionality utilizes the runtime reconnection feature of the
component interface. To connect components on different cluster nodes
a communication class library is used to abstract from the network used
to retain flexibility in the hardware choice. It contains two working prototype
versions for TCP and the SCI SAN. Extensions can be added
to this library without modifications to other parts of the framework.
Performance tests show very promising results, indicating that ALICE’s
requirements concerning the data transport can be fulfilled. In a test
with simulated proton-proton data for a part of the TPC an event rate
of more than 430 Hz was achieved with full tracking being performed.

Nuclear Physics Tuesday
HK 18.7 Tue 17:00 C
DCS embedded Linux front-end board — •Heinz Tilsner for the
ALICE-HLT collaboration — Kirchhoff-Institut für Physik, Universität
Heidelberg
Control and monitoring of complex detectors like the one used in AL-
ICE requires sophisticated control systems in order to supervise the overall
working conditions of these detectors like voltages, temperatures, or
gas pressures. In addition, these systems are usually used for the initialisation
and configuration of the front-end electronic which include e.g.
downloading pedestal values. They comprises of hardware and software
components acting closely together. One important requirement of these
systems are their capability to react autonomously to critical situations
in order to avoid damages to the detector. The presented autonomous
DCS single board computer represents the front-end part of the detector
control system of the TRD, TPC, and PHOS detectors of ALICE.
The device is equipped with Alteras’ Excalibur FPGA, comprising both
a 100 k gate FPGA and an embedded ARM processor on which Linux as
operating system is running. The FPGA allows to customise the device
for different front-end environments on the different detectors. Communication
with the board is based on Ethernet replacing the canonical
fieldbus which is modified in order to operate in magnetic fields. Since
the board has to operate in an environment with high radiation exposure
special care has been taken during the design process in order to
ensure radiation- and fault-tolerance. We present the architecture of the
device and results of performance measurements of the first production
prototypes.
HK 18.8 Tue 17:15 C
Grid Computing Technologies in COMPASS Data Analysis —
•F.-H. Heinsius 1 , H. Fischer 1 , R. Kuhn 2 , and L. Schmitt 2 for the
COMPASS collaboration — 1 Physikalisches Institut, Albert-Ludwigs-
Universität Freiburg — 2 Physik-Department E18, Technische Universität
München
The COMPASS experiment at CERN collects about 250TByte of raw
data per year. The production of data summary tapes at CERN requires
an equivalent of 100000Si2k computing units. It involves submission of
about 250000 batch jobs, each running 8 hours with one job finishing on
average every 2 minutes. To cope with these demands a new computing
and analysis model has been developed. In addition we started to
adapt emerging technologies in the framework of grid computing. Data
summary files are distributed through international Gigabit links to the
computer centers, where the physics analysis is performed. The Monte
Carlo production is performed at the German Grid Computing Center
(GridKa) located in Karlsruhe. In this talk the experience gained in the
physics analysis of large data sets and further plans for implementing
grid technologies will be presented.
The project is supported by BMBF.
HK 18.9 Tue 17:30 C
The BABAR Tier-A site at GridKa — •Enrico Feltresi, Andreas
Petzold, Jan Erik Sundermann, Heiko Lacker, and
Bernhard Spaan for the BABAR collaboration — Technische Universität
Dresden, Dresden, Germany
The BABAR experiment at the Stanford Linear Accelerator Center is
taking data since 1999. The high volume of data and simulated events
requires computing resources distributed among a few high perfomance
computing centers, so called Tier-A sites.The Grid Computing Center,
GridKa, at Forschungszentrum Karlsruhe serves as the German BABAR
Tier-A site since november 2002. It offers computing resources for physics
analysis, simulation production and for data preselection (skimming),
which will dominate the BABAR activities at GridKa in 2004. Beyond
that, GridKa will be the future German Grid competence center for
BABAR and other experiments, e.g. the LHC experiments. Currently,
we evaluate several Grid middleware tools for a distributed BABAR com-
puting framework, focusing on the LHC Computing Grid Project (LCG)
and on the ALIce ENvironment (AliEn).The BABAR computing environment
and corresponding grid efforts related to GridKa will be discussed.
HK 18.10 Tue 17:45 C
Digital signal processing for the European gamma-ray tracking
array AGATA ∗ — S. Dudeck 1 , •Th. Kröll 1 , R. Krücken 1 , M.
Böhmer 1 , R. Gernhäuser 1 , D. Bazzacco 2 , R. Isocrate 2 , and R.
Venturelli 2 — 1 Physik-Department E12, TU München, Germany —
2 INFN, Sezione di Padova, Italy
AGATA, the future European gamma-ray tracking spettrometer for
nuclear structure studies, has many technical challenges. Compared to
existing arrays, developments are needed concerning higher rates, better
resolution, and improved position sensitivity. These goals will be
achieved by digital processing of the signals from highly segmented HPGe
detectors. Algorithms for energy determination and trigger generation
have been developed already [1], however they have to be extended in
order to meet the requirements for AGATA: 14 bit resolution, 100 MSample/s,
and 50 kHz event rate. In our work, these algorithms have been
coded and tested in C++ and VHDL. The actual hardware implementation
has been done on a VME-board equipped with a Virtex-II FPGA.
The tests have been performed with signals obtained from the 25-fold
segmented MARS prototype detector [2]. The status of the work and
preliminary results will be presented.
[1] W. Gast et al., IEEE Trans. Nucl. Sci, 48, 2380 (2001).
[2] Th. Kröll et al., FNS2002, AIP Conf. Proc. 656, 357 (2003).
∗ supported by Maier-Leibnitz-Laboratorium, TU and LMU München
HK 18.11 Tue 18:00 C
Performance of the Charge Sensitive VA32TA2 Frontend Chip
— •V. Leontyev for the ANKE collaboration — Institut für Kernphysik,
Forschungszentrum Jülich, Germany
For the Silicon Spectator Tracker of the ANKE spectrometer at COSY
Jülich an improved version of the preamplifier chip VA2TA2 has been developed
by the Norwegian company ideas. This charge sensitive preamplifier
chip provides 32 input channels with a dynamic range either from 0
to 500 fC or 0 to −500 fC. At ANKE the chip has to handle signals from
double sided structered 69µm, 300µm silicon as well as 5.1 mm thick
Si(Li) detectors. With the trigger output, timing information is obtained
for each detector side. For the 5.1 mm thick Si(Li) this provides 3Dheight
information together with the two-dimensional strip-information.
The capabilities and performance of the chip will be shown on the basis
of laboratory tests and data taken during beam times in August and
November of 2003.
This work is supported by the FZJ.
HK 18.12 Tue 18:15 C
Results of a Real-Time Data Acquisition System under WindowsXP
for the TRIC Experiment ∗ — •Deepak Samuel for the
TRIC collaboration — Helmholtz Institut für Strahlen- und Kernphysik
For the Time Reversal Invariance Experiment at COSY (TRIC) in
Jülich the polarization correlation Ay,xz is to be measured to an accuracy
of 10 −7 . This requires the development of a robust, fast, reliable,
and flexible real-time operating system. WindowsXP was chosen because
of its proven productivity with Venturcom’s Real-Time Kernel for
fast interrupt handling. Interrupts are identified and executed within
about 6 µ s and a CAMAC module is read or written to within 1 µ s.
The implementation of the real-time kernel, the interrupt handling, the
synchronization with WindowsXP and the organization of the data acquisition
under Windows as well as the interplay with the ”live ”display
of the data with ORIGIN graphing software will be discussed. ∗ Work
supported by the FZ Jülich and the BMBF

Nuclear Physics Tuesday
HK 19 Nuclear Structure/Spectroscopy III
Time: Tuesday 15:30–18:30 Room: D
Group Report HK 19.1 Tue 15:30 D
Fine Structure of the Isoscalar Giant Quadrupole Resonance
High-Resolution Inelastic Proton Scattering Experiments ∗ —
•A. Shevchenko 1 , J. Carter 2 , R.W. Fearick 3 , S.V. Förtsch 4 ,
Y. Fujita 5 , D. Lacroix 6 , J.J. Lawrie 4 , Y. Kalmykov 1 , P. von
Neumann-Cosel 1 , V.Yu. Ponomarev 1 , A. Richter 1 , F.D. Smit 4 ,
and J. Wambach 1 — 1 Institut für Kernphysik, Technische Universität
Darmstadt, Germany — 2 School of Physics, University of the Witwatersrand,
Johannesburg, South Africa — 3 Physics Department, University
of Cape Town, South Africa — 4 iThemba LABS, Somerset West, South
Africa — 5 Physics Department, University of Osaka, Japan — 6 LPC
Caen, France
Fine structure of giant resonances carries important information on the
coherent motion of nucleons in collective modes of excitations and on the
role of different damping mechanisms of giant resonances. A systematic
study of the fine structure of giant resonances for the example of the IS-
GQR was carried out using high-resolution inelastic proton scattering at
iThemba LABS on a variety of closed-shell and deformed nuclei. The fine
structure is established as a global phenomenon. Novel wavelet analysis
methods have been developed for the extraction of characteristic energy
scales of the fluctuations in the fine structure. New experimental results
will be presented together with an interpretation of their physical nature
based on various microscopic approaches including the coupling to complex
configurations.
∗ Supported by DFG, contracts SFB 634 and 445 SUA-113/6/0-1, and by
the South African FRD.
Group Report HK 19.2 Tue 16:00 D
Dipole strength distributions in neutron-rich nuclei —
•Nadezhda Tsoneva and Horst Lenske — Institut für Theoretische
Physik, Universität Giessen, 35392 Giessen, Germany
Dipole excitations below the neutron threshold in neutron-rich nuclei
are studied microscopically by a method combining self-consistent
mean-field results from Hartree-Fock-Bogoliubov (HFB) theory and the
Quasiparticle-Phonon Model (QPM). Including up to three-phonon components
in the model configuration space, a realistic description of nuclear
spectra and their fragmentation pattern up to the particle threshold is
obtained. Of special interest are the low-lying two-phonon 1 − states and
the Pygmy Dipole Resonance (PDR). The evolution of the PDR strength
in relation to the neutron skin thickness is investigated over the Z=50 isotopic
and N=82 isotonic chains. For Sn isotopes a close correlation of the
PDR excitation energy and transition strength with the neutron excess
was found. The PDR strength increases with the neutron number while
the centroid energy decreases. By comparison to the radii of HFB ground
state densities a correlation with the size of the neutron skin could be
identified. Hence, the PDR strength establishes a clear signature for the
neutron skin size. The good agreement of our results with experiments
confirms the success of such a microscopically inspired description. For
the N=81 isotope 137 Ba with one neutron-hole in the closed N=82 shell
the distribution of the low-lying dipole strength is studied microscopically
within the framework of the QPM including quasiparticle+two-phonon
coupling. The results are compared with recent experimental data from
Darmstadt and Stuttgart. Work supported by DFG.
HK 19.3 Tue 16:30 D
New Insights into the Nuclear Structure of 42,44,46 Ca from g
Factor and B(E2) measurements of 2 + 1 States + — •S. Schielke 1 ,
K.-H. Speidel 1 , O. Kenn 1 , J. Leske 1 , D. Hohn 1 , H. Hodde 1 , J.
Gerber 2 , P. Maier-Komor 3 , O. Zell 4 , Y.Y. Sharon 5 , and L.
Zamick 5 — 1 Helmholtz-Institut für Strahlen- und Kernphysik, Univ.
Bonn — 2 Institut de Recherches Subatomiques, Strasbourg, France —
3 Physik-Dept. TU München — 4 Institut für Kernphysik, Univ. Köln —
5 Department of Physics and Astronomy, Rutgers Univ., USA
The low-level structure of calcium isotopes is generally characterized
by the valence neutrons in the fp shell and a 40 Ca core. The gradual
filling of the f7/2 shell with neutrons for 42,44,46 Ca, between doubly-magic
40 Ca and 48 Ca, causes strong variations in the excitation energies and
B(E2)’s of their 2 + 1 states. If fp shell neutrons are the dominant components
in the nuclear wave functions one expects for these states negative g
factor values (g ≃ −0.4). From recent g factor measurements, employing
projectile Coulomb excitation and the transient field technique, however,
very surprising results were obtained. For 42,44 Ca(2 + 1 ) positive values of
g factors were observed which could only be explained by shell model calculations
including substantial cross-shell configurations from 40 Ca core
excitation [1]. In contrast, a recent first measurement on 46 Ca(2 + 1 ), using
an enriched 46 Ca beam, however, yielded a negative g factor, in complete
disagreement with the positive value prediction. Evidently, in this case
the valence neutrons of the fp shell play the dominant role.
+ supported by the DFG under Sp 190/9-2
[1] S. Schielke et al., Phys. Lett. B 571(2002)29
HK 19.4 Tue 16:45 D
Fragmentation of the E1 two-phonon strengths in odd-mass nuclei
near the N=82 shell closure — •M. Scheck 1 , H. von Garrel
1 , P. von Brentano 2 , C. Fransen 2 , G. Friessner 2 , N. Hollmann
2 , J. Jolie 2 , U. Kneissl 1 , C. Kohstall 1 , A. Linnemann 2 , D.
Mücher 2 , N. Pietralla 2 , H.H. Pitz 1 , F. Stedile 1 , C. Stoyanov 3 ,
N. Tsoneva 3,4 , S. Walter 1 , and V. Werner 2 — 1 Inst. für Strahlenphysik,
Universität Stuttgart — 2 Inst. für Kernphysik, Universität zu
Köln — 3 INRNE, Sofia — 4 Inst. für Theor. Physik, Universität Giessen
Quadrupole-octupole coupled two-phonon E1 excitations (2 + ⊗3 − ) represent
the dominant low-lying E1 excitations in spherical even-even nuclei
near shell closures [1]. In the present studies the fragmentation of the
dipole strength in odd-mass nuclei near the N=82 shell closure was investigated.
The recent photon scattering experiments on 135,137 Ba, 139 La,
and 141 Pr extend systematically our previous measurements on 143 Nd [2].
All experiments were performed at the photon scattering facility of the
4.3 MV Stuttgart Dynamitron using bremsstrahlung beams of 4 MeV
end point energy. The fragmentation and partially observed reduction of
the dipole strengths as compared to those in the neighboring even-even
N=82 isotones [3] arediscussed and compared with our similar results for
nuclei near the Z=50 shell closure (see [4]).
[1] W. Andrejtscheff et al., Phys. Lett. B 506, 239 (2001).
[2] A. Zilges et al., Phys. Rev. Lett. 70, 2880 (1993).
[3] R.-D. Herzberg et al., Nucl. Phys. A 592, 211 (1995).
[4] J. Bryssinck et al., Phys. Rev. C 65, 024313 (2002).
Supported by DFG under contracts Kn 154/31 and Pi 393/1-2
HK 19.5 Tue 17:00 D
E1 strength distribution in N=82 nuclei ∗ — •S. Volz, M. Babilon,
W. Bayer, D. Galaviz, T. Hartmann, A. Kretschmer,
K. Lindenberg, S. Müller, D. Savran, K. Sonnabend, K. Vogt,
and A. Zilges — Institut für Kernphysik, Technische Universität Darmstadt,
Germany
Recently much effort in theory and experiment has been spent to get
a deeper insight into low lying electric dipole excitations between about
5 and 10 MeV. This strength is usually denoted as Pygmy Dipole Resonance.
A well suited experimental technique to determine the electric
dipole strength distribution is Nuclear Resonance Fluorescence (NRF)
[1]. With this method it was possible to determine the absolute transition
strengths of excitations in the N=82 isotones 138 Ba, 140 Ce, and
144 Sm [2]. In a recent experiment at the injector of the S-DALINAC at
TU Darmstadt the nucleus 142 Nd has been measured and it is now possible
to discuss a systematic trend of the mode. In addition calculations
in the Quasi Particle Phonon Model will be presented [3,4].
∗ supported by the DFG (SFB 634 and Zi510/2-2)
[1] U. Kneissl et al., Prog. Part. Nucl. Phys. 37, 349 (1996)
[2] A. Zilges et al., Phys. Lett. B 542, 43 (2002)
[3] V.Yu. Ponomarev, private communication
[4] N. Tsoneva, private communication
HK 19.6 Tue 17:15 D
Spectral Statistics of the Fine Structure of the Electric Pygmy
Dipole Resonance in N = 82 Nuclei ∗ — •A. Heine 1 , J. Enders
1 , T. Guhr 2 , P. von Neumann-Cosel 1 , V.Yu. Ponomarev 1 ,
A. Richter 1 , S. Volz 1 , and J. Wambach 1 — 1 Institut für Kernphysik,
Technische Universität Darmstadt, 64289 Darmstadt, Germany
— 2 Matematisk Fysik, LTH, Lunds Universitet, SE-22100 Lund, Sweden
We present the first statistical analysis of the fine structure of the
electric pygmy dipole resonance. To this extent we analyzed a data
set composed of 184 E1 transitions (levels and strengths) measured in
the semimagic N = 82 isotones 138 Ba, 140 Ce, 142 Nd, and 144 Sm [1]. Mi-

Nuclear Physics Tuesday
croscopic calculations performed within the quasiparticle-phonon model
(QPM) serve to understand the experimental findings. By taking the effects
of the incompleteness of the experimental data into account, qualitative
agreement between experiment and QPM can obtained for the
level as well as the intensity statistics. [1] A. Zilges et al., Phys. Lett. B
542 (2002) 43.
∗ Supported by DFG under contract SFB 634.
HK 19.7 Tue 17:30 D
Dipole- and quadrupole strength in 45 Sc ∗ — •D. Savran 1 ,
M. Babilon 1,2 , W. Bayer 1 , D. Galaviz 1 , T. Hartmann 1 , A.
Kretschmer 1 , K. Lindenberg 1 , S. Müller 1 , K. Sonnabend 1 ,
K. Vogt 1 , S. Volz 1 , and A. Zilges 1 — 1 Institut für Kernphysik,
Technische Universität Darmstadt, Schlossgartenstrasse 9,D-64289
Darmstadt, Germany — 2 A. W. Wright Structure Laboratory, Yale
University, New Haven, CT, USA
Strong variations of the dipole excitation strengths have been observed
in even-even nuclei of the A=30-50 mass region. We performed a Nuclear
Resonance Fluorescence Experiment using bremsstrahlung at the
Darmstadt S-DALINAC accelerator to measure dipole- and quadrupole
strengths in the Z=21 nucleus 45 Sc up to 7 MeV. The energy and strength
of 34 states have been observed for the first time. The results will be compared
to neighbouring nuclei.
* supported by the DFG (SFB 634 and Zi 510/2-2)
HK 19.8 Tue 17:45 D
Low lying dipole strength in nuclei around the Z = 20-shell closure
— •T. Hartmann 1 , M. Babilon 1,2 , W. Bayer 1 , D. Galaviz 1 ,
S. Kamerdhziev 3 , A. Kretschmer 1 , K. Lindenberg 1 , E. Litvinova
3 , S. Müller 1 , D. Savran 1 , K. Sonnabend 1 , K. Vogt 1 , S.
Volz 1 , and A. Zilges 1 — 1 Institut für Kernphysik, Technische Universität
Darmstadt, Germany — 2 Physics Department - Wright Nuclear
Structure Laboratory, Yale University, New Haven, CT, USA —
3 Institute of Physics and Power Engineering, Obninsk, Russia
Photon-scattering experiments have been performed on the semi-magic
nucleus 44 Ca to investigate the low-lying electric dipole strength below
10 MeV. Earlier experiments on the two doubly-magic nuclei 40,48 Ca had
shown a significant difference in their E1-strength which exhaust 0.02%
and 0.33% of the isovector EWSR, respectively [1]. The E1-strength in
44 Ca is more fragmented. About 0.39% of the EWSR is exhausted below
10 MeV. Theoretical predictions within the Extended Theory of Finite
Fermi Systems (ETFFS) describe the general trend and the fragmentation
of the strength in the three Calcium isotopes quite well, the absolute
strength is reproduced within a factor of 2.
∗ supported by the DFG (SFB 634 and Zi510/2-2)
[1] T. Hartmann et al., Phys. Rev. C65 (2002) 034301.
HK 20 Theory III
HK 19.9 Tue 18:00 D
Photon scattering from 92 Mo, 98 Mo and 100 Mo up to the
neutron-separation energy — •G. Rusev 1 , R. Schwengner 1 ,
A. Wagner 1 , K.D. Schilling 1 , M. Erhard 1 , F. Dönau 1 , A.R.
Junghans 1 , K. Kosev 1 , and E. Grosse 1,2 — 1 Institut für Kern- und
Hadronenphysik, Forschungszentrum Rossendorf, Dresden, Germany —
2 Technische Universität Dresden, Dresden, Germany
We present the results of photon-scattering experiments on the nuclei
92 Mo, 98 Mo and 100 Mo up to the neutron-separation energy. The
experiments were carried out at the new bremsstrahlung facility of the
Rossendorf ELBE accelerator at electron energies of 9 and 12.6 MeV.
Samples of about 3 g of highly enriched 92 Mo, 98 Mo and 100 Mo, respectively,
were used in the nuclear-resonance-fluorescence experiments.
Scattered photons were measured with four escape-suppressed HPGe detectors
placed two by two at 90 ◦ and 127 ◦ , respectively, relative to the
incident photon beam.
The dependence of the observed dipole-strength distributions on the neutron
number of the Mo isotopes is discussed. The experimental results
are compared with predictions of RPA calculations.
⋆ Supported by the DFG under contracts Do 466/1-1 and Do 466/1-2.
HK 19.10 Tue 18:15 D
Low-Spin γ-Ray Spectroscopy of the Doubly-Magic Nucleus
56 Ni with the MINIBALL-Spectrometer — C. Fransen 1 , N.
Pietralla 1,2 , •D. Mücher 1 , J. Eberth 1 , N. Warr 1 , and D. Weisshaar
1 for the MINIBALL collaboration — 1 Institut für Kernphysik,
Universität zu Köln — 2Dept. of Physics, SUNY, Stony Brook, USA
The doubly closed-shell N=Z nucleus 56
28Ni is of particular interest for
understanding nuclear structure in the fp-shell. In recent years large-scale
shell model calculations for this region became possible. The microscopic
description of the excitation of 56Ni remained one of the biggest challenges
for theory. While deformed high-spin structures of 56Ni are well investigated
[1], information on low-spin states was sparse. We investigated 56Ni with the reaction 54Fe( 3He,nγ) 56Ni at the Cologne FN-Tandem accelerator
with the highly efficient Miniball-spectrometer. γγ-coincidence
data were measured for excited states up to an excitation energy of about
9 MeV. The known γ-decay scheme for low-spin states has been more than
doubled and several branching ratios were determined. The set-up and
data will be presented. The spectrometer performance will be discussed.
The data will be compared to the newest large-scale Monte-Carlo shell
model calculations by the Tokyo group using the GXPF1 interaction [2].
Supported by the Emmy Noether-Program of the DFG under Pi393/1-2 and
by BMBF under 06OK958
[1] D. Rudolph et al.,Phys.Rev.Lett. 82, 3763 (1999)
[2] M. Honma, T. Otsuka et al., priv. comm., submitted for publication
Time: Tuesday 15:30–18:30 Room: E
Group Report HK 20.1 Tue 15:30 E
Rho-Omega Mixing in Matter — •Felix Riek and Jörn Knoll —
Gesellschaft für Schwerionenforschung, Planckstr. 1, 64291 Darmstadt
The in-medium properties of the light vector mesons in nuclear matter
are studied within a self-consistent coupled Dyson scheme. For the
nuclear matter part the nucleon, the ∆-isobar and the pion degrees of
freedom are explicitly included. Besides the normal couplings short range
repulsive correlations of Migdal type are added in order to arrive at a realistic
description of the in-medium spectral properties of the pion. All
spectral functions are calculated self-consistently as a function of energy
and spatial momentum in the density and temperature range till twice
ρ0 and T ≤ 120 MeV. The properties of the vector mesons are modified
through their interaction with the virtual pion cloud by means of the ππρand
πρω-couplings. With increasing density in particular the space-like
parts of the pion spectral function provide a strong mixing between the
two vector mesons. This leads to a strong increase the damping with of
the ω-meson with increasing density and temperature. Consequences for
the in-medium part of di-lepton yields from the electromagnetic decay of
both vector mesons are discussed.
Group Report HK 20.2 Tue 16:00 E
Linking the Quark Meson Model with QCD at High Temperature
— •Jens Braun 1 , Kai Schwenzer 2 , and Hans-Jürgen
Pirner 1 — 1 Institut für Theoretische Physik, Universität Heidelberg,
Philosophenweg 19, 69120 Heidelberg. — 2 Department of Physics, North
Carolina State University, 2700 Stinson Drive, Raleigh, NC 27695, USA.
The equation of state of QCD in extreme conditions of high temperature
and high baryon density is at the focus of interest in heavy ion
collisions and astrophysics.
We model the transition of a system of quarks and gluons at high energies
to a system of quarks and mesons at low energies in a consistent
renormalization group approach. Flow equations interpolate between the
physics of the high temperature degrees of freedom and the low temperature
dynamics at a scale of 1 GeV. We discuss the dependence of the
equation of state on baryon density and compare our results with recent
lattice gauge simulations.
HK 20.3 Tue 16:30 E
Renormalization Group Flow Equations for the Linear sigma-
Model at Finite Volume and Finite Quark Mass — •Bertram
Klein, Jens Braun, Lars Jendges, and Hans-Jürgen Pirner —
Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg
19, 69120 Heidelberg.

Nuclear Physics Tuesday
The linear sigma-model with quarks provides a valid description of
QCD on a scale below approximately 1.3 GeV. It is well suited to describe
the physics of the chiral symmetric phase at the UV scale, as well
as he physics at low energies characterized by chiral symmetry breaking.
Starting with the theory given at the UV scale, in the renormalization
group approach infinitesimal shells of large momentum modes are
integrated out and the couplings of the theory are renormalized. In this
way, an effective low energy theory is obtained by evolving the couplings
towards small momentum scales.
In order to enable a comparison with results from lattice QCD, we
consider a renormalization group treatment of the linear sigma model in
a finite Euclidean volume. The renormalization group flow equations are
derived and solved numerically. Explicit breaking of the chiral symmetry
is considered through the introduction of a finite quark mass.
We obtain results for the volume dependence of the chiral condensate.
In accordance with the results obtained from finite volume partition
functions, the mesonic zero modes are important for the evolution
of the couplings at low renormalization scales.
HK 20.4 Tue 16:45 E
RG analysis of the quark-meson model at finite temperature
and density — •Bernd-Jochen Schaefer and Jochen Wambach
— IKP, Schlossgartenstrasse 9,D-64289 Darmstadt
Renormalization group equations obtained by means of a proper-time
regulator are used in order to analyze the chiral symmetry restoration
at finite temperature and density in the two flavor quark-meson model.
Results for the Nf = 2 QCD phase diagram are presented and compared
with those coming from lattice simulations.
HK 20.5 Tue 17:00 E
Properties of two- and three-quark states in hot and dense matter
— •S. Mattiello 1 , M. Beyer 1 , S. Strauss 1 , T. Frederico 2 ,
and H.J. Weber 3 — 1 FB Physik, U Rostock, Germany — 2 CTA, Sao
Jose dos Campos, Brazil — 3 U of Virginia, Charlottesville, USA
In the framework of the light front field theory at finite temperature
and density we investigate the formation of two- and three-body bound
states in quark matter. This approach leads to the dominant medium
effects, i.e. the Pauli blocking and the self energy corrections. Utilizing
the Nambu-Jona-Lasinio model on the light front we study the chiral
restauration and the dependence of pionic properties (mass and decay
costante) on the temperature and the chemical potential. The threequark
dynamics is investigated using a scalar zero-range interaction and
the results for the dependence on the medium of the three-body mass
are presented. The dissociation of the three-quark state as well as the
critical temperature of the color-superconducting phase are investigated.
Acknowledgement: Work supported by Deutsche Forschungsgemeinschaft.
HK 20.6 Tue 17:15 E
Quasiparticle Description of Hot QCD at Finite Quark Chemical
Potential (∗) — •Michael Thaler 1 , Roland Schneider 1,2 , and
Wolfram Weise 1,2 — 1 Physik Department Technische Universität
München — 2 ECT ∗ , Villa Tambosi, Trento, Italy
We study the extension of a phenomenologically successful quasiparticle
model that describes lattice results of the equation of state of the
deconfined phase of QCD for Tc ≤ T ∼ < 4Tc, to finite quark chemical
potential µ. The phase boundary line Tc(µ), the pressure difference
∆p(T, µ) = (p(T, µ) − p(T, µ = 0))/T 4 and the quark number density
nq(T, µ)/T 3 are calculated and compared to recent lattice results. Good
agreement is found up to quark chemical potentials of order µ ∼ Tc. (∗)
Work supported in part by BMBF and GSI.
HK 20.7 Tue 17:30 E
The effect of quark off-shellness in high energy processes —
•Olena Linnyk, Stefan Leupold, and Ulrich Mosel — Institut
für Theoretische Physik, Universität Giessen, 35392 Giessen, Germany
We study the quark and gluon structure of hadrons going beyond the
well-known picture of collinear non-interacting partons. Calculated are
the effects of an initial quark off-shellness in several high energy processes.
The interaction of the partons missed in the standard perturbative consideration
is taken into account in the spectral functions of the quarks,
and using a generalized factorization. The intrinsic motion of the partons
is consistently treated as well. The quark off-shellness turns out to
be important in the description of semi-exclusive observables such as the
triple differential Drell-Yan cross section. Recent data of the Fermilab
experiment E866 on continuum dimuon production are analyzed and the
width of the quark spectral function in the proton is found to be approximately
150 MeV. The dependence of the width on the hard scale is
investigated. The results of our calculations reveal the important role of
the initial quark virtuality in high energy processes.
Work supported by the European graduate school Giessen–Copenhagen.
HK 20.8 Tue 17:45 E
Stable gapless color superconducting phases of dense quark
matter — •Igor Shovkovy — Institute for Theoretical Physics, Johann
Wolfgang Goethe University, 60325 Frankfurt am Main
I review the zero and finite temperature properties of the recently proposed
gapless color superconducting phase of neutral dense quark matter
in β-equilibrium. This is a stable phase of quark matter that could exist
inside cores of compact stars.
HK 20.9 Tue 18:00 E
ρ −ω splitting and mixing in nuclear matter — •Sven Zschocke
and Burkhard Kämpfer — Forschungszentrum Rossendorf e.V., Institut
für Kern- und Hadronenphysik, D-01314 Dresden,Postfach 51 01
19
We investigate mass splitting and mixing effect of ρ and ω mesons
in nuclear matter within the QCD sum rule approach in zero-width approximation.
In matter, ρ and ω differ only by a scalar flavour mixed
condensate and a twist-4 four-quark condensate as long as one is restricted
to dimension-6 operators. In our sum rule analysis we have
taken into account both condensates and investigate the impact of the
poorly known four-quark condensate. Both effects, mixing and splitting,
are much stronger in a nuclear medium than in vacuum. This triggers
the hope to verify this in-medium effects with experiments like HADES
at GSI.
HK 20.10 Tue 18:15 E
Suppression of high transverse momentum particles at RHIC by
(pre–)hadronic FSI — •Kai Gallmeister, Wolfgang Cassing,
and Carsten Greiner* — Institut für Theoretische Physik, Universität
Giessen, 35392 Giessen, Germany (*present address: Institut für
Theoretische Physik, Universität Frankfurt, 60054 Frankfurt am Main,
Germany)
We investigate transverse hadron spectra from proton+proton,
deuteron+Au and Au+Au collisions at √ s = 200 GeV within the
Hadron–String–Dynamics (HSD) approach which is based on quark, diquark,
string and hadronic degrees of freedom, combined with Pythia
calculations for high p⊥ spectra. The comparison to experimental data
from RHIC shows that pre–hadronic effects of the leading hadrons can
be responsible for both the hardening of the spectra for low transverse
momenta as well as the suppression of high p⊥ hadrons. The interactions
of formed, non–leading hadrons are found to be more or less negligible
for p⊥ ≥ 8 GeV/c and cannot be responsible for the large suppression
seen experimentally, but they have some importance for lower p⊥ values.
These findings are in nice agreement with the hadron attenuation
observed in virtual photon induced reactions on nuclei at HERMES, cf.
Thomas Falter’s talk.
Work supported by BMBF.

Nuclear Physics Tuesday
HK 21 Heavy Ions II
Time: Tuesday 15:30–18:30 Room: F
Group Report HK 21.1 Tue 15:30 F
Do we see an onset of deconfinement at SPS energies ? — •D.
Flierl 1 , C. Alt 1 , C. Blume 1 , P. Buncic 1 , P. Dinkelaker 1 , V.
Friese 2,3 , M. Gazdzicki 1 , M. Kliemant 1 , S. Kniege 1 , I. Kraus 2 ,
B. Lungwitz 1 , C. Meurer 1 , M. Mitrovski 1 , S. Radomski 2 , R.
Renfordt 1 , A. Richard 1 , A. Sandoval 2 , R. Stock 1 , and H.
Ströbele 1 for the NA49 collaboration — 1 Institut für Kernphysik,
Universität Frankfurt — 2 Gesellschaft für Schwerionenforschung (GSI),
Darmstadt — 3 Fachbereich Physik der Universität, Marburg
In the course of the energy scan programme at the CERN SPS the
NA49 experiment has measured the hadronic final state of Pb+Pb collisions
at 20,30,40,80 and 160 AGeV beam energy.
Several observables indicate the onset of a phase transition at lower SPS
energies. For example, the K + to π + ratio - which is closely related to the
strangeness over entropy ratio - shows in Pb+Pb collisions a maximum
at 20-30 AGeV. In statistical model calculations, such a dependence is
characteristic for the creation of a plasma phase. We will summarize
the excitation functions of pion multiplicity, K + to π + ratio, average
transverse momentum, and event by event fluctuations.
HK 21.2 Tue 16:00 F
Event-by-event fluctuations of the mean transverse momentum
at SPS energy — •Hiro Sako and Harald Appelshäuser for the
CERES collaboration — GSI Darmstadt, Germany
The study of event-by-event fluctuations of the mean transverse momentum
MpT in ultra-relativistic nuclear collisions may provide evidence
for the existence of the QCD phase transition. Significant non-statistical
fluctuations at 40, 80, and 158 AGeV/c have been observed recently by
the CERES collaboration (Nucl. Phys. A 727 (2003) 97). A systematic
investigation of the beam energy dependence in the SPS and RHIC
energy range does, however, not reveal the desired signature for the existence
of a critical point in the QCD phase diagram. New results from
a study of minimum bias Pb-Au collisions at 158 AGeV indicate an excess
of non-statistical MpT fluctuations in semi-peripheral events over a
simple extrapolation from pp. Similar observations have recently been
reported at RHIC.
HK 21.3 Tue 16:15 F
Two-particle correlations in Pb+Au collisions at 158 AGeV —
•Dariusz Antończyk for the CERES collaboration — Gesellschaft für
Schwerionenforschung mbH, Darmstadt, Germany
CERES is a dilepton spectrometer at CERN SPS. After the upgrade,
which improved the momentum resolution and extended the detector
capabilities to hadrons, CERES collected 30 million Pb+Au events at
158 AGeV in the year 2000. A Hanbury-Brown-Twiss (HBT) analysis of
pion pairs in a subset of these data, together with the results obtained at
other beam energies, lead to a new freeze-out criterion (PRL 90 (2003)
022301). After the full calibration of the 30 million events was completed
the dependence of the HBT correlation radii on the orientation of
the reaction plane, the non-identical particle Coulomb correlations, and
the strangeness production are under study. The current status of this
analysis will be presented.
HK 21.4 Tue 16:30 F
First Results from NA60 on Low-Mass Muon Pair Production
in In-In Collisions at 158 AGeV — •Sanja Damjanović for the
NA60 collaboration — Physikalisches Institut der Universität Heidelberg
The new NA60 experiment at the CERN SPS studies the production of
muon pairs in nucleus-nucleus and proton-nucleus collisions. It combines
the muon spectrometer and zero degree calorimeter previously used in
NA50 with a novel 12-plane silicon pixel telescope within a 2.5 T dipole
magnet in the target region, resulting in strong improvements of the
invariant mass resolution and in the pair acceptance down to zero transverse
momenta. The main physics goals refer to low-mass pairs including
the vector mesons ω and φ, intermediate-mass pairs separated according
to open charm and prompt thermal production, and high-mass pairs including
anomalous charmonium suppression. During the first production
beam time over 6 weeks with an Indium beam on a segmented In target
in late 2003, about 250 million dimuon triggers were recorded. The total
physics sample in the low-mass region is estimated to be about 1.5 million
pairs after track matching to the pixel telescope. We report on first
results from a subsample of the total.
HK 21.5 Tue 16:45 F
System size dependence of strange hadron production at the
SPS ∗ — •P. Dinkelaker 1 , C. Alt 1 , C. Blume 1 , P. Buncic 1 , D.
Flierl 1 , V. Friese 2,3 , M. Gazdzicki 1 , M. Kliemant 1 , S. Kniege 1 ,
I. Kraus 2 , B. Lungwitz 1 , C. Meurer 1 , M. Mitrovski 1 , C. Hoehne
3 , S. Radomski 2 , R. Renfordt 1 , A. Richard 1 , A. Sandoval 2 , R.
Stock 1 und H. Ströbele 1 für die NA49-Kollaboration — 1 Institut für
Kernphysik, Universität Frankfurt — 2 Gesellschaft für Schwerionenforschung
(GSI), Darmstadt — 3 Fachbereich Physik der Universität, Marburg
It is well known that the relative production of strange hadrons in
central Pb+Pb collisions is enhanced over elementary p+p collisions. To
study the onset of this enhancement data were taken for different nuclei
(C+C and Si+Si) and minimum bias Pb+Pb.
The NA49 collaboration presents data to clarify the system size dependence
at 40 and 158 A·GeV. New data on the dependence of kaon production
on centrality in Pb+Pb collisions at 40 A·GeV will be presented.
The result will be compared to the centrality dependence of other hadron
species at this energy and also at 158 A·GeV and the AGS energies.
The experimental results will be compared to dynamical and statistical
model approaches. The available data will help to identify the possible
onset of the observed differences and motivates a detailed energy scan
program with light nuclei as a future project at the CERN SPS.
∗ Supported by BMBF and GSI
HK 21.6 Tue 17:00 F
Λ and ¯ Λ production in central Pb+Pb collisions at SPS energies
∗ — •A. Richard 1 , C. Alt 1 , C. Blume 2 , P. Buncic 1 , P. Dinkelaker
1 , D. Flierl 1 , V. Friese 2,3 , M. Gazdzicki 1 , M. Kliemant 1 ,
S. Kniege 1 , I. Kraus 2 , B. Lungwitz 1 , C. Meurer 1 , M. Mitrovski
1 , S. Radomski 2 , R. Renfordt 1 , A. Sandoval 2 , R. Stock 1 ,
and H. Ströbele 1 for the NA49 collaboration — 1 Institut für Kernphysik,
Universität Frankfurt am Main — 2 Gesellschaft für Schwerionenforschung
(GSI), Darmstadt — 3 Fachbereich Physik der Universität,
Marburg
In the recent years the NA49 experiment has collected data at beam
energies between 20 and 158 AGeV with the objective to cover the critical
region of energy densities where the expected phase transition to a
deconfined phase might occur. One of the most striking observations is
the pronounced maximum in the K + /π + ratio. In order to investigate
whether this effect appears in other strange particles as well, the Λ/π
ratio in central lead lead collisions was analysed.
In this contribution new results at 20 and 30 A·GeV will be presented
to complete the previous data from the energy scan at SPS. Transverse
momentum and rapidity spectra will be shown. Due to the large acceptance
of the NA49 detector total yields can be derived by integrating the
rapidity spectra. The results will be compared to predictions of theoretical
models.
∗ Supported by BMBF and GSI.
HK 21.7 Tue 17:15 F
Ξ − and ¯ Ξ + production in Pb+Pb collisions at 40A·GeV at
CERN SPS — •Christine Meurer 1 , C. Alt 1 , C. Blume 1 , P. Buncic
1 , P. Dinkelaker 1 , D. Flierl 1 , V. Friese 2,3 , M. Gazdzicki 1 , M.
Kliemant 1 , S. Kniege 1 , I. Kraus 2 , B. Lungwitz 1 , S. Radomski 2 ,
R. Renfordt 1 , A. Richard 1 , A. Sandoval 2 , R. Stock 1 , and H.
Ströbele 1 for the NA49 collaboration collaboration — 1 Fachbereich
Physik der Universität, Frankfurt/M — 2 Gesellschaft für Schwerionenforschung
(GSI), Darmstadt — 3 Fachbereich Physik der Universität,
Marburg
We present new results on the Ξ − and ¯Ξ + production in central and
minimum bias Pb+Pb collisions at 40 A·GeV, measured by the large
acceptance hadron spectrometer NA49. Rapidity and transverse mass
spectra as well as an estimate for the total multiplicity of Ξ − hyperons
in central reactions are shown.
The comparison to measurements at other energies gives insight into the
excitation function of the production of multiple strange baryons in heavy
ion collisions.
The system size dependence of the Ξ − production is discussed in terms

Nuclear Physics Tuesday
of centrality selected minimum bias data at 40 A·GeV. Furthermore, we
show the ¯ Ξ + /Ξ − ratio in dependence on collision centrality and beam
energy.
Finally, our results are compared to other measurements and model predictions.
HK 21.8 Tue 17:30 F
Rapidity and transverse momentum dependence of π-π Bose-
Einstein correlations measured at 20,30,40,80 and 158 AGeV
beam energy (Stefan Kniege, Christopher Alt, Dominik Flierl)
— •S. Kniege 1 , C. Alt 1 , C. Blume 1 , P. Buncic 1 , P. Dinkelaker
1 , D. Flierl 1 , V. Friese 2,3 , M. Gazdzicki 1 , M. Kliemant 1 , I.
Kraus 2 , B. Lungwitz 1 , C. Meurer 1 , M. Mitrovski 1 , S. Radomski
2 , R. Renfordt 1 , A. Richard 1 , A. Sandoval 2 , R. Stock 1 und
H. Ströbele 1 für die NA49-Kollaboration — 1 Institut für Kernphysik,
Universität Frankfurt — 2 Gesellschaft für Schwerionenforschung (GSI),
Darmstadt — 3 Fachbereich Physik der Universität, Marburg
The space time conditions during the last stages of a heavy ion collision
define the HBT radii. Within hydrodynamic inspired models these observables
are related to crucial parameters describing the dynamics of such
a collision. The dependence of the measured radii on transverse momentum
can be related to quantities like temperature, strength of transverse
expansion and life time of the fireball.
Various measurements at the SPS energy scan programme suggest a qualitative
change in several observables at 20-30 AGeV. We will present the
rapidity as well as the kt dependence of pion HBT radii at 20 and 30
AGeV recently measured by the NA49 experiment. The new results will
be compared to measurements at 40,80 and 160 AGeV beam energy.
HK 21.9 Tue 17:45 F
Ω − and ¯ Ω + production in central Pb+Pb collisions at SPS
energies ∗ — •M. Mitrovski 1 , C. Alt 1 , C. Blume 1 , P. Buncic 1 , P.
Dinkelaker 1 , D. Flierl 1 , V. Friese 2,3 , M. Gazdzicki 1 , M. Kliemant
1 , S. Kniege 1 , I. Kraus 2 , B. Lungwitz 1 , C. Meurer 1 , S. Radomski
2 , R. Renfordt 1 , A. Richard 1 , A. Sandoval 2 , R. Stock 1
und H. Ströbele 1 für die NA49-Kollaboration — 1 Institut für Kernphysik,
Universität Frankfurt — 2 Gesellschaft für Schwerionenforschung
(GSI), Darmstadt — 3 Fachbereich Physik der Universität, Marburg
Preliminary results on Ω − and ¯ Ω + production in central Pb+Pb
collisions at 30, 40, 80, and 158 A·GeV are presented.
These measurements are performed using the large acceptance NA49
hadron spectrometer at the CERN SPS which allows for precise
determination of particle momenta and decay topologies.
Fully corrected rapidity and mT spectra in central Pb+Pb collisions at
40 and 158 A·GeV are obtained. Also total multiplicities at 40 and 158
A·GeV are estimated. The yields at mid-rapidity agree closely with the
results of WA97/NA57[1]. The ratio of ¯Ω + /Ω − is calculated for central
Pb+Pb collisions at 30, 40, 80 and 158 A·GeV. This ratio is smaller than
1 for Pb+Pb collisions. The yield measured in central Pb+Pb collisions
at 158 A·GeV is close to the expectation of a hadron gas model[2]
(grand canonical approximation) with partial strangeness saturation.
∗ Supported by BMBF and GSI.
HK 22 Plenary Session
[1] E.Andersen et al. (WA97), Phys. Lett. B449 (1999) 401.
[2] F. Becattini et al., hep-ph/0310049 (2003).
HK 21.10 Tue 18:00 F
Interpretation of the system-size dependence of strangeness
production in A+A collisions at 158 AGeV — •C. Höhne 1 , F.
Pühlhofer 1 , I. Kraus 2 , M. Gazdzicki 3 , H. Ströbele 3 , and R.
Stock 3 for the NA49 collaboration — 1 Fachbereich Physik, Universität
Marburg — 2 GSI, Darmstadt — 3 Institut für Kernphysik, Universität
Frankfurt
New data from the NA49 experiment at the CERN-SPS support the
interpretation that in central Pb+Pb collisions above 30 AGeV a partonic
phase is created in the early stage of the reaction. This conclusion
is based on the non monotonic devolution of the energy dependence of
strangeness production. Complementary information is obtained from
the system-size dependence recently measured by NA49 (p+p, C+C,
Si+Si, Pb+Pb at 158 AGeV).
The data show a steep rise of the relative strangeness production as
a function of the number of participating nucleons reaching a saturation
value at Npart ∼ 60. Qualitatively, this scenario is expected from
statistical models in which the relative strangeness content rises with
increasing volume due to vanishing constraints imposed by strict local
flavor conservation. In this work an attempt is made to understand this
phenomenon starting from a microscopic view of the reaction. Using
results from model calculations the hypothesis is formulated that coherent
partonic subsystems of increasing size are formed decaying as one
quantum-mechanical object. Hadron abundances resulting from this decay
can be described with statistical models.
HK 21.11 Tue 18:15 F
Simulation studies of the future CBM experiment at GSI † —
•Romain Holzmann for the CBM collaboration — GSI, Darmstadt
The Compressed Baryonic Matter experiment (CBM) planned at the
future GSI accelerator facility SIS200 [1] will study heavy-ion collisions
in the energy range of 10–30 AGeV, exploring the phase diagram of nuclear
matter at maximum reachable densities, yet moderate temperatures.
The prime goals of CBM are the exploration of the phase boundary
close to the predicted tricritical point, as well as the study of inmedium
properties of hadrons. To this end, CBM is designed as a highacceptance,
high-resolution and high-rate detector for charged particles.
Among the sensitive experimental signals to be measured are low-mass
vector mesons (ρ, ω and φ), open charm (D + , D − , D 0 ), hidden charm
(J/Ψ) and multi-strange baryons. Most of these are very rare probes
and will need to be acquired both at very high event rates and with very
selective triggers. Detailed feasibility studies of the detector concept
have been started and will be presented. [1] Conceptual Design Report,
http://www.gsi.de/GSI-Future/cdr/
† supported by GSI, BMBF, INTAS and EU
Time: Wednesday 08:30–10:00 Room: P
Plenary Talk HK 22.1 Wed 08:30 P
Facets of the (d, 2 He) Charge Exchange Reaction at Intermediate
Energies: from NN-studies to astrophysics to doublebeta
decay — •Dieter Frekers — Inst. f. Kernphysik, Universität
Münster
In this talk, results from the (d, 2 He) reaction at intermediate energies
are presented. The unbound di-proton system is referred to as 2 He, if the
two protons couple to a 1 S0, T=1 state. The (d, 2 He) probe appears as a
powerful spectroscopic tool for studying charge-exchange reactions in the
β + direction. The key issue here will be the high resolution of order 100
keV, which provides new and sometimes unexpected insight into nuclear
structure phenomena. This program has been launched at the AGOR
Superconducting Cyclotron Facility at the KVI Groningen. By now it
covers a wide field of physics questions ranging from few-body physics
(measurement of the neutron-neutron scattering length ann), the structure
of halo-nuclei ( 6 He, 7 He), to questions pertaining to the dynamics
of supernova explosions and nuclear synthesis (i.e. GT + distribution in
pf-shell nuclei), and more recently to the measurements of double-beta
decay matrix elements and the determination of half-lives of double-beta
decaying nuclei (e.g. 48 Ca, 116 Cd).
Plenary Talk HK 22.2 Wed 09:00 P
New results from BaBar — •Matthias Steinke for the BaBar
collaboration — Institut für Experimentalphysik I, Ruhr-Universität
Bochum, Germany
The BaBar experiment at the asymmetric high luminosity e + -e − collider
PEP II located at the Stanford Linear Accelerator Center has
recorded about 150 fb −1 of data since November 1999 at the Υ(4S) resonance
(10.58 GeV). Main goal of the experiment is the investigation of
the CP violation in B systems, which could be confirmed experimentally,
and the precise determination of parameters of the CKM matrix.
Beside this BaBar offers excellent experimental conditions for investigations
in many more fields, especially in meson spectroscopy. Here the
search for exotic states is a main topic.
Recent results from BaBar with emphasis on new charmed meson
states will be presented.

Nuclear Physics Wednesday
Plenary Talk HK 22.3 Wed 09:30 P
First results from COMPASS — •Lars Schmitt for the COM-
PASS collaboration — TU München, Physik-Department E18, D-85747
Garching
COMPASS is a fixed-target experiment running with a 160 GeV muon
beam at CERN’s SPS accelerator. It is aimed at the study of the nucleon
spin structure using a polarized muon beam and a polarized 6 LiD target.
HK 23 Nuclear Structure/Spectroscopy IV
In a second phase, a hadronic beam will be used to investigate charmed
hadrons and hadrons with gluonic degrees of freedom, to study Primakov
and diffractive scattering and to search for exotic states.
The status of the ongoing analysis of gluon polarization via asymmetries
in D-meson and high-pT hadron pair production will be presented.
In addition preliminary results on Λ polarisation, exclusive vector meson
production, and other topics will be summarized.
Time: Wednesday 10:45–12:45 Room: A
Group Report HK 23.1 Wed 10:45 A
Feasibility of g Factor Experiments for Radioactive Beams
based on a first Measurement of Coulomb excited 76 Kr(2 + 1 )
— •K.-H. Speidel 1 , G. Kumbartzki 2 , N. Benczer-Koller 2 , K.
Hiles 2 , T.J. Mertzimekis 3 , M.J. Taylor 4 , M.A. McMahon 5 ,
L. Phair 5 , J. Powell 5 , L. Bernstein 6 , and J.R. Cooper 6 —
1 Helmholtz-Institut für Strahlen- und Kernphysik, Univ. Bonn —
2 Department of Physics and Astronomy, Rutgers. Univ. — 3 Michigan
State Univ. — 4 Univ. of Brighton — 5 LBNL Berkeley — 6 Lawrence
Livermore National Lab.
We report on a very first g factor measurement of the 2 + 1 state of
radioactive 76 Kr(T1/2 = 14.8 h) demonstrating that the technique of
projectile Coulomb excitation in inverse kinematics combined with transient
magnetic fields allows to determine g factors of radioactive beams
in general. The isotope was produced by the LBNL 88-Inch Cyclotron
in the 74 Se(α, 2n) 76 Kr reaction and transferred to the AECR ion source
of the cyclotron for acceleration to 230 MeV with intensities of ≈ 10 8
ions/s. De-excitation γ rays from Coulomb excitation with 26 Mg of a
multi-layered target, including a Gd layer for spin precessions, were detected
in coincidence with Mg ions by four Ge Clover detectors. A turning
magnetic tape placed in front of a Si solar cell was used to transport the
stopped beam radioactivity to a well-shielded area. Data were taken for
two hours after each production run including three cycles altogether. In
addition, stable 78 Kr has been measured to determine the angular correlation
and calibrate the effective transient field. The g factor deduced
is discussed in the framework of the IBA-II model.
HK 23.2 Wed 11:15 A
B(E2) and g Factor Measurements on 4 + 1 and 3 − 1 States of 64 Zn
and 68 Zn in the Light of Large-Scale Shell Model Predictions + —
•J. Leske 1 , K.-H. Speidel 1 , O. Kenn 1 , S. Schielke 1 , D. Hohn 1 ,
J. Gerber 2 , P. Maier-Komor 3 , and F. Nowacki 2 — 1 Helmholtz-
Institut für Strahlen- und Kernphysik, Univ. Bonn, D-53115 Bonn —
2 Institut de Recherches Subatomiques, F-67037 Strasbourg, France —
3 Physik-Dept. Technische Univ. München, D-85748 Garching
Predictions of g factors and B(E2) values by large-scale shell model
calculations on even-A Zn isotopes have motivated us to extend our systematic
measurements for the 2 + 1 states [1] to the higher excited 4 + 1 and
3 − 1 states. Besides improving the accuracy of such data for 64 Zn [2]
we have measured g factors and lifetimes of those states in 68 Zn. The
technique used was projectile Coulomb excitation on an isotopically pure
68 Zn beam of 180 MeV (from the Munich tandem accelerator) combined
with transient fields in ferromagnetic gadolinium of a multi-layered target;
natural carbon was used for Coulomb excitation. The lifetimes of
the excited states have been measured simultaneously with the spin precessions
using the Doppler-shift attenuation method. The g factors and
B(E2)’s deduced are compared with the results of shell model calculations.
+ supported by the DFG under Sp 190/9-2
[1] O.Kenn et al., Phys. Rev. C 65 (2002) 034308
[2] J.Leske et al.,Verhandl.DPG (VI) 38, 3/69 (2003)
HK 23.3 Wed 11:30 A
First g Factor Measurements with the MINIBALL Detector
Array for Stable 48 Ti Beams + — •J. Leske 1 , K.-H. Speidel 1 ,
O. Kenn 1 , S. Schielke 1 , J. Jolie 2 , N. Warr 2 , A. Scherillo 2 , P.
Maier-Komor 3 , and J. Gerber 4 — 1 Helmholtz-Institut für Strahlenund
Kernphysik, Univ. Bonn, D-53115 Bonn — 2 Institut für Kernphysik,
Univ. Köln, D-50937 Köln — 3 Institut de Recherches Subatomiques, F-
67037 Strasbourg, France — 4 Physik-Dept. Technische Univ. München,
D-85748 Garching
MINIBALL is an efficient detector array for the detection of γ rays especially
designed for measurements with low-intensity radioactive beams.
For gaining experience with MINIBALL for future experiments at REX
ISOLDE test measurements were performed at the Cologne tandem accelerator
(where the array was stationed temporarily) by redetermining
the known g factor of 48 Ti(2 + 1 )[1] in conditions similar to those at the
CERN facility. Four out of six modules of this array have been used, each
module consisting of three 6-fold segmented Ge detectors. These were
placed in pairs symmetric to the beam direction operated in coincidence
with recoil ions detected in an annular Si detector at 0 ◦ . 48 Ti beams
of 100 MeV were Coulomb excited to the 2 + 1 state by scattering from
a carbon layer of a multi-layered target. Ferromagnetic iron provided
the transient field for the spin precession. Particle-γ-angular correlations
were determined from the different angle positions of the individual Ge
detectors of the modules.
+ supported by the BMBF under 06BN111
[1] R. Ernst et al., Phys. Rev. Lett. 84 (2002) 416
HK 23.4 Wed 11:45 A
Relativistic Coulomb excitation of nuclei near 100 Sn: 108,112 Sn
— •Adriana Banu for the RISING collaboration — GSI, Darmstadt,
Germany — University of Mainz, Mainz, Germany
Nuclei in the vicinity of 100 Sn can be investigated to gain insight into
the structure of this, the heaviest N=Z doubly magic nucleus. The most
sensitive test of E2 correlations related to core polarization [1] are the
measurements of B(E2;2 + → 0 + ) values which have been investigated
presently. The first Coulomb excitation experiments on 108,112 Sn, performed
with the recent RISING-FRS [2] set-up at GSI, are being reported.
The radioactive projectile fragment 108 Sn and the stable 112 Sn at
the relativistic energies of 142 and 147 MeV/u respectively were focused
on to a gold target of 400 mg/cm 2 thickness, after being selected and
identified using the FRS fragment separator. The calorimeter telescope
(CATE) was used behind the target for the channel selection as well as
for measuring the scattering angle of the projectile fragments 108 Sn and
112 Sn. Gamma rays emitted from the excited fragments were detected by
the RISING Ge cluster detectors. The Doppler corrected γ lines corresponding
to the 2 + → 0 + transition have been identified in both 108,112 Sn
nuclei. The stable nucleus 112 Sn, with a known B(E2;2 + → 0 + ), is being
used to calibrate the measurement on 108 Sn. The analysis is in progress
and the results will be presented during the meeting.
[1] M.Górska et al.,Phys.Rev.C58(1998)108; M.Lipoglavˇsek et
al.,Phys.Lett.B440(1998)246
[2] http://www-aix.gsi.de/∼wolle/EB at GSI
HK 23.5 Wed 12:00 A
The concept of “specific heat” for nuclei — •S. Heinze 1 , P. Cejnar
2 , and J. Jolie 1 — 1 Institut für Kernphysik, Universität zu Köln
— 2 Institut of Particle and Nuclear Physics, Charles University
We study quantum phase transitions between nuclear ground-state
shapes using a simple Interacting sd-Boson Model hamiltionian. In our
previous work an analog of “specific heat” for quantum systems was
introduced in several alternative ways showing the similarity to phase
transitions in classical thermodynamics [1]. Now we introduce a new microscopic
way to calculate the “specific heat”. hamiltonian. It is based
on a connection of the thermodynamic partition function with the discriminant
of the quantum characteristic polynomial. The results based
on the new definition are compared to the older ones. This work was
supported by the DFG under grant # 436TSE1716103
[1] P. Cejnar, S. Heinze, J. Jolie, Phys. Rew. C 68 (2003) 034326.

Nuclear Physics Wednesday
HK 23.6 Wed 12:15 A
Final-state effects in the Coulomb breakup of exotic nuclei —
•Stefan Typel — GSI, Darmstadt
Properties of exotic nuclei have been studied extensively in recent years
by electromagnetic excitation with the help of the Coulomb breakup
method. These unstable nuclei are weakly bound with few, if any, excited
bound states and electromagnetic transitions to the continuum are
observed with large strength at low energies. Experiments are usually
analyzed in first order theories with simple structure models. However,
the importance of final-state effects from the interaction between the
fragments and between target and fragments have to be assessed in order
to obtain reliable information. Examples of these effects in both
reaction theory and structure models are discussed and their relevance is
estimated.
HK 23.7 Wed 12:30 A
Coulomb breakup of nuclei in the 132 Sn region — •Przemys̷law
Adrich for the S221 collaboration — GSI, Darmstadt, Germany —
Jagiellonian University, Krakow, Poland
We report on preliminary results from an experimental study of the
Coulomb breakup of heavy unstable nuclei covering about 20 isotopes
around the doubly-magic 132 Sn. The experiment in inverse kinematics
utilizes secondary ion beams at 550 MeV/u beam energy and was performed
with the LAND-FRS setup at GSI. The measurement is kinematically
complete in the rapidity domain of the projectiles. Coulomb
breakup in pheripheral heavy-ion collisions at high energy is a well established
tool for studying dipole excitations. In case of heavy, neutronrich
nuclei this method allows to test recent theoretical predictions of
new modes of collective excitations, i.e. oscillations of the skin neutrons
against the core of the nucleus [1,2]. Also new features of giant resonances
such as large fragmentation of strength due to the different occupation of
proton and neutron orbitals are expected to be observed in heavy exotic
nuclei [1,2,3]. Moreover the dipole response of neutron-rich nuclei was
considered in the context of the nucleosynthesis r-process [4].
[1] D. Vretenar et al., Nucl. Phys. A692 (2001) 496-517
[2] G. Colo et al., Nucl. Phys. A722 (2003) 111c-116c
[3] P.-G. Reinhard, Nucl. Phys. A649 (1999) 305c-314c
[4] S. Goriely, Phys. Lett. B436 (1998) 10-18
HK 24 Electromagnetic and Hadronic Probes III
Time: Wednesday 10:45–12:45 Room: B
Group Report HK 24.1 Wed 10:45 B
High energy electroproduction off complex nuclei — •Thomas
Falter, Wolfgang Cassing, Kai Gallmeister, and Ulrich
Mosel — Institut für Theoretische Physik, Universität Giessen, 35392
Giessen, Germany
We investigate hadron formation in high energy electroproduction
off complex nuclei in the framework of a BUU transport model. Our
approach [1-3] combines a quantum mechanical treatment of the
photon’s initial state interactions with a semi-classical coupled channel
simulation of the hadronic final state interactions. This allows us to
study different hadronization scenarios at JLab, HERMES and EMC
energies and to draw conclusion about the space-time picture of hadron
formation.
Work supported by BMBF and DFG.
[1] T. Falter and U. Mosel, Phys. Rev. C 66, 024608 (2002).
[2] T. Falter, K. Gallmeister, U. Mosel, Phys. Rev. C 67, 054606 (2003).
[3] T. Falter, W. Cassing, K. Gallmeister, U. Mosel, nucl-th/0303011.
HK 24.2 Wed 11:15 B
Nuclear Transparencies in Relativistic A(e,e’p) Models —
•Pascal Lava 1 , Cristina Martinez 2 , Jan Ryckebusch 1 , and
Bart Van Overmeire 1 — 1 University Ghent, Proeftuinstraat
86,9000 Gent ,Belgium — 2 Universidad de Sevilla,Apdo. 1065,E-41080
Sevilla, Spain
The transparency of the nuclear medium to nucleon propagation is of
crucial importance for understanding the dynamics of nucleons and nuclei.
For example, it is a well-suited quantity to look for the onset of
color transparency (CT), a phenomenon which is a natural consequence
of QCD.
Relativistic and unfactorized calculations for the proton transparency
in exclusive A(e, e ′ p) reactions for 0.3 ≤ Q 2 ≤ 10 GeV 2 will be presented.
The predictions compare favorably with the world-data for the target nuclei
1 2C, 56 Fe and 197 Au. For Q 2 ≥ 1 GeV 2 , the transparency results are
computed within the framework of the recently developed Relativistic
Multiple-scattering Glauber Approximation (RMSGA) [1]. These calculations
are essentially parameter free and rely on proton-nucleon scattering
data. The RMSGA predictions will be compared with relativistic distorted
wave calculations (RDWIA) which rely on optical proton-nucleus
potentials. Despite the very different model assumptions which underlie
the RMSGA and RDWIA frameworks, they predict similar transparencies
for kinematic regions where both models are applicable.
[1] J. Ryckebusch, D. Debruyne, P. Lava, S. Janssen, B. Van Overmeire
and T. Van Cauteren Nucl. Phys. A728 (2003) 226.
HK 24.3 Wed 11:30 B
Electromagnetic form factors of hyperons in a relativistic
quark model — •Tim Van Cauteren 1 , Dirk Merten 2 , Tamara
Corthals 1 , Stijn Janssen 1 , Bernard Metsch 2 , Herbert-R.
Petry 2 , and Jan Ryckebusch 1 — 1 Ghent University, Dept. of
Subatomic and Radiation Physics, Proeftuinstraat 86, B-9000, Gent,
Belgium — 2 Helmholtz-Institut für Strahlen- und Kernphysik, Nußallee
14-16, D-53115 Bonn, Germany
In describing meson electroproduction processes on the nucleon with
isobar models, the implementation of electromagnetic (EM) and strong
form factors constitutes one of the major sources of uncertainty. A relativistically
covariant constituent quark model offers the opportunity to
constrain some of the unknown form factors. Over the last decade, the
Bonn group has developed a relativistic quark model and has calculated
the EM form factors of nonstrange baryons. We have extended the model
to the strange baryon sector. We present our form factor results for the
ground-state hyperons and discuss their implementation into an isobar
model for kaon electroproduction. The computed magnetic moments
agree well with the experimental values and the magnetic form factors
follow a dipole Q 2 dependence.
References : 1 T. Van Cauteren et al., nucl-th/0310058. 2 D. Merten
et al., Eur. Phys. J. A14, 477 (2002). 3 U. Löring et al., Eur. Phys. J.
A10, 309 (2001).
HK 24.4 Wed 11:45 B
Finite density QCD sum rules in the large-Nc limit — •Stefan
Leupold and Marcus Post — Institut für Theoretische Physik, Universität
Giessen, 35392 Giessen, Germany
QCD sum rules are analysed for finite nuclear density for the ρ-meson
channel. On the condensate side in-medium changes can be calculated in
the linear density approximation. On the hadronic side various physical
effects lead to modifications of the current-current correlator, e.g. (a)
changes of the pion cloud of the ρ-meson, (b) excitation of nucleon-hole
states N N −1 and (c) excitation of resonance-hole states R N −1 . In principle,
it is complicated to disentangle these effects in sum rule analyses.
It is shown that in the limit of infinitely many colors the numerically
most important in-medium changes of the condensate side remain. On
the other hand, on the hadronic side only the resonance-hole excitations
survive. Assuming that the dominant excitation is the D13(1520) we
determine the coupling constants of the latter with the ρ-nucleon and
the photon-nucleon system. We obtain reasonable agreement with the
experimental situation. In particular, we extract a partial decay width
of the D13 into ρ-N of about 12 MeV.
Work supported by GSI.
HK 24.5 Wed 12:00 B
Compton Scattering off the Deuteron in Chiral Effective Field
Theory — •Robert P. Hildebrandt, Harald W. Grießhammer,
and Thomas R. Hemmert — Institute for Theoretical Physics (T39),
TU München, Germany

Nuclear Physics Wednesday
Due to the lack of stable single neutron targets for Compton scattering,
experimental access to the neutron polarizabilities is much harder than
in the proton case. One possible way to determine the neutron polarizabilities
is Compton scattering off the deuteron. Therefore, an accurate
description of the Chiral Dynamics inside the deuteron is needed, as one
has to correct for the proton polarizabilities and binding effects. In this
work, we extend Chiral Effective Field Theory calculations of Compton
scattering off the deuteron [1] by explicit ∆(1232) degrees of freedom,
finding very good agreement with experimental data [2]. We discuss the
well-known problem to recover the correct Thomson-limit and show how
to solve it [2]. Finally we present our results for fits of the static neutron
dipole polarizabilities ¯α n E1 and ¯ β n M1
to experimental data, which are in
good agreement with experimental values and ChEFT predictions [2].
Work supported in part by DFG and BMBF.
[1] S.R. Beane, M.Malheiro, D.R. Phillips and U. van Kolck,
Nucl. Phys. A 656, 367.
[2] R.P. Hildebrandt, H.W. Grießhammer, T.R. Hemmert and
D.R. Phillips, forthcoming.
HK 24.6 Wed 12:15 B
Electromagnetic N to ∆ transition in the perturbative chiral
quark model — •Kem Pumsa-ard, V. E. Lyubovitskij, Th.
Gutsche, and Amand Faessler — Institut für Theoretische Physik,
Universität Tübingen, D-72076 Tübingen, Germany
HK 25 Instrumentation and Applications III
We study the electromagnetic N to ∆ transition in the manifestly
Lorentz invariant quark model. This is the improved version of
our previous model, the perturbative chiral quark model (PCQM)
[1]. The helicity amplitudes and the ratio E2/M1 for this transition
are studied. Our results are in good comparison to the experimental data.
[1] V. E. Lyubovitskij, Th. Gutsche and A. Faessler, Phys. Rev. C 64
(2001) 065203; V. E. Lyubovitskij et al., Phys. Rev. C 65 (2002) 025202;
C 66 (2002) 055204; C 68 (2003) 015205; Phys. Lett. B 520 (2001) 204
HK 24.7 Wed 12:30 B
Dual parametrization of generalized parton distributions and
DVCS data — •Vadim Guzey 1 and Maxim Polyakov 2 — 1 Ruhr-
Universität Bochum, Univesität Str., 150 — 2 Liege University, Belgium
We further develop a parametrization of generalized parton distributions
(GPDs) in terms of the infinite series of t-channel exchanges
(the dual model by Polyakov and Shuvaev). The main advantages of
the model include: clear physical interpretation of the model parameters(motivated
by the Regge theory), polynomiality (the so-called D-term
is present), flexibility (possibility to study t-dependence of GPDs). We
demonstrate that with the dual model of GPDs one is able to obtain a
good description of all available DVCS data on the total cross section,
beam-spin and beam-charge asymmetries. Hence, we advocate the dual
parametrization of GPDs as a sound alternative to the commonly used
double distribution model.
Time: Wednesday 10:45–12:45 Room: C
Group Report HK 25.1 Wed 10:45 C
Status and Future Plans of the Cooler Synchrotron COSY
— •Bernd Lorentz, Ulf Bechstedt, Juergen Dietrich, Ralf
Gebel, Andreas Lehrach, Rudolf Maier, Dieter Prasuhn,
Alexander Schnase, Herbert Schneider, Rolf Stassen, Hans
Stockhorst, and Raimund Toelle — Forschungszentrum Juelich,
Germany
The cooler synchrotron COSY delivers unpolarized and polarized protons
and deuterons in the momentum range between 600 MeV/c to 3.65
GeV/c to internal and external experiments. To provide high quality
beams, an Electron Cooler at injection energy and a Stochastic Cooling
System from 1.5 GeV/c up to maximum momentum are available.
Vertically polarized proton beams with a polarization of more than
0.80 are delivered to external experiment areas at different momenta up
to the maximum momentum of COSY. In the last year deuteron beams
with different combinations of vector and tensor polarization were delivered
to internal and external experiments.
In this report the status of the cooler synchrotron COSY is presented
and future plans are discussed.
HK 25.2 Wed 11:15 C
Status and Perspectives of the S-DALINAC — •Christoph
Heßler 1 , Wolfgang Ackermann 2 , Marco Brunken 1 , Joachim
Enders 1 , Mykhaylo Gopych 1 , Hans-Dieter Gräf 1 , Timo
Hartmann 1 , Michael Hertling 1 , Anton Karnaukhov 1 , Sergiy
Khodyachykh 1 , Marco Kunze 2 , Ulrich Laier 1 , Alexander
Lenhardt 1 , Wolfgang F.O. Müller 2 , Olexandr Patalakha 1 ,
Markus Platz 1 , Achim Richter 1 , Otto Titze 1 , Thomas
Weiland 2 , and Steffen Watzlawik 1 — 1 Institut für Kernphysik,
Technische Universität Darmstadt, Schlossgartenstrasse 9, 64289 Darmstadt
— 2 Institut für Theorie Elektromagnetischer Felder, Technische
Universität Darmstadt, Schlossgartenstrasse 8, 64289 Darmstadt
The superconducting linear electron accelerator S-DALINAC provides
a cw electron beam of energies up to 130 MeV at a repetition rate of 3
GHz for nuclear physics experiments. Current activities for the improvement
of the accelerator regard the redesign of the control system utilizing
CAN bus, the development of new RF power sources, RF input couplers,
frequency tuners as well as the modification of the injector cryostats. The
concepts of the redesign and first results gained with a test set-up for the
RF part of the control system as well as systematic measurements of the
TM010 mode frequencies and resulting conclusions will be discussed. For
dedicated nuclear physics a source for polarized electrons is developed
in close cooperation with MAMI (Mainz) and CEBAF (Newport News,
USA). The layout and first results will be shown.
Funded by the DFG (SFB 634 and GRK 410/2)
HK 25.3 Wed 11:30 C
The REX-ISOLDE energy upgrade — •O. Kester, D. Habs,
H. Bongers, T. Sieber, K. Rudolph, and M. Pasini for the
REX-ISOLDE collaboration — Sektion Physik der LMU München, Am
Coulombwall 1, D-85748 Garching
In 2002 the REX-ISOLDE LINAC served radioactive ion beams for
a bunch of experiment. The LINAC delivered beams with energies of
0.3, 2 and 2.2 MeV/u to the two target stations. Due to the charge
state breeder very different mass regions of the nuclear chart could be
addressed. In order to perform Coulomb excitation and particle transfer
experiments in the mass region up to A = 150, an energy upgrade of the
LINAC is required, which is foreseen in several steps. A new cavity for
the first upgrade step to 3.1 MeV/u has been installed, which employs
one of the MAFF 202.56 MHz IH-7gap-cavity. The second step to energies
above to 4 MeV/u will be a mayor change of the LINAC structure.
There two 7-gap spiral resonators of REX-ISOLDE will be exchanged
by a 202 MHz IH-cavity. Design calculations, cavity design and first
measurements with the IH-9gap-cavity will be presented.
HK 25.4 Wed 11:45 C
The new ion beam analysis facility of the University of Cologne
— •Thomas Materna, Petra Kudějová, and Jan Jolie — Institut
für Kernphysik, Universität zu Köln, Zülpicher Str. 77, D-50937
Köln
The new ion beam analysis (IBA) facility is situated at the 10-MV
tandem accelerator of the Nuclear Physics Institute of the University of
Cologne. It is dedicated to non-destructive atomic and nuclear techniques
aiming 1) to determine probe composition, major and trace elements,
with very low detection limits (PIXE and PIGE), 2) to determine depth
profile information (RBS). The facility includes a fast scanning system
allowing the determination of a two dimensional map of the major elements
contained in the sample. The scanned area can be as big as 6x6
cm 2 and the beam size can be reduced to below 1 mm 2 . Another feature
of this facility is that the spectra are acquired using digital electronics.
HK 25.5 Wed 12:00 C
Spin movement in a figure of 8 accelerator — •K. Kilian, A.
Lehrach, and R. Maier — Institut für Kernphysik, Forschungszentrum
Jülich, 52425 Jülich
The spin vector of particles stored in a planar ring synchrotron can be
stabilized in the vertical direction. Horizontal components in the plane

Nuclear Physics Wednesday
of the accelerator average to zero very fast. A planar figure of 8 accelerator
without any horizontal magnetic field components would restore any
spin orientation at a given position in every turn. Small horizontal disturbances,
especially from fringe fields will lead to comparatively slow spin
movement which will make in average polarisation zero. If this movement
is slow enough and coherent one might use this in experiments.
Combination of the crossover accelerator structure with Wienfilters or
Solenoids open some new possibilities for spin stabilization.
HK 25.6 Wed 12:15 C
CONCEPTUAL DESIGN OF A HIGH CURRENT
DEUTERON RFQ — •Chuan Zhang 1 , Alwin Schempp 1 ,
Zhi-Yu Guo 2 , Jia-Er Chen 2 , and Jia-Xun Fang 2 — 1 Iap Frankfurt
— 2 IHIP, Peking University
A 50mA deuteron RFQ is proposed for the thermal neutron generator
project at Peking University, China. Design studies have been performed
with the ParmteqM and Microwave Studio codes to optimize the structure
design, concerning minimum beam losses, the limited RF power and
the demands of safety maintenance. Results of a conceptual design with
a compact structure and high transmission efficiency is presented.
HK 26 Theory IV
HK 25.7 Wed 12:30 C
Development of finger drift tubes — •Kai-Uwe Kuehnel 1 ,
Carsten Peter Welsch 2 , and Alwin Schempp 1 — 1 IAP Frankfurt
— 2 MPI-K Heidelberg
Since RFQs decrease in their acceleration efficiency at higher energies
and drift tube structures have a defocussing effect on the beam, a new
kind of drift tube linac is being studied in Frankfurt. By mounting small
fingers with quadrupole symmetry on the drift tubes, a focusing field
component is added to the accelerating field. Driven by the same power
supply as the drift tubes, the fingers do not need an additional power
source or feedthrough. The beam dynamics of such a cavity has been examined
with PARMTEQ. Simulations of the rf properties have been done
using microwave studio. A prototype of a spiral loaded cavity with finger
drift tubes has been built and examined. Results of the calculations as
well as low level and bead pertubation measurements are presented in
this contribution.
Time: Wednesday 10:45–12:45 Room: D
Group Report HK 26.1 Wed 10:45 D
Nucleon mass, sigma term and lattice QCD — •Massimiliano
Procura 1,2 , Thomas Hemmert 1 , and Wolfram Weise 1,2 —
1 Physik Department, Theoretische Physik T39, TU München, Germany
— 2 ECT ∗ , Trento, Italy.
We analyse the quark mass dependence of the nucleon mass in relativistic
SU(2) baryon chiral perturbation theory as described in [1]. In
such a framework we perform an interpolation of this nucleon property
between a selected set of fully dynamical two-flavor lattice QCD data [2]
and its physical value. We obtain a good interpolation function already
at the one-loop level. We show that the next-to-leading one-loop corrections
are small. Using results from such analysis we study also the quark
mass dependence of the pion-nucleon sigma term.
Work supported in part by BMBF and DFG.
[1] T. Becher and H. Leutwyler, Eur. Phys. J. C9, 643 (1999).
[2] M. Procura, T. Hemmert and W. Weise, [hep-lat/0309020],
submitted to Phys. Rev. D.
HK 26.2 Wed 11:15 D
The Nucleon in a Box — •T.R. Hemmert for the QCDSF and
UKQCD collaboration — Physik Department T39, TU München
The quark mass dependence of the nucleon in relativistic baryon chiral
perturbation theory (BChPT) has been discussed to next-to-leading one
loop order in [1]. It was found that the resulting chiral extrapolation
formula agrees well with lattice QCD simulation data for effective lattice
pion masses between 500-750 MeV, provided that one selects only those
simulation points obtained at lattice sizes larger than 1.8 fm. When the
size of the simulation volume is further reduced, the quark mass dependence
of the mass of the nucleon is different from the one given in [1], due
to greater sensitivity to the exact boundary conditions of the finite box
size. These finite size effects on the nucleon mass have been calculated
[2], utilizing the same relativistic BChPT framework. At next-to-leading
one loop order one finds good agreement between the volume dependence
predicted by ChPT and the finite size effects observed in lattice
QCD simulations. We also discuss how finite size effects in lattice QCD
simulations of baryon properties can be understood within the framework
of ChPT [3].
[1] M. Procura, T.R. Hemmert and W. Weise, [hep-lat/0309020].
[2] QCDSF and UKQCD collaboration, [hep-lat/0309133].
[3] QCDSF and UKQCD collaboration, forthcoming.
This work has been supported in part by BMBF and DFG.
HK 26.3 Wed 11:30 D
Chiral Extrapolations and Non-Analytic Terms — •Dominik
Nickel, Michael Buballa, and Jochen Wambach — IKP, TU
Darmstadt, Germany
Since lattice QCD is so far limited to unrealistically large quark masses
(corresponding to pion masses of 400 MeV or more), the resulting observables
must be extrapolated to the physical point. Usually this is done
by simple polynomial fits to the data. It has also been suggested to employ
chiral models for the extrapolations in order to ensure the correct
non-analytic behavior in the chiral limit. In this talk, we investigate the
relevance of the leading non-analytic (LNA) terms and present results
obtained with the 1/Nc-corrected NJL model. It will be shown that the
LNA terms, which are also formally reproduced correctly by the NJL
model, give a very poor description of the mπ dependence of the hadron
masses, mainly because of the implicit definition of the masses as the
poles of the dressed propagators.
HK 26.4 Wed 11:45 D
Excited nucleons on the lattice with chirally improved fermions
— •Dirk Brömmel 1 , Peter Crompton 1 , Christof Gattringer 1 ,
Leonid Ya. Glozman 2 , C.B. Lang 2 , Stefan Schaefer 3 , and Andreas
Schäfer 1 for the BGR [Bern - Graz - Regensburg] collaboration
— 1 Universität Regensburg — 2 Universität Graz — 3 University of Colorado
at Boulder
We study positive and negative parity nucleons on the lattice using
the chirally improved lattice Dirac operator. Our analysis is based on a
set of three operators χi with the nucleon quantum numbers. We use a
variational method to separate ground state and excited states and determine
the mixing coefficients for the optimal nucleon operators in terms of
the χi. We clearly identify the negative parity resonances N(1535) and
N(1650) and their masses agree well with experimental data. The mass
of the observed excited positive parity state is too high to be interpreted
as the Roper state. Our results for the mixing coefficients indicate that
chiral symmetry is important for N(1535) and N(1650) states.
HK 26.5 Wed 12:00 D
I = 2 pion scattering length with chirally improved fermions —
•Dieter Hierl, Christof Gattringer, Rainer Pullirsch, and
Andreas Schäfer — Institut für theoretische Physik, Universität Regensburg,
D-93040 Regensburg, Germany
We report on a lattice calculation of the pion scattering length in the
I = 2 channel using the chirally improved lattice Dirac operator. The
scattering length is extracted by using the standard finite volume technique
of Lüscher. We find that the most difficult part is to minimize
the errors for the 4-pion-correlators. We work with pion masses down
to 310 MeV in the quenched approximation. The scattering lengths we
obtained are extrapolated to the chiral limit. We find a good agreement
with experimental data.

Nuclear Physics Wednesday
HK 26.6 Wed 12:15 D
Automated Lattice Perturbation Theory and Decays of Heavy
Quarkonia — •G.M. von Hippel 1 , R.R. Horgan 1 , and A.G. Hart 2
— 1 DAMTP, University of Cambridge, England — 2 University of Edinburgh,
Scotland
We present a method for the automated generation of vertices in perturbative
Lattice QCD using a Python script, which due to its modular
structure can easily be adapted for pure gauge theory, staggered fermions,
or other fermionic actions, including NRQCD.
As an example, we show how to compute the matching coefficients for
S-wave decays of heavy quarkonia between Lattice NRQCD and continuum
QCD to O(αsv 2 ) using our methods.
HK 26.7 Wed 12:30 D
The Quark-Mass Dependence of TC in QCD: Working up from
m = 0 or down from m = ∞ ? — •Dirk Röder, Adrian Dumitru,
and Jörg Ruppert — JWG-Universität, Robert-Mayer-Str.10,
D-60054 Frankfurt am Main
We analyze the dependence of the QCD transition temperature on the
quark (or pion) mass. We find that a linear sigma model, which links the
transition to chiral symmetry restoration, predicts a much stronger de-
>
pendence of Tc on mπ than seen in present lattice data for mπ
∼ 0.4 GeV.
On the other hand, working down from mπ = ∞, an effective Lagrangian
for the Polyakov loop requires only small explicit symmetry breaking,
b1 ∼ exp(−mπ), to describe Tc(mπ) in the above mass range. Physically,
this is a consequence of the flat potential (large correlation length) for
the Polyakov loop in the three-color pure gauge theory at Tc. We quantitatively
estimate the end point of the line of first order deconfining phase
transitions: mπ ≃ 4 √ σ ≃ 1.7 GeV for Nf = 3.
HK 27 Electromagnetic and Hadronic Probes IV
Time: Wednesday 10:45–12:45 Room: E
Group Report HK 27.1 Wed 10:45 E
GDH sum rule completed up to 3 GeV — •Jochen Krimmer for
the GDH collaboration — Physikalisches Institut der Universität Tübingen,
Germany
The GDH sum rule connects helicity dependent total photoabsorption
cross sections with static properties of the nucleon like the mass and the
anomalous magnetic moment. Experiments for its direct experimental
check have been performed at the tagged photon facilities of the electron
accelerators MAMI and ELSA. Circularly polarized photons have been
used together with a longitudinally polarized nucleon target and 4π detector
systems. As the experiments cover an energy range from 200 MeV
to 3 GeV, double polarized photoabsorption cross sections are available
for the first time from the resonance region to the onset of Regge behaviour.
Furthermore, exploratory data have been taken on the neutron
with a polarized 6 LiD target.
This work is supported by DFG under contract GRK683 & GR1084/5-1.
HK 27.2 Wed 11:15 E
Status of the GDH-Experiment on the deuteron at MAMI
— •Andreas Thomas for the A2-collaboration collaboration and the
nGDH-collaboration collaboration — Institut f”ur Kernphysik Universit”at
Mainz
A pilot experiment to determine the helicity dependend total and
partial photoabsorption cross sections had been carried out in 1998 at
MAMI. The full data taking period was sucessfully finished in the first
half of 2003. We have used the circularly polarized energy marked photons
of the Mainz A2 tagging facility. For this experiments the Bonn-
Bochum frozen spin was integrated into the 4π DAPHNE detector.
In this talk the experimental setup, preliminary results of the pilot
experiment and the status of the data analysis will be presented.
HK 27.3 Wed 11:30 E
Dynamics of the ω Meson Production in the Reaction pp → ppω
— •M. Schulte-Wissermann, K.-T. Brinkmann, S. Dschemuchadse,
H. Freiesleben, R. Jäkel, L. Karsch, and G.Y. Sun for
the COSY-TOF collaboration — TU-Dresden
The ω meson production in nucleon-nucleon interactions has recently
attracted considerable interest on the part of both experimental and theoretical
physics. The elementary reaction dynamics is needed as an inevitable
prerequisite in many fields of physics; e.g. the short range part
of the nucleonic force (meson exchange models), the description of extremely
dense matter (RHIC, cosmology), the strangeness content of
nucleons (nuclear physics). However, the experimental database is far
from complete, especially for differential observables. Furthermore, no
experimental indication for Nω resonances has been found so far. New
experimental data with high accuracy are desired.
Due to its good solid angle coverage, the TOF-detector located at COSY
is well suited to examine ω production in the reaction pp → ppω. At excess
energies of 93 and 173MeV the ω signal is clearly identified above
background. Total cross sections and angular distributions for both en-
ergies will be presented, where the latter are isotropic at 93MeV while
strongly anisotropic at 173MeV . Although still compatible with phasespace
within uncertainty limits, the invariant mass distributions of the
pω-system may indicate a pω-resonance near the lower mass boundary.
(Supported by BMBF and FZ-Jülich)
HK 27.4 Wed 11:45 E
Omega photoproduction off solid targets — •David Trnka for the
CBELSA/TAPS collaboration — II. Physikalisches Institut, Heinrich-
Buff-Ring 16, 35392 Giessen
Omega photoproduction off solid targets is a powerfull tool to investigate
possible in-medium modifications of hadronic properties. A variety
of theoretical models predict a shift of the omega meson mass in the order
of −140MeV < m ∗ −mV < −15MeV and a broadening of the width
within a range of 20 to 50 MeV at normal nuclear densities (i.e. :[1]).
From March to May 2003 data off C, Ca, Nb and Pb has been obtained
at the ELSA accelerator facility in Bonn using the combined detector
system of Crystal Barrel and TAPS, providing an almost 4π coverage for
photon (and also charged particle) detection. The incident electron beam
energy was chosen to be 2.8 GeV. The photon beam is produced via the
Bremsstrahlung process off a thin radiator, covering a tagged range of 31
to 94 % of the incident beam energy. The Reaction γ + A → ω + X is
identified via the decay mode ω → π 0 +γ → γγγ by detecting the three
photons. Simulations ([2]) prove the feasibility of measuring in-medium
modifications and show that distortions due to FSI of the pions can be
eliminated. First indications of an ω mass shift have been observed and
the dependence on the ω-momentum has been studied. These prelimary
results will be compared to recently published calculations, which take
the experimental resolution into account ([3]).
[1] T. Renk et al. , Phys. Rev. C 66, (2002) 014902
[2] J. G. Messchendorp et al. , Eur. Phys. J. A. 11, 95-103 (2001)
[3] P. Mühlich et al., arXiv:nucl-th/0310067
HK 27.5 Wed 12:00 E
Exclusive Measurements of the �pp → ppπ + π − Reaction at COSY-
TOF ∗ — •A. Erhardt, J. Kress, H. Clement, E. Doroshkevich,
and G.J. Wagner for the COSY-TOF collaboration — Physikalisches
Institut, Universität Tübingen
By use of the COSY vector polarized proton beam the �pp → ppπ + π −
reaction has been measured at COSY-TOF at two different energies,
Tp = 750 and 800 MeV, i.e. close to threshold. Time-of-flight information
and track reconstruction has been obtained by use of the informations
supplied by start, fiber, quirl and ring hodoscopes, whereas particle
identification and energy information has been provided by the central
calorimeter. In addition, delayed pulse technique has been utilized for a
positive identification of π + particles. The dominant part of the extracted
data samples consist of completely measured 4 prong events, i.e. exclusively
measured events with 4 overconstraints each. This way very clean
data have been obtained. The resulting differential spectra for invariant
masses, angular distributions and analyzing powers will be presented
and discussed with respect to model calculations for σ meson production

Nuclear Physics Wednesday
and/or excitation and decay of the Roper resonance. ∗ supported by
BMBF (06 TU 201), DFG (Europ. Graduiertenkolleg), FZ Jülich (FFE)
and Landesforschungsschwerpunkt (Quasiteilchen)
HK 27.6 Wed 12:15 E
Search for the γγ Decay of the σ-Meson at CELSIUS-WASA ∗ —
•M. Bashkanov, H. Clement, E. Doroshkevich, M. Kaskulov,
R. Meier, T. Skorodko, and G.J. Wagner for the CELSIUS-WASA
collaboration — Physikalisches Institut, Universität Tübingen
The γγ decay of the σ meson, though likely to be extremely small,
provides a key information about its nature, in particular its q¯q and
q¯qq¯q contents. From the reverse reaction γ ∗ γ ∗ → ππ, which has been
investigated by CLEO and Crystal Ball, estimates for σ → γγ have been
obtained [1]. In the current study at WASA we consider the hadronic production
of σ and its potentially successive γγ decay by pp → ppσ → ppγγ
at Tp = 1360 MeV, i.e. at the energy, where most of the statistics has
been accumulated so far. Between the π 0 and η peaks in Mγγ we observe
for Mγγ > 350 MeV a low-statistics continuum of counts which may be
associated with incomplete detection of π 0 π 0 production. However, near
the π 0 π 0 threshold and in particular below it we observe some structure,
which in MC simulations cannot be explained by π 0 , π 0 π 0 and η
production or any detector features known so far. On the other hand,
the shape of the observed structure would be consistent with a σ → γγ
decay, where the strength above the π 0 π 0 threshold is expected to be
heavily quenched due to the opening of the overwhelmingly strong ππ
decay channel.
[1] PDG, Phys. Rev. D66, 1 (2002) and references therein
HK 28 Nuclear and Particle Astrophysics I
∗ supported by BMBF (06 TU 201), DFG (Europ. Graduiertenkolleg)
and Landesforschungsschwerpunkt (Quasiteilchen)
HK 27.7 Wed 12:30 E
Investigation of the isospin related reactions pd → (A = 3)π —
•Hartmut Machner for the GEM Collaboration collaboration —
Inst. f. Kernphysik FZ Jülich
We have studied the cross sections for the isospin related reactions
pd → (A = 3)π. Both reactions were measured simultaneously, thus
reducing the systematical errors of the ratio of both reactions considerably.
The data span an energy range covering the ∆ resonance region up
to the N ∗ (1535) region. The experiments, performed at COSY Jülich,
made use of the GEM detector system, i.e. the Germanium wall and the
3Q2D magnetic spectrograph. The recoiling 3 He and 3 H were identified
and their four momentum vectors were measured. The data in the ∆
region span the full angular range. Those in the threshold region of the
N ∗ (1535) are taken at the maximum momentum transfer from the incident
proton to the nucleus. The data in the ∆ resonance region consist
of two components: a low momentum transfer part and a high momentum
transfer part. The first shows isospin symmetry breaking in the
differential quantities. The second one seems to obey isospin symmetry.
The data in the threshold region of the N ∗ (1535) show strong deviation
from isospin symmetry. The reaction mechanism is studied by comparing
the data to different models including one and two step processes.
Also the question of the interaction of an intermediate η − 3 He final state
interaction is addressed.
Time: Wednesday 10:45–12:45 Room: F
Group Report HK 28.1 Wed 10:45 F
Nuclear Astrophysics: Progress in Static Burning — •Frank
Strieder — Institut für Experimentalphysik III, Ruhr-Universität
Bochum, Germany
The Nuclear Astrophysics program at the Ruhr-Universität Bochum
consists of three main tasks: ERNA, LUNA, and Electron Screening
measurements. This talk will give an overview about the projects and
discuss both, status and future prospects of the experiments.
In short, for improved cross section measurements of the reaction
12 C(α,γ) 16 O a recoil separator ERNA (European Recoil Separator for
Nuclear Astrophysics) has been developed at the 4 MV Dynamitron tandem
accelerator in Bochum to detect directly the 16 O recoils with high
efficiency. The LUNA collaboration (Laboratory Underground for Nuclear
Astrophysics) studies at the Gran Sasso underground lab the low
energy cross section of capture reactions, e.g. 14 N(p,γ) 15 O, but also other
(α,γ) and (p,γ) reactions in the future. Both experiments demonstrate
the power of small accelerator facilities in Nuclear Astrophysics experiments.
The experimental studies of the electron screening is another
research field. The observed enhancement factors are in many cases significantly
larger than could be accounted for from the adiabatic limit. In
a series of experiments at the 100 kV accelerator in Bochum this effect has
been studied in the reaction d(d,t)p for various deuterated metals. The
opportunity of future measurements of the electron screening in other
reactions will be presented.
The projects are supported by Deutsche Forschungsgemeinschaft (Ro
429/35-2, Ro 429/39-1) and BMBF (05CL1PC1/1).
HK 28.2 Wed 11:15 F
The physics of the knee in the energy spectrum of cosmic rays —
air shower measurements with KASCADE — •Jörg R. Hörandel
for the KASCADE collaboration — Universität Karlsruhe, Institut
für Experimentelle Kernphysik, Hermann-von-Helmholtz-Platz 1, 76344
Leopoldshafen
The origin of high-energy cosmic ray particles, the processes of their
propagation through the galaxy, and the origin of the knee in their energy
spectrum are among the most interesting questions in particle astrophysics.
The large multi-component air shower experiment KASCADE is
operated since 1996 in order to address these issues. It measures the electromagnetic,
muonic, and hadronic components of extensive air showers
simultaneously in the energy range from below 10 14 to above 10 17 eV. Deriving
conclusions of astrophysical relevance from air shower data needs
a correct understanding of the cosmic-ray induced high-energy hadronic
interactions in the atmosphere. Recent tests of hadronic interaction models
used to describe the development of air showers in simulation codes
such as CORSIKA are presented. Experimental access to the above mentioned
astrophysical questions is provided through the measurement of
the cosmic-ray mass composition, energy spectrum, and arrival directions.
Actual results on the anisotropy of cosmic rays including a search
for point sources will be discussed. A review of recent results, derived
from different shower components, on the primary energy spectrum and
the mass composition of cosmic rays is given and primary energy spectra
for elemental groups will be presented.
HK 28.3 Wed 11:30 F
Isotopic abundance ratios in ultra-metal-poor Halo stars —
•Bernd Pfeiffer, Khalil Farouqi, and Karl-Ludwig Kratz —
Inst. f. Kernchemie, Mainz, Germany
So far, optical spectroscopy of Halo stars yielded mostly elemental
abundances. With this the separation of the individual contributions of
the 2 neutron-capture processes (s- and r-process) is not unambiguous.
Recently, isotopic abundances of some rare-earth elements have been
measured [1].
We calculate isotopic abundance ratios for Ba, La and Eu within the
classical r-process approach and the high-entropy wind SNII scenario for
different stellar conditions. Comparing our results with observations, the
stellar evolution of s- and r-process nucleosynthesis in the early Galaxy
can be studied.
[1] C. Sneden et al., APJ 526, L25 (2002); D.L. Lambert et al., MNRAS
335, 325 (2002)
HK 28.4 Wed 11:45 F
Quest for a nuclear georeactor — •Rob de Meijer, Emiel van
der Graaf, and Klaus Jungmann for the collaboration — Kernfysisch
Versneller Instituut, Groningen, The Netherlands
Little is known about the interior of our planet. Questions still under
debate are the role of U and Th in the energy production inside and
the origin of the Earth’s magnetic field. Another intriguing issue is the
presence of 3 He in our atmosphere.
Recently a 8 km diameter nuclear georeactor at the Earth’s centre was
proposed. Such a reactor is so large that it breeds its own 235 U and tritium
is produced via ternary fission. Calculations indicate that sufficient
tritium is produced to explain the high 3 He/ 4 He ratios at volcanoes. Poisoning
by fission products may reduce or shut down the reactor and so
decrease and flip the geomagnetic field.

Nuclear Physics Wednesday
One way to investigate the U and Th distribution and the hypothesis
of a georeactor, is to measure the anti-neutrinos produced in the
respective decay and fission processes. Such measurements are feasible
in an underground laboratory, provided the background due to the geological
formation and anti-neutrinos produced in nuclear power reactors
is sufficiently low. This condition hampers observation in the existing
underground laboratories.
We propose to construct an underground laboratory at a location with
a low-background and away from nuclear reactors. For this laboratory
an anti-neutrino detector has to be developed with some directional sensitivity.
HK 28.5 Wed 12:00 F
What neutral-current ν− 208 Pb scattering can tell about supernova
neutrinos — •N. Jachowicz, K. Vantournhout, K. Heyde,
and J. Ryckebusch — Institute for Subatomic and Radiation Physics,
Ghent University, Proeftuinstraat 86, B-9000 Gent, Belgium
In a type II supernova explosion an enormous amount of
(anti)neutrinos of all flavours is emitted. They are escaping from very
close to the center of the star, carrying away by far the largest part of
the released energy. The terrestrial detection of these neutrinos would
provide invaluable information on the supernova event. We present cross
section calculations for neutral-current neutrino scattering off 208 Pb and
discuss the relevance of various aspects of these processes for the detection
of supernova neutrinos. We examine the influence of the supernovaneutrino
energy-spectrum on the response and discuss the importance of
the distribution’s average energy and width. We note a large sensitivity
of the folded cross sections to the high energy tail of the spectrum.
Since a galactic supernova is a rare occurrence, it is crucial to gather
as much information as possible in the event. Distinguishing between
neutrinos and antineutrinos can give additional information. Therefore,
we investigate the spin dependence of nucleon knockout processes and
observe considerable asymmetries in the polarization characteristics of
the outgoing nucleons. These asymmetries are strongly dependent on
the helicity of the incoming neutrino, and hence provide a potential way
to distinguish between neutrinos and antineutrinos in neutral current
processes.
HK 29 Nuclear Structure/Spectroscopy V
HK 28.6 Wed 12:15 F
Electron Screening in metals — •Franceso Raiola and Claus
Rolfs for the LUNA collaboration — Institut für Experimentalphysik
III, Ruhr-Universität Bochum, Universitätsstr. 150, 44780 Bochum
The electron screening effect in the d(d,p)t reaction has been studied
at the Ruhr-Universität Bochum for 30 deuterated metals and 11 deuterated
insulators/semiconductors. The deuterated metals were produced
via implantation of low-energy deuterons.
As compared to measurements performed with a gaseous D2 target, a
large effect has been observed in the metals. An explanation of the large
effect in metals is possibly provided by the classical plasma screening of
Debye applied to the quasi-free metallic electrons.
A critical test of the classical Debye model is the temperature dependence
Ue ∝ T 1/2 . This temperature testing is on the way and new results
will be presented. We thank Sheng Zeng (China) for the assistance during
the experiment.
HK 28.7 Wed 12:30 F
2 Flavour superconductivity in compact stars — •Deborah
Nancy Aguilera 1,2 , David Blaschke 1,3 , Deog Ki Hong 4 , and
Hovik Grigorian 5 — 1 Fachbereich Physik, Universität Rostock,
Universitätsplatz 1, D-18051 Rostock, Germany — 2 Instituto de
Física Rosario, Bv. 27 de febrero 210 bis, 2000 Rosario, Argentina —
3 Bogoliubov Laboratory for Theoretical Physics, JINR Dubna, 141980
Dubna, Russia — 4 Department of Physics, Pusan National University,
609-735 Pusan, Korea — 5 Department of Physics, Yerevan State
University, Alex Manoogian Str. 1, 375025 Yerevan, Armenia
We study the occurrence of 2 flavour color superconductivity in compact
stars and the consequences for the configurations. The phases of 2
color superconducting (2SC) and color spin locking (CSL) and the corresponding
equations of state are investigated. Signatures for the massradius
relation for the configurations and the influence of the energy gaps
in the cooling behaviour are presented and compared with observational
candidates. • Partially supported by DAAD, Helmholtz Stiftung and Landesgraduiertenförderung
MV
Time: Wednesday 14:00–16:30 Room: A
Group Report HK 29.1 Wed 14:00 A
Test of the critical point symmetry X(5) in the A=150,180
mass regions — •A. Dewald 1 , O. Möller 1 , A. Fitzler 1 , B.
Saha 1 , D. Tonev 1 , K. Jessen 1 , J. Jolie 1 , K.O. Zell 1 , P. von
Brentano 1 , P Petkov 2 , N. Marginean 3 , M. Axiotis 3 , D. Bazzacco
4 , S Lunardi 4 , C.A. Ur 4 , R. Menegazzo 4 , and E. Farnea 4 —
1 IKP Universität zu Köln, Germany — 2 Bulg.Acad. of Science, INRNE,
Sofia, Bulgaria — 3 INFN, LN Legnaro, Italy — 4 University and INFN
Padova,Padova, Italy
We will report on investigations aiming for stringent tests of the new
critical point symmetry X(5) predictions [1] for the N=90 nuclei 154 Gd
and 156 Dy. Aside from the energy spectra, absolute transition probabilities
are crucial observables. We will compare our latest experimental values
with the X(5) calculations as well as with IBM and GCM fits. Based
on the energy spectra and relative transition probabilities, the 176−180 Os
nuclei can be considered to be very promising X(5) candidates in a new
mass region. In oder to perform stringent tests for these Os nuclei more
experimental data on absolute transition probabilities are needed. Therefore
we performed a coincidence plunger measurement with the GASP
spectrometer and the Köln plunger device. First results will be presented
and compared to X(5) and IBA calculations.
[1] F. Iachello, Phys. Rev. Lett.. 87, 52502 (2001)
Supported by the BMBF project no. 06K-167 and under the Eu Programme
contract no. HPRI–CT-1999-00083
Group Report HK 29.2 Wed 14:30 A
Evolution of the “β-Excitation” in Axially-Symmetric
Transitional Nuclei — •N. Pietralla 1,2 , C. Fransen 2 , O.
Gorbachenko 2 , and D. Mücher 2 — 1 Dept. of Physics, State Univ.
of New York at Stony Brook — 2 Inst. für Kernphysik, Univ. zu Köln
The structure of transitional nuclei has traditionally been considered
the most complicated to comprehend until recently the concept of “crit-
ical point symmetries”, applicable to situations close to the transitional
points of quantum shape phase transitions, have been introduced [1].
These analytical solutions correspond to square-well potentials in deformation
variables and serve as new benchmarks of nuclear structure. The
properties of excited J π = 0 + states are particularly sensitive for testing
the critical-point character of transitional nuclei [2]. Iachello’s X(5) solution
has been generalized to the transition path between X(5) and the
rigid rotor limit using infinite square-well potentials in the quadrupole
deformation parameter β confined within boundaries at βM > βm ≥ 0.
Analytical solutions in terms of Bessel-functions of first and second kind
were derived [3]. The new solutions are presented and compared to data.
The evolutionary trajectory of 0 + 2 states in nuclei of the N ≈ 90 transition
region is well described [3].
Supported by the NSF under PHY-0245018 and by the DFG under Pi 393/1-2.
[1] F. Iachello, Phys. Rev. Lett. 85, 3580 (2000); ibid 87, 052502 (2001);
ibid 91, 132502 (2003).
[2] R.F. Casten and N.V. Zamfir, Phys. Rev. Lett. 85, 3584 (2000); ibid
87, 052503 (2001).
[3] N. Pietralla and O. Gorbachenko, submitted for publication.
Group Report HK 29.3 Wed 15:00 A
Structure of the Te Isotopes — •N. Warr 1 , A. Dewald 1 , Ch.
Fransen 1 , P.E. Garrett 2 , S.F. Hicks 3 , J. Jolie 1 , A. Linnemann 1 ,
O. Möller 1 , J.R. Vanhoy 4 , T. von Egidy 5 , and S.W. Yates 6 for
the collaboration — 1 Institut für Kernphysik, Zülpicherstr. 77, D-50937
Köln, Germany — 2 Lawrence Livermore National Laboratory, Livermore,
California 94551, USA — 3 Dept. of Physics, University of Dallas, Irving,
TX 75062, USA — 4 Dept. of Physics, United States Naval Academy,
Annapolis, Maryland 21402, USA — 5 Physik-Department, Technische
Universität München, D-85748 Garching, Germany — 6 Dept. of Chemistry,
University of Kentucky, Lexington, KY 40506, USA

Nuclear Physics Wednesday
The level structures of several Te isotopes have been examined utilizing
γ-ray spectroscopy following the (α, 2nγ) reaction and the In β −
decay. Excitation functions, γγ coincidences and angular distributions
were measured. Spectroscopic information, e.g. spins, branching ratios
and multipole mixing ratios, was obtained for many new levels below
4.5 MeV in excitation energy. The level schemes were examined from
the viewpoint of an anharmonic vibrator model, the general collective
model, the particle-core coupling model and IBM-based intruder models.
Particular aspects of the level sequence can be reproduced by each
of these models, but the agreement with transition rate data is modest.
New absolute B(E2) values were obtained for the light Te isotopes 114 Te
and 120 Te, which show deviations from the anharmonic vibrator values
contrasting to what can be deduced from energies and B(E2) ratios alone.
HK 29.4 Wed 15:30 A
Lifetimes of Low-Spin States of 93 Nb and 94 Zr from Nuclear Resonance
Fluorescence — •A. Chyzh 1 , C. Fransen 1 , U. Kneissl 2 ,
C. Kohstall 2 , A. Linnemann 1 , D. Mücher 1 , N. Pietralla 1,3 ,
H.H. Pitz 2 , M. Scheck 2 , C. Scholl 1 , F. Stedile 2 , P. von Brentano
1 , H. von Garrel 2 , S. Walter 2 und V. Werner 1 — 1 Inst. für
Kernphysik, Universität zu Köln — 2 Inst. für Strahlenphysik, Universität
Stuttgart — 3 Dept. of Physics, State Univ. of New York at Stony Brook
Short-lived low-spin states of vibrational nuclei in the A ≈ 90 mass region
have recently received a great deal of attention due to evidences [1,2]
for pronounced structures with proton-neutron mixed-symmetry character.
Data on nuclei at the Z = 40 proton sub-shell closure are particularly
important for understanding the evolution of their collectivity because of
the partial decoupling of proton- and neutron-valence shells. For tracing
the evolution of mixed-symmetry states in this mass region knowledge
about 93 Nb and 94 Zr is desirable. Gamma-ray spectroscopy of Nuclear
Resonance Fluorescence (NRF) has been a powerful part of the earlier
discoveries. We have performed NRF experiments at the Stuttgart Dynamitron
accelerator on 93 Nb (photon endpoint energy at 2.7 MeV)
and 94 Zr (endpoints at 2.7 and 4.1 MeV). Several short-lived dipole and
quadrupole excitations were observed. Level lifetimes, branching ratios
and γ-decay matrix elements will be presented and discussed.
Supported by the DFG under Kn 154/31 and Pi 393/1-2, and by the NSF under
PHY-0245018.
[1] N. Pietralla et al., Phys. Rev. Lett. 81 1303 (1999).
[2] V. Werner et al., Phys. Lett. B550 140 (2002).
HK 29.5 Wed 15:45 A
Lifetime Measurements for Dipole Bands in 141 Eu and 142 Gd
with EUROBALL — •R.M. Lieder 1 , E.O. Podsvirova 1,2 ,
A.A. Pasternak 1,2 , W. Gast 1 , H.M. Jäger 1 , T. Venkova 1,3 ,
S. Chmel 4 , A. Dewald 5 , D. Bazzacco 6 , E. Farnea 6 , R.
Menegazzo 6 , S. Lunardi 6 , G. de Angelis 7 , D.R. Napoli 7 ,
A. Gadea 7 , G. Duchêne 8 , W. Urban 9 , T. Morek 9 , and T.
Rza¸ca-Urban 9 — 1 IKP, FZ Jülich, D-52425 Jülich — 2 A.F. Ioffe
PTI, RU-194021 St. Petersburg — 3 INRNE, BAS, BG-1784 Sofia —
4 HISKP, Univ. Bonn, D-53115 Bonn — 5 IKP, Univ. Köln, D-50937
Köln — 6 INFN, Sezione di Padova, I-35131 Padova — 7 INFN, LNL,
I-35020 Legnaro — 8 IReS, F-67037 Strasbourg — 9 IEP, Univ. Warsaw,
PL-00-681 Warsaw
Lifetimes in 141 Eu and 142 Gd have been measured in a DSAM experiment
with EUROBALL IV at IReS Strasbourg using the 114 Sn( 32 S,ypxn)
reaction at a beam energy of 160 MeV. As target a selfsupporting metallic
114 Sn foil of 8 mg/cm 2 thickness has been used. The initial recoil velocity
was v/c = 2.2%. Lifetimes have been deduced for dipole bands in 141 Eu
and 142Gd. In total 26 values were obtained. Two of the dipole bands in
142 2 Gd are considered to have πh11/2 ⊗νh −2
11/2 and πh1 11/2⊗πg−1 7/2νh−2 11/2 configurations,
respectively, and to experience band crossings. The dipole
bands in 141Eu may result from the former by subtraction of an h11/2
proton. The deduced B(M1) and B(E2) values are generally well reproduced
in the framework of the tilted axis cranking model. The results
indicate that these bands can be considered as magnetic rotational bands.
The work was partly supported by the German-Russian WTZ contract
RUS 99/191 and by the EU contract HPRI-CT-1999-00078.
HK 29.6 Wed 16:00 A
Complex nuclear-structure phenomena revealed from the
nuclide production in fragmentation reactions — •Maria
Valentina Ricciardi 1 , Anatoly V. Ignatyuk 2 , Aleksandra
Kelic 1 , Paolo Napolitani 1 , Fanny Rejmund 3 , Karl-Heinz
Schmidt 1 , and Orlin Yordanov 1 — 1 GSI, Planckstr. 1, 64291
Darmstadt, Germany — 2 IPPE, Bondarenko Squ. 1, 249020 Obninsk,
Russia — 3 IPN, 91406 Orsay, France
We report on a fine structure, manifested as an odd-even effect, observed
in the formation cross sections of light residual nuclei produced
from the projectile fragmentation of 1 A GeV 238 U nuclei in a titanium
target at GSI. The structure was analysed for cuts along different values
of N-Z, revealing a very complex behaviour. In contrast to the prominent
structural features found in nuclear fission and in transfer reactions,
this structure seems to be insensitive to the excitation energy induced
in the reaction. We suggest that the structure is created at the end of
the evaporation process due to structural effects in nuclear binding and
in the nuclear level density. The vanishing of the even-odd staggering
for heavy nuclei is explained by gamma emission. Finally we discuss the
peculiarity of the N=Z chain of residues.
HK 29.7 Wed 16:15 A
Investigations of high-spin states in 73,74,75 Se — •O. Thelen 1 , J.
Eberth 1 , D.G. Sarantites 2 , M. Devlin 2 , T. Steinhardt 1 , and A.
Fitzler 1 — 1 Institute for nuclear physics, University of Cologne, Germany
— 2 Department of Chemistry, Washington University, St. Louis,
MO, USA
High-spin states of the Selenium-Isotopes have been populated by the
reaction 30 Si( 48 Ca, xn) 73,74,75 Se at a beam energy of 165MeV. The experiment
was performed at Argonne National Laboratory, USA using
the GAMMASPHERE γ-spectrometer with the MICROBALL charged
particle-spectrometer. Mainly high-spin band structures were extended
by analysis of four dimensional coincidence-cubes. Spin asignments have
been derived from DCO analysis.
The two strongly coupled negative parity bands in 73 Se were extended
up to 45/2¯h and 43/2¯h with excitation energies up to 12.6 MeV.
The positive parity ground state band in 73 Se was observed up to a
tentative spin of 41/2¯h and energy of 9.9 MeV. For 74 Se all previously
known band structures have been extended to spin 30 and excitation energy
of 23.3 MeV. A large variety of shape coexistence effects have been
investigated.
6 known and 1 new band in 75 Se have been investigated. Tentative
spins up to 51/2¯h for the π = + bands and 37/2¯h for the π = − above
the band crossing have been observed.
The band structures will be interpreted in the framework of Cranked
Shell Model calculations.
HK 30 Electromagnetic and Hadronic Probes V
Time: Wednesday 14:00–16:30 Room: B
Group Report HK 30.1 Wed 14:00 B
Spinobservables in Proton-Proton Elastic Scattering — •Heiko
Rohdjeß for the EDDA collaboration — Helmholtz-Institut für
Strahlen- und Kernphysik, Universität Bonn
The EDDA experiment at the COSY-accelerator in Jülich has measured
analyzing powers and spin-correlation parameters at energies 0.5-
2.5 GeV and c.m. scattering angles 30 0 -90 0 . Data was acquired with the
EDDA detector and a polarized atomic-beam target internal to the unpolarized
or polarized proton beam of COSY. Final data will be shown
and the implication on our knowledge of elastic scattering, like phaseshifts,
amplitudes and models of the nucleon-nucleon interaction, will be
discussed. This work is supported by the BMBF and FZ-Jülich.
HK 30.2 Wed 14:30 B
Nucleon-resonance decay by the K 0 Σ + channel — •ralph
castelijns for the CBELSA/TAPS collaboration — KVI, Groningen,
the Netherlands
At the tagged photon beam of the ELSA electron synchrotron at the
Univ. of Bonn/Germany the Crystal Barrel photon spectrometer and
TAPS have been combined to provide a 4π detector for multi-neutral
final states from photonuclear reactions. The TAPS array covers the forward
polar angle region and thus complements the Crystal Barrel with a
fast and highly granular detector for photons, protons and neutrons. In
addition, it offers selective triggering options for efficient data taking.
In a series of experiments on single and multiple neutron meson emis-

Nuclear Physics Wednesday
sion we have concentrated on the hyperon production off protons and
deuterons, and in particular on the K 0 Σ + channel. High-quality excitation
function, angular distributions and polarization measurements near
the KΣ threshold were obtained. First preliminary results on hyperon
production will be presented. For comparison, the published results of
SAPHIR data [1] on hyperon production will be shown.
[1] S. Görs et al., Phys. Lett. B 464 (1999) 331
HK 30.3 Wed 14:45 B
Production of Antikaons in p + Au and p + C Collisions ∗ —
•Frank Dohrmann for the KaoS collaboration — Forschungszentrum
Rossendorf
The Kaon Spectrometer experiment KaoS at GSI Darmstadt has performed
the first systematic study of the production of antikaons K − in
p + Au and p + C collisions. Kaons K + and pions π ± have also been
measured. The two-fold differential production cross section has been
determined at proton beam energies of 1.6, 2.5, 3.5 GeV over a large
range in angle 32 ◦ < θpolar < 64 ◦ as well as momentum 0.3 GeV/c < p <
1.1 GeV/c. The differential cross sections have been compared to transport
calculations [1], taking into account the NY production channel for
K − and an in-medium K − N potential. For A + A collisions, data on
the production of π ± and K ± have been interpreted as showing strong
medium effects. The p + A presented here are compared with data from
p + p and A + A collisions, studying the influence of the nuclear medium
on the production of antikaons and kaons.
∗ supported by BMBF, GSI and FZR
[1] H. W. Barz and L. Naumann, Phys. Rev. C 68 (2003) 041901
HK 30.4 Wed 15:00 B
New results on the pd -¿ 3He eta production from threshold
up to Q=40 MeV — •Heinz-Hermann Adam for the COSY-11 collaboration
— Universitaet Muenster, Institut fuer Kernphysik, Wilhelm-
Klemm-Str. 10, 48149 Muenster
Close to threshold data on the pd-¿He3 eta reaction are of great interest
to study the strong attractive eta-nucleus interaction at low energies,
which might be a signal for the existence of quasi-bound etanucleus
states. We present new results on the eta-production in protondeuteron
collisions performed using the COSY-11 facility at COSY-
Juelich (FZJ). With five new data points measured at excess energies
between Q=5.2 and Q=40.6 MeV, we are able to close the gap between
measurements carried out at SPES-II (SATURNE) up to an excess energy
of 7 MeV, showing an almost isotropic angular distribution, and results
from WASA/PROMICE (CELSIUS) and GEM (COSY) above excess energies
of 20 MeV, yielding non-isotropic angular distributions. Besides
presentation of total and differential cross sections, we also discuss over
the range of the five studied beam momenta the change in the angular distributions
from an almost isotropic (S-wave) emission at low Q-values to
contributions from higher partial waves leading to a non-isotropic angular
distribution at the higher Q-values. Finally a comparison of the data
with predictions of theoretical models to describe the underlying reaction
mechanism will be given. Supported by Forschungszentrum Juelich.
HK 30.5 Wed 15:15 B
Investigation of the Deuteron Breakup �pd → ppn at High Momentum
Transfer at ANKE/COSY ∗ — •S. Yaschenko for the
ANKE collaboration — PI II, Universität Erlangen–Nürnberg, Germany
The deuteron breakup reaction pd → ppn at GeV projectile energies
in kinematics similar to backward elastic scattering pd → dp provides
a new tool to investigate the pd dynamics at high–momentum transfer.
The aim of a corresponding experimental program at the ANKE spectrometer
at COSY–Jülich is to obtain insight into systems composed of
more than two nucleons by measuring �p � d → ppn to provide a complete
set of observables. A first experiment was carried out with an unpolarized
deuterium cluster jet target at the internal COSY beam at energies
Tp = 0.6, 0.7, 0.8, 0.95, 1.35, and 1.9 GeV. Events were selected by
reconstructing the momenta of the two forward emitted protons with
small excitation energy Epp < 3 MeV. The differential cross section of
the breakup reaction, averaged over cm polar angles from 0 ◦ to 8 ◦ of
the total momentum of the pp pairs, has been obtained. The results are
compared with calculations based on a theoretical model previously applied
to the pd → dp process. Recently, measurements at Tp = 1.1, 1.4,
and 2.0 GeV with an unpolarized proton beam and at Tp = 0.5 and
0.8 GeV with a polarized beam were carried out. The current status of
data analysis, the first results of measurements of the vector analyzing
power at 0.5 and 0.8 GeV and a comparison with theoretical predictions
are presented. ∗ supported by FZ-Jülich, BMBF, WTZ.
HK 30.6 Wed 15:30 B
Selection rules in η photoproduction — •Olivia Bartholomy
for the CB–ELSA collaboration — Helmholtz–Institut für Strahlen– und
Kernphysik, Nußallee 14–16, 53111 Bonn, Germany
The study of photoproduction reactions off nucleons can help to clarify
not yet resolved questions in baryon spectroscopy. Data of the first
experimental phase of the CB–ELSA experiment was analyzed with respect
to the reaction γp → pη. Results [1] on differential cross sections
covering photon energies between 0.75 and 3.0 GeV, and thus the whole
resonance region, for almost the full solid angle will be presented.
The experimental data served as input for a coupled–channel analysis
along with the results obtained for the channel γp → pπ0 and data
from TAPS and GRAAL. The conclusions that can be drawn from
the partial–wave analysis reproduce previous experimental findings and
known resonance contributions. Along with the states known to couple
− at
to Nγ and Nη, evidence was found for a new resonance of JP = 5
2
(W, Γ) = ((2079 ± 40) MeV, (368 +100
−50 ) MeV). The results on masses,
widths, and couplings obtained from the analysis will be discussed.
We observe that the contributing states follow a noticeable pattern:
For each given orbital angular momentum from the quark model L =
1, 2, and 3, the states with Spin S = 1 and lowest total angular mo-
2
mentum J = L − S are predominantly excited in the intermediate state
of γp → pη.
Supported by DFG.
[1] V. Credé, O. Bartholomy et al., hep-ex/0311045, submitted to
Phys. Rev. Lett.
HK 30.7 Wed 15:45 B
η photoproduction on nuclei — •Th. Mertens for the
CBELSA/TAPS collaboration — University of Basel, 4056 Basel,
Klingelbergstr. 82, Switzerland
The in-medium behavior of nucleon resonances and mesons is a hotly
debated topic. Measurements of total photoabsorption from nuclei show
a strong suppresion of the peak corresponding to the excitation of the
P11(1440) , D13(1520) and S11(1535) resonance.
Photoproduction of η mesons in this energy region is completely dominated
by the excitation of the S11(1535) resonance and this allows a
detailed study of this state. Previous measurements of quasifree η photoproduction
found no unexplained suppression of the reaction although
strong FSI effects have been seen.
However, those experiments did not cover the full excitation range of
the resonance so that no final conclusion about in-medium effects on
position and width could be drawn.
The present experiment on 12 C , 40 Ca , 93 Nb , Pb using the Crystall
Barrel and Taps detector at the ELSA accelerator will overcome the
problem with data up to 2.6 GeV. Furthermore, the investigation of the
π 0 η final state may allow for the first time the study of in-medium modification
of the scalar meson a0(980) . First preliminary results will be
discussed.
HK 30.8 Wed 16:00 B
Measurements on the Reaction pn → dη near threshold —
•Norbert Lang, Alfons Khoukaz, Timo Mersmann, and Ricarda
Menke for the ANKE collaboration — Westfälische Wilhelms-
Universität, Institut für Kernphysik, Münster, Germany
Measurements on near threshold η-production in pn-collisions are of
great interest with respect to the still not well known strong η-N interaction
and the possibility for the existence of quasi-bound η-nucleus
states.
The topic of this talk is the investigation of the reaction pd →
pspectatordη performed at two incident proton beam momenta of p = 2.055
GeV/c and 2.095 GeV/c. The data have been obtained using the ANKE
spectrometer at COSY-Jülich with a deuterium cluster target. A position
sensitive silicon telescope, allowed for the identification of slow spectator
protons.
Using spectator kinematics it is possible to measure the reaction
pd → pspectatordη as a substitute for the η-production on a free neutron
in the channel pn → dη. The reconstruction of the spectator-proton
momentum allows the determination of the Q-value, which is influenced
by the Fermi momentum of the nucleons in the deuteron. The eventby-event
reconstruction of the excess energy Q allows one to scan the
excitation function over a broad interval using only one fixed beam momentum.
The new ANKE data will be discussed and compared with existing
data.
This work is supported by the Forschungszentrum Jülich.

Nuclear Physics Wednesday
HK 30.9 Wed 16:15 B
Eta meson production in the reaction dd→ 4 He η † —
•Aleksandra Wrońska for the ANKE collaboration — IKP, FZ
Jülich, Germany — Jagiellonian University, Cracow, Poland
The issue of η-nucleus quasi-bound states has drawn a lot of attention
in recent years. A steep rise of the η-production amplitudes in the
pd → 3 Heη and dd → 4 Heη processes is believed to be an indication into
this direction. However, an advanced analysis aiming at the extraction
of the η-nucleus s-wave scattering length requires precise information on
angular distributions. For the pd → 3 Heη reaction, though some differential
cross sections for higher Q values (Q>21 MeV) are available, there
HK 31 Instrumentation and Applications IV
are still inconsistencies between various data sets on the total cross section
close to threshold. Angular distributions for the 4 He−η system have
never been measured. Knowlegde of the development of higher partial
waves would also cast some light on the η-production mechanism. ηmeson
production with 4 He in the final state in dd collisions has been a
part of the experimental program at the ANKE facility of COSY-Jülich.
Measurements of total and differential cross sections at four excess energies
have been performed. In this talk the experimental technique as
well as the current status of the data analysis are presented. † supported
by FZ Jülich and EU
Time: Wednesday 14:00–16:30 Room: C
Group Report HK 31.1 Wed 14:00 C
The WASA detector at COSY-Jülich — M. Büscher 1 , H.
Calen 2 , C. Ekström 2 , A. Gillitzer 1 , D. Grzonka 1 , C. Hanhart
1 , •V. Hejny 1 , B. Höistad 3 , K. Kilian 1 , S. Krewald 1 , S.
Kullander 2 , R. Maier 1 , W.v. Oers 4 , J. Ritman 1,5 , H. Ströher 1 ,
and M. Wolke 1,2 for the WASA collaboration — 1 IKP, FZ-Jülich
— 2 TSL, Uppsala, Sweden — 3 ISV, Uppsala, Sweden — 4 Univ. of
Manitoba, Winnipeg, Canada — 5 2. Phys. Inst., Univ. Gießen
The WASA (“Wide Angle Shower Apparatus”) detector, currently installed
at the CELSIUS storage ring of TSL, has a close to 4π angular
acceptance for charged and neutral particles from proton induced interactions
in a hydrogen or deuterium frozen pellet target.
After the end of the experimental program at CELSIUS in summer
2005, the measurements with WASA will be continued at COSY-Jülich
where a photon detector is missing up to now. COSY offers higher beam
momenta (up to 3.65 GeV/c as compared to 2.10 GeV/c at CELSIUS)
with polarized and phase-space cooled proton and deuteron beams. Almost
any final state of pN, pd and dd reactions can be detected, resulting
in a major expansion of the experimental potential both of WASA and
COSY. Significant progress in the understanding of strong interaction
processes, hadronic systems and their decays as well as the underlying
symmetries can be expected from the data to be obtained with WASA at
COSY. The status of WASA relocation to COSY will be presented and
the anticipated experimental program will be discussed.
HK 31.2 Wed 14:30 C
Optimisation of momentum determination in the HADES experiment
— •Anar Rustamov 1 , Hejdar Agakichiev 1 , Vladimir
Pechinov 1 , Herbert Stroebele 2 , Joachim Stroth 1,2 , and Christian
Sturm 1 — 1 Gesellschaft fuer Schwerionenforschung, Darmstadt —
2 Universitaet Frankfurt
The aim of the HADES experiment is the measurement of e + -e − pairs
with an invariant mass resolution of 1 per cent. To achieve this goal
precise momentum determination is essential. Our method to derive
particle momenta from position and direction measurements before and
behind a magnetic field is based on an iterative spline fitting procedure.
First results from an incomplete analysis of elastic pp interactions yield a
resolution in the total detected energy of 4 per cent. The momentum resolution
for simulated electrons without multiple scattering ranges from
0.4% to 1% in the momentum region from 100 to 1000 MeV/c, if a position
resolution of 100 microns in radial and 200 microns in tangential
direction is assumed.
HK 31.3 Wed 14:45 C
Performances of RPC-prototypes for the FOPI-TOF-Upgrade
— •everard cordier for the FOPI collaboration, supported by BMBF
(06HD154) and GSI (HD-HER). collaboration — Physikalisches Institut
der Universität Heidelberg, 69120 Heidelberg, Germany.
The time of flight system of the FOPI detector at GSI is planned to
be upgraded to a RPC based solution aiming at a time resolution better
than 100 ps and a granularity of more than 500 in independant cells over
a surface of 6m 2 . RPC prototypes with a strip line readout have been developped
as well as the necessary electronics. Results will be presented
on time resolution and efficiency as obtained from measurements with
pulsers, γ-sources, minimum ionising particles and from beam tests.
HK 31.4 Wed 15:00 C
RESULTS OF COSMIC-RAY TRACKING WITH A NEW
STRAW DETECTOR — •Aziz Ucar 1 , Kurt Kilian 1 , Peter
Wintz 1 , Robert Nellen 1 , Thomas Sefzick 1 , Vlademir Kozlov
2,1 , Sergey Orfanitskiy 2,1 , and Eduard Roderburg 1 for the
COSY-TOF collaboration — 1 Institute of Nucleer Physics, Research
Center Juelich, Germany — 2 Moskow State University
A new straw tube tracking detector is under construction. It will be
used inside the vacuum tank of the COSY time of flight (TOF) detector
system.
As the mechanical stability is provided by gas overpressure, there is no
need of massive fixing or clamping inside the surrounding frame which
has very low mass. The detector will consist of more than 3000 straws
with 1cm diameter and 30 micron Mylar wall thickness. The active volume
and area of the tracker are 0.3 m 3 and 1m 2 . The final tracker has a
total weight less than 15 kg including surrounding frames.
Using straws arranged in double plane for tests, cosmic-ray tracks are
reconstructed. First spatial resolution and efficiency of the straws are
determined.
HK 31.5 Wed 15:15 C
Proton Pion identification with a scintillating fiber detector
— • Wolfgang Sommer, Michael Düren, Matthias Hartig,
Matthias Hoek, Tibor Keri, Shaojun Lu, Lukas Rubacek,
Björn Seitz, and Hasko Stenzel for the HERMES collaboration
— II. Physikalisches Institut, JLU-Giessen, 35392 Giessen
The Hermes Recoil Project aims at measuring recoil protons produced
in DVCS and Bethe-Heitler processes with transverse momenta between
0.1 GeV/c to 1.4 GeV/c. One part of the detector, the scintillating fiber
detector was designed to track and identify protons between 0.3 GeV/c
and 0.8 GeV/c. The dominant source of background for protons originating
from DVCS are pions resulting predominantly from ∆-decays.
Scintillating fiber detectors, which are well known as tracking devices,
are used in our detector to separate protons and pions in the specified
momentum range. This is achieved by measuring the deposited energy
and comparing it to the calculated response for protons and pions. The
applied method is a modification of the Log-Likelihood method used in
the current Hermes experiment. The separation of protons and pions
was tested during an experiment at GSI Darmstadt using a mixed proton/pion
beam.
HK 31.6 Wed 15:30 C
Cold Silicon Detectors in Compass [†] — •Matthias Becker,
Anna-Maria Fuchs, Rita de Masi, Jan Friedrich, Igor
Konorov, Stephan Paul, and Michael Wiesmann — TU
Muenchen, Physik-Department E18, 85748 Garching
The Compass experiment at Cern, Sps carries out investigations
of the structure and spectroscopy on the nucleon with both muon and
hadron beams of high intensity.
For track reconstruction with high spatial resolution in the target region,
silicon microstrip detectors are used directly in the beam.
The damage caused by the hadron beam is so high that the detectors
show a noticeable breakdown of their performance already after one year.
Therefore they are operated at 130 K in order to exploit the so-called
Lazarus effect. Thus their lifetime is extended by a factor of 5.
We report on the construction and commissioning of the liquid nitrogen
cooled silicon detectors and show first results of performance tests in
the 2003 beamtime. Plans for 2004 are presented to operate six detectors

Nuclear Physics Wednesday
with an automatic cooling system.
[†] This work is supported by the BMBF and the Maier-Leibnitz-Labor
of the Universities of Munich
HK 31.7 Wed 15:45 C
Development of a scintillating fibre hodoscope with multi-anode
photomultiplier read-out for use in a kaon spectrometer —
•Carlos Ayerbe and Patrick Achenbach for the A1 collaboration
— Inst. für Kernphysik, Univ. Mainz, 55099 Mainz
Two compact and fast hodoscopes based on scintillating fibres with
multi-anode photomultiplier read-out have been constructed. The system
is being developed to accommodate for the high count rates expected
in the focal plane of a kaon spectrometer at the spectrometer facility at
MAMI. The fibres are of type Kuraray SCSF-78 with double cladding
and 0.83mm cross-section, of which 128 are closely packed in 2 double
layers and coupled to a Hamamatsu 32 channel linear array photomultiplier.
Results on light yield, spatial and timing resolutions, cross-talk
between neighbouring pixels and efficiencies are presented. The concept
for a future system with 4096 fibres to be read out with CATCH front-end
modules will be discussed briefly.
Work supported by Deutsche Forschungsgemeinschaft (SFB 443).
HK 31.8 Wed 16:00 C
Electron beamline design of the A4 Compton backscattering
polarimeter — •Jeong Han Lee for the A4 collaboration — Institut
für Kernphysik — Universität Mainz, D-55099 Mainz, Germany
HK 32 Theory V
Using the elastic scattering of longitudinally polarized electrons on an
unpolarized proton target, the A4-collaboration of the Dept. of Nuclear
Physics, University of Mainz, measures the parity-violating asymmetry.
For a good measurement of the polarization of the electron beam, detailed
information about beam is required. For the design of the beamline, the
TRANSPORT program and general plot software have been used. Now
the connecting TRANSPORT and ROOT software is in progress.
This talk will present the result of beamline design and progress.
HK 31.9 Wed 16:15 C
Commissioning of a Natrium-Sodium-Detector for the A4
Compton backscattering polarimeter — •Mario Sikora for
the A4 collaboration — Institut für Kernphysik — Universität Mainz,
D-55099 Mainz
The A4 collaboration in the institute of nuclear physics in Mainz determines
contributions of strange quarks to the form factors of the nucleon.
The experimental setup includes a comtpon-polarimeter which is used to
measure the polarisation of the incident electron beam. Backscattered
photons of the compton-polarimeter deposit their energy in natriumsodium
crystals. The crystals are read out by photomultipliers and an
appropriate data acquisition.
This talk will present results from the calibration with different radioactive
sources and cosmic rays and will present results for the expected
behaviour estimated by simulation.
Time: Wednesday 14:00–16:30 Room: D
Group Report HK 32.1 Wed 14:00 D
Relativistic Quark Model for Light and Strange Baryons —
•Robert Ferdinand Wagenbrunn, Katharina Berger, Leonid
Glozman, Thomas Melde, Willibald Plessas, and Bianka
Sengl — Institut für Theoretische Physik, Karl-Franzens-Universität
Graz, Universitätsplatz 5, A-8010 Graz
We present new results for baryon properties in a relativistic constituent
quark model. The dynamics of the model relies on Goldstoneboson
exchange which is motivated by the spontaneous breaking of chiral
symmetry of QCD at low energies. With this dynamics the spectra of
all light and strange baryons can be reproduced in accordance with experiment
[1]. The three-quark Hamiltonian of the model represents an
invariant mass operator in relativistic quantum mechanics and it allows
for a Poincaré-invariant treatment of hadronic reactions. We have calculated
electromagnetic and axial form factors of the nucleons in the point
and instant forms [2]. Recently we have extended the approach also to
calculating pion-decay widths of N and ∆ resonances [3]. In all instances
one observes large relativistic effects, what puts considerable doubts on
any nonrelativistic quark model.
[1] L.Ya. Glozman et al., Phys. Rev. D 58, 094030 (1998).
[2] R.F. Wagenbrunn et al., Phys. Lett. B 511, 33 (2001); L.Ya. Glozman
et al., Phys. Lett. B 516, 183 (2001); S. Boffi et al., Eur. Phys. J.
A 14, 17 (2002).
[3] T. Melde et al., Few-Body Syst. Suppl. 14, 37 (2003).
Group Report HK 32.2 Wed 14:30 D
Chiral dynamics of baryons as bound states of constituent
quarks — •Valery Lyubovitskij, Thomas Gutsche, Amand
Faessler, Kem Pumsa-ard, and Ping Wang — Institut für Theoretische
Physik, Universität Tübingen, Auf der Morgenstelle 14, D-72076
Tübingen, Germany
We developed a manifestly Lorentz invariant chiral quark model for the
study of baryons as bound states of constituent quarks in an extention of
our previous approach [1,2]. The approach is based on a non-linear chirally
symmetric Lagrangian, which involves effective degrees of freedom
- constituent quarks and the chiral (meson) fields. In the first step, this
Lagrangian can be used to perform a dressing of the constituent quarks
by a cloud of light pseudoscalar mesons and other heavy states using
the calculational technique developed by Becher and Leutwyler [3]. We
calculate the dressed transition operators with a proper chiral expansion
which are relevant for the interaction of quarks with external fields in
the presence of a virtual meson cloud. Next, these operators are used in
the calculation of baryon matrix elements using an effective Lagrangian
describing the coupling of a baryon field to the interpolating three-quark
current [2].
[1] V. E. Lyubovitskij, Th. Gutsche and A. Faessler, Phys. Rev. C 64
(2001) 065203; V. E. Lyubovitskij et al., Phys. Rev. C 65 (2002) 02520;
C 66 (2002) 055204; C 68 (2003) 015205; Phys. Lett. B 520 (2001) 204
[2] A. Faessler et al., Phys. Lett. B 518 (2001) 55
[3] T. Becher and H. Leutwyler, Eur. Phys. J. C 9 (1999) 643
Group Report HK 32.3 Wed 15:00 D
The structure of the nucleon in relativistic baryon chiral perturbation
theory — •Stefan Scherer, Thomas Fuchs, Matthias
R. Schindler, and Jambul Gegelia — Institut für Kernphysik, Johannes
Gutenberg-Universität, Mainz
The implementation of a successful effective field theory program requires
two main ingredients, namely: (a) a knowledge of the most general
effective Lagrangian and (b) an expansion scheme for observables in
terms of a consistent power counting method. We discuss a renormalization
scheme for manifestly Lorentz-invariant baryon chiral perturbation
theory which provides a simple and consistent power counting for
renormalized diagrams. The method involves finite subtractions of dimensionally
regularized diagrams beyond the standard modified minimal
subtraction scheme of chiral perturbation theory to remove contributions
violating the power counting. This is achieved by a suitable renormalization
of the parameters of the most general effective Lagrangian. As
applications we discuss the mass of the nucleon, the σ term, and the
scalar and electromagnetic form factors. Our approach may be used in
an iterative procedure to renormalize higher-order loop diagrams and also
allows for implementing a consistent power counting when vector (and
axial-vector) mesons are explicitly included.
HK 32.4 Wed 15:30 D
Lifetime of Kaonium — •Siegfried Krewald 1 , Richard Lemmer
2 , and Felix Sassen 1 — 1 Institut fuer Kernphysik, Forschungszentrum,
52425 Juelich — 2 Nuclear and Particle Theory Group, University
of Witwatersrand, Johannesburg, WITS 2050, South Africa
We predict the lifetime of the hadronic atom kaonium assuming
a mixing with the scalar mesons f0(980) and a0(980). The structure
of those mesons has been controversial for many years. If one
assumes the scalar mesons to be quasibound states of a Kaon and
an Antikaon a non-relativistic effective field theory approach (Gasser,
Lyubovitsij,Rusetsky,Gall, PRD64:0160008(2001))is appropriate. With
this in mind we start from the Juelich meson exchange model, but replace
the potentials by a phase-equivalent Bargmann potential that gives rise

Nuclear Physics Wednesday
to the same scattering length and effective range, and allows to construct
the Jost functions explicitly so that both the scattering and bound state
properties of the Kaon-Antikaon system are determined without further
approximation. Full details can be found in ref.(hep-ph/0307288).
The full Juelich meson exchange model contains a hard component
in the meson wavefunctions in addition to the Kaon-Antikaon structure.
The presence of the hard component reduces the lifetime of Kaonium by
a factor 3 as compared to a calculation asssuming a purely molecular
structure of the scalar mesons.
HK 32.5 Wed 15:45 D
σ Meson in the NN Interaction and in the Production Process ∗
— •M. Kaskulov, H. Clement, and E. Doroshkevich —
Physikalisches Institut, Universität Tübingen, Germany
Conventionally the scalar-isoscalar NN interaction is treated by σ (or
correlated two-pion) exchange, which is lifted on its mass shell in the
two-pion production reaction. In the Valencia model [1] the production
process in the near-threshold region proceeds nearly exclusively via the
excitation of the Roper resonance with its successive decay into ∆π and
Nσ, with the relative branching of these decay routes being adjusted to
data [2]. However, in these calculations no dynamic ππ correlations have
been taken into account for the sigma channel. In our ansatz for this
problem we include ππ rescattering in agreement with ππ phase shifts
both in σ exchange and in σ production. In the first case this leads to an
extra, repulsive, potential term, which improves the description of higher
partial waves. In the latter case we obtain a quantitative description of
the experimental differential data for the pp → ppπ + π − reaction close to
threshold without invoking explicitely excitation and decay of the Roper
resonance.
[1] L. Alvarez-Ruso et al., Nucl. Phys. A633, 519 (1998)
[2] W. Brodowski et al., PRL 88, 192301 (2002); PRC 67, 052202(R)
(2003)
∗ supported by BMBF (06 TU 201), DFG (Europ. Graduiertenkolleg)
and Landesforschungsschwerpunkt ( Quasiteilchen )
HK 33 Heavy Ions III
HK 32.6 Wed 16:00 D
A novel dispersive analysis of πK scattering — •Paul
Büttiker 1 , Sebastien Descotes-Genon 2 , and Bachir Moussallam
3 — 1 Helmholtz-Institut für Strahlen- und Kernphysik, Universität
Bonn, D-53115 Bonn — 2 Laboratoire de Physique Théorique, Université
Paris–Sud, F-91406 Orsay — 3 Institut de Physique Nucléaire, Université
Paris–Sud, F-91406 Orsay
A set of six coupled integral-equations for the S– and P–waves of the
πK scattering amplitudes is derived and analyzed, using, for the first
time, the most accurate experimental πK → πK and ππ → K ¯ K scattering
data available at E ≥ 1 GeV. Precise and unique solutions are
obtained in the range E ≤ 1 GeV. Our main result is the determination
of a narrow allowed region for the two scattering lengths a 1/2
0 and a 3/2
0 .
Present experimental data below 1 GeV are found to be in generally poor
agreement with our results. As an application of this analysis, we calculate
a set of threshold and subthreshold parameters, as well as some
low energy constants entering the calculations in the framework of Chiral
Perturbation Theory.
HK 32.7 Wed 16:15 D
The Four-Body System in EFT — •Lucas Platter —
Forschungszentrum Jülich — HISKP Bonn
The effective field theory with contact interactions provides a modelindependent
framework to compute low-energy observables to very high
precision. The errors in the calculation are intrinsically linked to the
expansion parameters of the theory and can be estimated in a straightforward
way.
Recently, the theory has been applied successfully to the three-body
system with large two-body scattering length, where a three-body force
at leading order is needed to renormalize the problem. We will discuss
the extension of this work to the four-body system within an effective
potential approach, give predictions for the binding energies of different
four-body systems, and discuss the renormalization of the four-body
problem within this framework.
Time: Wednesday 14:00–16:30 Room: E
Group Report HK 33.1 Wed 14:00 E
Isotope Mixing and Isospin Dependence of the Caloric Curve
Measured in Central 124,129 Xe+ 112,124 Sn at 100 A.MeV
and 12 C+ 112,124 Sn at 300 A.MeV Bombarding Energy —
•Arnaud Le Fèvre for the ALADIN-INDRA collaboration — GSI -
KPIII - Planckstrasse 1 - D-64291 Darmstadt
Isospin effects measured with the 4π multidetector INDRA at GSI are
presented. In a first part, four different combinations of central collisions
of 124,129 Xe+ 112,124 Sn are compared at the same bombarding energy of
100 A.MeV. The degree of isospin mixing between target and projectile is
studied using different isospin-tracer observables and isotope-yield ratios.
In a second part, thermal properties of the target spectator break-up in
the collisions 12 C+ 112,124 Sn at 300 A.MeV bombarding energy are investigated.
By extracting the thermal component in the isotope yields, using
a moving source fit method, we deduce the caloric curves corresponding
to the two different Sn isotopes.
Group Report HK 33.2 Wed 14:30 E
The ion trap facility SHIPTRAP at GSI — •Michael Block for
the SHIPTRAP collaboration — GSI, 64291 Darmstadt
The ion trap facility SHIPTRAP at GSI has been setup to enable precise
investigations of nuclear, atomic and chemical properties of elements
heavier than uranium. Therefore an ion trap system was installed behind
the SHIP separator well known for the discovery of super heavy
elements. SHIPTRAP allows for precision mass measurements, nuclear
in-trap decay spectroscopy, laser spectroscopy and ion chemical reactions
of elements produced in fusion reactions at SHIP. In order to inject the
reaction products after separation from the primary beam into the traps
their energy has to be reduced down to a few eV. This is accomplished
in a helium buffer gas cell where the high energetic ions are stopped.
The ions extracted from the cell by the gas flow through a small nozzle
are cooled and isobarically purified by a combination of a radio frequency
quadrupole buncher and a Penning trap. After preparation they
are transferred into the second Penning where precision measurements
are carried out. Purified and cooled low emittance beams can also be
extracted for downstream experiments. In the ongoing commissioning
phase all components of SHIPTRAP have been characterized in off-line
tests.In on-line experiments at Garching and at GSI this year the efficiency
of the stopping cell has been measured to be in the percent range.
This will already allow for mass measurements of ions produced at SHIP
within 2004. However, in order to access the super heavy elements that
are only produced with cross sections of nb or less the overall efficiency
has still to be improved.
HK 33.3 Wed 15:00 E
INDRA@GSI : Collective Flow in Au+Au Collisions — •Jerzy
Lukasik for the ALADIN-INDRA collaboration — GSI, Planckstr. 1,
D-64291 Darmstadt
Directed and elliptic flow in symmetric heavy ion collisions has been
studied using the 197 Au + 197 Au reactions at incident energies between
40 and 150 AMeV. The reactions have been measured with the 4π multidetector
INDRA at the GSI facility. In particular, the bombarding energy
at which the elliptic flow switches from in-plane to out-of-plane enhancement
has been determined to be clearly above 100 AMeV in good agreement
with the result obtained by the FOPI Collaboration. The new data
allows also to extend the experimental excitation function of v2 to lower
energies and to present it for isotopically resolved light species.
HK 33.4 Wed 15:15 E
Survival probabilities of superheavy nuclei with new theoretical
predictions of nuclear properties. — •A.S. Zubov 1,2 , G.G.
Adamian 2 , N.V. Antonenko 2 , S.P. Ivanova 2 , and W. Scheid 1
— 1 Institut für Theoretische Physik der Justus–Liebig–Universität, D–
35392 Giessen, Germany — 2 Joint Institute for Nuclear Research, 141980
Dubna, Russia
Using the statistical model and new theoretical predictions of nuclear
properties [1], we calculate survival probabilities of superheavy nuclei
with respect to the xn evaporation channel (x ≥ 1). The survival probabilities
are applied for obtaining evaporation residue cross sections and

Nuclear Physics Wednesday
excitation functions of isotopes of No within the dinuclear system concept.
The results are in a good agreement with available experimental
data.
[1] I. Muntian et al., Acta Phys. Pol. B34, 2073 (2003)
HK 33.5 Wed 15:30 E
Physics with exotic nuclei at the Low-Energy-Branch of
the Super-FRS — •Christoph Scheidenberger for the
Super-FRS/NUSTAR collaboration — GSI, Darmstadt
The Low-Energy-Branch of the Super-FRS will provide exotic nuclear
beams for experiments with slowed-down beams (5...200MeV/u), stopped
beams, and ISOL-type beams (10...100keV) of all elements. Equipped
with quite versatile instrumentation, it will provide ideal conditions for
a broad experimental physics programme. Examples will be presented:
high-resolution gamma-ray spectroscopy using the Advanced GAmma-
Tracking Array AGATA for the study of Coulomb excitation close to
the barrier and nucleon transfer, deep-inelastic and compound reactions.
Decay spectroscopy with stopped beams including alpha-, beta- and
isomer-spectroscopy of nuclei implanted in thin (active) stoppers will
benefit from small range straggling and thus allow for new opportunities
in x-ray and electron spectroscopy. ISOL-type beams of all elements,
in particular including refractory elements, will be available due to the
use of a new hybrid system (in-flight separation, energy focusing, and
stopping in a gas cell). The full experimental spectrum of modern lowenergy
radioactive-beam facilities, such as Penning traps, charge breeders
(EBIS), electron-beam ion traps (EBIT), LASER spectroscopy will be
used to study neutron rich nuclei. Especially the availability of highlycharged
ions in traps will allow for exciting new experiments, such as the
study of bound-state beta decay and electron spectroscopy, which can
reveal the missing screening for bare nuclei.
HK 33.6 Wed 15:45 E
Investigation of N/Z of the heavy fragmentation products - the
isospin thermometer method — •D. Henzlova 1 , M.V. Ricciardi
1 , J. Benlliure 2 , A.S. Botvina 1 , T. Enqvist 1 , A. Kelic 1 , P.
Napolitani 1 , J. Pereira 2 , and K.-H. Schmidt 1 — 1 GSI-Darmstadt,
Germany — 2 Uni. Santiago de Compostela, Spain
Investigations of the isotopic distributions of the fragmentation
residues received an extensive interest in the past decades as they provide
a deeper insight into the properties of nuclear matter. Their previous
studies were limited to rather light fragments due to the low experimental
mass resolution achieved and since the theoretical interpretations of
heavy fragments are complicated by the stronger influence of the evaporation
process. The isotopic distributions and mean N/Z ratios of the heavy
fragments, measured in series of experiments on the high-resolution magnetic
spectrometer (FRS) at GSI, Darmstadt, including the results of a
recent experiment for the system 136Xe+Pb at 1AGeV will be presented.
The deviation of the final mean N/Z from the universal evaporation corridor,
observed for the neutron-rich fragmenting system, is confirmed in
this dedicated experiment. The data are investigated with the use of
the isospin-thermometer method in order to extract the freeze-out tem-
HK 34 Nuclear and Particle Astrophysics II
perature after the break-up stage from the reduction of the N/Z in the
evaporation process.
HK 33.7 Wed 16:00 E
Angular Anisotropy in Binary and Ternary Fission of 238 U
Induced by MeV Neutrons — •S. Dilger 1 , W. Rochow 1 , F.
Gönnenwein 1 , and M. Mutterer 2 — 1 Physikalisches Institut, U
Tübingen, Germany — 2 IKP, TU Darmstadt, Germany
Most theories of ternary fission predict the ternary particles to be
formed in the final stage of the fission process, i.e. at scission. A way
to confirm this assumption is to investigate the angular distribution of
fission fragments. Since this distribution is determined near the saddle
point of fission, the angular distributions of ternary and binary fission
should not differ. Parity violating angular asymmetries of fragments from
fission reactions induced by cold polarised neutrons have been compared
in recent years for binary and ternary fission. No difference in the asymmetries
could be detected. Parity conserving angular anisotropies were
studied even since the early seventies. Results, however, were conflicting.
Experiments were also performed at the accelerator at the University of
Tübingen. For the reaction 238 U(n,f) with neutrons at 1.6 MeV, an unexpected
ratio of A3/A2 = 1.18 ± 0.08 for the anisotropies for ternary
and binary fission, A3 and A2 respectively, was obtained. To clarify the
situation, a reinvestigation with an improved experimental approach was
carried out. Measurements were performed at two different neutron energies.
The ratios of the angular anisotropy for ternary and binary fission
are found to be A3/A2 = 1.06±0.10 and 0.98±0.11 for En = 1.6 and 1.8
MeV, respectively. Both results are compatible with A3/A2 = 1. Hence,
the conclusion is drawn that ternary particles are not yet detectable at
the saddle point. They are formed in the very last stage at scission.
HK 33.8 Wed 16:15 E
T-odd asymmetry in ternary fission of 239Pu(n,f) — •Friedrich
Goennenwein 1 , Alexei Gagarski 2 , Guenadi Petrov 2 , Peter
Jesinger 1 , Manfred Mutterer 3 , and Valeri Nesvishevski 4 —
1 PIT, U Tuebingen, Germany — 2 PNPI, Gatchina, Russia — 3 IKP, TU
Darmstadt, Germany — 4 ILL, France
In ternary fission induced by cold polarised neutrons a T-odd asymmetry
has recently been observed. In these experiments a triple correlation
is measured between the neutron spin pointing parallel to the beam,
the momentum of the light fission fragment and the momentum of the
light charged particle(LCP), both momenta lying in a plane perpendicular
to neutron spin. In the fissile U- and Cm-isotopes the asymmetry
of LCP emission relative to the plane formed by neutron spin and fragment
momentum is approaching the 0.5% level and hence quite sizable.
Surprisingly, in the newly analysed reaction 239Pu(n,f) no asymmetry
within the 0.02% error bars is detectable. In theoretical models the Todd
asymmetry is attributed to final state effects between the three outgoing
particles. Both in statistical and dynamical models the Pu result
may be understood as being due to the small compound spin of 240Pu
(0 or 1) while in the U- and Cm isotopes this spin ranges from 2 to 4
Planck units.
Time: Wednesday 14:00–16:30 Room: F
Group Report HK 34.1 Wed 14:00 F
Nuclear Astrophysics with Real Photons — •K. Sonnabend 1 ,
M. Babilon 1 , W. Bayer 1 , D. Galaviz 1 , T. Hartmann 1 , A.
Kretschmer 1 , S. Müller 1 , T. Rauscher 2 , D. Savran 1 , K.
Vogt 1 , S. Volz 1 , and A. Zilges 1 — 1 Institut für Kernphysik,
Technische Universität Darmstadt, D–64289 Darmstadt, Germany —
2 Institut für Physik, Universität Basel, CH–4056 Basel, Switzerland
Photon-induced reactions – like (γ,n), (γ,p) or (γ,α) – play the major
role in p-process nucleosynthesis. (γ,n) reaction rates are measured at
the S–DALINAC by simulating a quasi-stellar photon bath with variable
temperature [1,2]. Furthermore, the important neutron capture cross
sections of s-process branching points can be determined measuring the
(γ,n) cross section and using the detailed balance assumption [3]. We report
on the current status of our experiments using the photoactivation
technique, explain our different experimental approaches and outline the
analysis of the data for both applications – p- and s-process nucleosynthesis.
∗ supported by the DFG (SFB 634 and Zi 510/2-2) and the Swiss NSF
(grants 2124-055832.98, 2000-061822.00, and 2024-067428.01).
[1] P. Mohr et al., Phys. Lett. B 488, 127 (2000).
[2] K. Vogt et al., Phys. Rev. C 63, 055802 (2001).
[3] K. Sonnabend et al., Astrophys. J. 583, 506 (2003).
HK 34.2 Wed 14:30 F
Photon scattering off 124,128,130,132,134 Xe and the systematics of
low-lying dipole strength in the mass region of a nuclear shape
transition — •H. von Garrel 1 , P. von Brentano 2 , C. Fransen 2 ,
G. Friessner 2 , N. Hollmann 2 , J. Jolie 2 , F. Käppeler 3 , L.
Käubler 4 , U. Kneissl 1 , C. Kohstall 1 , L. Kostov 4 , A. Linnemann
2 , D. Mücher 2 , N. Pietralla 2 , H.H. Pitz 1 , G. Rusev 3,4 , R.
Schwengner 4 , M. Scheck 1 , S. Walter 1 , V. Werner 2 , and K.
Wisshak 3 — 1 Inst. für Strahlenphysik, Univ. Stuttgart — 2 Inst. für
Kernphysik, Univ. zu Köln — 3 Inst. für Kernphysik, FZ-Karlsruhe —
4 INRNE, Sofia
The Xenon isotopic chain with 9 stable isotopes presents an appropriate
case to study spectroscopic properties of nuclei in the mass region

Nuclear Physics Wednesday
of a nuclear shape transition. Starting from the spherical, magic 136 Xe
(N=82) the chain ends at the γ-soft isotopes 126,124 Xe. In the present
study the low-lying dipole strength distributions were investigated by
high-resolution photon scattering experiments. All measurements were
performed at the bremsstrahlung facility at the Stuttgart 4.3 MV Dynamitron
with photon beams of an end point energy of 4 MeV. These
novel photon scattering experiments on gaseous targets were possible due
to the development of thin-walled, high-pressure gas targets at the FZ-
Karlsruhe. After first test measurements using natural Xe gas, up to
now systematic studies of 124,128,130,132,134 Xe were carried out. First results
are presented and discussed mainly in respect to the E1 two-phonon
excitations of the quadrupole-octupole coupled type (2 + ⊗3 − ).
Supported by DFG under contracts Kn 154/31 and Pi 393/1-2
HK 34.3 Wed 14:45 F
Photoactivation and photon scattering experiments on the stellar
thermometer 176 Lu — •F. Stedile 1 , S. Walter 1 , P. von
Brentano 2 , J.J. Carroll 3 , C. Fransen 2 , G. Friessner 2 , H. von
Garrel 1 , N. Hollmann 2 , J. Jolie 2 , F. Käppeler 4 , O. Karg 5 , U.
Kneissl 1 , C. Kohstall 1 , A. Linnemann 2 , D. Mücher 2 , P. von
Neumann-Cosel 5 , N. Pietralla 2 , H.H. Pitz 1 , I. Pysmenetska 5 ,
M. Scheck 1 , V. Werner 2 , and K. Wisshak 4 — 1 Inst. f. Strahlenphysik,
Univ. Stuttgart — 2 Inst. f. Kernphysik, Univ. zu Köln — 3 Dep.
of Physics and Astronomy, Youngstown State Univ., Ohio — 4 Inst. f.
Kernphysik, FZ-Karlsruhe — 5 Inst. f. Kernphysik, TU Darmstadt
The odd-odd nucleus 176 Lu has a long half-life of about 40 Gyr and is
shielded against an r-process synthesis. Its use as s-process chronometer
or thermometer critically depends on the possible photoactivation of
the low-lying, short-lived, isomeric state (E ∗ =123 keV; t1/2=3.635h) in
176 Lu and its subsequent β − decay to 176 Hf in the stellar photon bath.
This photoexcitation process was studied at the bremsstrahlung facility
of the 4.3 MV Stuttgart Dynamitron in combined photon scattering and
photoactivation experiments using an enriched 176 Lu sample (72.5%).
Numerous new dipole excitations in 176 Lu were observed in the photon
scattering experiments performed at bremsstrahlung end point energies
of 2.3 and 3.1 MeV. The photoactivation was measured by off-line βand
γ-spectroscopy for end point energies from 0.8 to 3 MeV. Evidence
was observed for a low-lying intermediate state for the isomer population
below 1 MeV. Astrophysical implications will be discussed.
Supported by DFG (contracts Kn 154/31, Pi 393/2 and SFB 634)
HK 34.4 Wed 15:00 F
Measurement of the (γ,n) cross section of the nucleus 187 Re
close above the reaction threshold ∗ — •S. Müller, D. Galaviz,
A. Kretschmer, K. Sonnabend, K. Vogt, and A. Zilges — Institut
für Kernphysik, Technische Universität Darmstadt, Germany
Motivated by the Re/Os chronometer problem [1,2,3] the (γ,n) cross
section of the nucleus 187 Re has been measured close above the reaction
threshold Ethr=7.363 MeV at the Darmstadt electron accelerator
S-DALINAC using the method of photoactivation. Our experimental
method, the implications on the s-process branching point 186 Re and
consequently the relevance for the Re/Os chronometer problem are discussed.
In addition our results will allow to use 187 Re as a new standard
for photoactivation experiments [4]. ∗ supported by the DFG (SFB 634
and Zi 510/2-2)
[1] D.D. Clayton, Astrophys. J. 139, 637 (1964).
[2] S.E. Woosley and W.A. Fowler, Astrophys. J. 233, 411 (1979).
[3] K. Yokoi et al., Astron. Astrophys. 117, 65 (1983).
[4] K. Vogt et al., Nucl. Phys. A 707, 241 (2002).
HK 34.5 Wed 15:15 F
Systematic study of α–nucleus potentials for the astrophysical
p–process ∗ — •D. Galaviz 1 , Zs. Fülöp 2 , Gy. Gyürky 2 , G.
Kiss 2 , A. Kretschmer 1 , Z. Máté 2 , P. Mohr 1 , S. Müller 1 ,
T. Rauscher 3 , E. Somorjai 2 , and A. Zilges 1 — 1 Institut für
Kernphysik, Technische Universität Darmstadt, D–64289 Darmstadt,
Deutschland — 2 ATOMKI, H–4001 Debrecen, Ungarn — 3 Institut für
Physik, Universität Basel, CH–4056 Basel, Schweiz
The majority of the heavy proton-rich nuclei, the so-called p–nuclei,
are believed to be produced during supernova explosions in the outer
layers of very massive stars [1] in the so-called p–process where photoninduced
reactions play the dominant role.
The lack of experimental data in the relevant energy region for these
reactions, in particular (γ,α) reactions, demands for direct and indirect
measurements in order to determine the α-nucleus potentials for p–nuclei.
Therefore, we have measured the elastic scattering of α particles on different
p–nuclei at energies close to the Coulomb barrier [2-4].
In this work we present the results of high precision elastic α scattering
experiments on the p-nucleus 106 Cd and on the semi-magic nucleus 89 Y
performed at the cyclotron accelerator at ATOMKI, Debrecen.
∗ supported by DFG (SFB634 and Zi510/2-2), GSI(DA-ZIL), Swiss NSF
grant 2000-061031.02, and OTKA (T034259, F043408 and T042733).
[1] M. Rayet et al., Astron. Astrophys. 227, 271 (1990)
[2] P. Mohr et al., Phys. Rev. C 55, 1523 (1997).
[3] Zs. Fülöp et al., Phys. Rev. C 64, 065805 (2001)
[4] D. Galaviz et al., Nucl. Phys. A719,111c (2003)
HK 34.6 Wed 15:30 F
A measurement of the neutron capture cross sections of 186Os, 187 188 Os, and Os. — •Marita Mosconi — for the n TOF collaboration
The radiative neutron capture cross sections of 186Os and 187Os have
fundamental importance for the analysis of the Re/Os cosmochronometer.
These data allow one to discriminate the amount of 187Os producted
by nucleosynthesis from the one generated by radioactive decay of 187Re, an information related to onset of nucleosynthesis of the heavy elements.
The capture cross sections of the three stable isotopes 186Os, 187Os, and
188Os have been measured at the CERN n TOF facility in the energy
range from 1 eV to ∼ 1 MeV. This contribution reports on preliminary
cross section results.
HK 34.7 Wed 15:45 F
A measurement of the 14 C(n,γ) 15 C reaction with the fast
cyclic activation technique — •F. Käppeler 1 , J. Görres 2 , R.C.
Haight 3 , M. Heil 1 , R. Plag 1 , R. Reifarth 3 , R.S. Rundberg 3 ,
M. Wiescher 2 , and J.B. Wilhelmy 3 — 1 Forschungszentrum
Karlsruhe, Institut für Kernphysik, Postfach 3640, D-76021 Karlsruhe,
Germany — 2 Department of Physics, University of Notre Dame, Notre
Dame, IN 46556, USA — 3 Los Alamos National Laboratory, Los
Alamos, New Mexico 87545, USA
Inhomogeneous big bang models offer a possibility to bridge the mass
gaps at A=5 and 8 via the reaction sequence 7 Li(n,γ) 8 Li(α,n) 11 B(n,γ)
12 B(β − ) 12 C. Subsequent neutron captures 12 C(n,γ) 13 C(n,γ) 14 C will then
lead to the production of 14 C which has a half-life of 5730 years. On the
time scale of big bang nucleosynthesis 14 C can be considered as stable
and further proton, alpha, deuteron, and neutron capture reactions on
14 C will result in the production of heavier nuclei (A≥20). Due to the
high neutron abundance it is expected that the 14 C(n,γ) reaction competes
strongly with the other reactions. The 14 C(n,γ) reaction is also
important to validate (n,γ) cross sections obtained via the inverse reaction
by the Coulomb breakup method. 14 C is one of the few nuclei where
the (n,γ) reaction can be measured directly and compared with results of
Coulomb breakup experiments, in this case on the neutron-rich isotope
15 C. In this contribution we report on new measurements of the 14 C(n,γ)
reaction at neutron energies of 30, 150, and 500 keV using the fast cyclic
activation technique.
HK 34.8 Wed 16:00 F
Underground investigation of the 14 N(p,γ) 15 O reaction at low
energy — •Alba Formicola for the LUNA collaboration — Institut
für Experimentalphysik III, Ruhr-Universitüt Bochum, Germany
In view of the astrophysical importance of the 14 N(p,γ) 15 O reaction
for energy generation in massive stars, for the age of the globular cluster,
and for the prediction of the solar neutrino energy spectrum, detailed
measurements of this reaction over a wide energy range are needed. In
order to investigate at very low energies this reaction, the LUNA collaboration
has performed a high resolution gamma-ray measurement at the
400 kV underground accelerator facility installed at Laboratori Nazionali
del Gran Sasso, exploiting the strong suppression of cosmic background.
The final results of the measurement with solid state targets and the
impact for the extrapolation to astrophysical energies will be presented.
HK 34.9 Wed 16:15 F
Measurement of polarization-transfer coefficients of the fusion
reaction D( � d,�p ) 3 H at low energies — •Astrid Imig, Carsten
Düweke, Jürgen Ley, and Hans Paetz gen. Schieck — IKP,
Universität zu Köln
Understanding the four-nucleon system is of fundamental importance.
The low-energy observables of the DD reactions are especially interesting

Nuclear Physics Wednesday
in the context of fusion-energy and astrophysical considerations. amplitudes
By factoring out the Coulomb penetrabilities one is able to determine
all transition amplitudes with a minimum of model-dependent
assumptions. Thus, it is possible to predict arbitrary observables [1].
However, in the data base observables such as polarization-transfer coefficients
PTC are missing. Therefore, in order to measure these, we have
installed a double-scattering experiment directly behind the polarized ion
source. There are many experimental challenges in the determination of
HK 35 Plenary Session
PTC, i.e. due to double scattering and a strongly decreasing cross section.
Together with a new data acquisition system we are now able to
run experiments in parallel to other measurements using the Cologne FN
tandem accelerator. Thus, we plan to run continously for long periods
and to obtain sufficient statistics in reasonable time.
Supported by the DFG, contract PA 488/7-1
[1] O. Geiger et al., Nucl. Phys. A586 (1995) 140-150
Time: Thursday 08:30–10:30 Room: P
Plenary Talk HK 35.1 Thu 08:30 P
New results from CERES — •Ana Marin for the CERES collaboration
— Gesellschaft für Schwerionenforschung mbH, Darmstadt
Heavy ion collisions provide the only way to study dense and hot matter
in the laboratory. Different observables can be used to study the
fireball formed during the collision. Dileptons are particularly interesting
because of the negligible final state interactions and because they
directly probe the entire evolution of the fireball.
The CERES/NA45 experiment at CERN SPS is mainly devoted to the
study of low mass dielectrons. The upgrade with a radial drift TPC lead
to an improved dielectron mass resolution and also improved electron
identification. In addition the investigation of various hadronic observables
providing information of the characteristics of the fireball and its
evolution became accessible.
During 2000 CERES collected data from Pb + Au collisions at the
top (158 AGeV) SPS energy. The latest results on electron pairs with
improved mass resolution, particle yields from hadronic observables, fluctuations
and flow will be presented.
Plenary Talk HK 35.2 Thu 09:00 P
Dielectrons as probes for the in-medium structure of hadrons
— •Joachim Stroth for the HADES collaboration — GSI Darmstadt
and Univ. of Frankfurt
The second generation dielectron spectrometer HADES is designed to
study electron pairs emitted in collisions of heavy ions at 1-2 GeV/u as
well as in proton and pion induced reactions on protons and nuclei. It
went operational at GSI, Darmstadt in November 2001 and has been taking
data since for the C+C system at a beam energy of 2 GeV/u and in
a commissioning run also for p+p. The objective of the HADES physics
program is to establish high statistics invariant mass spectra for various
collision systems with a mass resolution of the order of 1 % in the light
vector meson mass region.
This presentation will review the physics program of HADES and
present the status of the ongoing analysis.
HK 36 Plenary Session
Plenary Talk HK 35.3 Thu 09:30 P
High Resolution Transfer Reactions and Nuclear Structure —
•R. Hertenberger 1 , H-F. Wirth 1 , Y. Eisermann 1 , G. Graw 1 ,
S. Christen 2 , O. Möller 2 , D. Tonev 2 , P. Pejovic 2 , J. Jolie 2 ,
J. Barea 3 , C. E. Alonso 3 , P. Arias 3 , and A. Frank 4 — 1 Sektion
Physik, LMU München — 2 IKP, Universität zu Köln — 3 FAMN, Universidad
de Sevilla — 4 Universidad Nacional Autonoma de Mexico
Expectations from nuclear structure models are tested by data from
high resolution transfer reactions performed at the Munich Q3D spectrograph.
The concept of supersymmetry relates in an algebraic way parts
of the low lying spectra of nuclei such as 194 Pt, 195 Au, 195 Pt, and 196 Au.
These even-even, even-odd, odd-even and odd-odd nuclei are related by
interchange of bosonic and fermionic degrees of freedom. To support a
systematic understanding our present studies aim to provide best spectroscopic
information on the odd-odd nucleus 196 Au and on neighbouring
nuclei as the neutron rich isotopes up to 202 Au. Excellent spectra with
high counting statistics have been obtained with a new focal plane detector
and with polarized beam currents of up to 2 µA on the target. We
discuss the determination of excitation energies, spin, parity and spectroscopic
factors from angular distributions of ( � d,t), ( � d, 4 He), ( 3 He,d) and
( 4 He,d).
Further activities at our facility as studies of octupole multi-phonon excitations
in 228 Th, 230 Th and 232 U and of superdeformation in 14 C and
236 U will be summarized.
The work was supported by the DFG (C4-Gr894/2-3 and Jo 391/2-1),
DGI (BFM2002-03315) and MLL.
Plenary Talk HK 35.4 Thu 10:00 P
Perspectives for high performance cluster computing —
•Zoltan Fodor — University of Wuppertal
I highlight recent progress in cluster computers and discuss status and
prospects of cluster computers with a particular emphasis for lattice
QCD. An appropriately chosen balance between the computing power
and the network can provide a advantageous price/performance ratio.
Time: Thursday 11:00–12:30 Room: P
Plenary Talk HK 36.1 Thu 11:00 P
Astrophysics related nuclear structure studies — •Heinrich Johannes
Wörtche — Kernfysisch Versneller Instituut
We have exploited transfer reactions in inverse kinematics of type
p( A N, t) A−2 N in order to populate excited states in unstable nuclei and
measure the branching ratios of successive decay modes of astrophysical
importance. Up to now, we have investigated the 15 O(α, γ) 19 Ne reaction,
which is a potential candidate for the breakout from the hot CNO cycles,
and the 21 Na(p, γ) 22 Mg reaction, which is related to the temperaturedependent
production yield of 22 Na via 22 Mg β + -decay in novae environments.
The experiments have been performed with 21 Ne and 24 Mg
beams provided by the AGOR cyclotron at 43 MeV/u and 55 MeV/u,
respectively. Due to the kinematic forward focusing, the tritons as well
as the heavy fragments are detected in the large acceptance Big-Bite
Spectrometer with 100% geometric efficiency. Our data set a stringent
limit on the α-decay branching of relevant states in 19 Ne and yielded spin
and parity assignments for excited states in 21 Na. Relating to neutrino
induced reactions, I will present data on the tensor-analyzing powers of
the 12 C( � d, 2 He) 12 B charge-exchange reaction. The measurements were
performed with purely tensor-polarized deuteron beams at 172 MeV in-
cident energy. We have studied the sensitivity of the analyzing powers
to the excitation of ∆S = ∆L = 1 spin-dipole transitions. I will present
results which allow location of the strength up to the nuclear continuum
and discuss extension of the measurements in the nuclear mass range
relevant for the neutrino detection and neutrino-nuclear processing.
Plenary Talk HK 36.2 Thu 11:30 P
Symmetry as a guiding principle in studying nuclear structure
— •Nadya Smirnova — Department of Subatomic and Radiation
Physics, University of Ghent, Ghent, Belgium
Symmetry and dynamical symmetry concepts play a fundamental role
in quantum mechanics. In particular, they can greatly simplify the formulation
and solution of the quantum many-body problems. We introduce
the notations of dynamical symmetry and its breaking, and demonstrate
how group-theoretical techniques can be used in providing analytically
energy spectra and matrix elements of other physical operators
on the example of the well-known symmetry versions of the nuclear shell
model. Next, we consider the algebraic collective model of nuclear structure,
describing the low-energy nuclear excitations in terms of interacting
protonand neutron bosons. The model has been very successful in the
description of experimental data and the prediction of new low-lying col-

Nuclear Physics Thursday
lective modes in nuclei, among which is the well-known scissors mode. As
a recently developed extension, we discuss the proton-neutron version of
the model, which incorporates quadrupole and octupole degrees of freedom.
The application has been carried out to the describe the low-energy
quadrupole-octupole colletivity in medium-mass near-spherical nuclei, including
isovector excitations in the valence shell, multiphonon structures,
and enhanced E1-transitions, which are intensively investigated in electron,
photon and proton scattering experiments.
Plenary Talk HK 36.3 Thu 12:00 P
Polarization Experiments in Storage Rings — •Frank Rathmann
— IKP, FZJ, Germany
Polarized beams in storage rings orbiting through polarized internal
targets offer new experimental possibilities. The talk will give an
HK 37 Nuclear Structure/Spectroscopy VI
overview about ongoing research and future trends. The physics outcome
of these experiments covers a wide range from deep inelastic leptonnucleon
scattering to measurements of spin observables in elastic and
inelastic proton-proton collisions. Even atomic physics experiments have
been carried out to investigate polarization effects in recombined hydrogen
and deuterium molecules. The experiments greatly benefit from the
high purity of the target materials and from the high degree of polarization.
Fast polarization reversal eliminates systematic asymmetries to
a high degree. Furthermore, the low target thickness turns out to be
actually a benefit, because neither the beam lifetime nor the beam momentum
are altered by the thin targets. Storage ring experiments should
thus be regarded as an ideal tool for high precision experiments. They
have just begun to open a new door to hadronic interaction studies and
will continue to play a major role in years to come.
Time: Thursday 13:30–16:00 Room: A
Group Report HK 37.1 Thu 13:30 A
X-Ray Spectroscopy of Kaonic Hydrogen Atoms — •Johann
Marton for the DEAR collaboration — Institut für Mittelenergiephysik,
Boltzmanngasse 3, 1090 Vienna, Austria
Kaonic hydrogen atoms were studied at the DAΦNE e + −e − collider by
resonance formation of Φ-mesons. The K − -mesons from their decay were
stopped in a cryogenic hydrogen target in which kaonic hydrogen atoms
were formed. Their X-ray deexcitation to the ground state was observed
and their energy was measured with an array of CCDs with a resolution
150 eV at 6 keV. The shift and broadening of the K spectra relative to the
electromagnetic transitions were measured The strong interaction shift
amounts to −(183 ± 62) eV with a broadening of (213 ± 138) eV.
Group Report HK 37.2 Thu 14:00 A
Study of Anti-hydrogen production at ATRAP — •D. Grzonka
for the ATRAP collaboration — Institut für Kernphysik, Forschungszentrum
Jülich, 52425 Jülich
The ATRAP experiment at the CERN antiproton decelerator AD aims
for a test of the CPT invariance by a comparison of the hydrogen to antihydrogen
atom spectroscopy. To achieve the required high precision in
the measurements of atomic transitions cold atoms of anti-hydrogen are
essential. Trapped neutral anti-hydrogen atoms, up to now not available,
have to be used.
The anti-hydrogen production via 3-body recombination routinely
operated at ATRAP [1,2] is studied in more detail in order to
characterize this production mechanism in view of future trapping
of neutral anti-hydrogen atoms. Shape parameters of the antiproton
and positron clouds and the anti-hydrogen production probability as
a function of relevant parameters have been measured. The N-state
distribution of the produced Rydberg anti-hydrogen was analyzed and
first measurements of the anti-hydrogen velocity have been performed.
Furthermore an alternative production mechanism via double charge
exchange has been studied [3]. The results achieved in 2003 and further
steps towards the trapping of anti-hydrogen atoms will be discussed.
[1] G. Gabrielse et al., Phys. Rev. Lett. 89, 213401 on line (2002).
[2] G. Gabrielse et al., Phys. Rev. Lett. 89, 233401 (2002).
[3] E. A. Hessels et al., Phys. Rev. A 57, 1668 (1998).
HK 37.3 Thu 14:30 A
Study of the 183−190 Pb by simultaneous atomic- and nuclearspectroscopy
— •Maxim Seliverstov 1 , Gerhard Huber 1 , Peter
Kunz 1 , Andrey Andreyev 2 , Hilde de Witte 2 , Piet van
Duppen 2 , Serge Franchoo 1 , Valentine Fedosseev 3 , Brigitte
Roussiere 4 , Jocelyne Sauvage 4 , and Karen van de Vel 2 —
1 University of Mainz, 55099, Mainz, Germany — 2 University of Leuven,
3001 Leuven, Belgium — 3 ISOLDE CERN, 1211 Geneve 23, Switzerland
— 4 Institut de Physique Nucleaire, IN2P3-CNRS, 91406 Orsay, France
We have extended the laser spectroscopy on Pb to very neutron deficient
isotopes at the mid-shell (N = 104). Now the Pb isotopic chain
(more than 30 isotopes and isomers) is the longest investigated chain.
The behaviour of the Z = 82 magicity is of particular interest for nuclear
physics.
The first accurate laser spectroscopic measurements with the laser ion
source (RILIS) have been performed at on-line mass-separator ISOLDE.
The nuclides were produced by spallation in an uranium-graphite target
connected to the RILIS. With a special laser control system (Uni Mainz)
long laser scans could be performed. This was essential for the detection
of the photoions by their radioactive decay at a β-γ (IPN, Orsay) and
α-γ spectroscopy set-ups (Uni Leuven). The combination of atomic and
nuclear spectroscopy allowed to identify the resonances from ground- and
isomeric- states.
The new results for Pb isotopes will be compared to the corresponding
data for the lighter Hg and Pt isotones.
HK 37.4 Thu 14:45 A
Low-lying resonances in the halo-nucleus 6 He — •P. Haefner 1 ,
C. Bäumer 1 , A. van den Berg 2 , D. Frekers 1 , D. De Frenne 3 ,
E.-W. Grewe 1 , M.N. Harakeh 2 , M. Hunyadi 2 , E. Jacobs 3 , H.
Johansson 4 , B. Junk 1 , A. Korff 1 , A. Negret 3 , P. von Neumann-
Cosel 5 , L. Popescu 3 , S. Rakers 1 , A. Richter 5 , N. Ryezayeva 5 ,
A. Shevchenko 5 , and H.J. Wörtche 2 — 1 Westfälische Wilhelms-
Universität Münster — 2 Kernfysisch Versneller Instituut, Groningen —
3 Universiteit Gent — 4 GSI, Darmstadt — 5 TU Darmstadt
Measurements of the (d, 2 He) charge exchange reaction were performed
on 6 Li at an incident energy of 85 MeV/A to investigate the structure of
the halo-nucleus 6 He. A laboratory angle of 0 ◦ to 15 ◦ was covered. The
energy resolution was 130 keV (FWHM). As the two protons of 2 He are
measured in coincidence, the spectra are free of instrumental background.
We analysed angular distributions for the ground state transition, the
first excited 2 + -state at 1.797 MeV and the broad resonances up to 25
MeV. The weakly bound nucleus 6 He serves as a prototype for so-called
Borromean systems (α + n + n). The resonances seen in our experiment
will be compared to theoretical predictions of three-body models.
Supported by the EU as LIFE-Project under HPRI-1999-CT-00109.
HK 37.5 Thu 15:00 A
Proton Induced Deuteron Breakup Cross-Section Measurements
at 16.0 MeV — •C.D. Düweke 1 , A. Imig 1 , J. Ley 1 , H.
Wita̷la 2 , and H. Paetz gen. Schieck 1 — 1 IKP, University of
Cologne, Germany — 2 Jagellonian University, Cracow, Poland
We investigated the 2 H(p, pp)n breakup reaction at Ep = 16MeV by
measuring four kinematically complete configurations. The data of three
so-called star configurations (the momenta of the three emitted nucleons
in the c.m. lie in the same plane, have equal magnitude and are separated
by 120 ◦ ) and one final-state interaction (FSI) were taken at the Cologne
tandem accelerator. Former three-nucleon (3N) measurements showed
some discrepancies between the experimental data and the theoretical
predictions, which are based on 3N Faddeev calculations performed including
the 2π-exchange Tucson-Melbourne 3N force. Specifically the
measurement of the neutron-induced deuteron breakup at En = 16MeV
[1] points to a significant difference between experiment and theory for
the FSI. The measured cross sections are obviously lower than the theory
in the final-state peaks. We intend to learn more about this discrepancy
in the analogue reaction and to complement the breakup systematics
between Ep = 13MeV and Ep = 19MeV [2].
[1] A.S. Crowell Ph.D. thesis, TUNL, Duke University (2001)
[2] H. Paetz gen. Schieck et al., Few-Body Systems 30, 80 (2001)

Nuclear Physics Thursday
HK 37.6 Thu 15:15 A
Tensor analyzing power Ayy in the SCRE configuration for the
breakup reaction 1H( � d, pp)n at E� d = 19 MeV — •J. Ley1 , C.D.
Düweke1 , A. Imig1 , H. Paetz gen. Schieck1 , and H. Wita̷la 2 —
1 2 IKP, Universität zu Köln, Germany — Jagellonian University Cracow,
Poland
In the Symmetric Constant Relative Energy geometry all three nucleons
of the dp breakup reaction are emitted at relative angles of 120◦ in the c.m. system. They have equal kinetic energies and both protons
are emitted symmetrically to a plane defined by the reversed beam axis
and the outgoing neutron. The SCRE final state can be characterized in
the c.m. system by the angle α between the neutron momentum and the
beam axis. The tensor analyzing power Ayy in this geometry has been
calculated in the framework of the three-nucleon Faddeev theory using
realistic nucleon-nucleon potentials. The comparison of older dp breakup
data at E� d = 94.5 MeV [1] and E� d = 52.1 MeV [2] with theoretical
predictions had shown significant deviations. In order to investigate,
whether such deviations would appear at E� d = 19 MeV too, a breakup
experiment with four SCRE and twelve adjacent situations was designed.
First results will be reported.
Supported by the DFG.
[1] H. Wita̷la et al., Phys. Rev. C 52 (1995) 2906
[2] L.M. Qin et al., Nucl. Phys. A 587 (1995) 252
HK 37.7 Thu 15:30 A
PREDICTION OF FISSION MASS-YIELD DISTRIBUTIONS
BASED ON CROSS-SECTION CALCULATIONS — •S. Oberstedt
1 , F.-J. Hambsch 1 , G. Vladuca 2 , A. Tudora 2 , and D. Filipescu
2 — 1 EC-JRC IRMM, Retieseweg, B-2440 Geel — 2 Bucharest
University, Faculty of Physics, RO-76900 Bucharest
The statistical model for fission cross-section evaluation is extended by
the concept of multi-modality of the fission process. The three most dom-
inant fission modes, the two asymmetric standard I (S1) and standard II
(S2) modes and the symmetric superlong (SL) mode are taken into account.
De-convoluted fission cross-sections for S1, S2 and SL modes for
235,238 U(n, f) and 237 Np(n, f), based on experimentally obtained branching
ratios, were calculated for the first time in the incident neutron-energy
range from 0.01 to 5.5 MeV. Good agreement was found with the experimental
neutron-induced reaction cross-section data from competitive
reaction channels as well. Fission-mode branching ratios were obtained
over the whole incident neutron-energy range. The possibility to predict
fission-fragment yield and energy distributions at neutron energies,
where no experimental data exist, is demonstrated.
HK 37.8 Thu 15:45 A
Multistep Direct Reaction Approach for Pre-Equilibrium Reactions
at Intermediate Energies — •H. Lenske 1 , E. Ramström 2 ,
and H.H. Wolter 3 — 1 Inst. Theor. Physik. Univ. of Giessen —
2 Dept. Rad. Science, Uppsala Univ., Sweden — 3 Sektion Physik, Univ.
of Munich
Nucleon-induced pre-equilibrium reactions are of increased interest
partly as a study case for nuclear equlibration, partly because of applications
in accelerator-driven systems. A quantum-mechanical approach
is provided by the Statistical Multistep Direct Reaction Method, which
describes the reaction as a sequence of direct reaction steps, with certain
statistical assumptions on the nature of the nuclear states. In particular,
in the TUL variant of the method, the strength distribution in the continuum
is calculated from an averaged microscopic many-body approach,
so that collective and statistical aspects are taken into acount simultaneously.
The method has been applied to recent nucleon-induced charge
exchange reactions in the energy range of 20-100 MeV. It is found that
the method including two steps describes the excitation spectra well for
excitation energies up to 20 MeV and not too large angles. It is discussed
which other mechanisms may play a role at more inelastic processes.
HK 38 Electromagnetic and Hadronic Probes VI
Time: Thursday 13:30–16:00 Room: B
Group Report HK 38.1 Thu 13:30 B
Photoproduction of ρ 0 mesons and ∆ ++ baryons in the reaction
γp → pπ + π − — •Karl-Heinz Glander for the SAPHIR collaboration
— Physikalisches Institut, Universität Bonn
Photoproduction of ρ 0 mesons and ∆ ++ baryons at photon energies
from its threshold to 2.6 GeV have been studied with the SAPHIR detector
at the electron stretcher ELSA. The total and differential cross
sections were obtained. The angular decay distributions of the ρ 0 meson
show the s-channel helicity conservation, which is kept at higher photon
energies, to be broken slightly near threshold. One-boson-exchange
models can describe approximately the behavior of total and differential
cross sections of ρ 0 photoproduction near threshold.
Group Report HK 38.2 Thu 14:00 B
Two-Pion Decay of Resonances and the Reaction πN → ππN
— •Sonja Schneider and Siegfried Krewald — Institut für Kernphysik,
Forschungszentrum Jülich, D-52425 Jülich
The understanding of the spectrum and the decay properties of baryons
is essential to our understanding of QCD in the non-perturbative regime.
We focus on the investigation of the two-pion decay of the low-lying
N ⋆ resonances, especially the Roper Resonance P11(1440), in the reaction
πN → ππN.
To describe pion-induced two-pion production on the proton, we start
from a resonance exchange model similar to the model of Oset and
Vicente-Vacas[1] with contributions from the excitation of the ∆ isobar
and the N ⋆ resonances P11(1440), D13(1520) and S11(1535).
A calculation at Born level already leads to reasonable agreement with
the available data. Only the angular distributions are not well reproduced
– for π + p → π + π + n and π − p → π 0 π 0 n they even have the opposite curvature.
The simple tree-level model can be improved by the inclusion of
initial and final state interaction. Such effects can be included for the
pole contributions in a relatively simple way. The results we obtain with
this improved model will be discussed.
[1] E. Oset and M.J. Vicente-Vacas, Nucl. Phys. A446, 584 (2000).
HK 38.3 Thu 14:30 B
Close to threshold strangeness production in pp collisions —
•Peter Winter for the COSY-11 collaboration — Institut für Kernphysik,
Forschungszentrum Jülich
Exclusive data on the pp → ppK + K − reaction near the production
threshold have been taken at the internal experiment COSY-11 [1].
These studies are motivated not only by the possibility to investigate
the proton kaon interaction but also by the discussion on the nature of
the scalar resonances f0(980) and a0(980). A first total cross section
σ = 1.80 ± 0.27 +0.28
−0.35 for the excess energy Q = 17 MeV has been determined
[2].
In contrary to the η, ω and η ′ production, the cross section values
obtained at COSY-11 [2] and DISTO [3] are in good agreement with
one-meson exchange calculations neglecting final state interaction (FSI)
effects [4] as well as with a fit of a four body phase space including the
strong pp FSI. Since the strong pp interaction could be compensated
by the not well established pK − FSI or due to an additional degree of
freedom caused by the four-body final state [4], the investigation of the
close to threshold region was extended at the excess energies Q = 10 and
17 MeV where strong FSI effects should be more pronounced. The data
analysis will be presented and discussed.
[1] S. Brauksiepe et al., Nucl. Instr. & Meth. A 376 (1996) 397.
[2] C. Quentmeier et al., Phys. Lett. B 515 (2001) 276.
[3] F. Balestra et al., Phys. Rev. C 63 (2001) 024004.
[4] A. Sibirtsev, Publ. of Research Centre Jülich: Matter and Materials
11 (2002) 239.
HK 38.4 Thu 14:45 B
Two-Pion Production at CELSIUS-WASA and the Quest for
the Nature of σ Meson and Roper Resonance ∗ — •T. Skorodko,
M. Bashkanov, H. Clement, E. Doroshkevich, M. Kaskulov,
R. Meier, and G.J. Wagner for the CELSIUS-WASA collaboration
— Physikalisches Institut, Universität Tübingen
The two-pion production in proton-proton collisions has been measured
at CELSIUS in the energy range Tp = 775 - 1360 MeV using the WASA
4π detector with hydrogen pellet target. The WASA detector containing

Nuclear Physics Thursday
magnetic field, tracking detectors and calorimeter, allows the detection
of both charged and neutral particles. The channels ppπ + π − , ppπ 0 π 0
and dπ + π 0 have been measured exclusively with 4 overconstraints. Our
first exclusive ppπ + π − data taken at PROMICE/WASA near threshold
have been shown [1] to be in agreement with the process proceeding via
the Roper resonance as predicted by calculations of the Valencia group
[2]. Alternatively, the data are equally well described by ππ rescattering
leading to a dynamic formation of the σ meson. With increasing incident
energies the agreement of the Valencia prediction with the new data in
ppπ + π − and ppπ 0 π 0 channels gets worse and finally at variance for Tp > 1
GeV. Rather the data in these channels get consistent with the formation
of a (∆∆) 0 + configuration at the highest energies. In the dπ + π 0 channel
the data show the onset of ρ-production.
[1] Brodowski et al. PRL 88 192301 (2002); PRC 67 052202 (2003)
[2] L. Alvarez-Ruso et al., Nucl. Phys. A633, 519 (1998)
∗ supported by the BMBF (06 TU 201), DFG (Europ. Graduiertenkolleg)
and Landesforschungsschwerpunkt (Quasiteilchen)
HK 38.5 Thu 15:00 B
Indication of anomalous exchange in exclusive charmonium
photoproduction. — •Alexander Sibirtsev 1 , Siegfried Krewald
1 , and Anthony W. Thomas 2 — 1 IKP-TH, FZJ, Juelich —
2 Adelaide University
We find that available data on J/Ψ photoproduction at |t|≥1 GeV are
energy independent over the range 22≤ √ s≤170 GeV and show a very
soft t dependence. These results are in striking contradiction with perturbative
QCD. Through a systematic analysis of the data we detect a
new trajectory, which manifests itself at threshold and is energy independent.
The trajectory couples to the axial form factor of the nucleon
and can reproduce the J/Ψ exclusive photoproduction data at large -t.
It would be of great interest to study J/Ψ photoproduction at low
energies, which should be possible with the operation of HALL D at Jefferson
Lab and to clarify whether the forward cross section approaches a
value of order 20 nb·GeV −2 starting from threshold.
The contribution from the new trajectory can be investigated experimentally
in elastic antiproton-proton scattering at large t that can be
done at HESR. The contribution from the new trajectory, which scales
as s 0 should be well distinguished from the hard scattering processes
that scale as s −10 . HESR is an unique machine that provides access to
large t within large range of s and let us to study the interplay between
perturbative and non-perturbative QCD.
HK 38.6 Thu 15:15 B
Baryon resonances in pion- and photo-production reactions —
•Vitaly Shklyar and Ulrich Mosel — Institut für Theoretische
Physik, Universität Giessen, 35392 Giessen, Germany
The interest in studies of baryon resonance spectra has grown significantly
last year. Despite the great efforts made in the past, the properties
HK 39 Instrumentation and Applications V
of many observed baryon resonances cited in PDG [1] are not fairly settled
yet. For the consistent identification of the resonances and their properties,
the advent of multi-channel, unitary models is inevitable. With
this aim in mind we develop an effective Lagrangian coupled-channel approach
which preserves unitarity and allows for a simultaneous analysis
of γN, πN, 2πN, ηN, KΛ, KΣ, and ωN final states. The obtained
results are presented and discussed.
Work supported by FZ Jülich and GSI.
[1] K. Hagiwara et al., Phys. Rev. D66 (2002) 010001, http://pdg.lbl.gov.
HK 38.7 Thu 15:30 B
Coupled channels calculations for photo-induced K-Λ and K-
Σ production — •Alexander Usov and Olaf Scholten — KVI,
9747 AA Groningen, The Netherlands
We calculated K-Λ and K-Σ photoproduction in gauge-invariant coupled
channels framwork. Different recipe’s for restoring gauge invariance
are compared, such as Ohta’s minimal-substitution method[1] and Davidson
- Workman’s recipe[2]. The difference between these procedures is
analyzed in terms of a four-point ’contact’-term. We find that the calculated
cross sections strongly depend on the choice for this contact term.
A recent microscopic calculation[3] suggest that the structure of the contact
term depends strongly on the mass of the intermediate particles used
to dress the vertex. A consistent calculation of vertex dressing, in line
with [4] is thus called for.
[1] K. Ohta, Phys. Rev. C40, 1335 (1989); S. Kondratyuk and
O. Scholten, Nucl. Phys. A677, 396 (2000)
[2] R.M. Davidson and R. Workman, Phys. Rev. C63, 025210 (2001);
and Phys. Rev. C63, 058201 (2001)
[3] A.Yu. Korchin and O. Scholten, Phys. Rev. C68, 045206 (2003)
[4] S. Kondratyuk and O. Scholten, Phys. Rev. C64, 024005 (2001)
HK 38.8 Thu 15:45 B
Photo-induced Φ-meson production in a coupled channels
framework. — •Olaf Scholten — KVI, 9747 AA Groningen, The
Netherlands
Results are presented of a coupled channels calculation of photoinduced
Φ-meson production off the proton. In addition to π-N also the
coupling to the η-N, K-Λ and K-Σ channels is taken into account with
realistic coupling constants in a gauge-invariant approach. The approach
is in some respects similar to that of ref.[1]
Coupled channels effects are shown to have large effects on the cross
sections at larger scattering angles. Much of the structure seen in various
polarization observables appears to be due to the interplay between the
direct reaction component and coupled channels effects.
[1] A.Yu. Korchin, O. Scholten and R.G.E. Timmermans, Phys. Lett.
B438, 1 (1998); G. Penner and U. Mosel, Phys. Rev. C 66, 055212
(2002).
Time: Thursday 13:30–16:00 Room: C
Group Report HK 39.1 Thu 13:30 C
The Electromagnetic Calorimeter of PANDA — •Rainer
Novotny for the PANDA collaboration — 2nd Physics Institute,
University Giessen
Experiments with the cooled antiproton beam at the future accelerator
facility at GSI, Darmstadt, will be performed with the 4 π detector
PANDA, which comprises a high resolution, compact and fast homogeneous
electromagnetic calorimeter to detect photons between 10 MeV and
10 GeV energy inside a superconducting solenoid. Lead tungstate (PWO)
and BGO are considered as the most appropriate scintillator materials.
In order to achieve sufficient energy and time resolution at low energies
an experimental program has been started to improve significantly the
luminescence yield of PWO by appropriate doping and/or structural perfection.
In addition, an efficient photo sensor to be operated within the
magnetic field is mandatory. The development of large size avalanche
photo diodes has been started. The presentation will cover in detail the
instrumental requirements, the design concept and the expected performance
of the calorimeter. First results achieved with prototype detectors
will illustrate the quality, radiation hardness and performance of new
generation crystals as well as the response and applicability of several
alternative photo sensors.
Group Report HK 39.2 Thu 14:00 C
The HERMES Recoil Detector — •Lukas Rubacek for the HER-
MES collaboration — II. Physikalisches Institut, Uni Giessen, 35392
Giessen
Generalized Parton Distributions (GPDs) are a novel theoretical approach
to unde rstand the internal structure of hadrons. Experimentally,
GPDs are accessible via the measurement of hard exclusive reactions.
HERMES has already investigated the se reaction in e.g. Deeply Virtual
Compton Scattering (DVCS) or hard exclusive electroproduction of
ρ mesons. The recoil detector will significa ntly improve the current resolution
of these type of measurements at HERMES. The HERMES Recoil
Detector will consist of three active detector components: a silicon detector
surrounding the target cell inside the beam vacuum, a scintillating
fiber (SciFi) tracker and a photon detector consisting of a tungst en scintillator
sandwich. The whole detector will be placed in a longitudinal
magne tic field of about 1 Tesla. The individual detector components
have been successfully tested at pion and proton beams. of the pr oject.

Nuclear Physics Thursday
HK 39.3 Thu 14:30 C
Performance of the large straw drift trackers in Compass —
•Alexander Zvyagin for the COMPASS collaboration — CERN CH-
1211 Geneve 23
The COMPASS experiment at CERN investigates the interaction of
a polarised muon beam of 160 GeV/c momentum with a polarised nucleon
target in order to measure the polarised gluon structure △G function
of the nucleon. The key reaction is the photon gluon fusion into
charm anticharm. In the detection of the sequential decay of D-mesons
D ∗ → D 0 π, D 0 → Kπ a primary role is played by the large area tracking
detectors. Among them there are 30 layers of straw drift detectors
with an area of ≈ 10m 2 and ≈ 400 channels each. To obtain the desired
15MeV mass resolution of D-mesons the spatial resolution of straw detector
layer should be better then 300µm. The talk will concentrate on
the performance of the straw detectors in the 2002 and 2003 year runs.
HK 39.4 Thu 14:45 C
First Experience with the Lambda Wheel — •Michiel Demey,
Andreas Reischl, and Jos Steijger for the HERMES collaboration
— NIKHEF PO Box 41882, 1009 DB Amsterdam, The Netherlands
The Lambda Wheel is a tracking detector built from silicon strip sensors.
It is installed in the vacuum of the target chamber in the HERMES
experiment at DESY and located at a distance of 25 cm from the end
of the target cel. The detector consists out of two disks which cover a
radial area between 4.5 and 16 cm from the beam. Both disks are made
of double sided silicon with a thickness of 300 µm and a strip pitch of
160 µm. In total there are 24000 strips to be readout.
Since the startup of the HERA accelerator in September 2003 this detector
is part of the HERMES spectrometer. First studies on alignment
and efficiencies will be presented together with preliminary results on
track reconstruction.
HK 39.5 Thu 15:00 C
Simulation of the Micro-Vertex Detector and the Straw
Tube Tracker for the proposed PANDA detector at GSI.
— •Andrei Sokolov 1 and James Ritman 2 for the PANDA
collaboration — 1 GSI, Darmstadt, Germany — 2 II, Physikalisches
Institut, Justus-Liebig-Universität Gießen
One of the components of the approved expension to the accelerator facility
at GSI/Darmstadt is a storage ring for high luminosity phase space
cooled antiprotons with momenta between 1.0 and 15 GeV/c. Antiproton
annihilation reactions on protons and nuclei will be investigated with
a detector system called PANDA. Two critical items of the central tracking
system are the Micro Vertex Detector (MVD) and the Straw Tube
Tracker (STT). The MVD has high position resolution (∼ 20µm) to identify
tracks from the decay of open charm particles. The STT provides the
fast tracking needed to handle the high events rate (10 7 events/s). This
talk will present an overview of the simulations performed to investigate
performance of the MVD and STT for PANDA.
HK 40 Theory VI
HK 39.6 Thu 15:15 C
Particle Identification with the PANDA detector at GSI —
•Carsten Schwarz for the PANDA collaboration — GSI, 64291 Darmstadt,
Germany
One of the objectives of the future GSI project is the research with high
luminosity antiproton beams in a high energy storage ring (HESR). The
interactions with an internal hydrogen or nuclear target will be measured
with the nearly hermetic PANDA detector, which can not only
leptonic and electromagnetic decay channels identify but also hadronic
final states by tracking the reaction products in a magnetic field. The
particle identification is performed by two ring imaging Cherenkov counters,
one proximity focussing detector in forward direction, and for larger
angles, one using internal reflection of the photons (DIRC). They aim for
good p/K separation over a large momentum region. Simulation results
and technical issues like radiator choice, quality requirements, optics and
photon readout will be discussed.
HK 39.7 Thu 15:30 C
Report on the A4 transmission Compton polarimeter —
•Christoph Weinrich — Johannes-Gutenberg-Universität, Institut
für Kernphysik, D-55099 Mainz
The A4 collaboration measures at MAMI (Mainz Microtron) the parity
violating asymmetry in the scattering of longitudinally polarised electrons
off unpolarised hydrogen. The size of this asymmetry is about 6
ppm. From this asymmetry the contributions of the strange quarks to the
electromagnetic form factors of the nucleon may be determined. Good
knowledge of the electron beam polarisation is important because the
relative error in the polarisation measurement contributes with a factor
of 1 to the relative error of the measured parity violating asymmetry.
The transmission Compton polarimeter which has to be calibrated
with an absolutely measuring polarimeter was designed as a polarisation
monitor between Møller polarimeter measurements and to adjust the spin
direction for the experiment.
This talk will give an overview about setup, functionality, present results
and remaining tasks of the polarimeter.
HK 39.8 Thu 15:45 C
Stabilization of the laser system of the A4-Compton-
Backscattering-Polari meter — •Jürgen Diefenbach — Institut
für Kernphysik, Universität Mainz
The A4 collaboration measures strange form factors of the nucleon in
the elastic scattering of polarized electrons off the proton at the MAMI
accelerator facility in Mainz. To perform an online monitoring of the
electron beam polarization a laser backscattering compton polarimeter
has been developped. Due to the new intracavity design of the backscattering
polarimeter an active stabilization of the 8.2m long laser resonator
is unavoidable to achieve stable overlap of laser and electron beam and
to optimize the polarimeter’s luminosity. The design ideas and actual
setup of the stabilization will be presented and discussed.
Time: Thursday 13:30–16:00 Room: D
Group Report HK 40.1 Thu 13:30 D
Gluon and ghost propagators at finite and high temperatures in
Landau gauge Yang-Mills theory — •Burghard Grüter 1 , Axel
Maas 2 , Reinhard Alkofer 1 , and Jochen Wambach 2 — 1 Institut
für Theoretische Physik, Universität Tübingen, Auf der Morgenstelle 14,
72076 Tübingen — 2 Institut für Kernphysik, TU Darmstadt, Schloßgartenstraße
9, 64289 Darmstadt
The infrared behaviour of the gluon and ghost propagators for zeroflavour
QCD in Landau gauge is investigated at non-vanishing temperatures.
The study is based on an extension of a well understood truncation
scheme for Dyson-Schwinger Equations (DSE) at zero temperature [1] to
non-vanishing temperature [2].
The results for temperatures below the expected phase transition show
only weak temperature dependence. The corresponding CJT effective action
will be discussed.
In the high temperature limit the four-dimensional Yang-Mills theory
is reduced to a three-dimensional one with an additional adjoint Higgs
field. The numerical results obtained from the corresponding DSEs [2]
yield a ”Higgs” propagator close to a massive tree-level propagator, indi-
cating the existence of a chromoelectric screening mass at high temperatures.
The transverse gluon propagator still is infrared vanishing thus
no screening of soft chromomagnetic modes occurs.
[1] C. S. Fischer and R. Alkofer, Phys. Rev. 65 094020(2003)
[2] A. Maas, B. Grüter, R. Alkofer, J. Wambach, hep-ph/0210178
Supported by the European Graduate School Basel-Tübingen (DFG contract
GRK683) and BMBF under grand 06DA917
Group Report HK 40.2 Thu 14:00 D
Center Vortex Model for the Infrared Sector of SU(3) Yang-
Mills Theory — •Markus Quandt, Michael Engelhardt, and
Hugo Reinhardt — Institut für Theoretische Physik, Universität
Tübingen, 72076 Tübingen, Germany.
The center vortex model for the infrared sector of Yang-Mills theory,
previously studied for the SU(2) gauge group, is extended to SU(3) [1].
This model is based on the assumption that vortex world-surfaces can
be viewed as random surfaces in Euclidean space-time. The confining
properties are investigated, with a particular emphasis on the finitetemperature
deconfining phase transition. The model predicts a very

Nuclear Physics Thursday
weak first order transition, in agreement with SU(3) lattice Yang-Mills
theory, and also reproduces a consistent behavior of the spatial string
tension in the deconfined phase. The geometrical structure of the center
vortices is studied, including vortex branchings, which are a new property
of the SU(3) case.
[1] M. Engelhardt, M. Quandt, H. Reinhardt, hep-lat/0311029.
HK 40.3 Thu 14:30 D
On vortex induced confinement in SU(3) Yang-Mills theory
— •Daniel-Jens Kusterer and Kurt Langfeld — Institut für
Theroetische Physik, Universität Tübingen, D-72076 Tübingen
Quark confinement is studied by means of SU(3) lattice gauge theory
employing Wilson action [1] and improved action, respectively. The
center vortex structure of the vacuum is revealed and its relevance for
confinement is studied. For this purpose, modified Yang-Mills ensembles
are defined by removing the vortices from the lattice configurations.
We show that the modified theory does not confine quarks. Finally, we
confirm that the vortices properly extrapolate to the continuum limit
emphasizing their relevance for continuum Yang-Mills theory.
[1] K. Langfeld, Vortex matter in SU(3) lattice gauge theory, heplat/0307030,
PRD in press.
HK 40.4 Thu 14:45 D
Signatures of Large Extra Dimensions — •Sabine Hossenfelder
1 , Stefan Hofmann 2 , Marcus Bleicher 1 , Horst
Stöcker 1 , Christoph Rahmede 1 , Sascha Vogel 1 , Ulrich
Harbach 1 , and Katja Poppenhäger 1 — 1 Institut für Theoretische
Physik, Robert-Mayer-Str. 10, 60054 Frankfurt am Main — 2 Dept. of
Physics, Stockholm University, SCFAB, SE-10691 Sweden
String theory suggests modifications of our spacetime such as extra
dimensions and the existence of a mininal length scale. In models with
addidional dimensions, the Planck-scale can be lowered to values accessible
by the LHC in soon future which in turn solves the hierarchy problem
an lowers the unification scale. These models yield an useful effective description
of physics beyond the standard model. We calculate predictions
within this scenario such as production of gravitons, production of black
holes and a finite resolution of spacetime which is expected near the
Planck-scale.
[1] S. Hossenfelder, M. Bleicher, S. Hofmann, J. Ruppert, S. Scherer,
H. Stocker, Phys.Lett. B575 (2003) 85-99, hep-th/0305262
[2] S. Hossenfelder, S. Hofmann, M.Bleicher, Horst Stocker, Phys.Rev.
D66 (2002) 101502, hep-ph/0109085
[3] S. Hofmann, M. Bleicher, L. Gerland, S. Hossenfelder, K. Paech, H.
Stocker, J.Phys.G28:1657-1665 (2002)
HK 40.5 Thu 15:00 D
Uncertainty in the 0νββ decay nuclear matrix elements —
•Vadim Rodin 1 , Amand Faessler 1 , Fedor ˇSimkovic 1,2 , and Petr
Vogel 3 — 1 Institut für Theoretische Physik, Universität Tübingen, Auf
der Morgenstelle 14, D-72076 Tübingen, Germany — 2 Department of
Nuclear Physics, Comenius University, Mlynská dolina F1, Bratislava,
Slovakia — 3 Department of Physics 106-38, California Institute of Technology,
Pasadena, CA 91125, USA
The discovery of oscillations of atmospheric, solar and reactor neutrinos
has shown that neutrinos have a non-vanishing rest-mass. However,
only study of the neutrinoless double beta decay (0νββ) can provide crucial
information on the Majorana nature of the neutrinos and on their
absolute mass scale [1].
Nuclear matrix elements M 0ν of the neutrinoless double beta decay
(0νββ) have been evaluated in [2] for several nuclei within the Renormalized
Quasiparticle Random Phase Approximation (RQRPA) and the
simple QRPA. Three sets of single particle level schemes have been used.
When the strength of the particle-particle interaction is adjusted so that
the 2νββ decay rate is correctly reproduced, the resulting M 0ν values
become essentially independent on the size of the basis, and on the form
of different realistic nucleon-nucleon potentials. Thus, one of the main
reasons for variability of the calculated M 0ν within these methods is
eliminated. In our talk we give a summary of the calculation results.
[1] A. Faessler and F. ˇ Simkovic, J. Phys. G 24 (1998) 2139
[2] V. A. Rodin, A. Faessler, F. Simkovic and P. Vogel, Phys. Rev. C
68 (2003) 044302
HK 40.6 Thu 15:15 D
Chiral dynamics and the transverse size of the nucleon’s gluon
distribution at small x — M. Strikman 1 and •C. Weiss 2 —
1 Pennsylvania State U., USA — 2 Regensburg U.
We study the distribution of gluons in transverse space in the nucleon
at moderately small x (∼ 10 −2 ). At large transverse distances (impact
parameters) the gluon density is generated by the “pion cloud” of the
nucleon, and can be calculated in terms of the gluon density in the pion.
We investigate the large–distance behavior in two different approaches to
chiral dynamics: i) phenomenological soft–pion exchange, ii) the large–
Nc picture of the nucleon as a classical soliton of the pion field, which
corresponds to degenerate N and ∆ states. The large–distance contributions
from the “pion cloud” cause a ∼ 20% increase in the overall
transverse size of the nucleon if x drops significantly below Mπ/MN.
This is in qualitative agreement with the observed increase of the slope
of the t–dependence of the J/ψ photoproduction cross section at HERA
compared to fixed–target energies. We argue that the glue in the pion
cloud could be probed directly in hard electroproduction processes accompanied
by “pion knockout”, γ ∗ + N → γ (or ρ, J/ψ) + π + N ′ ,
where the transverse momentum of the emitted pion is large while that
of the outgoing nucleon is restricted to values of order Mπ [1].
[1] M. Strikman and C. Weiss, hep-ph/0308191
HK 40.7 Thu 15:30 D
Checking Lorentz-Invariance Relations Between Parton Distributions
— •Marc Schlegel 1 , Klaus Goeke 1 , Andreas Metz 1 ,
Pavel Pobylitsa 1,2 , and Maxim Polyakov 1,2 — 1 Institut f. Theor.
Physik II, Ruhr-Uni-Bochum, D-44780 Bochum, Germany — 2 Petersburg
Nuclear Physics Institute, Gatchina, Petersburg, 188300 Russia
Lorentz-invariance relations connecting twist-3 parton distributions
with transverse momentum dependent twist-2 distributions have been
proposed previously. Naively, these relations can be extracted from a
covariant decomposition of the quark-quark correlator. It is argued that
the derivation of the Lorentz-invariance relations fails if the path-ordered
exponential, which ensures gauge invariance, is taken into account in the
correlator. Our model-independent analysis is supplemented by an explicit
calculation of the corresponding parton distributions in perturbative
QCD with a quark target, and in a simple model of Brodsky-Hwang-
Schmidt.
HK 40.8 Thu 15:45 D
Soft Pion Emission in Hard Exclusive Pion Production on
the Nucleon — •Simone Stratmann 1 and Maxim V. Polyakov 2
— 1 Institut fuer Theoretische Physik II, Ruhr-Universitaet Bochum —
2 Institut de Physique, B5a, Universite de Liege au Sart Tilman
We have investigated hard exclusive reactions on the nucleon with softpion
contamination. It turns out that after factorization, the corresponding
amplitudes contain transition matrix elements of lightcone operators
with initial nucleon and final nucleon-pion state. A parametrization of
these objects is provided. In order to calculate them, we formulate a
generalization of soft-pion theorems for the case of lightcone operators.
Applying these results, we can express the transition matrix elements in
terms of usual generalized parton distributions. Finally, we present our
results on hard charged pion production on the proton with soft pion
emission that were obtained by this method.

Nuclear Physics Thursday
HK 41 Heavy Ions IV
Time: Thursday 13:30–16:00 Room: E
Group Report HK 41.1 Thu 13:30 E
Azimuthal emission pattern of K + and K − at SIS energies[*]
— •Mateusz P̷loskoń for the Kaos collaboration — GSI Darmstadt,
Germany
The Kaos Collaboration has been investigating the production of kaons
and antikaons in Au+Au and Ni+Ni collisions at beam energies between
1 and 2AGeV as a function of the collision centrality, the particle energy
and the emission angles[1]. The anisotropy of the azimuthal emission
pattern of K + mesons provides evidence for a repulsive kaon-nucleon potential
in the nuclear medium[2]. New information on the in-medium potentials
of antikaons is expected from the measurement of their azimuthal
angle distributions. Recent experimental results will be discussed.
[*] Supported by BMBF and GSI
[1] A.Förster, F. Uhlig et al, PRL 91 (2003) 152301
[2] Y.Shin et al PRL 81 (1998) 1576
Group Report HK 41.2 Thu 14:00 E
Nuclear Stopping at SIS Energies - Results from FOPI — •Olaf
Hartmann for the FOPI collaboration — Gesellschaft für Schwerionenforschung
mbH, Darmstadt, Germany
We present a complete systematics (excitation function and systemsize
dependence) of global stopping for heavy ion reactions in the energy
range between 90A MeV and 1.93A GeV studied with the FOPI detector.
For the heaviest system, Au+Au, we observe a plateau of maximal
stopping extending from about 200A to 800A MeV with a fast drop on
both sides. The degree of stopping, which is shown to remain significantly
below the expectations of a full stopping scenario, is found to be
highly correlated to the amout of sideflow. Isospin tracing experiments
at 0.4A and 1.5A GeV using the system 96 Ru/ 96 Zr and an analysis of
the asymmetric reaction 40 Ca+ 197 Au at 1.5A GeV confirm a significant
increase of transparency in the upper range of the studied energies. The
data are confronted to a microscopic transport calculation.
Group Report HK 41.3 Thu 14:30 E
Strange particles measured with FOPI ∗ — •Markus Merschmeyer
for the FOPI collaboration — Physikalisches Institut der
Universität Heidelberg, 69120 Heidelberg, Germany
Strangeness production in heavy-ion collisions at intermediate energies
(1-2 AGeV) is believed to provide an insight into equilibration and the
change of hadron properties in a hot and dense nuclear medium. The
FOPI detector at SIS allows the indentification of K ± and, futhermore,
the reconstruction of K 0 , Λ 0 and φ by their charged decay products. In
January 2003 a high-statistics experiment (Ni+Ni, 1.93 AGeV) was performed
which aimed primarily at the understanding of (multi-) strange
particle production. About 10 5 Λ 0 can be reconstructed from the collected
data and allow sensitive tests of theoretical concepts. The talk
gives an overview of FOPI’s recent results on strangeness production in
the Ni+Ni system at 1.93 AGeV. In particular, complete phase-space
distributions of K 0 and Λ 0 are presented and strangeness balance is discussed
in the light of a surprisingly high Λ 0 yield. Limits on the production
of short-lived strange resonances (Ξ − , Σ(1385)) are given.
∗ supported by BMBF (06HD154) and GSI (HD-PEL)
Group Report HK 41.4 Thu 15:00 E
The Density Dependence of the Isovector EOS in Heavy Ion
Collisions ∗ — •H.H. Wolter 1 , Th. Gaitanos 1,2 , V. Baran 2,3 , M.
Colonna 2 , M. Di Toro 2 , and Chr. Fuchs 4 — 1 Sektion Physik,
Univ. of Munich — 2 Lab. Naz. del Sud, INFN, Catania — 3 NIPNE and
Bucharest Univ. — 4 Inst. Theor. Phys., Univ. Tübingen
The density dependence of the isovector equation-of-state of nuclear
matter is important for nuclear structure of rare isotopes, for heavy ion
collisions of asymmetric nuclei, and for astrophysical processes like neutron
star cooling of supernova nucleosynthesis. On the other hand it
is not well contrained from nuclear matter theories. Heavy ion collisions
offer the possiblility to explore the isovector eos for low densities
in fragmentation reactions and for high densities in flow phenomena and
particle production. Our invstigations of the high density eos are performed
in the framework of relativistic transport calculations, where in
the isovector sector the ρ and δ mesons enter, where the effect of the latter
is enhanced in heavy ion collisions. Different observables have been
investigated and will be discussed in comparison with the rather sparse
experimental data. These include flow observables v1, v2, pion production,
and ratios of p/n or 3 He/t emmissions, e.g. in the Ru/Zr system.
We see an observable sensitivity on the isovector eos, which suggests the
investigation of even more asymmetric heavy ion collision of radiactive
nuclei in the future.
∗ supported by BMBF, contract 06 LM 981.
HK 41.5 Thu 15:30 E
Φ-mesons measured in FOPI spectrometer — •Zbigniew Tyminski
— Gesellschaft für Schwerionenforschung, Darmstadt, Germany —
Warsaw University, Poland
Taking advantage of a high statistics data run with FOPI for the system
58 Ni+ 58 Ni at 1.93 AGeV the question of Φ meson production in HIcollisions
is revisited. From the reconstruction of the Φ invariant mass
from K + K − candidates, we find about 200 Φ mesons with a signal to
background of S/B=0.7 . This is enough to estimate the slope parameter
of the kinetic energy distribution in the CM frame and extract the total
yields. Combining the Φ yield with previously measured K − yield allows
to check the sensitivity of various reaction channels, as implemented in
transport models.
HK 41.6 Thu 15:45 E
High-resolution experiments on projectile fragments - A new
approach to the properties of hot and dense nuclear matter
— •A. Kelic 1 , J. Benlliure 2 , T. Enqvist 1 , V. Henzl 1 , D. Henzlova
1 , J. Pereira 2 , M. V. Ricciardi 1 , K.-H. Schmidt 1 , and O.
Yordanov 1 — 1 GSI - Darmstadt — 2 Univ. Santiago de Compostela,
Spain
Dedicated experiments on nucleus-nucleus collisions are the main
source of our knowledge on static and dynamic bulk properties of nuclear
matter. Most investigations have concentrated on the detection of
nucleons, produced particles and very light fragments in full-acceptance
experiments. We report on a recently developed complementary experimental
approach, which is based on precise measurements of the projectile
spectator. We make use of a high-resolution magnetic spectrometer,
which allows a very precise longitudinal momentum determination and
the full identification of all the detected fragments in A and Z. The new
approach gives access to nonlocal features of the nuclear EOS [1] and
represents an important progress in studying the influence of the N/Z
degree of freedom on the properties of nuclear matter [2]. It is discussed
in which way the information extracted from these experiments differs
from previous results. It is pointed out, how these experiments will profit
from the new installations planned in the future GSI project. [1] M. V.
Ricciardi et al., Phys. Rev. Lett. 90 (2003) 212302. [2] K.-H. Schmidt
et al., Nucl. Phys. A710 (2002) 157.

Nuclear Physics Thursday
HK 42 Nuclear and Particle Astrophysics III
Time: Thursday 13:30–16:00 Room: F
Group Report HK 42.1 Thu 13:30 F
Final Results of the LENS pilot phase — •Dario Motta 1 , Christian
Buck 1 , Francis Xavier Hartmann 1 , Thierry Lasserre 2 ,
Stefan Schönert 1 , and Ute Schwan 1 for the LENS collaboration —
1 Max Planck Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg
— 2 CEA/Saclay, DAPNIA/SPP,91191 Guf-Sur-Yvette, France
LENS (Low Energy Neutrino Spectroscopy) is a project aiming at the
real time, energy resolved and flavor specific measurement of low energy
solar neutrinos. A LENS prototype detector has been installed early in
2003 at the LLBF (Lens Low Background Facility) in the Gran Sasso
underground laboratories, Italy, and has been taking data in its final
configuration since October 2003. After briefly revising the motivations
and goals of the project, the most recent experimental achievements of
the the LENS R&D will be reported and special emphasis will be given to
the final results of the LLBF prototype, which conclude the LENS pilot
phase. The implications of this experimental studies for the feasibility of
the LENS concept for the measurement of the 7 Be and pp solar neutrinos
are discussed.
Group Report HK 42.2 Thu 14:00 F
Investigation of solid D2 for UCN sources — •Klaus Kirch 1 ,
F. Atchison 1 , K. Bodek 2 , B. van den Brandt 1 , T. Bry´s 1 ,
M. Daum 1 , P. Fierlinger 1 , P. Geltenbort 3 , M. Giersch 4 ,
P. Hautle 1 , M. Hino 5 , R. Henneck 1 , M. Kasprzak 2 , J.
Kohlbrecher 1 , J.A. Konter 1 , G. Kühne 1 , M. Ku´zniak 2 , K.
Mishima 6 , A. Pichlmaier 1 , D. Rätz 1 , A. Serebrov 1,7 , M.
Utsuro 6 , A. Wokaun 1 , and J. Zmeskal 4 — 1 PSI, Villigen, CH
— 2 JU Cracow, PL — 3 ILL Grenoble, FR — 4 IMEP Wien, AU —
5 KURRI, Kyoto, JP — 6 RCNP Osaka, JP — 7 PNPI Gatchina, RU
Solid deuterium (sD2) is a favourite converter material for the production
of ultra-cold neutrons (UCN) in the next generation of UCN
sources. Some of its critical neutronic properties still remain to be investigated.
Among these, the most important ones concern UCN scattering
cross sections which determine the extraction efficiency of UCN from sD2
and thus the source yield. These cross sections might depend on specific
conditions of a given sD2 sample and could possibly be influenced. An
apparatus for the preparation and characterization of solid deuterium
samples for neutron beam experiments with simultaneous optical control
has been built. We report first results from transmission and scattering
experiments with cold, very cold and ultra-cold neutrons on sD2 along
with light transmission and Raman scattering studies.
HK 42.3 Thu 14:30 F
Supernova Inelastic Neutrino-Nucleus Cross Sections and Magnetic
Dipole Response in Nuclei ∗ — •P. von Neumann-Cosel 1 ,
A. Byelikov 1 , R.W. Fearick 2 , K. Langanke 3 , G. Martinéz-
Pinedo 4,5 , and A. Richter 1 — 1 Institut für Kernphysik, Technische
Universität Darmstadt, Germany — 2 Department of Physics, University
of Cape Twon, South Africa — 3 Institute for Physics and Astronomy,
University of ˚Arhus, Denmark — 4 Institut d’Estudis Espacials de
Catalunya, Edifici Nexus, Barcelona, Spain — 5 Institució Catalana de
Recerca i Estudis Avançats, Barcelona, Spain
Inelastic neutrino-nucleus scattering can make significant contributions
to supernova dynamics and nucleosynthesis. Although it is not yet considered
in supernova simulations, a clear call has been made to determine
the relevant neutrino-nucleus cross sections, in particular on nuclei in the
iron mass range A ∼ 56. It is demonstrated here that precision M1 data,
obtained from high-resolution electron scattering for the spherical nuclei
50 Ti, 52 Cr and 54 Fe, can be translated into inelastic total and differential
neutrino-nucleus cross sections at supernova neutrino energies. The results
agree well with large-scale shell model calculations, validating this
model. Some data for a deformed case, 56 Fe [1], where the relation is
more complex, are also discussed.
[1] R.W. Fearick et al., Nucl. Phys. A 727 (2003) 41.
∗ Supported by DFG, contracts SFB 634 and 445 SUA-113/6/0-1, South
African FRD, Danish Research Council, Spanish MCyT, and EU ERDSF,
contracts AYA2002-04094-C03-02 and AYA2003-06128.
HK 42.4 Thu 14:45 F
Cross sections for ν-induced reactions on argon — •Edwin
Kolbe — Departement für Physik und Astronomie der Universität
Basel, Basel, Switzerland
We have calculated cross sections and branching ratios for neutrino
induced reactions on 40 Ar for various supernova and accelerator-relevant
neutrino spectra within a hybrid model. This was motivated by the fact
that argon is used as target material in neutrino detectors, like, e.g.,
ICARUS. In particular we study the neutral and charged current (CC)
cross sections on argon and calculate the neutron energy spectra following
the decay of the daughter nuclei. We also determined the angular
dependence of the CC cross sections for various energies of the incoming
(anti)neutrino.
HK 42.5 Thu 15:00 F
A New Experiment to Measure The Depolarization and
Loss Probability of UCN on Diamond Like Carbon (DLC)
— •Axel Pichlmaier 1 , T. Brys 1 , M. Daum 1 , P. Fierlinger 1 ,
P. Geltenbort 2 , M. Gupta 1 , R. Henneck 1 , K. Kirch 1 , M.
Makela 3 , A. Serebrov 1,4 , U. Straumann 5 , R. Vogelaar 6 , and
A. Young 7 — 1 Paul Scherrer Institut — 2 Institut Laue Langevin
— 3 Los Alamos National Laboratory — 4 Petersburg Nuclear Physics
Institut — 5 Universitaet Zuerich — 6 Virginia Tech — 7 North Carolina
State University
We are building an experiment to measure the properties of DLC for
the storage of ultra-cold neutrons (UCN). DLC is already widely used
in industry and does not exhibit the limitations of the materials currently
used for UCN storage and guide vessels (e.g. 58 Ni, Be, solid O2
and low temperature Fomblin oil). First experience with DLC in UCN
applications already exists: the depolarization has been measured by an
international collaboration (ILL, LANL, PNPI, VT) at the ILL, the critical
velocity was independently determined at LANL and PSI and found
to be around 7 m/s, similar to Be. Gravity and a magnetic field will be
used to trap the UCN in the sample volume, no material surfaces other
than DLC or Be will be seen by the UCN. A Be coated sample will be
used for comparison. The setup is built following UHV procedures. It
will be possible to cool it down to 40 K and bake it at up to 400 K. We
will be able to extract the numbers for the loss and the depolarization
coefficient simultaneously. A detailed overview of the experimental setup
and of the expected results will be given.
HK 42.6 Thu 15:15 F
New ultra–low background Ge-detector for M-Cavern at Gran
Sasso — •G. Rugel 1 , F.X. Hartmann 1 , G. Heusser 1 , M. Keillor
1 , M. Laubenstein 2 , and S. Schönert 1 — 1 Max-Planck-Institut
für Kernphysik, Postfach 103980, D-69029 Heidelberg — 2 INFN, Laboratori
Nazionali del Gran Sasso, I-67010 Assergi, Italy
We will report on the progress of the design and construction of a
new ultra–low background HPGe detector. This detector will be located
at a new low–level research facility (M-Cavern) at the Gran Sasso underground
laboratory. This spectrometer builds upon MPIK experience
with GeMPI [1].
Research sponsored by MPG, MPI für Kernphysik, Heidelberg and
ONL/NRL (Dr. F.Giovanne).
[1] H.Neder, G.Heusser and M.Laubenstein, App.Rad.andIso.
53(2000), 191
HK 42.7 Thu 15:30 F
Octupole correlations in the N 88 region — •M. Babilon 1,2 , N. V.
Zamfir 1 , R. F. Casten 1 , E. A. Ricard-McCutchan 1 , D. Kusnezov
1 , W. Bayer 2 , D. Galaviz 2 , and A. Zilges 2 — 1 Yale University
— 2 Technische Universitaet Darmstadt
An extensive study of the negative parity states in the even-even nuclei
in the Z 56-64, N 88 region was performed in the framework of the
Interacting Boson Approximation (IBA) model. This region was predicted
to present strong octupole correlations and, by incorporating the
p and f bosons in the usual IBA-sd model, the character of the octupole
excitations was studied. The predictions for the negative parity states
were extensively compared with the existing data. More experimental
information is needed to understand the octupole collectivity in these
nuclei. To obtain such information negative parity states in 152 Gd were

Nuclear Physics Thursday
populated via β-decay and studied via off-beam coincidence γ-ray spectroscopy
at the Moving Tape Collector of the Wright Nuclear Structure
Lab (Yale University). A comparison between the experimental results
and spdf-IBA calculations will be given. This work was supported by the
U.S. DOE Grant No. DE-FG02-91ER-40609.
HK 42.8 Thu 15:45 F
Diffusive shock acceleration at oblique shocks — •Athina Meli
and Peter Biermann — Max Planck Institut fuer Radioastronomie,
Auf dem Huegel 69, 53121, Bonn, Germany
Our aim here is to evaluate the rate of the maximum energy and the acceleration
rate that particles acquire in the non-relativistic diffusive shock
acceleration as it could apply during their lifetime in various astrophys-
HK 43 Nuclear Structure/Spectroscopy VII
ical sites. We examine numerically (using Monte Carlo simulations) the
effect of the diffusion coefficients on the energy gain and the acceleration
rate, by testing the role between the obliquity of the magnetic field at
the shock normal, and the significance of both perpendicular (cross-field
diffusion) and parallel diffusion coefficients. We find (and justify previous
analytical work) that if there is a highly oblique shock, the smaller the
perpendicular diffusion gets compared to the parallel diffusion coefficient
values, the greater the energy gain of the cosmic rays to be obtained.
An explanation of the cosmic ray spectrum between 10 and 10 18 eV is
claimed, as we estimate the upperlimit of energy that cosmic rays could
gain in the plausible regimes where conditions such as magnetic obliquity
and diffusion coefficients ‘limited’ ratio and -most importantly- time
limitsshould apply.
Time: Thursday 16:30–19:00 Room: A
Group Report HK 43.1 Thu 16:30 A
Photon scattering from heavy nuclei up to energies well above
particle emission thresholds — •A. Wagner 1 , F. Dönau 1 , M. Erhard
1 , E. Grosse 1,2 , A.R. Junghans 1 , K. Kosev 1 , G. Rusev 1 ,
K.D. Schilling 1 , and R. Schwengner 1 — 1 Institut für Kern- und
Hadronenphysik, Forschungszentrum Rossendorf, Dresden, Germany —
2 Technische Universität Dresden, Dresden, Germany
Bremsstrahlung facilities at low-energy electron accelerators have delivered
a large number of very interesting results on nuclear resonance
fluorescence (NRF) via bound states. Comparatively few results have
been reported on photon scattering from heavy nuclei at energies above
particle emission thresholds. At the new superconducting electron accelerator
ELBE at Dresden - Rossendorf various efforts on the identification
and reduction of background in NRF photon spectra were successful such
that reasonably clean spectra could be accumulated even at endpoint energies
above the giant dipole resonance (GDR). The dipole strength distribution
below and in the GDR of 208 Pb and in the threshold region of
the Mo-isotopes can be extracted from the data; the good energy resolution
in the Ge-detectors (∼ 7 keV) allows to also study its fine structure.
Such hitherto unknown experimental information is to be compared to
RPA-calculations as well as to the continuum shell model.
Group Report HK 43.2 Thu 17:00 A
Nuclear matrix elements for two-neutrino double-beta decay
— •S. Rakers 1 , C. Bäumer 1 , A. van den Berg 2 , B. Davids 2 , D.
Frekers 1 , D. De Frenne 3 , E.-W. Grewe 1 , P. Haefner 1 , M.N.
Harakeh 2 , M. Hunyadi 2 , E. Jacobs 3 , H. Johansson 4 , A. Korff
1 , A. Negret 3 , L. Popescu 3 , H. Simon 4 , and H.J. Wörtche 2
— 1 Institut für Kernphysik, Westfälische Wilhelms-Universität Münster,
D-48149 Münster, Germany — 2 Kernfysisch Versneller Instituut, Rijksuniversiteit
Groningen, NL-9747 AA Groningen, The Netherlands —
3 Vakgroep Subatomaire en Stralingsfysica, Universiteit Gent, B-9000
Gent, Belgium — 4 Gesellschaft für Schwerionenforschung mbH, D-64291
Darmstadt, Germany
Two-neutrino double-beta (2νββ) decay represents a test-case for our
knowledge about the nuclear structure of the involved isobars. The nuclear
matrix element relevant for ββ decay can be calculated, if the complete
set of Gamow-Teller (GT) matrix elements for the two virtual transitions
in the perturbative description are known. Using the 180 MeV
deuteron beam at KVI Groningen, we have employed the high-resolution
(d, 2 He) probe to measure the GT + strength distributions in 48 Sc and
116 In. These are the intermediate nuclei in the 48 Ca and 116 Cd ββ decays.
By combining our measured GT distributions with the data from a
48 Ca(p,n) and a 116 Cd( 3 He,t) experiment [1,2], respectively, we can now
compute the double GT matrix element and deduce the 2νββ half-life
solely from measured nuclear structure data. [1] B.D. Anderson et al.,
Phys. Rev. C 31, 1161 (1985).
[2] H. Akimune et al., Phys. Lett. B 394, 23 (1997).
HK 43.3 Thu 17:30 A
Complete study of Gamow-Teller strength starting from 64Ni
— •Lucia-Ana Popescu and D. De Frenne — Dep. of Subat. and
Rad. Phys., Ghent University
We used the complementary reactions (d,2He) and (3He,t) on 64Ni in
order to study the Gamow-Teller (GT) strength distributions in 64Co and
64Cu. The 64Ni(d,2He)64Co experiment was performed at the AGOR
cyclotron of the KVI, Groningen, with Ed=170MeV, using the EuroSuperNova
detector at the Big-Bite Spectrometer. An energy resolution of
about 100 keV was achieved. In addition to the ground-state (gs) with
J π = 1 + , several other GT states could be identified and the strengths
of them were determined. The complementary reaction 64Ni(3He,t)64Cu
was performed at E3He=420MeV at RCNP, Osaka. An energy resolution
of 35keV was achieved. Many GT candidate states were identified.
The isospin of the 64Ni gs is T0=4 while the isospin of the gs of 64Co
and 64Cu are T=T0+1=5 and T=T0-1=3, respectively. In the (3He,t)
reaction the T=3, T=4 and T=5 components of the isospin are excited.
The T=5 component is very much suppressed in (3He,t) but it can be
studied in detail in the (d,2He) reaction. Combining these information
we can study the GT strengths starting from 64Ni in a complete manner.
The gs of both 64Co and 64Cu have J π = 1 + , making the determination
of absolute B(GT) values to these states from beta-decay possible.
The unit cross sections determined in these experiments provide a very
important calibration standard for the fp-shell region. The analysis is in
progress. Preliminary results will be presented.
HK 43.4 Thu 17:45 A
Gamow Teller strengths in beta+ and beta- directions starting
from the ground state of 14N — •Alexandru Negret and Denis
De Frenne — Universiteit Gent, Belgium
Although all the quantum numbers involved in the beta decay of
14C and 14O to the ground state of 14N (1+, T=0) suggest a Gamow
Teller character, these transitions are strongly hindered. Theoretically
[S. Aroua et al., Nucl.Phys. A720, 71 (2003)], the structure of the ground
state of 14N seems to favor the transition to one 2+ state rather than to
the 0+ or 1+ excited states in the final nuclei. This experimental study
is addressing the issue of the Gamow Teller strength distribution starting
from the ground state of 14N to the final excited states of 14C and
14O. An 14N(d,2He)14C experiment has been performed at the KVI-
Groningen with the ESN setup and an 14N(3He,t)14O study has taken
place at the RCNP-Osaka. We found that, indeed, in both cases, the g.s.
- g.s. transitions are strongly hindered, while the strength is going mainly
to three 2+ excited states. However, the fragmentation of the Gamow-
Teller strengh over three 2+ excited states remains an open question for
the theory. The striking similarities of the two resulting spectra (14C and
14O) observed in these two mirror experiments illustrate a good isospin
symmetry.
HK 43.5 Thu 18:00 A
Total-absorption spectroscopy studies of the 103,105 Sn β-decay
— •M. Kavatsyuk for the GSI-ISOL collaboration — GSI Darmstadt,
Planckstr. 1, 64291 Darmstadt
Studies in the 100 Sn region offer a possibility to test nuclear models
describing structure and decay properties of nuclei in which protons and
neutrons occupy identical orbitals near a shell closure. The β-decay in
this region is dominated by an allowed Gamow-Teller (GT) transition
πg9/2 → νg7/2. Dominant GT resonances were identified in the decay of
103,105 Sn by using the total-absorption spectrometer (TAS) at the GSI-
ISOL facility. Using the TAS for the investigation of the β + /EC decay
enables one to detect the direct population of states in the daughter
nucleus. In particular high-lying, closely spaced and weakly populated
states in the daughter are accessible. The GT strength distributions were

Nuclear Physics Thursday
measured for 103,105 Sn, the preliminary values for their maxima being 3.6
and 2.4 MeV and for the summed strength 3.3 and 2.6, respectively.
The results will be discussed in comparison to data from high-resolution
spectroscopy and to shell-model predictions.
HK 43.6 Thu 18:15 A
The WITCH Experiment — •M. Beck 1 , F. Ames 2 , D. Beck 3 , S.
Coeck 1 , P. Delahaye 2 , B. Delauré 1 , V.V. Golovko 1 , C. Guenaut
4 , V.Yu. Kozlov 1 , A. Lindroth 1 , I.S. Kraev 1 , T. Phalet 1 ,
N. Severijns 1 , and S. Versyck 1 — 1 Katholieke Universiteit Leuven,
Celestijnenlaan 200D, B-3001 Leuven — 2 CERN, CH-1211 Geneva,
Switzerland — 3 GSI-Darmstadt, Postfach 110552, D64220 Darmstadt,
Germany — 4 Centre de Spectrométrie Nucléaire et de Spectrométrie de
Masse, F-91405 Orsay, France
The WITCH experiment will measure the energy spectrum of the recoil
ions after β-decay with the aim to test the Standard Model of the
electroweak interaction. A first measurement will take place in 2004.
Initially, a search for scalar (S) interaction will be performed. In this
presentation an overview over present searches for S-interaction will be
given and the experimental principle of the WITCH experiment will be
described. In addition, other prospective physics topics that can be investigated
with the WITCH experiment will be discussed. These include,
among others, measurements of weak magnetism and the determination
of Q-values and of EC/β + branching ratios. Details of the experimental
setup will be described in other presentations during this meeting.
HK 43.7 Thu 18:30 A
Studies of the l-forbidden ground state transition in
32 S(d, 2 He) 32 P. — •E.-W. Grewe 1 , C. Bäumer 1 , A. van den
Berg 2 , B. Davids 2 , D. Frekers 1 , D. de Frenne 3 , P. Haefner 1 ,
M.N. Harakeh 2 , M. Hunyadi 2 , E. Jacobs 3 , B. Junk 1 , A.
Korff 1 , A. Negret 3 , P. von Neumann-Cosel 4 , L. Popescu 3 ,
S. Rakers 1 , and H.J. Wörtche 2 — 1 Institut für Kernphysik,
Westfälische Wilhelms Universität Münster,D-48149 Münster, Germany
— 2 Kernfysisch Versneller Instituut, Rijksuniversiteit Groningen,
NL-9747 AA Groningen, The Netherlands — 3 Vakgroep Subatomaire
en Stralingsfysica, Universiteit Gent, B-9000 Gent, Belgium — 4 Institut
für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt,
Germany
Two of the most hindered allowed beta decays in sd-shell nuclei are
those for the mirror decays of the J π =1 + ground states of 32 P and 32 Cl
to the ground state of 32 S. In the simple shell-model this is described as a
1d3/2 → 2s1/2 transition and it may therefore be the best case for a study
of l-forbidden strength towards the middle of the sd-shell. We employed
the (d, 2 He)-probe to measure the l-forbidden 0 + → 1 + transition strength
to the g.s. of 32 P. The reaction calculation using DWBA and USD-wave
functions reveals that the transition to the 32 P g.s. is not governed by
the central Vστ term, but rather dominated by the tensor force. A small
contribution from the GT operator due to g.s. correlations gives rise to a
B(GT + ) = (2.7±1.3)×10 −4 . This value leads to log ft = 7.7±0.3, which
is in agreement with the result from 32 P β-decay, log ft = 7.9.
The (d, 2 He)-probe was compared to (p,n), (p,p ′ ) and (e,e ′ ) data and
the A=32, J π = 1 + isospin triplet structure was deduced.
HK 43.8 Thu 18:45 A
Properties of the first excited K π = 0 + band in 160 Dy — •G.
Gersch 1 , J. Eberth 1 , C. Günther 2 , H. Hess 1 , I. Stefanescu 1 , T.
Steinhardt 1 , O. Thelen 1 , N. Warr 1 , and D. Weisshaar 1 for the
collaboration — 1 Institute for nuclear physics, University of Cologne,
Germany — 2 Helmholtz-Institut für Strahlen- und Kernphysik, University
of Bonn, Germany
The nucleus 160 Dy was studied in the β-decay of 160 Er using the highly
efficient MINIBALL spectrometer. The main aim of the investigation was
to identify a possible decay of the lowest excited K π = 0 + band to the γ
band. Calculations within the IBA model predict energy and strength of
this decay [1]. In spite of the excellent quality and statistics of the data
no candidate for the postulated decay could be found. The upper limit
of the intensity of such a transition was estimated to be 0.024% of the
intensity of the 197 keV transition of the γ band. These results do not
support the interpretation of the first excited K π = 0 + band as a phonon
excitation of the γ band [1].
The good quality of the data allowed to extend the level scheme of
160 Dy by 24 new levels and 98 new γ-transitions and identify a number
of wrong assignments published in the literature.
[1] R.F. Casten and P. von Brentano, Phys. Rev. C 50, R1280 (1994).
HK 44 Electromagnetic and Hadronic Probes VII
Time: Thursday 16:30–19:00 Room: B
Group Report HK 44.1 Thu 16:30 B
Evidence for a narrow |S| = 1 baryon state at a mass of 1527
MeV in quasi-real photoproduction — •Klaus Rith for the HER-
MES collaboration — Universität Erlangen-Nürnberg, Physikalisches
Institut II, Erwin-Rommel-Str. 1, 91058 Erlangen
The HERMES experiment at HERA has searched for a narrow baryon
state in quasi-real photoproduction on a deuterium target through the
decay channel pK 0 s → pπ + π − . A peak has been observed in the pK 0 s invariant
mass spectrum at 1527±2.3(stat)±1.7(syst) MeV with a width of
about 21 MeV that is substantially larger than the experimental resolution
of 10-15 MeV. The peak has a naive statistical significance of 5−6 σ,
depending on the background model. This state may be interpreted as
the predicted S = +1 exotic Θ + (uudd¯s) pentaquark baryon. No signal
for an hypothetical Θ ++ baryon was observed in the pK + invariant mass
distribution.
Supported by BMBF, contract numbers 06 ER 125I, 06 ER 928I
Group Report HK 44.2 Thu 17:00 B
Hyperonproduction and the search for a pentaquark state at
COSY-TOF ∗ — •Wolfgang Eyrich for the COSY-TOF collaboration
— Physikalisches Institut der Universität Erlangen-Nürnberg
The associated strangeness production in elementary nucleon-nucleon
induced reactions is studied exclusively using the spectrometer COSY-
TOF. The complete reconstruction of all charged particle tracks allows
the extraction of total and differential cross sections and Dalitz plots
as well. The design of the COSY apparatus provides the opportunity to
cover the full phase space of the reactions from threshold up to the COSY
energy limit. Especially the reaction channel pp → K + Λp was investigated
recently in detail with high statistics and delivered precise results
which show strong N ∗ and FSI contribution. Alongside Λ-production,
the production of Σ-hyperons is a further point of interest within the associated
strangeness production. Both production channels, Σ 0 and Σ + ,
have been measured. Moreover the reaction channels pp → K 0 Σ + p and
pp → K + Σ + n are of high interest due to a possible exotic pentaquark
resonance which might contribute to the production mechanisms.
This talk will focus on the recent results of the TOF experiment on
Λ- and Σ-production, especially discussing the strong energy-dependent
influence of the 1650 and 1710 N ∗ resonances in the Λ-production channel.
Moreover the status of the search for an exotic pentaquark state is
presented, where the preliminary analysis of the pp → K 0 Σ + p data at a
beam momentum of 2.95 GeV/c show evidence for a narrow enhancement
in the K 0 p invariant mass spectrum around 1530 MeV/c.
∗ Supported by BMBF and FZ Juelich
HK 44.3 Thu 17:30 B
Search for the Θ + (1530) in the reaction γp → pK 0 S(K 0 ) missing with
the CB/TAPS-experiment at ELSA — •Harald van Pee for the
CB/TAPS@ELSA collaboration — II. Physikalisches Institut, Heinrich-
Buff-Ring 16, 35392 Giessen
Recently a narrow baryon state with S=+1 has been observed by
various experiments. A narrow pentaquark state at the corresponding
mass has been predicted within the chiral soliton model [1]. With
the CB/TAPS-experiment at ELSA we have searched for the Θ + in
γp → pK 0 S(K 0 ) missing → pπ 0 π 0 (K 0 ) missing → p4γ(K 0 ) missing. Using an electron
beam of 3.3GeV, tagged photons from threshold up to 3.1GeV
are available. The 4 photon final state was detected with the Crystal
Barrel/TAPS detector which provides an almost 4π-coverage for photon
detection. In the p4γ final state we clearly observe γp → pπ 0 π 0 and
pπ 0 η, asking in addition for a missing K 0 evidence for ¯K 0 Θ + , pK 0 S K0 L
and π 0 K 0 Σ + (1189) is expected. A preliminary analysis shows indeed

Nuclear Physics Thursday
indications for all these reactions; an enhancement of events in the Θ +
mass region has been observed.
[1] D. Diakonov, V. Petrov and M. Polyakov, Z. Phys. A 359, 305 (1997)
HK 44.4 Thu 17:45 B
Search for the Θ + (1530) in the reaction γp → K 0 Θ + → p4π 0
— •Mariana Nanova for the CB/TAPS@ELSA collaboration — II.
Physikalisches Institut, Heinrich-Buff-Ring 16, 35392 Giessen
The recently discovered Θ + (1530) pentaquark state [1,2,3] has been
searched for in the reaction γp → K 0 Θ + → K 0 s pK0 s → p4π0 . The experiment
has been performed at the tagged photon facility of the ELSA
accelerator (Bonn), using photons in the energy range up to 3.5 GeV. The
8 photon final state is detected in the Crystal Barrel and TAPS detector
system which provides an almost 4π coverage for photon detection. The
analysis has been checked by studying known reactions leading to the
same final state, i.e. γp → pπ 0 η → p4π 0 ; γp → K 0 π 0 Σ + (1189) → p4π 0 ;
γp → K 0 K 0 p → p4π 0 . Data have been taken using lineary polarised photons
with the polarisation peak at 1950 MeV. The status of the ongoing
analysis will be reported.
[1] D. Diakonov, V. Petrov and M. Polyakov, Z. Phys. A 359, 305 (1997)
[2] T. Nakano et al.[LEPS Collaboration], Phys. Rev. Lett. 91 (2003)
[3] S. Stepanyan et al. [CLAS Collaboration], arXiv:hep-ex/0307018
HK 44.5 Thu 18:00 B
Compatibility of a θ + (1540) resonance with K + N data —
•Johann Haidenbauer 1 and Gastão Krein 2 — 1 Forschungszentrum
Jülich, IKP, 52425 Jülich — 2 Universidade Estadual Paulista, São
Paulo, Brazil
Recently experimental indications have been found for the existence
of a narrow baryon resonance with strangeness S = +1. The resonance
parameters extracted from these experiments (mass around 1540 MeV
and width around 20 MeV), lie convincingly close to a pentaquark state
with the quantum numbers I = 0, JP = 1+
predicted by Diakonov et al.
2
within their chiral quark-soliton model.
We examine the impact of a θ + (1540) resonance with a width of 20
MeV or less on the K + N (I = 0) elastic cross section and on the P01
phase shift within the KN meson-exchange model of the Jülich group
[1]. It is shown that the rather strong enhancement of the cross section
caused by the presence of a θ + with the above properties is not compatible
with the existing empirical information on KN scattering. Only a
much narrower θ + state could be reconciled with the existing data – or,
alternatively, the θ + state must lie at an energy much closer to the KN
threshold [2].
[1] M. Hoffmann et al., Nucl. Phys. A593, 341 (1995).
[2] J. Haidenbauer et al., hep-ph/0309243
HK 44.6 Thu 18:15 B
Photo- and electroproduction of pentaquark on deuterium
— •Vadim Guzey 1 and Maxim Polyakov 2 — 1 Ruhr-Universität
Bochum, Univesität Str., 150 — 2 Liege University, Belgium
HK 45 Instrumentation and Applications VI
After initial reports about the discovery of the exotic pentaquark
state Theta+, a new generation of high precision dedicated experiments
will study particular properties of Theta+ such as parity, spin and
isospin. We examine various mechanisms of photo and electroproduction
of Theta+ on deuterium with a particular emphasize on the strangeness
tagging process gamma+D -¿ Lambda + Theta+. We calculate the rate
of this and similar reactions in the kinematics of SPRING-8, JLab, ELSA
and GRAAL. We estimate the possible background and conclude that
there is kinematics where the signal extraction from the data is possible
with high precision.
HK 44.7 Thu 18:30 B
Analysis of D×π¦and D×π + π Systems — •Marc Pelizäus for
the BABAR collaboration — Institut für Experimentalphysik I, Ruhr-
Universität Bochum, Universitätsstr. 150, 44780 Bochum
The BABAR experiment located at the asymmetric e + e − collider PEP-
II at SLAC has recorded a data sample corresponding to an integrated
luminosity of 150 fb −1 since 1999. In April 2003 BABAR found the new
narrow resonance D ∗ sJ (2317)± in D ± s π0 system.
Several suggestions for the classification of this new state below DK
threshold are discussed at the moment, one is the interpretation of the
D ∗ sJ(2317) ± as an exotic DK bound state. The investigation of D ± s π ± ,
D ± s π ∓ and D ± s π + π − could contribute to this discussion. The analysis of
these systems is described.
Supported by bmb+f (06BO9041).
HK 44.8 Thu 18:45 B
Deeply Virtual Compton Scattering at HERMES — •B.
Krauss 1,2 , R. Shanidze 1,2 , J. Volmer 3 , F. Ellinghaus 4 , and
J. Lu 5 for the HERMES collaboration — 1 Physikalisches Institut,
Universität Erlangen — 2 supported by BMBF under contract number 06
ER 125 I — 3 Deutsches Elektronensynchrotron, Zeuthen — 4 University
of Colorado, Boulder, USA — 5 TRIUMF, Vancouver, Canada
HERMES is a multi-purpose fixed-target experiment at HERA that
studies scattering of the polarized 27.6 GeV lepton beam on internal
gas targets of polarized and unpolarized hydrogen and deuterium or unpolarized
heavy gases like nitrogen, neon and krypton. The HERMES
spectrometer allows tracking, momentum determination, particle identification
and calorimetry of the forward reaction products.
Apart from measurements of the spin-dependent structure functions
and quark distributions, the apparatus also allows the investigation of
hard exclusive reactions in which only one meson or photon has been
created in the final state. These exclusive reactions can be related to
Generalized Parton Distributions (GPDs) of the nucleon.
At HERMES the production of single photons can be due to ordinary
Bremsstrahlung as well as to Deeply Virtual Compton Scattering
(DVCS) on single quarks inside the nucleon. The interference of the two
processes leads to helicity and charge asymmetries. The present status
of the analysis will be presented.
Time: Thursday 16:30–19:00 Room: C
Group Report HK 45.1 Thu 16:30 C
Highest Polarizations in Deuterated Solid State Target Materials
— •Stefan Goertz, Jörg Heckmann, Werner Meyer, Eric
Radtke, and Gerhard Reicherz — Institut für Experimentalphysik
I, Ruhr-Universität Bochum, 44780 Bochum
Unlike the proton, which can be almost completely polarized even at
temperatures as high as 1 K, achieving a high polarization in a deuteron
system is a much more complicated task. The reason for that is the
much lower magnetic moment of the deuteron in comparison to that of
the proton. Since the nuclear polarization is determined by the ratio
of the magnetic to the thermal energy, the only way to further enhance
the deuteron polarization consists in reducing the effective temperature
seen by the nuclei. Speaking in terms of the spin temperature theory,
the nucleon Zeeman temperature has to be minimized. This can be done
most effectively by using paramagnetic centers, which experience only a
weak non-Zeeman interaction. In alcohols or diols such centers can be
provided by either an irradiation with ionizing particles or by chemical
doping with radicals of the trityl family. Both methods led to a substantial
improvement of the maximum polarization in deuterated butanol.
Maximum polarizations of about 80% have recently been measured in
trityl-doped D-butanol and D-propanediol.
HK 45.2 Thu 17:00 C
Nuclear Polarization Measurement of H/D atoms extracted
from a Storage cell with a Lamb-shift Polarimeter — •Ralf Engels
1 , Reinhard Emmerich 2 , Kyrill Grigoriev 3 , Jürgen Ley 2 ,
Maxim Mikirtytchiants 3 , Frank Rathmann 1 , Hans Paetz gen.
Schieck 2 , Hellmut Seyfarth 1 , and Alexandre Vassiliev 3 for the
ANKE collaboration — 1 Institut für Kernphysik, Forschungszentrum
Jülich — 2 Institut für Kernphysik, Universität zu Köln — 3 St. Petersburg
Nuclear Physics Institute
The occupation numbers of the individual hyperfine substates in a
beam of hydrogen or deuterium atoms are measured with a Lamb-shift
polarimeter (LSP). Therefore, the nuclear polarization of an atomic beam
can be determined with high precision of ∼ 1% within 20 s. The measurements
are carried out with the atomic beam source for the polarized
target at ANKE (I ∼ 7 · 10 16 atoms/s). The polarization of a slow (500
- 2000 eV) ion beam with currents higher than 2 nA can be measured as

Nuclear Physics Thursday
well. If the intensity of the atomic beam is reduced by a factor of 100,
the statistical error increases, but the Lamb-shift polarimeter still provides
a precise measurement. Therefore, it seems possible with some new
improvements of the LSP to use only a small fraction of atoms effused
from a polarized storage cell gas target to determine the polarization of
the atoms inside the cell. First results obtained by a simple teflon cell, a
new ionizer with an internal getter pump, a new designed wienfilter and
a new photomultiplier are presented. Planned studies to optimize the
polarization measurement are discussed as well.
Supported by FZ Jülich and BMBF.
HK 45.3 Thu 17:15 C
Status of the ANKE pellet target ⋆ — •P. Fedorets 1 , V. Balanutsa
1 , W. Borgs 2 , M. Büscher 2 , A. Bukharov 3 , V. Chernetsky
1 , V. Chernyshev 1 , M. Chumakov 1 , A. Gerasimov 1 , V. Goryachev
1 , L. Gusev 1 , and S. Podchasky 1 for the ANKE collaboration
— 1 ITEP, Moscow, Russia — 2 Forschungszentrum Jülich, Germany —
3 MPEI, Moscow, Russia
The use of frozen micro spheres (“pellets”) of solid hydrogen or deuterium
offers new possibilities for high luminosity experiments at internal
accelerator beams. A pellet target is under construction at COSY-Jülich
to study meson production in pp, pn, pd and dd collisions. It is expected
that luminosities higher than L = 10 32 cm −2 s −1 can be obtained and,
consequently, processes with cross sections in the sub-nb regime can be
studied. In a pellet target, a jet of liquid hydrogen is produced inside a
cryogenic chamber, the temperature of which is kept close to the triple
point value (Ttr=14 K, ptr∼100 mbar for hydrogen) with an accuracy of
better than 0.1 K. The liquid hydrogen jet is broken into microdroplets
by acoustic excitation. During flight into the accelerator vacuum the
droplets freeze and a continuous flow of frozen hydrogen pellets with diameters
down to ∼ 20µm is generated. The status of the ANKE pellet
target and the results of first tests on pellet production will be present.
⋆ Supported by FZJ, BMBF, DFG, RFFI, FFI.
HK 45.4 Thu 17:30 C
A superconducting magnetic UCN trap for precise neutron
lifetime measurements — •Rüdiger Picker, Igor Altarev,
Johannes Bröcker, Andreas Frei, Andreas Gschrey, Erwin
Gutsmiedl, F. Joachim Hartmann, Stephan Paul, Gerd
Petzoldt, Wolfgang Schott, Daniele Tortorella, and
Oliver Zimmer — Physik-Department E18, Technische Universität
München
The measurement of the neutron lifetime τn opens the way to determine
the coupling constants of weak interaction and hence the element Vud of
the CKM matrix precisely. Latest experimental results indicate this matrix
to deviate from unitarity by about 3σ. The most precise measurements
of τn were performed by storing ultra-cold neutrons (UCN) in material
bottles. There are, however, significant losses during wall collisions
whose nature is not yet fully understood. Therefore systematical errors
cannot be decreased much below their present values. Magnetic storage
has recently been proven to be a viable alternative. In our planned experimental
setup the volume between two nested cylinders made from
magnetic multipole fields is used to store UCN. The field is produced by
superconducting coils with the gravitational field playing the role of the
upper lid of the bottle. τn shall be measured by real-time detection of
decay protons as well as by counting the integral number of neutrons after
a predetermined storage time. Using a new high-density UCN source
we expect to store up to 10 8 neutrons per cycle. We thus envisage an
accuracy for τn of 10 −4 . The design of the experiment will be presented
and possible sources of systematical errors will be discussed.
Supported by Maier-Leibnitz-Laboratorium and BMBF.
HK 45.5 Thu 17:45 C
TRAP - a fast tracking processor for the ALICE TRD —
•Venelin Angelov for the ALICE TRD collaboration — Kirchhoff
Institute of Physics, University of Heidelberg, Germany
The ALICE Transition Radiation Detector (TRD) consists of 6 layers
of drift chambers and radiators, arranged in a barrel geometry in the
central part of the ALICE heavy-ion experiment at LHC. It is designed
to track charged particles and to perform electron identification. In addition,
it has the capability to provide a fast electron trigger within 6µs
after the collision. The charges induced on the 1.2 million pads are converted
to voltage pulses with a charge sensitive PreAmplifier and Shaping
Amplifier (PASA). A second chip - the TRAcklet Processor (TRAP) digitizes
the outputs from the PASA with 10 bit at 10 MHz. The position of
each charge cluster can be calculated using the charge sharing between
neighbouring pads. About 20 samples are taken for each track. The
momenta are obtained from the track parameters by performing straight
line fits. The TRAP chip contains the ADCs, digital filters, preprocessor,
and four RISC CPUs running at 120 MHz along with their instruction
and data memories, serial configuration interface and fast readout tree
merger. Both chips, PASA and TRAP, are implemented on low cost custom
multichip module for 18 analog channels, which looks like a standard
ball grid array device. Results will be present from working prototype
chips.
HK 45.6 Thu 18:00 C
Position Resolution, Electron Identification and Transition
Radiation Spectra with Prototypes of the ALICE TRD
— •Christian Lippmann for the ALICE TRD collaboration
— Gesellschaft für Schwerionenforschung, Planckstr. 1, D-64291
Darmstadt, Germany
The ALICE TRD trigger performs online tracking and electron identification
and thus requires excellent position resolution and pion rejection.
The emission of X-ray transition radiation photons allows to discriminate
electrons from pions. A high-Z gas mixture (Xe, CO2 15%) is used to
provide an efficient photon absorption. The drift chambers are equipped
with cathode pads and charge sharing between adjacent pads allows to
reconstruct the position of the cluster along a pad row. The drift time is
sampled in 20 time intervals of 100ns (w 1.5mm) such that two dimensional
track reconstruction can be performed.
We tested a stack of four identical small drift chamber prototypes including
radiators at the secondary beam facility at the CERN PS. We
present the measured momentum dependence of position resolution, angular
resolution and electron identification for momenta between 1 and
6 GeV/c, including measurements in a magnetic field. The measured
results are well within the design goals. They are compared to (and well
reproduced by) simulations based on AliRoot, the ALICE software package.
We also discuss the influence of a space charge effect on the results.
Moreover, we present our first measurement of the pure transition radiation
spectrum produced by our specific radiators. A comparison to
simulations at fixed momenta shows good agreement.
HK 45.7 Thu 18:15 C
Precision measurement of the electron drift velocity in NeCO2
— •Jens Wiechula 1 , G. Augustinski 2 , P. Braun-Munzinger 2 ,
H.W. Daues 2 , U. Frankenfeld 2 , C. Garabatos 2 , P. Glässel 3 ,
J. Hehner 2 , R. Renfordt 1 , H.R. Schmidt 2 , H. Stelzer 2 , D.
Vranic 2 , and B. Windelband 3 — 1 Institut für Kernphysik, Universität
Frankfurt — 2 Gesellschaft für Schwerionenforschung , Darmstadt
— 3 Universität Heidelberg
The Time Projection Chamber (TPC) [1] is the central detector of
the ALICE experiment at the Large Hadron Collider at CERN. It allows
a 3-dim reconstruction of charged particle tracks, where one dimension
is given by the electron drift time in the counting gas (NeCO2 90:10).
Therefore understanding the dependence of the electron drift velocity
on the gas parameters (CO2-content, temperature, oxygen and nitrogen
impurities) is essential for the space and momentum resolution of the
detector. This, in return, gives certain requirements for the temperature
and gas mixture stability as well as for the leak rate of the detector.
To measure the drift velocity with high precision a small drift chamber
was build. In the setup two collimated LASER-beams ionize the
gas. This has the advantage that the distance of the ionized tracks is
reproduceable and well controllable. In addition the gas parameters are
measured with the required precision.
Results of the drift velocity measurements investigating the dependence
on the above parameters will be presented and compared with
GARFIELD calculations. The obtained resolution is on the ◦ /◦◦ level.
[1]TPC Technical Design Report, CERN/LHCC 2000-001
HK 45.8 Thu 18:30 C
First Experience with the NA60 Pixel Telescope in In-In collisions
at 158 A GeV — •Karoly Banicz — Physikalisches Institut
der Universität Heidelberg
The NA60 experiment studies the production of open charm and
prompt dileptons in proton-nucleus and nucleus-nucleus collisions at the
CERN SPS. To access the kinematics of charged particles already at the
vertex level, NA60 uses 12 planes of radiation tolerant silicon pixel detectors
placed in a 2.5 T magnetic field near the target. During the six weeks
of the 2003 run with a 158 GeV/nucleon In beam on In targets, the pixel

Nuclear Physics Thursday
detectors were exposed to a fluence of up to a few times 10 12 neq/cm 2 .
Radiation induced effects in the silicon sensors had to be taken into consideration
in the design and operation of the pixel detectors. Special
measures were also taken to ensure the mechanical stability of the wire
bonds of the pixel detector in the strong magnetic field.
HK 45.9 Thu 18:45 C
Test Results of First ALICE TRD Series Production Chambers
— •David Emschermann for the ALICE TRD collaboration —
Physikalisches Institut, Universität Heidelberg, Germany
The ALICE Transition Radiation Detector (TRD) consists of 540 individual
detector chambers covering a total area of roughly 750 m 2 . They
HK 46 Theory VII
are arranged in a six layer barrel geometry in the central part of the
ALICE detector. The TRD chambers are built in 12 different dimensions
ranging from 97 x 108 x 12.5 cm 3 to 120 x 145 x 12.5 cm 3 , housing
either 1728 or 2304 individual channels. The readout electronics will be
mounted directly on the backside of the chamber allowing for real time
data processing. The series production of TRD chambers has started end
of 2003 and will run in 4 production sites for about two years.
First measurements of mass production chambers equipped with final
electronics will be presented. They include mechanical tolerances, gas
tightness, dark currents at operating voltage and voltage stability, gas
gain and its uniformity over the detector surface. These data form part
of the ALICE detector construction database.
Time: Thursday 16:30–19:00 Room: D
Group Report HK 46.1 Thu 16:30 D
Light front field theory at finite temperature and density — •M.
Beyer 1 , S. Mattiello 1 , S. Strauss 1 , T. Frederico 2 , and H.J.
Weber 3 — 1 FB Physik, U Rostock, Germany — 2 CTA, Sao Jose dos
Campos, Brazil — 3 U Virginia, Charlottesville, USA
A relativistic light front field theory for finite temperature is currently
being developed. Based on our previous results we generalize the present
formulation to include a finite chemical potential. This extension is in
particular relevant for the physics investigated by relativistic heavy ion
colliders. So far we have used the Nambu-Jona-Lasinio model to investigate
the gap equation and the chiral restoration. We compare results
in the light front form to the instant form of relativistic dynamics. To
investigate multi-particle correlations we utilize a Dyson expansion in a
global light front time. This enables us to study formation and dissociation
of hadrons in the vicinity of the phase transition. The approach is
well suited to incorporate light front QCD that has been successfully applied,
e.g., to describe deep inelastic scattering or to model the structure
of hadrons.
Work supported by Deutsche Forschungsgemeinschaft.
Group Report HK 46.2 Thu 17:00 D
Axial Anomalies in Strong Interactions — •B. Borasoy, N. Beisert,
E. Lipartia, and R. Nißler — Institute for Theoretical Physics
(T39), TU München, Germany
Phenomenological implications of axial anomalies in strong interactions
are discussed within the framework of chiral effective field theory.
Processes dominated by the axial anomalies are, e.g., the two-photon
decays of π 0 , η, η ′ or η, η ′ → π + π − γ. Different approaches in the anomalous
sector of the chiral theory are compared. Financial support of the
Deutsche Forschungsgemeinschaft is gratefully acknowledged.
HK 46.3 Thu 17:30 D
Two-photon decays of π 0 , η and η ′ — •Robin Nißler and Bu¯gra
Borasoy — Institute for Theoretical Physics (T39), TU München, Germany
The anomalous decays of π 0 , η and η ′ into two photons are investigated
in an effective U(3) chiral Lagrangian approach without employing large
Nc arguments [1].
Unitarity corrections beyond one-loop play an important role for the
decays with off-shell photons and are included by utilizing a coupled channel
Bethe-Salpeter equation which satisfies unitarity constraints and generates
vector-mesons from composed states of two pseudoscalar mesons
without including them explicitly. In this framework the phase shifts of
meson-meson scattering, particularly in the important ρ-resonance channel,
are precisely reproduced. We compare our method with the common
picture of Vector Meson Dominance, where vector mesons are included
explicitly and mediate all couplings between Goldstone bosons and external
photons. The importance of double vector meson exchange which
is crucial for the anomalous magnetic moment of the muon and kaon matrix
elements is critically re-examined within our approach. We present
our results and predictions for the decays with one, both or none of the
photons being off-shell. Financial support of the Deutsche Forschungsgemeinschaft
is gratefully acknowledged.
[1] B. Borasoy and R. Nißler, Eur. Phys. J. A (in print), hep-ph/0309011
HK 46.4 Thu 17:45 D
Thermodynamics of two-colour QCD in the Nambu Jona-
Lasinio model — •Claudia Ratti 1,2 and Wolfram Weise 1,2
— 1 Physik-Department, Technische Universität München, D-85747
Garching, GERMANY — 2 ECT*, Villa Tambosi, Strada delle Tabarelle
286, I-38050 Villazzano (Trento) ITALY
We investigate two-flavour and two-colour QCD at finite temperature
and chemical potential within the Nambu and Jona-Lasinio model; by
minimizing the thermodynamical potential of the system, we find that
a second order phase transition occurs at a value of the chemical potential
equal to half the mass of the Goldstone modes. For chemical
potentials beyond this value the scalar diquarks Bose condense and the
diquark condensate is nonzero. We obtain the behaviour of the chiral
condensate, the diquark condensate, the baryon charge density, the pion
decay constant, and the scalar diquark, pion and sigma masses as a function
of the temperature and chemical potential. Very good agreement
is found both with lattice results and with the predictions from chiral
perturbation theory.
Work supported in part by INFN and BMBF
HK 46.5 Thu 18:00 D
Broad quasiparticles in hot QCD — •André Peshier — Institut
für Theoretische Physik, Universität Giessen, 35392 Giessen, Germany
The thermodynamics of the strongly coupled QCD plasma (just) above
the transition temperature Tc can be understood by interpreting the relevant
degrees of freedom as quasiparticles, with masses m ∼ g(T)T, which
become heavy near Tc. Since the coupling strength g is large it is natural
to ask for the width of the quasiparticles, which parametrically behaves
as g 2 T. Discussed are the constraints, given by the equation of state
as obtained in lattice QCD, on the width as well as implications of the
results.
Work supported by BMBF.
HK 46.6 Thu 18:15 D
Gluonic currents and the scaling of nucleon electro-magnetic
form factors — •M.M. Kaskulov and P. Grabmayr — Physikalisches
Institut der Universität Tübingen, Auf der Morgenstelle 14, D-72076
Tübingen
The ratio µpG p
E/G p
M decreases for four-momentum transfer Q2 larger
than ∼1 GeV2 indicating different spatial distributions for charge and
for magnetization inside the proton. Gluon-exchange currents can
explain this behaviour [1]. The SU(6) breaking induced by gluonic
currents predicts furthermore the scaling violation in other ratios: the
ratio of neutron to proton magnetic form factors µpG n M
/µnG p
M falls and
ratio of neutron electric to magnetic form factors µnG n E/G n M rises with
increasing Q 2 . We show that the new JLab data are consistent with our
expectations.
[1] M.M. Kaskulov and P. Grabmayr, Phys. Rev. C67 (2003) 042201(R)
HK 46.7 Thu 18:30 D
Nucleon Spectral Functions in Asymmetric Nuclear Matter —
•Patrick Konrad, Horst Lenske, and Ulrich Mosel — Institut
für Theoretische Physik, Universität Giessen, 35392 Giessen, Germany
We use a model based on a transport theoretical approach [1]
for calculating the nucleon spectral function in asymmetric nuclear

Nuclear Physics Thursday
matter. The spectral functions for neutrons and protons are derived
self-consistently by assuming a constant matrix element for ppp −1 ,
nnn −1 , pnn −1 and npp −1 collisions. The mean-field contribution
is incorporated by a Skyrme type potential, including momentum
dependence. Using the Kramers-Kronig relation the real part of the
self-energy was inserted. At the end we compare our results for different
densities and proton-neutron asymmetries. From calculations with
and without the real part of the dynamical self-energy we find that
the spectral properties are only weakly affected by dispersive effects.
For increasing neutron excess the neutron spectral function shows a
stronger momentum dependence than the proton spectral function
which is explained by the isospin dependence of the effective mass. An
outlook to future calculations with a fully self-consistent treatment of
the dynamical and the mean-field parts and extensions to hypermatter
is given.
Work supported by BMBF.
[1] J.Lehr, H.Lenske, S.Leupold, U.Mosel, Nucl.Phys.A703 (2002) 393
HK 47 Heavy Ions V
HK 46.8 Thu 18:45 D
The Decay of the Σ 0 –Hyperon in a Covariant Faddeev Approach
— •Markus Kloker, Reinhard Alkofer, and Hugo Reinhardt
— Institute of Theoretical Physics, Tübingen University
The relativistic three–quark problem is treated by modeling dressed
quark propagators and two–quark scalar and axialvector correlations
[1,2]. The resulting reduced Poincaré invariant Faddeev equations are
solved for octet and decuplet baryons. The radiative decay of the
Σ 0 → Λγ is calculated. The off-shell behaviour of the corresponding
amplitude is investigated and combined with a description of associated
strangeness production in this Faddeev approach [3]. Off-shell radiative
transitions are considered as isospin violating final state interactions in
the near-threshold Λ and Σ production studied experimentally at COSY.
[1] M. Oettel and R. Alkofer, Eur. Phys. J. A 16 (2003) 95. [2] M. Oettel,
PhD thesis, arXiv:nucl-th/0012067. [3] S. Ahlig et al., Phys. Rev. D 64
(2001) 014004. Supported by COSY under contract no. 41445395.
Time: Thursday 16:30–19:00 Room: E
Group Report HK 47.1 Thu 16:30 E
Dilepton production in elementary and heavy ion collisions at
intermediate energies — •Christian Fuchs 1 , Amand Faessler 1 ,
Mikhail Krivoruchenko 1,2 , and Boris Martemyanov 1,2 —
1 Institut für Theoretische Physik der Universität Tübingen, Auf
der Morgenstelle 14, D-72076 Tübingen, Germany — 2 Institute for
Theoretical and ExperimentalPhysics, B. Cheremushkinskaya 25, 117259
Moscow, Russia
We present a unified description of the vector meson and dilepton production
in elementary and in heavy ion reactions. The production of
vector mesons (ρ, ω) is described via the excitation of nuclear resonances
(R). The theoretical framework is an extended vector meson dominance
model (eVMD). The resonance model is successfully applied to the ω
production in p + p reactions and to the dilepton production in elementary
reactions (p + p, p + d). However, when the model is applied to
heavy ion reactions in the BEVALAC/SIS energy range the experimental
dilepton spectra measured by the DLS Collaboration are significantly
underestimated at small invariant masses. As a possible solution of this
problem the destruction of quantum interference in a dense medium is
discussed. A decoherent emission through vector mesons decays enhances
the corresponding dilepton yield in heavy ion reactions. In the vicinity of
the ρ/ω-peak the reproduction of the data requires further a substantial
collisional broadening of the ρ and in particular of the ω meson.
Group Report HK 47.2 Thu 17:00 E
Color dipoles and the saturation of nuclear partons —
•Wolfgang Schäfer 1 , Igor P. Ivanov 2 , Nikolai N. Nikolaev
1,3 , Bronislav G. Zakharov 3 , and Vladimir R. Zoller 4 —
1 IKP, FZ-Jülich — 2 Sobolev Inst. Math., Novosibirsk — 3 L.D. Landau
Inst., Moscow — 4 ITEP, Moscow
The treatment of hard processes in high energy nuclear collisions requires
an understanding of the parton distributions in energetic Lorentz–
contracted nuclei. Already at RHIC energies and even more so at LHC,
the gluon density is of special importance. We present an overview of
recent developments in the color dipole approach to small-x processes.
Here one has to consider the propagation of multiparton systems at fixed
impact parameters through the nucleus, which becomes a coupled channel
problem in the color space of the partonic system. A special focus
will be on the factorization properties of various observables. We discuss
the extension of the so–called kt-factorization to nuclear processes. The
major difference to reactions on the free nucleon is the opacity(strong
absorption)of heavy nuclei, which leads to the saturation of nuclear partons
and the emergence of a new hard scale, the saturation scale. We
investigate the impact of saturation on a number of observables such as
dijet production and their azimuthal decorrelation, high mass diffraction,
deep inelastic diffractive vector mesons and their helicity content, as well
as heavy quark pair and minijet production in nuclear collisions.
HK 47.3 Thu 17:30 E
Contribution of the nucleon-hyperon reaction channels
to K − production in proton-nucleus collisions — •Hanns-
Werner Barz and Lothar Naumann — Institut für Kern- und
Hadronenphysik, Forschungszentrum Rossendorf
The cross sections for producing K − mesons in nucleon-hyperon elementary
processes are estimated using the experimentally known pionhyperon
cross sections. The results are implemented in a transport model
which is applied to calculation of proton-nucleus collisions. In significant
difference to earlier estimates in heavy-ion collisions the inclusion
of the nucleon-hyperon cross section roughly doubles the K − production
in near-threshold proton-nucleus collisions. Calculations for K + and K −
production in proton on carbon and gold collisions are compared to recent
measurements carried out by the KaoS collaboration.
HK 47.4 Thu 17:45 E
Kaon and pion production in heavy ion collisions at 2-40 AGeV
— •Markus Wagner — Institut fuer Theoretische Physik, Univ
Giessen Heinrich-Buff-Ring 16, D-35392 Giessen, Germany
One aim of heavy ion physics is to study the phase transition from the
hadronic phase to the quark gluon plasma. It has been argued that an
indication for such a transition should be an enhancement of strangeness
production and in particular an enhancement in the K + /π + ratio. Experiments
indeed observe a peak in that ratio at about 30GeV beam energy.
We study the production of strangeness within the BUU transport model
based on hadronic and string degrees of freedom at energies from 2GeV to
40GeV. With standard parameters the model underpredicts the K + /π +
ratio at the peak. We analyse in detail the influence of the particle life
times, formation times and off-shellness on the BUU results. We systematically
compare the model to data from reactions with different system
sizes with emphasis on the strangeness production mechanisms. We will
also show and discuss the comparison to other models.
HK 47.5 Thu 18:00 E
The NN → N∆ cross section in nuclear matter — •Alexei Larionov
and Ulrich Mosel — Institut für Theoretische Physik, Universität
Giessen, 35392 Giessen, Germany
We present calculations of the NN → N∆ cross section in nuclear
matter within the one-pion exchange model taking into account pion collectivity,
vertex renormalization by the contact nuclear interactions and
Dirac effective masses of the baryons due to coupling with the scalar σ
field. Introducing the Dirac effective masses leads to an in-medium reduction
of the cross section. The experimental data on pion multiplicities
from the collisions of Ca+Ca, Ru+Ru and Au+Au at 0.4 ÷ 1.5 A GeV
(GSI Darmstadt, FOPI Collaboration) are well described by Boltzmann-
Uehling-Uhlenbeck (BUU) calculations with the in-medium cross section.
Work supported by GSI.

Nuclear Physics Thursday
HK 47.6 Thu 18:15 E
Transverse Momentum Dependence of Charmonium Suppression
— •Alberto Polleri — Physik Department der Technische Universität
München, D-85747 Garching, Germany — ECT ∗ , Villa Tambosi,
I-38050 Villazzano (Trento), Italy
The importance of studying differential structures in particle spectra
produced by heavy-ion experiments has recently become more and more
evident. I will discuss the case of charmonium production and underline
the necessity to examine both longitudinal and transverse momentum
dependencies of the suppression pattern. I will show, in particular, that
the existence of a long-lived QGP phase, modeled as a thermodinamicaly
consistent quasi-particle gas, naturally explains several features of the
spectra, in particular the centrality dependence of transverse momentum
broadening.
HK 47.7 Thu 18:30 E
Non-equilibrium and Asymmetry Effects in Intermediate Energy
Heavy Ion Collisions ∗ — •Th. Gaitanos 1,2 , Chr. Fuchs 3 ,
R.-A. Ionescu 4 , and H.H. Wolter 1 — 1 Sektion Physik, Univ. of Munich
— 2 LNS, INFN, Catania — 3 Inst. Theor. Physik, Univ. Tübingen
— 4 NIPNE, Bucharest
An important motivation for the investigation of intermediate energy
heavy ion collisions is to determine the equation-of-state of nuclear matter,
and, in view of the interest in isospin phenomena, in particular of
asymmetric nuclear matter. However, non-equilibrium effects are important
in such collisions, as evidenced by non-spherical momentum distributions
during an essential part of the collision. We have previously
discussed these effects in terms of 2-Fermi-sphere (colliding nuclear mat-
HK 48 Nuclear and Particle Astrophysics IV
ter, CNM) configurations. We have extended this model to asymmetric
CNM (ACNM) configurations to take into account asymmetry effects. In
parallel we also investigate explicit momentum dependence in a 1-Fermisphere
configuration and compare the two methods of treating momentum
dependence. We investigate in particular double differential flow
effects as a function of rapidity and transverse momentum and compare
to recent data of the FOPI collaboration.
∗ supported by BMFT, grant 06 LM 981.
HK 47.8 Thu 18:45 E
Kinetic and Chemical Equilibration in a parton cascade including
inelastic collisions — •Zhe Xu and Carsten Greiner* — Institut
für Theoretische Physik, Universität Giessen, 35392 Giessen, Germany
(*present address: Institut für Theoretische Physik, Universität
Frankfurt, 60054 Frankfurt am Main, Germany)
We present a new 3+1 dimensional Monte Carlo algorithm solving the
kinetic Boltzmann equation for partons including the inelastic gg ↔ ggg
pQCD multiplication processes. The back reaction channel is treated for
the first time fully consistently within this scheme. An extended stochastic
method is used to solve the collision integral. Assuming multiple
production of minijets in Au+Au collisions as initial space-time input,
we study the kinetic and chemical equilibration at RHIC energy. It is
demonstrated that thermalization is driven mainly by the inelastic processes
on a timescale of less than 1 fm/c. We also discuss the consequence
on parton thermalization when a color glass condensate is considered as
the initial state of partonic matter. Again, we find a fast thermalization
within the various local rapidity cells of the partonic phase.
Work supported by BMBF.
Time: Thursday 16:30–19:00 Room: F
HK 48.1 Thu 16:30 F
The KATRIN Experiment: Status and Sensitivity on the
neutrino mass — •Klaus Eitel for the KATRIN collaboration —
Forschungszentrum Karlsruhe, Institut für Kernphysik
The determination of the absolute neutrino mass scale, which is not
accessible by neutrino oscillation experiments, is of fundamental importance
in particle physics and cosmology. The KArlsruhe TRItium
Neutrino experiment addresses this task by investigating spectroscopically
the electron spectrum from the Tritium β decay 3 H → 3 He+e − +¯νe
near its kinematical endpoint of 18.6keV. With a strong molecular windowless
gaseous Tritium source and an electrostatic filter of unprecedented
energy resolution of ∆E = 1eV, KATRIN will allow a direct
model-independent measurement of neutrino masses in the sub-eV range
relevant for structure formation in the early universe.
We present an overview of the experimental configuration as well as
a status report of the ongoing construction and conclude with detailed
analyses of the expected neutrino mass sensitivity of 0.2eV (90% CL).
Funded in part by the German BMBF Förderschwerpunkt Astroteilchenphysik
under 05CK1VK1/7 und 05CK1UM1/5.
HK 48.2 Thu 16:45 F
Calibration and long term monitoring of the KATRIN-
Spectrometer with a condensed 83m Kr Source — •Beatrix
Müller for the KATRIN collaboration — Helmholtz-Institut für
Strahlen- und Kernphysik, Rheinische Friedrich-Wilhelms-Universität,
D-53115 Bonn
The KATRIN-Experiment will investigate the m ¯νe by a precise measurement
of the endpoint region of the tritium β spectrum with a sensitivity
on m ¯νe of 0,2 eV. The measurement will be executed by an electrostatic
filter supported by a magnetic guidance and momentum collimation
of the β particles.
Due to the shape of the β spectrum any undetected fluctuation with σ
(r.m.s.) of the analysing electrostatic potential will lead to a systematic
shift of m 2 ¯νe by −2σ2 . Therefore the exact knowledge of the electrostatic
potential is crucial to the determination of the neutrino mass. A long
term stability can only be monitored by use of an electron emitter with a
nuclear or atomic standard. 83m Kr emits a 2,9 eV broad K32-conversion
electron line at 17825 eV (≈ endpoint region of the tritium β spectrum).
A refreshable low temperature 83m Kr source is being developped in Bonn
which is to detect fluctuations of the retarding potential of less than 70
meV. The source will be placed in a dedicated monitor spectrometer to
allow a continuous monitoring of the retarding potential of the KATRIN
main spectrometer.
A feasability study of the production of 83 Rb was done at the Bonn
cyclotron.
Supported by the BMBF under contract 05CK2PD1/5.
HK 48.3 Thu 17:00 F
Status of the Pre-Spectrometer of the KATRIN Neutrino Mass
Experiment — •Joachim Wolf for the KATRIN collaboration —
IEKP, Universität Karlsruhe
The KArlsruhe TRItium Neutrino experiment KATRIN is an international
next-generation experiment, which will improve the current neutrino
mass sensitivity in tritium decay by one order of magnitude. KA-
TRIN will be based on a high luminosity windowless molecular tritium
source and a system of two retarding electro-static spectrometers, and
allows to measure the spectral shape close to the beta-endpoint with an
energy resolution of 1 eV. Recent improvements on the KATRIN design
result in an estimated neutrino mass sensitivity of 0.2 eV. This talk reports
on the present status of UHV measurements with the KATRIN prespectrometer
vessel in Karlsruhe, which acts as a prototype for the larger
main spectrometer vessel. Later this year the novel electro-magnetic design
of the pre-spectrometer will be tested thoroughly. (Supported in
part by the German BMBF No. 05CK1VK1/7 and 05CK1UM1/5).
HK 48.4 Thu 17:15 F
Status of the HEIDELBERG-MOSCOW Experiment 2003 —
•Hans Volker Klapdor-Kleingrothaus, Irina Krivosheina,
Alexander Dietz, and Oleg Chkvorets — Max-Planck-Institut
fuer Kernphysik, Saupfercheckweg 1, D-69117 HEIDELBERG, GER-
MANY
The HEIDELBERG-MOSCOW Double-Beta-Decay experiment in
GRAN SASSO has collected data in the period August 1990 - 2003.
The measurement and the analysis of the data is presented. The collected
statistics is 71.7 kg y. The background achieved in the energy
region of the Q value for double beta decay is 0.11 events/kg y keV. The
two-neutrino accompanied half-life is determined on the basis of more
than 100 000 events. The confidence level for the neutrinoless signal has
been improved.

Nuclear Physics Thursday
HK 48.5 Thu 17:30 F
ERNA: a status report — •Daniel Schürmann — Institut für Experimentalphysik
III, Ruhr-Universität Bochum, Universitätsstr. 150,
44780 Bochum
The fusion of Carbon and Helium in the nuclear reaction 12 C(α, γ) 16 O
takes place in the helium burning phase of red giant stars. This reaction
is commonly refered to as a key reaction in nuclear astrophysics. Still
the uncertainties of the astrophysical S(E) factor used in stellar model
calculations are too large.
To improve this situation we are performing a new measurement of
the 12 C(α, γ) 16 O cross section. Previous measurements are mainly based
on the detection of the reaction gamma rays. Using the European Recoil
separator for Nuclear Astrophysics (ERNA) we will detect the free
oxygen recoil nuclei. Therefore a 4 He gas target is bombarded by a 12 C
ion beam. A combination of two Wien filters and a dipole magnet filters
reaction products from beam particles. The oxygen recoils are then identified
in an ionisation chamber telescope. Additionally one can detect the
gamma rays in coincidence.
The talk will discuss the gas target used in the experiment as well
as first measurements. The influence of the charge exchange during the
nuclear reaction on the recoil charge state will be shown.
This project is supported by the Deutsche Forschungsgemeinschaft
(RO 429/35-2).
HK 48.6 Thu 17:45 F
Measurement of the 3 He(α, γ) 7 Be cross section with ERNA —
•Antonino Di Leva for the ERNA collaboration — Institut für Experimentalphysik
III, Ruhr-Universität Bochum
The 3 He(α, γ) 7 Be reaction plays an important role in the interpretation
of the results of the solar neutrino experiments, which gave strong
hints or reported about neutrino oscillations.
Indeed, the estimate of the oscillation parameters relies on the solar neutrino
spectrum which is calculated by solar models: the relative rate of
3 He(α, γ) 7 Be with respect to the rate of 3 He( 3 He, 2p) 4 He determines the
high energy component of the solar neutrino spectrum, that is mostly
produced by the decay of 7 Be and 8 B.
Previous measurements of the cross section for the 3 He(α, γ) 7 Be reaction
have been performed detecting the capture gamma rays or, alternatively,
measuring the activity of the synthesized 7 Be. While the results
of the two different approaches agree on the energy dependence of the
astrophysical S factor, they disagree in the extrapolated S34(0) value at
a 3σ level, that suggests the presence of systematic errors in one or both
of the techniques, or, possibly, a non radiative component in the cross
section.
A novel approach to study this reaction relies on the European Recoil
separator for Nuclear Astrophysics (ERNA), that can provide the
simultaneous detection of both the capture gamma rays and the 7 Be ions
produced in the reaction. In this talk, the experiment and its feasibility
are discussed.
HK 48.7 Thu 18:00 F
Magnetometry and neutron EDM false effects — •Iouri
Sobolev 1 , Stefan Baessler 2 , Werner Heil 2 , Wolfgang
Kilian 3 , Vinzenz Kirste 2 , Herbert Rinneberg 3 , and Frank
Seifert 3 — 1 PNPI Gatchina — 2 Institut fuer Physik , Universitaet
Mainz — 3 PTB Berlin
In the near future, the availability of powerful ultra-cold neutron (
UCN ) sources at different research centers ( LANL, PSI, FRM-II, ILL,
... )will significantly improve the measurement sensitivity to the neutron
EDM over what is reported in literature ( ¡ 6 x 10(-26) [ecm] ). In this
context one may raise the question, whether false neutron EDM effects
can be scaled down, too, while keeping up the principle layout of an EDM
experiment based on magnetic resonance technique of rotating magnetic
dipole moments in a magnetic field with an electric field superimposed.
We report on sizable systematic effects, which enter in the presence of
magnetic field gradients in combination with motional magnetic fields (
B = (E x v)/c ). As a result, a pulling of the Larmor frequency can
be observed due to the generalization of the Bloch-Siegert shift which is
linear in the electric field and thus cannot be distinguished from a true
EDM effect. In connection with this the role of magnetometry will be of
utmost importance.
HK 48.8 Thu 18:15 F
The PISA experiment—Spallation Products Identified By
Bragg Curve Spectroscopy — •Frank Goldenbaum (for the
PISA collaboration) — Forschungszentrum Jülich GmbH, IKP,
D-52425 Jülich, Germany
In the framework of Spallation-Neutron Sources and accelerator driven
systems in general the int. collaboration PISA (Proton Induced SpAllation)
has initiated measurements of total and double differential crosssections
for products of spallation reactions on Ni and Au at the paccelerator
COSY in Jülich in order to study secondary particle production
created in structural- window- and target-materials by proton beams
up to 2.5 GeV incident kinetic energy. Residual nuclei—as H, He and
IMF-production cross sections are of great importance for estimations
of damages caused by irradiation. The demand for reliable theoretical
predictions of production cross sections is by no means satisfied by the
models and codes which are available today. In this context it is essential
that reliable and comprehensive experimental data—especially for
p-energies beyond 1 GeV exist which can serve as benchmarks for code
development and validation. Reliable systematic data bases—especially
for p-energies beyond 1 GeV are urgently needed in order to validate and
improve the existing high energy transport codes. The task of the PISA
project is to provide such data taken by Bragg curve spectroscopy and
silicon detector telescopes for the reaction 1.9 and 2.5 GeV p+Ni(Au).
HK 48.9 Thu 18:30 F
Neutron decay parameters and Instrument ”NEW PERKEO”
— •Bastian Märkisch, Dirk Dubbers, and Hartmut Abele —
Physikalisches Institut, Universität Heidelberg, Philsophenweg 12, 69120
Heidelberg
We present the ”NEW PERKEO”, an instrument for measurements
of neutron decay parameters, giving unique information on the question
of quark-mixing. The results will be free of background and virtually
no corrections will be applied to the raw data. The experiment strongly
profits from the high flux of a new cold neutron beam at the Institut
Laue-Langevin in Grenoble, making neutrons worldwide highly attractive
for particle physics.
HK 48.10 Thu 18:45 F
A neutron source for activation measurements in a stellar
spectrum at kT=8 keV — •Michael Heil 1 , S. Dababneh 1 , F.
Käppeler 1 , S. O’ Brien 2 , R. Plag 1 , and R. Reifarth 3 —
1 Forschungszentrum Karlsruhe, Institut für Kernphysik, Postfach 3640,
D-76021 Karlsruhe, Germany — 2 Department of Physics, University of
Notre Dame, Notre Dame, IN 46556, USA — 3 Los Alamos National Laboratory,
Los Alamos, New Mexico 87545, USA
Since 1980 the 7 Li(p,n) 7 Be reaction was intensively used for activation
measurements. With a proton energy of Ep=1911 keV the resulting
neutron spectrum resembles a Maxwell-Boltzmann distribution with a
thermal energy of kT=25 keV. Therefore, this neutron source is ideal to
determine Maxwellian-averaged neutron capture cross sections (MACS)
close to a temperature of 250 million Kelvin (kT=23 keV) which is typical
for the s process in red giant stars. Meanwhile, detailed stellar models
indicate that the dominant neutron exposure of the main s-process component
in low mass AGB stars takes place at a lower temperature of 90
million Kelvin (kT=8 keV). In order to supply the necessary reaction
rates for the stellar models the values at 25 keV have to be extrapolated
to the lower thermal energy, introducing additional uncertainties. In this
contribution we report on a neutron source which allows to produce a
Maxwell-Boltzmann spectrum close to the lower thermal energy of kT=8
keV.

Nuclear Physics Friday
HK 49 Plenary Session
Time: Friday 08:30–10:30 Room: P
Plenary Talk HK 49.1 Fri 08:30 P
Pentaquarks: status of theory — •Maxim Polyakov — Liege University
Various theoretical pictures of recently discovered pentaquark baryons
are reviewed. Implications of the pentaquarks for hadronic physics are
discussed.
Plenary Talk HK 49.2 Fri 09:00 P
Experimental evidence for pentaquarks — •Michael Ostrick —
Physikalisches Institut Universitaet Bonn
Recently several experimental groups reported evidence for the formation
and the (photo)–production of a narrow K + n–resonance, the
Θ + (1540). Such an object does not fit into the ordinary quark picture of
hadrons, where baryons are understood in terms of three valence quarks
and a sea of gluons and quark–anti-quark excitations. In order to account
for its positive strangeness the Θ + must have at least one anti–strange
quark together with 4 quarks and is therefore called pentaquark.
The current status of experimental evidences for pentaquark states will
be presented in the talk and open questions will be discussed.
Plenary Talk HK 49.3 Fri 09:30 P
Newest results from HERMES — •Delia Hasch for the HERMES
collaboration — INFN-LNF, Frascati, Italy
At HERMES the 27.6 GeV longitudinally polarised electron or positron
beam in the HERA storage ring is incident on polarised atomic gas tar-
HK 50 Plenary Session
gets as well as on several nuclear targets. The primary goal of the HER-
MES experiment is the study of the spin structure of the nucleon. Two
pieces remain completely unmeasured - the transverse spin distribution of
quarks in the nucleon, described by the transversity (h1), and the contribution
of the orbital angular momentum of quarks and gluons. HERMES
has measured transverse single-spin asymetries in deep-inelastic scattering
providing for the first time a direct access to the transversity h1 as
well as to the time-odd distribution function f ⊥ 1 (Sivers function). The
quark’s orbital angular momentum contribution to the nucleon spin can
be studied via hard exclusive processes within the formalism of generalised
parton distributions. New results on exclusive meson production
will be reported.
HERMES furthermore studies the production and transport of hadrons
in cold nuclear matter. Measurements of possible absorbtion and fragmentation
function modification for π, K, p and ¯p are presented. Links
between cold and hot nuclear matter are discussed too.
Plenary Talk HK 49.4 Fri 10:00 P
Recent results for excited nucleons from the lattice — •Christof
Gattringer — Universität Regensburg
We discuss recent results for excited nucleons on the lattice. In particular
we focus on the level ordering of positive and negative parity states
in the chiral limit. Different choices for the interpolating fields are discussed
and we address results for the wave function of ground and excited
states. Recent calculations of different collaborations are reviewed and
compared. Open problems for future lattice calculations are discussed.
Time: Friday 11:00–13:00 Room: P
Plenary Talk HK 50.1 Fri 11:00 P
Jet Quenching at RHIC - Experiment — •Andre Mischke —
Department of Subatomic Physics, University of Utrecht, The Netherlands
Calculations from Lattice-QCD predict that at high energy densities a
phase transition between hadronic matter and a deconfined state formed
by quarks and gluons (the QGP) occurs. The Relativistic-Heavy-Ion-
Collider (RHIC) at Brookhaven National Laboratory, which provides
nucleus-nucleus collisions at maximum available energies of √ sNN = 200
GeV, allows to study nuclear matter under extreme conditions. High
pT hadrons provide a penetrating probe into relativistic heavy ion collisions
as they are presumably produced as the leading fragment from
hard-scattered partons traversing and interacting with the hot and dense
medium created in the early state of the collision. After three years of
data taking, the experiments at RHIC provide precise measurements of
high pT particles spectra (charged hadrons and π 0 up to 12 GeV/c and
identified charged particles up to 6 GeV/c). Recent results on high pT
particle suppression, two-particle azimuthal correlations and azimuthal
anisotropy of high pT hadrons will be presented.
Plenary Talk HK 50.2 Fri 11:30 P
Jet Quenching at RHIC and LHC - Theory — •Urs Achim
Wiedemann — CERN TH Division, CH-1211 Geneva 23
Three years after commissioning, experiments at the Relativistic Heavy
Ion Collider RHIC provide a consistent picture of suppressed high-pt
hadroproduction in 200 GeV/A Au+Au collisions. This phenomenon
was predicted to occur as a consequence of medium-induced parton energy
loss in dense QCD matter. Here, I discuss the theory of parton
energy loss, the data supporting it, as well as alternative explanations
put forward more recently. I review calculations which emphasize the rich
phenomenology accessible at LHC and I discuss their relevance for the
fundamental problem of understanding hadronization and equilibration
in the theory of strong interactions.
Plenary Talk HK 50.3 Fri 12:00 P
Structure of few-nucleon systems near and beyond the dripline
— •Haik Simon — Gesellschaft für Schwerionenforschung mbH, D–
64291 Darmstadt
The structure of few-nucleon systems at the border lines to proton and
neutron instability is one of the fundamental questions in modern nuclear
physics. Ground state properties as well as few-body correlations of such
weakly bound nuclear systems can quantitatively investigated by utilizing
high-energy (0.2–1.5 GeV/nucleon) radioactive beams. Recent results
from measurements of breakup reactions with light (He–O) neutron-rich
nuclei close to the dripline performed at the GSI accelerator facility will
be presented. Nucleon-removal reactions populating states in the (A-1)
nucleus provide access to the momentum content of the valence nucleons
wave functions, e.g., via the measurement of momentum distributions
and cross sections. Spectroscopic information can also be obtained for
ground and excited states of nuclei, even beyond the dripline. More detailed
information can be gathered on, e.g. three-body correlations, from
the kinematically complete measurement of the breakup products. Energy
and momentum transfer in the reactions as well as clusterization of
the nuclei under study can be investigated further, when using for example,
a liquid hydrogen target in conjunction with a measurement of the
recoil protons.
Supported by BMBF and GSI.
Plenary Talk HK 50.4 Fri 12:30 P
Probing the halo structure of exotic nuclei by elastic proton
scattering in inverse kinematics — •Peter Egelhof —
Gesellschaft für Schwerionenforschung mbH, Planckstrasse 1, D-64291
Darmstadt, Germany
Proton-nucleus elastic scattering at intermediate energies, a wellestablished
method for probing nuclear-matter density distributions of
stable nuclei, was applied for the first time to exotic nuclei. This method
is demonstrated to be an effective means for obtaining detailed information
on the size and radial shape of halo nuclei. Differential cross-sections
for small-angle scattering were measured at energies near 700 MeV/u for
the neutron-rich helium isotopes 6,8 He, and more recently for the lithium
isotopes 6,8,9,11 Li. The experimental concept and the procedure of the
data analysis in terms of the Glauber multiple scattering theory are discussed,
and the results on the nuclear matter radii, the matter distributions,
and the significance of the data for a halo structure are presented.
The data allow also for a sensitive test of theoretical model calculations
on the structure of halo nuclei.
In a very recent experiment data on p 6,8 He elastic and quasielastic
scattering towards higher momentum transfer were taken using a liquid
hydrogen target. Such data are expected to give more detailed insight
into the inner structure of these halo nuclei. First results are presented.

ALADIN-INDRA Collaboration
G. Auger 1 , M.L. Begemann-Blaich 2 , N. Bellaize 3 , R. Bittiger
2 , F. Bocage 3 , B. Borderie 4 , R. Bougault 3 , B. Bouriquet
1 , J.L. Charvet 5 , A. Chbihi 1 , R. Dayras 5 , D. Durand 3 ,
J.D. Frankland 1 , E. Galichet 4 , D. Gourio 2 , D. Guinet 6 , S. Hudan
1 , P. Lautesse 6 , F. Lavaud 4 , A. Le Fèvre 2 , R. Legrain 5 , O.
Lopez 3 , J. Lukasik 2 , U. Lynen 2 , W.F.J. Müller 2 , L. Nalpas 5 , H.
Orth 2 , E. Plagnol 4 , E. Rosato 7 , A. Saija 8 , C. Schwarz 2 , C. Sfienti
2 , B. Tamain 3 , W. Trautmann 2 , A. Trzcinski 9 , K. Turzó 2 ,
E. Vient 3 , M. Vigilante 7 , C. Volant 5 , B. Zwieglinski 9 , and A.S.
Botvina 2,10
1GANIL, CEA et IN2P3-CNRS, F-14076, France
2Gesellschaft für Schwerionenforschung mbH, D-64291 Darmstadt, Germany
3LPC, IN2P3-CNRS, ENSICAEN et Université, F-14050 Caen, France
4IPN Orsay, IN2P3-CNRS, F-91406 Orsay, France
5DAPNIA/SPhN, CEA Saclay, F-91191 Gif-sur-Yvette, France
6IPN Lyon, IN2P3-CNRS et Université, F-69622 Villeurbanne, France
7Dip. di Scienze Fisiche e Sezione INFN, Univ. Federico II, I-80126 Napoli,
Italy
8Dip. di Fisica dell’ Universitá e INFN, I-95129 Catania, Italy
9Soltan Institute for Nuclear Studies, Pl-00681 Warsaw, Poland
10Institute for Nuclear Research, 117312 Moscow, Russia
ALICE TRD Collaboration
C. Adler 1 , A. Andronic 2 , V. Angelov 3 , H. Appelshäuser 2 , C.
Baumann 4 , J. Bielcikova 1 , C. Blume 5 , P. Braun-Munzinger 2 , D.
Bucher 4 , O. Busch 2 , V. Cătănescu 6 , V. Chepurnov 7 , S. Chernenko
7 , M. Ciobanu 6 , H. Daues 2 , D. Emschermann 1 , O. Fateev 7 ,
P. Foka 2 , C. Garabatos 2 , R. Glasow 4 , H. Gottschlag 4 , T.
Gunji 8 , M. Gutfleisch 3 , H. Hamagaki 8 , J. Hehner 2 , N. Heine 4 ,
N. Herrmann 1 , M. Inuzuka 8 , E. Kislov 7 , V. Lindenstruth 3 ,
C. Lippmann 2 , W. Ludolphs 1 , T. Mahmoud 1 , A. Marin 2 , D.
Miskowiec 2 , K. Oyama 1 , Yu. Panebratsev 7 , V. Petracek 1 , M.
Petrovici 6 , A. Radu 6 , C. Reichling 3 , K. Reygers 4 , A. Sandoval
2 , R. Santo 4 , R. Schicker 1 , R. Schneider 3 , K. Schwarz 2 ,
S. Sedykh 2 , R.S. Simon 2 , L. Smykov 7 , H.K. Soltveit 1 , J.
Stachel 1 , H. Stelzer 2 , H. Tilsner 3 , G. Tsiledakis 2 , I. Rusanov 1 ,
W. Verhoeven 4 , B. Vulpescu 1 , J.P. Wessels 4 , A. Wilk 4 , B.
Windelband 1 , V. Yurevich 7 , Yu. Zanevsky 7 , and O. Zaudtke 4
1Physikalisches Institut, Heidelberg, Germany
2GSI, Darmstadt, Germany
3Kirchhoff Institut, Heidelberg, Germany
4Universität Münster, Germany
5Universität Frankfurt, Germany
6NIPNE Bucharest, Romania
7JINR Dubna, Russia
8University of Tokyo, Japan
ATRAP Collaboration
N.S. Bowden 1 , D. Comeau 2 , G. Gabrielse 1 , D. Grzonka 3 , T.W.
Hänsch 4,5 , M. Herrmann 4 , E.A. Hessels 2 , W. Oelert 3 , P. Oxley
1 , H. Pittner 4 , G. Schepers 3 , T. Sefzick 3 , A. Speck 1 , C.H.
Storry 1 , J.N. Tan 1 , and J. Walz 4
1 Department of Physics, Harvard University, Cambridge, MA 02138
2 York University, Department of Physics and Astronomy, Toronto, Ontario
M3J 1P3, Canada
3Institut für Kernphysik, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
4Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, 85748
Garching, Germany
5Ludwig-Maximilians-Universität München, Schellingstrasse4/III, 80799
München, Germany
A1 Collaboration
P. Achenbach 1 , K. Aniol 2 , J.R.M. Annand 3 , M. Ases Antelo
1 , C. Ayerbe 1 , P. Barneo Gonzalez 4 , D. Baumann 1 , I.
Collaborations
Collaborations
Bensafa 5 , J. Bermuth 6 , J. Bernauer 1 , A.M. Bernstein 7 , W.
Bertozzi 7 , H.P. Blok 8 , R. Böhm 1 , B. Boillat 9 , D. Bosnar 10 ,
D. Branford 11 , E. Burtin 12 , C. Carasco 9 , J.P. Chen 7 , N.
d’Hose 12 , M. Ding 1 , M.O. Distler 1 , M.B. Epstein 2 , I. Ewald 1 ,
K.G. Fissum 7 , H. Fonvielle 5 , J. Friedrich 1 , J.M. Friedrich 1 ,
J. García Llongo 1 , M. Garçon 12 , S. Gilad 7 , R. Gilman 13 , C.
Glashausser 13 , D. Glazier 3 , I. Goussev 6 , P. Grabmayr 14 , M.
Hauger 9 , T. Hehl 14 , W. Heil 6 , J. Heim 14 , W.H.A. Hesselink 8 , A.
Hügli 9 , E. Jans 4 , P. Jennewein 1 , G. Jover Ma nas 1 , J. Jourdan
9 , S. Kerhoas-Cavata 12 , T. Klechneva 9 , Fritz Klein 15 , M.
Kohl 16 , M. Kotulla 9 , B. Krusche 9 , K.W. Krygier 1 , G. Kumbartzki
13 , L. Lapikás 4 , M. Lloyd 1 , C. McGeorge 3 , I.J.D. Mac-
Gregor 3 , M. Makek 10 , S. Malov 13 , D.J. Margaziotis 2 , J. Marroncle
12 , H. Merkel 1 , K. Merle 1 , P. Merle 1 , D. Middleton 3 ,
R.A. Miskimen 17 , U. Müller 1 , R. Neuhausen 1 , Ch. Normand 9 ,
L. Nungesser 1 , F. Parpan 9 , B. Pasquini 18 , R. Pérez Benito 1 , A.
Piégsa 1 , J. Pochodzalla 1 , M. Potokar 19 , C. Rangacharyulu 20 ,
R.D. Ransome 13 , A. Richter 16 , D. Rohe 9 , G. Rosner 3 , D. Rowntree
7 , A. Sarty 21 , H. Schmieden 15 , G. Schrieder 16 , M. Seimetz 1 ,
S. ˇ Sirca 19 , I. Sick 9 , G. Tamas 1 , G. Testa 9 , M. Thompson 22 ,
R. Trojer 9 , M. Vanderhaeghen 1 , R. Van de Vyver 23 , L. Van
Hoorebeke 23 , H. de Vries 4 , Th. Walcher 1 , G. Warren 9 , D.
Watts 3 , M. Weis 1 , H. Wöhrle 9 , M. Zeier 9 , and B. Zihlmann 8
1Institut für Kernphysik, Universität Mainz, D-55099 Mainz
2California State University, Los Angeles, USA
3Department of Physics and Astronomy, University of Glasgow, Glasgow, UK
4NIKHEF, Amsterdam, The Netherlands
5LPC, Université Blaise Pascal, IN2P3-CNRS Aubiere, France
6Institut für Physik, Universität Mainz, D-55099 Mainz
7Massachusetts Institute of Technology, Cambridge, USA
8Vrije Universiteit, Amsterdam, The Netherlands
9Dept. für Physik und Astronomie, Universität Basel, CH-4056 Basel
10Department of Physics, University of Zagreb, Croatia
11Physics Department, University of Edinburgh, Scotland, UK
12CEN Saclay, DAPNIA/SPhN, Gif sur Yvette, France
13Physics Department, Rutgers University, Piscataway, USA
14Physikalisches Institut, Universität Tübingen, D-72076 Tübingen
15Physikalisches Institut, Universität Bonn, D-53012 Bonn
16Institut für Kernphysik, TU Darmstadt, D-64289 Darmstadt
17Department of Physics, University of Massachusetts, Amherst, USA
18ECT*, Villazzano, Trento, Italy
19Institut ”‘Joˇzef Stefan”’ and University of Ljubljana, Ljubljana, Slovenia
20University of Saskatchewan, Saskatoon, Canada
21Saint Mary’s University, Halifax, Nova Scotia, Canada
22School of Physics, University of Melbourne, Parkville, Australia
23 Universiteit Gent, Gent, Belgium
A2-Collaboration Collaboration
J. Ahrens 1 , J. Albert 1 , V. Alekseyev 2 , S. Alteri 3 , J.R.M.
Annand 4 , I. Anthony 4 , G. Anton 5 , H.-J. Arends 1 , R. Beck 1 ,
A. Bernstein 6 , B. Boillat 7 , A. Braghieri 3 , D. Branford 8 ,
W. Briscoe 9 , J. Brudvik 10 , C. Casselotti 1 , S. Cherepnya 2 , R.
Codling 4 , E. Downie 4 , D. Drechsel 1 , H. Dutz 11 , L Fil’kov 2 , L.
Fog 4 , K Föhl 8 , D. Glazier 4 , P. Grabmayr 12 , R Gregor 13 , T.
Hehl 12 , E. Heid 1 , V. Hejny 14 , D. Hornidge 15 , D.G. Ireland 4 , O.
Jahn 1 , S. Jansen 13 , P. Jennewein 1 , R. Kaiser 4 , V Kashevarow 2 ,
J.D. Kellie 4 , R. Kondratjev 16 , M. Korolja 17 , M Kotulla 7 , D.
Krambrich 1 , J. Krimmer 12 , B. Krusche 7 , M. Lang 1 , R. Leukel 1 ,
V. Lisin 16 , K. Livingston 4 , S. Lugert 13 , I.J.D. MacGregor 4 ,
M. Martinez 1 , J.C. McGeorge 4 , D. Menze 11 , V. Metag 13 , W.
Meyer 18 , M. Mouahid 1 , B.M.K. Nefkens 10 , R. Novotny 13 , R.O.
Owens 4 , A. Panzeri 3 , P. Pedroni 3 , M. Pfeiffer 13 , T. Pinelli 3 ,
A. Polonski 16 , S.N. Prakhov 10 , I. Preobrajenski 1 , J.W. Price 10 ,
D. Protopopescu 4 , A. Reiter 4 , G. Rosner 4 , M. Rost 1 , D.
Ryckbosch 19 , R. Sanderson 4 , S. Schadmand 13 , S. Scherer 1 , A.
Schmidt 1 , B. Schoch 11 , M. Schumacher 20 , S. Schumann 1 , B.
Seitz 20 , D. Sober 21 , A. Starostin 10 , H. Stroeher 14 , I. Supek 17 ,
G. Tamas 22 , C.M. Tarbert 8 , L. Tiator 1 , A. Thomas 1 , M. Un-

verzagt 1 , R. VanderVyver 19 , Th. Walcher 1 , D.P. Watts 8 , M.
Vanderhaeghen 1 , F. Zapadtka 20 , and F. Zehr 7
1 Institut für Kernphysik, Universität Mainz, Mainz, Germany
2 Lebedev Physical Institute, Leninscy Prospect 53, Moscow, RU
3 INFN, Sezione di Pavia, Pavia, I
4 Department of Physics and Astronomy, Glasgow University, Glasgow, UK
5 Physikalisches Institut, Universität Erlangen-Nürnberg, Erlangen, Germany
6 Massachusetts Institute of Technology, Cambridge, USA
7 Institut für Physik, Universität Basel, Basel, Ch
8 Department of Physics, University of Edinburgh, Edinburgh, UK
9 George Washington University, Washington, USA
10 University of California, Los Angeles, USA
11 Physikalisches Institut, Universität Bonn, Bonn, Germany
12 Physikalisches Institut, Universität Tübingen, Tübingen, Germany
13 II. Physikalisches Institut, Universität Gießen, Germany
14 Forschungszentrum Jülich, Jülich, Germany
15 Mount Allison University, Sackville, Canada
16 Institute for Nuclear Research, Moscow, RU
17 Rudjer Boskovic Institute, Zagreb, Croatia
18 Institut für Experimentalphysik, Ruhr-Universität, Bochum, Germany
19 Department of Subatomic and Radiation Physics RUG, Gent, B
20 II. Physikalisches Institut Göttingen, Göttingen, Germany
21 Catholic University, Washington, USA
22 CEN Saclay, DAPHNIA/SPN, Gif sur Yvette, F
A4 Collaboration
Patrick Achenbach 1 , Kurt Aulenbacher 1 , Sebastian Baunack
1 , Luigi Capozza 1 , Jürgen Diefenbach 1 , Klaus Grimm 1 ,
Yoshio Imai 1 , Thorsten Hammel 1 , Dietrich von Harrach 1 ,
Eva-Maria Kabuß 1 , Rainer Kothe 1 , Jeong-Han Lee 1 ,
Alicia Lorente 1 , Frank E. Maas 1 , Ernst Schilling 1 ,
Gerrit Stephan 1 , Christoph Weinrich 1 , Igor Altarev 2 ,
Jaques Arvieux 3 , Blaise Collin 3 , Robert Frascaria 3 , Michel
Guidal 3 , Ronald Kunne 3 , Dominique Marchand 3 , Marcel
Morlet 3 , Saroh Ong 3 , Jacques Vendewiele 3 , Stanley Kowalski
4 , Brad Plaster 4 , Riad Suleiman 4 , and Simon Taylor 4
1 Institut für Kernphysik, Univ. Mainz, J.J.Becherweg 45, D-55299 Mainz,
Germany
2 St.Petersburg Institute of Nuclear Physics, St.Petersburg,Russia
3 Institut de Physique Nucleaire, F-91406 Orsay CEDEX, France
4 Phys. Department and Laboratory for Nuclear Science, Massachusetts Institute
of Technology, Cambridge, MA 02139, USA
CBELSA/TAPS Collaboration
A. Anisovich 1 , G. Anton 2 , J. Bacelar 3 , B. Bantes 4 , J. Barth 4 ,
O. Bartholomy 1 , Y.A. Beloglazov 1,5 , R. Bogendörfer 2 , R.
Castelijns 3 , V. Credé 1 , L. Daraban 6 , H. Dutz 4 , D. Elsner 4 ,
R. Ewald 4 , I. Fabry 1 , H. Flemming 7 , K. Fornet-Ponse 4 , H.
Freiesleben 8 , M. Fuchs 1 , Ch. Funke 1 , K.-H. Glander 4 , A.B.
Gridnev 1,5 , E. Gutz 1 , S. Höffgen 4 , Ph. Hoffmeister 1 , I. Horn 1 ,
J. Hössl 2 , I. Jaegle 9 , J. Junkersfeld 1 , H. Kalinowsky 1 , Frank
Klein 4 , Fritz Klein 4 , E. Klempt 1 , H. Koch 7 , M. Konrad 4 , B.
Kopf 8 , M. Kotulla 9 , B. Krusche 9 , E. Kuhlmann 8 , H. Löhner 3 ,
I.V. Lopatin 1,5 , J. Lotz 1 , H. Matthäy 7 , D. Menze 4 , J. Messchendorp
3 , T. Mertens 9 , V. Metag 6 , C. Morales 4 , M. Nanova 6 , D.V.
Novinski 1,5 , R. Novotny 6 , M. Ostrick 4 , M. Pfeiffer 6 , D. Rhen 1 ,
A. Sarantsev 1 , S. Schadmand 6 , Ch. Schmidt 1 , H. Schmieden 4 ,
B. Schoch 4 , S. Shende 3 , G. Suft 2 , V.V. Sumachev 1,5 , T. Szcepanek
1 , A. Süle 4 , U. Thoma 6 , R. Varma 6 , D. Walther 4 , and
Ch. Weinheimer 1
1Helmholtz-Institut f. Strahlen- und Kernphysik, Univ. Bonn
2Physikalisches Institut, Univ. Erlangen
3KVI, Groningen
4Physikalisches Institut, Univ. Bonn
5Petersburg Nuclear Physics Institute, Gatchina
6Physikalisches Institut, Univ. Giessen
7Physikalisches Institut, Univ. Bochum
8Institut f. Kern- u. Teilchenphysik, TU Dresden
9Physikalisches Institut, Univ. Basel
CELSIUS-WASA Collaboration
C. Bargholtz 1 , M. Bashkanov 2 , D. Bogoslawsky 3 , A. Bondar 4 ,
Collaborations
H. Calén 5 , F. Cappellaro 6 , B. Chernyshev 7 , H. Clement 2 , J.
Comfort 8 , L. Demiroers 9 , E. Dorochkevitch 2 , C. Ekström 5 , J.
Fransson 5 , C.-J. Fridén 5 , L. Gerén 1 , V. Grebenev 7 , Y. Gurov 7 ,
L. Gustafsson 6 , B. Höistad 6 , G. Ivanov 3 , M. Jacewicz 6 , E.
Joganov 3 , A. Johansson 6 , T. Johansson 6 , S. Keleta 6 , K. Kilian
10 , N. Kimura 11 , I. Koch 6 , S. Kullander 6 , A. Kupsc 5 , L.
Kurdadze 4 , A. Kuzmin 4 , A. Kuznetsov 3 , K. Lindberg 1 , P.
Marciniewski 5 , B. Martemyanov 3 , B. Morosov 3 , R. Meier 2 , A.
Nawrot 12 , B. Nefkens 13 , W. Oelert 10 , S. Oreshkin 4 , C. Pauly 9 ,
Z. Pawlowski 14 , Y. Petukhov 3 , A. Povtorejko 3 , D. Reistad 5 ,
R.J.M.Y. Ruber 5 , S. Sandukovsky 3 , W. Scobel 9 , T. Sefzick
10 , R. Shafigulin 7 , M. Shepkin 3 , B. Shwartz 4 , V. Sidorov 4 ,
T. Skorodko 2 , V. Sopov 3 , A. Starostin 13 , J. Stepaniak 12 , A.
Sukhanov 4 , V. Tchernyshev 3 , P.-E. Tegnér 1 , P. Thörngren
Engblom 6 , V. Tikhomirov 3 , H. Toki 15 , A. Turowiecki 16 , G.J.
Wagner 2 , U. Wiedner 6 , Z. Wilhelmi 16 , K. Wilhelmsen 1 , A. Yamamoto
11 , H. Yamaoka 11 , J Zabierowski 12 , and J. Zlomanczuk 6
1 Stockholm University, Stockholm, Sweden
2 Tübingen University, Tübingen, Germany
3 Institute of Theoretical and Experimental Physics, Moscow, Russia
4 Budker Institute of Nuclear Physics, Novosibirsk, Russia
5 The Svedberg Laboratory, Uppsala, Sweden
6 Department of Radiation Sciences, Uppsala, Sweden
7 Moscow Engineering Physics Institute, Moscow, Russia
8 Arizona State University, Tempe, USA
9 Hamburg University, Hamburg, Germany
10 Forschungszentrum Jülich, Germany
11 High Energy Accelerator Research Organization, Tsukuba, Japan
12 Soltan Institute of Nuclear Studies, Warsaw and Lodz, Poland
13 University of California at Los Angeles, Los Angeles, USA
14 Institute of Radioelectronics, Warsaw, Poland
15 Research Centre for Nuclear Physics, Osaka, Japan
16 Institute of Experimental Physics, Warsaw, Poland
CERES Collaboration
D. Adamova 1 , V. Kushpil 1 , M. Sumbera 1 , G. Agakichiev 2 ,
D. Antonczyk 2 , H. Appelshäuser 2 , P. Braun-Munzinger 2 ,
O. Busch 2 , A. Castillo 2 , C. Garabatos 2 , G. Hering 2 , J.
Holeczek 2 , A. Maas 2 , S. Sedykh 2 , A. Marin 2 , D. Miskowiec 2 ,
J. Rak 2 , H. Sako 2 , G. Tsiledakis 2 , S. Damjanovic 3 , T. Dietel
3 , L. Dietrich 3 , S.I. Esumi 3 , K. Filimonov 3 , P. Glassel 3 ,
W. Ludolphs 3 , J. Milovsevic 3 , V. Petravcek 3 , W. Schmitz 3 ,
J. Slivova 3 , H.J. Specht 3 , J. Stachel 3 , H. Tilsner 3 , J.P. Wessels
3 , T. Wienold 3 , B. Windelband 3 , S. Yurevich 3 , V. Belaga 4 ,
K. Fomenko 4 , Yu. Panebrattsev 4 , O. Petchenova 4 , S. Shimansky
4 , V. Yurevich 4 , A. Cherlin 5 , Z. Fraenkel 5 , A. Gnaenski 5 ,
A. Milov 5 , I. Ravinovich 5 , I. Tserruya 5 , W. Xie 5 , A. Drees 6 , F.
Messer 6 , B. Lenkeit 7 , A. Pfeiffer 7 , J. Schukraft 7 , P. Rehak 8 ,
and J.P. Wurm 9
1 NPI ASCR, Czech Republic
2 GSI Darmstadt, Germany
3 Heidelberg University, Germany
4 JINR Dubna, Russia
5 Weizmann Institute, Rehovot, Israel
6 SUNY at Stony Brook, U.S.A.
7 CERN, Geneva, Switzerland
8 BNL, Upton, U.S.A.
9 MPI, Heidelberg, Germany
CHAOS Collaboration
P.A. Amaudruz 1 , F. Bonutti 2 , J.T. Brack 3 , J. Breitschopf 4 , P.
Camerini 2 , J. Clark 5 , H. Clement 4 , H. Denz 4 , L. Felawka 1 , E.
Fragiacomo 2 , E. Friedman 6 , E. Gibson 7 , N. Grion 2 , G.J. Hofman
3 , B. Jamieson 1 , E.L. Mathie 8 , R. Meier 4 , G. Moloney 5 , D.
Ottewell 1 , O. Patarakin 9 , J. Patterson 3 , M. Pavan 1 , R.J. Peterson
3 , K. Raywood 1 , R.A. Ristinen 3 , R. Rui 2 , M.E. Sevior 5 ,
G.R. Smith 10 , R. Tacik 8 , G.J. Wagner 4 , and F. von Wrochem 4
1 TRIUMF, 4004 Wesbrook Mall, Vancouver BC, Canada V6T 2A3
2 University and INFN Trieste, 34127 Trieste, Italy
3 University of Colorado, Boulder CO 80309-0446, USA
4 Physikalisches Institut, Universität Tübingen, Auf der Morgenstelle 14, D-
72076 Tübingen
5 School of Physics, University of Melbourne, Parkville, Victoria 3052, Aus-

tralia
6 Racah Institute of Physics, The Hebrew University, Jerusalem 91904, Israel
7 California State University, Sacramento CA 95819, USA
8 University of Regina, Regina, Saskatchewan, Canada S4S 0A2
9 RRC Kurchatov Institute, 123182 Moscow, Russia
10 Jefferson Laboratory, Newport News, VA 23606, USA
COSY-TOF Collaboration
M. Abdel-Bary 1 , K.-Th. Brinkmann 2 , H. Clement 3 , E.
Dorochkevitch 3 , M. Drochner 4 , S. Dshemuchadse 2 , H. Dutz 5 ,
G. El-Awadi 1 , W. Eyrich 6 , K. Ehrhardt 3 , A. Erhardt 3 ,
D. Filges 1 , A. Filippi 7 , H. Freiesleben 2 , M. Fritsch 6 , A.
Gillitzer 1 , P. Gonser 3 , R. Jäkel 2 , L. Karsch 2 , K. Kilian 1 , H.
Koch 8 , J. Kreß 3 , E. Kuhlmann 2 , S. Marcello 7 , S. Marwinski 1 ,
R. Meier 3 , W. Meyer 8 , K. Möller 9 , H.P. Morsch 1 , L. Naumann
9 , N. Paul 1 , L. Pinna 6 , C. Pizzolotto 6 , E. Roderburg 1 ,
P. Schönmeier 2 , M. Schulte-Wissermann 2 , W. Schroeder 6 , T.
Sefzick 1 , G.Y. Sun 2 , A. Teufel 6 , A. Ucar 1 , G.J. Wagner 3 , M.
Wagner 6 , A. Wilms 8 , P. Wintz 1 , S. Wirth 6 , P. Wüstner 4 , and
P. Zupranski 10
1Institut für Kernphysik, Forschungszentrum Jülich
2Institut für Kern- und Teilchenphysik, Technische Universität Dresden
3Physikalisches Institut, Universität Tübingen
4Zentrallabor für Elektronik, Forschungszentrum Jülich
5Physikalisches Institut der Universität Bonn
6Physikalisches Institut, Universität Erlangen
7INFN Torino
8Institut für Experimentalphysik, Ruhr-Universität Bochum
9Institut für Kern- und Hadronenphysik, Forschungszentrum Rossendorf
10Soltan Institute for Nuclear Studies, Warsaw
COSY-11 Collaboration
H.-H. Adam 1 , A. Budzanowski 2 , R. Czyzykiewicz 3 , I. Geck 1 , D.
Grzonka 4 , M. Janusz 3 , L. Jarczyk 3 , B. Kamys 3 , A. Khoukaz 1 ,
K. Kilian 4 , P. Kowina 4,5 , N. Lang 1 , P. Moskal 4,3 , W. Oelert 4 ,
C. Piskor-Ignatowicz 3 , J. Przerwa 3 , T Rozek 5 , R Santo 1 , G.
Schepers 4 , T. Sefzick 4 , M. Siemaszko 5 , J. Smyrski 3 , S. Steltenkamp
1 , A. Strza̷lkowski 3 , A. Täschner 1 , P. Winter 4 , M.
Wolke 4 , P. Wüstner 6 , and W. Zipper 5
1 Institut für Kernphysik, Westfälische Wilhelms Universität, D-48149
Münster, Germany
2 Institute of Nuclear Physics, PL-31 342 Cracow, Poland
3 Institute of Physics, Jagellonian University, PL-30 059 Cracow, Poland
4 Institut für Kernphysik, Forschungszentrum Jülich, D-52425 Jülich, Germany
5 Institute of Physics, University of Silesia, PL-40 007 Katowice, Poland
6 Zentrallabor für Elektronik, Forschungszentrum Jülich, D-52425 Jülich, Ger-
many
EDDA Collaboration
F. Bauer 1 , J. Bisplinghoff 2 , K. Büßer 1 , M. Busch 2 , T. Colberg
1 , L. Demirörs 1 , P.D. Eversheim 2 , O. Eyser 1 , O. Felden 3 ,
R. Gebel 3 , F. Hinterberger 2 , H. Krause 1 , J. Lindlein 1 , R.
Maier 3 , A. Meinerzhagen 2 , C. Pauli 1 , D. Prasuhn 3 , H. Rohdjeß
2 , D. Rosendaal 2 , P. von Rossen 3 , N. Schirm 1 , W. Scobel 1 ,
K. Ulbrich 2 , E. Weise 2 , T. Wolf 1 , and R. Ziegler 2
1 Institut für Experimentalphysik, Universität Hamburg
2 Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn
3 Institut für Kernphysik, Forschungszentrum Jülich
FOPI Collaboration
Zbigniew Tyminski
Gesellschaft für Schwerionenforschung, Darmstadt, Germany
Warsaw University, Poland
GDH Collaboration
J. Ahrens 1 , S. Altieri 2,3 , J.R.M. Annand 4 , G. Anton 5 , H.-J.
Arends 1 , R. Beck 1 , C. Bradtke 6 , A. Braghieri 2 , N. d’Hose 7 , W.
v.Drachenfels 8 , D. Drechsel 1 , H. Dutz 8 , F. Frommberger 8 , N.
Gimenez 1 , M. Godo 5 , S. Goertz 6 , P. Grabmayr 9 , K. Hansen 10 ,
J. Harmsen 6 , D. v.Harrach 1 , S. Hasegawa 11 , J. Heckmann 6 ,
T. Hehl 9 , E. Heid 1 , W. Heil 12 , K. Helbing 5 , W. Hillert 8 , L.
Collaborations
van Hoorebeke 13 , N. Horikawa 14 , D. Hornidge 1 , T. Iwata 11 ,
O. Jahn 1 , P. Jennewein 1 , F. Klein 8 , C. Klempt 1 , K. Kondo 11 ,
R. Kondratjev 15 , J. Krimmer 9 , M. Lang 1 , V. Lisin 15 , M. Martinez
1 , J.C. McGeorge 4 , D. Menze 8 , W. Meyer 6 , T. Michel 5 ,
J. Naumann 5 , A. Panzeri 2,3 , P. Pedroni 2 , T. Pinelli 2,3 , I. Preobrajenski
1 , D. Protopopescu 4 , E. Radtke 6 , T. Reichelt 8 , E.
Reichert 12 , G. Reicherz 6 , Ch. Rohlof 8 , G. Rosner 4 , T. Rostomyan
13 , D. Ryckbosch 13 , B. Schoch 8 , B. Schröder 10 , M. Schumacher
16 , T. Speckner 5 , G. Tamas 1 , A. Thomas 1 , R. van de
Vyver 13 , D. Watts 4 , W. Weihofen 16 , B. Windisch 1 , F. Zapadtka
16 , and G. Zeitler 5
1 Institut für Kernphysik, Universität Mainz, Germany
2 INFN Sezione di Pavia, Pavia, Italy
3 Dipartimento di Fisica Nucleare e Teorica, Università di Pavia, Italy
4 Department of Physics & Astronomy, University of Glasgow, U.K.
5 Physikalisches Institut, Universität Erlangen-Nürnberg, Germany
6 Institut für Experimentalphysik, Ruhr-Universität Bochum, Germany
7 CEA Saclay, DSM/DAPNIA/SPhN, Gif-sur-Yvette, France
8 Physikalisches Institut, Universität Bonn, Germany
9 Physikalisches Institut, Universität Tübingen, Germany
10 University of Lund, Department of Physics, Lund, Sweden
11 Dep. of Physics, Nagoya University, Chikusa-ku, Nagoya, Japan
12 Institut für Physik der Universität Mainz, Germany
13 Department of Subatomic and Radiation Physics RUG, Gent, Belgium
14 CIRSE, Nagoya University, Chikusa-ku, Nagoya, Japan
15 Institute of Nuclear Research, Academy of Science, Moscow, Russia
16 II. Physikalisches Institut, Universität Göttingen, Germany
GSI-ISOL Collaboration
A. Banu 1 , L. Batist 2 , F. Becker 1 , A. Blazhev 1,3 , W. Brüchle 1 ,
J. Döring 1 , T. Faestermann 4 , M. Górska 1 , H. Grawe 1 , Z.
Janas 5 , A. Jungclaus 6 , M. Karny 5 , M. Kavatsyuk 1,7 , O. Kavatsyuk
1,7 , R. Kirchner 1 , M. La Commara 8 , S. Mandal 1 , C.
Mazzocchi 1,9 , I. Mukha 1 , S. Muralithar 1,10 , C. Plettner 1 ,
A. P̷lochocki 5 , E. Roeckl 1 , M. Romoli 8 , M. Schaedel 1 , R.
Schwengner 11 , B. Sulignano 1 , and J. ˙ Zylicz 5
1Gesellschaft für Schwerionenforschung, D-64291 Darmstadt, Germany
2St. Petersburg Nuclear Physics Institute, RU-188-350 Gatchina, Russia
3University of Sofia, BG-1164 Sofia, Bulgaria
4Physik Dept., Technische Universität München, D-85748 Garching, Germany
5Institute of Experimental Physics, University of Warsaw, PL-00681 Warsaw,
Poland
6Departamento de Fisica Teórica, Universidad Autónoma de Madrid, E-28049
and Instituto Estructura de la Materia, CSIC, E-28006 Madrid, Spain
7Kiev National University, UA-03061 Kiev, Ukraine
8Dipartimento di Scienze Fisiche, Universitá di Napoli “Federico Secundo”,
I-80126 Napoli, Italy
9Universitá degli Studi di Milano, I-20133 Milano, Italy
10Nuclear Science Center, post box 10502, 110067 New Delhi, India
11Institut für Kern- und Hadronenphysik, Forschungszentrum Rossendorf, D-
01314 Dresden, Germany
ISOLTRAP Collaboration
Georges Audi 1 , Dietrich Beck 2 , Klaus Blaum 2,3 , Michael
Block 2 , Georg Bollen 4 , Pierre Delahaye 3 , Celine Guenaut 1 ,
Sophie Heinz 5 , Frank Herfurth 3 , Alexander Herlert 6 , Alban
Kellerbauer 3 , H.-Jürgen Kluge 2 , David Lunney 1 , Manas
Mukherjee 2 , Daniel Rodriguez 2 , Christoph Scheidenberger 2 ,
Stefan Schwarz 4 , Lutz Schweikhard 6 , Christine Weber 2 , and
Chabouh Yazidjian 2
1 CSNSM-IN2P3-CNRS, 91405 Orsay-Campus, France
2 GSI, Planckstraße 1, 64291 Darmstadt
3 CERN, Division EP, 1211 Geneva 23, Switzerland
4 NSCL, Michigan State University, East Lansing, MI 48824-1321, USA
5 Inst. f. Physik, Ludwig-Maximilians-Universität, 85748 München, Germany
6 Inst. f. Physik, Ernst-Moritz-Arndt-Universität, 17487 Greifswald, Germany
JESSICA Collaboration
K. Nünighoff 1 , V. Bollini 1 , A. Bubak 1 , H. Conrad 1 , P.D.
Ferguson 2 , D. Filges 1 , F. Goldenbaum 1 , E.B. Iverson 1 , S.
Koulikov 3 , B. Lensing 1 , R.-D. Neef 1 , W. Ninaus 4 , N. Paul 1 ,
Ch. Pohl 1 , D. Prasuhn 1 , K. Pysz 1 , H. Schaal 1 , A. Smirnov 3 ,

H. Soltner 1 , H. Glückler 1 , H. Stelzer 1 , H. Tietze-Jaensch 1 ,
and M. Wohlmuther 1
1Forschungszentrum Jülich, 52425 Jülich
2SNS-Oak Ridge National Laboratory, 701 Scarboro Road, Oak Ridge, Tennessee,
USA
3Joint Institute of Nuclear Research, Dubna, Russia
4Institut für Technische Physik, Technische Universität Graz, Petersgasse 16,
8010 Graz, Austria
KaoS Collaboration
A. Förster 1 , E. Grosse 2,3 , P. Koczoń 4 , B. Kohlmeyer 5 ,
S. Lang 1 , L. Naumann 2 , H. Oeschler 1 , M. P̷loskoń 4 , W.
Scheinast 2 , A. Schmah 1 , T. Schuck 6 , E. Schwab 4 , P. Senger 4 , H.
Ströbele 6 , C. Sturm 4 , F. Uhlig 1 , A. Wagner 2 , and W. Walu´s 7
1 Technische Universität Darmstadt, D-64289 Darmstadt, Germany
2 Forschungszentrum Rossendorf, D-01314 Dresden, Germany
3 Technische Universität Dresden, D-01062 Dresden, Germany
4 Gesellschaft für Schwerionenforschung, D-64220 Darmstadt, Germany
5 Phillips Universität, D-35037 Marburg, Germany
6 Johann Wolfgang Goethe-Universität, D-60325 Frankfurt am Main, Germany
7 Uniwersytet Jagielloński, PL-30-059 Kraków, Poland
KATRIN Collaboration
K. Essig 1 , B. Müller 1 , T. Thümmler 1 , C. Weinheimer 1 , J. Herbert
2 , O. Malyshev 2 , R. Reid 2 , A. Osipowicz 3 , T. Armbrust 4 , H.
Blümer 4,5 , L. Bornschein 4 , F. Eichelhardt 4 , F. Schwamm 4 , J.
Wolf 4 , G. Drexlin 5 , K. Eitel 5 , R. Gumbsheimer 5 , H. Hucker 5 ,
O. Huianu 5 , P. Plischke 5 , H. Skacel 5 , B. Schüssler 5 , M.
Steidl 5 , A. Beglarian 6 , H. Gemmeke 6 , S. Wüstling 6 , S. Bobien
7 , C. Day 7 , R. Gehring 7 , K.-P. Jüngst 7 , P. Komarek 7 , A.
Kudymov 7 , X. Luo 7 , H. Neumann 7 , M. Noe 5 , B. Bornschein 8 ,
L. Dörr 8 , M. Glugla 8 , S. Mutterer 8 , J. Bonn 9 , B. Flatt 9 ,
F. Glück 9 , C. Kraus 9 , E.W. Otten 9 , S. Sanchez Majos 9 ,
V. Aseev 10 , E. Geraskin 10 , O. Kazachenko 10 , V. Lobashev 10 ,
B. Stern 10 , N. Titov 10 , S. Zadoroghny 10 , Y. Zakharov 10 , O.
Dragoun 11 , J. Kaˇspar 11 , A. Kovalík 11 , M. Ryˇsav´y 11 , A. ˇ Spalek 11 ,
D. Venos 11 , M. Zboril 11 , D.L. Wark 12 , M. Charlton 13 , A.J.
Davies 13 , H.H. Telle 13 , T. Burritt 14 , P.J. Doe 14 , J. Formaggio
14 , G. Harper 14 , M. Howe 14 , M. Leber 14 , K. Rielage 14 , R.G.H.
Robertson 14 , T. Van Wechel 14 , and J.F. Wilkerson 14
1Rheinische Friedrich-Wilhelms-Universität Bonn, Helmholtz-Institut für
Strahlen- und Kernphysik, Nussallee 14-16, 53115 Bonn
2ASTeC, CCLRC-Daresbury Laboratory, Daresbury, Warrington, Cheshire
WA4 4AD, United Kingdom
3University of Applied Sciences (FH) Fulda, Marquardtstr. 35, 36039 Fulda
4Universität Karlsruhe (TH), IEKP, Gaedestr. 1, 76128 Karlsruhe
5Forschungszentrum Karlsruhe, IK, Postfach 3640, 76021 Karlsruhe
6Forschungszentrum Karlsruhe, IPE, Postfach 3640, 76021 Karlsruhe
7Forschungszentrum Karlsruhe, ITP, Postfach 3640, 76021 Karlsruhe
8Forschungszentrum Karlsruhe, TLK, Postfach 3640, 76021 Karlsruhe
9Johannes Gutenberg-Universität Mainz, Institut für Physik, 55099 Mainz
10 th Academy of Sciences of Russia, Institute for Nuclear Research, 60 October
Anniversary Prospect 7a, 117312 Moscow, Russia
11Academy of Sciences of the Czech Republic, Nuclear Physics Institute, CZ-
250 68 ˇReˇz near Prague, Czech Republic
12Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, United
Kingdom
13Department of Physics, University of Wales Swansea, Singleton Park,
Swansea SA2 8PP, United Kingdom
14Center for Experimental Nuclear Physics and Astrophysics, and Department
of Physics, University of Washington, Seattle, WA 98195, USA
LENS Collaboration
Dario Motta 1 , Christian Buck 1 , Francis Xavier Hartmann 1 ,
Thierry Lasserre 2 , Stefan Schönert 1 , and Ute Schwan 1
1 Max Planck Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg
2 CEA/Saclay, DAPNIA/SPP, 91191 Gif-Sur-Yvette, France
Panda (Dt.) Collaboration
P. Achenbach 1 , K.-T. Brinkmann 2 , H. Clement 3 , V. Credé 4 ,
M.G. De Stefanis 5 , R. Dörner 6 , E. Doroshkevitch 3 , M.
Collaborations
Düren 5 , K. Ehrhardt 3 , W. Eyrich 7 , H. Freiesleben 2 , D. Frekers
8 , I. Fröhlich 5 , A. Gillitzer 9 , R. Grisenti 6 , M. Hartig 5 ,
O. Hartmann 10 , V. Hejny 9 , T. Held 11 , F. Hinterberger 4 , R.
Jäkel 2 , M. Kaesz 6 , B. Ketzer 12 , A. Khoukaz 8 , D.G. Kirschner 5 ,
H. Koch 11 , I. Konorov 12 , B. Kopf 11 , W. Kühn 5 , A. Lehmann 7 ,
B. Lewandowski 11 , U. Lynen 10 , R. Meier 3 , V. Metag 5 , R.
Novotny 5 , H. Orth 10 , S. Paul 12 , K. Peters 11 , M. Pfeiffer
5 , J. Pochodzalla 1 , D. Prasuhn 9 , J. Ritman 5 , H. Rohdjeß
4 , C. Schwarz 10 , A. Sanchez Lorente 1 , S. Schadmand 5 , L.
Schmitt 12 , B. Seitz 5 , C. Sfienti 10 , S. Sibirtsev 9 , A. Sokolov 10,5 ,
T.R. Saitoh 10 , M. Steinke 11 , H. Stenzel 5 , H. Ströher 9 , A.
Täschner 8 , Q. Weitzel 12 , and A. Wilms 11
1Institut für Kernphysik, Johannes Gutenberg-Universität Mainz
2Technische Universität Dresden
3Physikalisches Institut, Universität Tübingen
4Helmholtz-Institut für Strahlen und Kernphysik Bonn
5Justus Liebig-Universität Gießen
6Johann Wolfgang Goethe-Universität Frankfurt
7Friedrich Alexander Universität Erlangen-Nürnberg
8Westfälische Wilhems-Universität Münster
9Institut für Kernphysik, Forschungszentrum Jülich
10Gesellschaft für Schwerionenforschung mbH
11Ruhr-Universität Bochum
12Technische Universität München
QCDSF and UKQCD Collaboration
A. Ali Khan 1 , T. Bakeyev 2 , M. Göckeler 3,4 , T.R. Hemmert 5 ,
R. Horsley 6 , A.C. Irving 7 , D. Pleiter 8 , P.E.L. Rakow 7 , G.
Schierholz 8,9 , and H. Stüben 10
1 Institut f. Physik, HU Berlin
2JINR, Dubna
3Institut f. Theoretische Physik, U. Leipzig
4Institut f. Theoretische Physik, U. Regensburg
5Physik Department T39, TU München
6School of Physics, The University of Edinburgh
7Department of Mathematical Sciences, University of Liverpool
8NIC, Zeuthen
9DESY, Hamburg
10Konrad-Zuse-Zentrum f. Informationstechnik, Berlin
R3B Collaboration
T. Aumann 1 , Ch.-O. Bacri 2 , J. Benlliure 3 , M. Bentley 4 , M.
Böhmer 5 , M.J.G. Borge 6 , W. Catford 7 , M. Chartier 8 , L.V.
Chulkov 9,1 , D. Cortina-Gil 3 , D. Cullen 10 , A. Dael 11 , J.-E.
Ducret 11 , H. Emling 1 , L.M. Fraile 6 , S. Freeman 10 , M. Freer 12 ,
J. Friese 5 , H.O.U. Fynbo 13 , B. Gastineau 11 , H. Geissel 1,14 , B.
Gelletly 7 , R. Gernhäuser 5 , J. Hoffmann 1 , B. Jonson 15 , M. Kajetanowicz
16 , O. Kiselev 17 , K. Korcyl 16 , A. Krasznahorkay 18 ,
J.V. Kratz 17 , R. Krücken 5 , R. Kulessa 16 , N. Kurz 1 , R.C. Lemmon
19 , W. Mittig 20 , G. Münzenberg 1,21 , T. Nillson 22 , G. Nyman
15 , P. Regan 7 , P. Reiter 23 , K. Riisager 13 , P. Roussell-
Chomaz 20 , K.-H. Schmidt 1 , G. Schrieder 22 , B.M. Sherrill 24 , H.
Simon 1,22 , J. Simpson 7 , K. Sümmerer 1 , O. Tengblad 6 , V. Vysotsky
11 , A. Wagner 25 , P. Walker 7 , D. Warner 19 , H. Weick 1 , and
M. Winkler 1,14
1 Gesellschaft für Schwerionenforschung mbH (GSI), D-64291 Darmstadt
2 IN2P3/IPN Orsay, F-91406 Orsay, France
3 Univ. de Santiago de Compostela, E-15706 Santiago de Compostela, Spain
4 University of Keele, Staffordshire ST5 5BG, UK
5 Physik Department, TU München, D-85747 Garching München
6 Intituto de Estructura de la Materia, CSIC, E-28006 Madrid, Spain
7 Department of Physics, University of Surrey, Guildford, GU2 5XH, UK
8 Department of Physics, University of Liverpool, Liverpool L69 7ZE, UK
9 RRC Kurchatov Institute, RU-123182 Moscow, Russia
10 University of Manchester, Manchester, M13 9PL, UK
11 CEA, Saclay, F-91191 Gif-sur Yvette, France
12 University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
13 Inst. of Phys. and Astronomy, Univ. of Aarhus, DK-8000 Aarhus, Denmark
14 II. Physikalisches Institut, Universität Giessen, D-35392 Giessen
15 Chalmers Tekniska Högskola, SE-41296 Göteborg, Sweden
16 Fizyki, Uniwersytet Jagellonski, PL-30059 Krakow, Poland
17 Institut für Kernchemie, Johannes Gutenberg Universität, D-55099 Mainz
18 Institute of Nuclear Research (ATOMKI), H-4001 Debrecen, Hungary

19 CLRC Daresbury, Warrington, Cheshire, WA4 4AD, UK
20 GANIL, BP 5027, 14021 Caen Cedex 5, France
21 Institut für Physik, Johannes Gutenberg Universität, D-55099 Mainz
22 Institut für Kernphysik, TU Darmstadt, D-64289 Darmstadt
23 Institut für Kernphysik, Universität zu Köln, D-50937 Köln
24 NSCL, Michigan State University, East Lansing, Michigan 48824, USA
25 Forschungszentrum Rossendorf, D-01314 Dresden
REX-ISOLDE Collaboration
D. Habs 1 , O. Kester 1 , S. Emhofer 1 , M. Schumann 1 , J. Cederkäll
1 , P. Thirolf 1 , K. Rudolph 1 , F. Ames 1 , M. Pasini 1 , W.
Schwerdtfeger 1 , T. Morgan 1 , R. Lutter 1 , R. Krücken 2 , T.
Kröll 2 , T. Faestermann 2 , P. Butler 3 , T. Nilsson 3 , F. Wenander
3 , T. Sieber 3 , U. Bergmann 3 , M. Lindroos 3 , P. Delahaye
3 , G. Huber 4 , S. Franchoo 4 , R. von Hahn 5 , R. Repnow 5 ,
D. Schwalm 5 , H. Scheit 5 , M. Lauer 5 , O. Niedermaier 5 , V. Bildstein
5 , H. Boie 5 , B. Jonsson 6 , G. Nyman 6 , K. Markenroth 6 , A.
Schempp 7 , U. Ratzinger 7 , P. van Duppen 8 , M. Huyse 8 , P. van
den Bergh 8 , P. Mayet 8 , O. Ivanov 8 , A. Shotter 9 , T. Davinson 9 ,
P.J. Woods 9 , A. Richter 10 , G. Shrieder 10 , M. Pantea 10 , H. Simon
10 , O. Tengblad 11 , P. Reiter 12 , J. Eberth 12 , N. Warr 12 , and
D. Weisshaar 12
1 LMU München, Am Coulombwall 1, D-85748 Garching
2 TU München, James Franck Strasse, D-85748 Garching
3 CERN, CH-1211 Geneva 23, Switzerland
4 Johannes-Gutenberg-Universität, D-55099 Mainz
5 MPI für Kernphysik, Postfach 103980, D-69029 Heidelberg
6 Chalmers University of Technology, Gothenburg, Sweden
7 Universität Frankfurt, Robert-Mayer-Str. 2-4, D-60325 Frankfurt
8 K.U. Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium
9 University of Edinburgh, GB-Edinburgh EH9 3JZ, Scotland
10 TU Darmstadt, Schlossgartenstr. 9, D-64289 Darmstadt
11 CSIC, C/Serrano 121, E-28006 Madrid, Spain
12 Institut für Kernphysik, Universität Köln
REX-MINIBALL Collaboration
F. Aksouh 1 , C. Alvarez 2 , F. Ames 2 , T. Behrens 3 , V. Bildstein
4 , H. Boie 4 , J. Cederkäll 5 , P. Van Duppen 1 , J. Eberth 6 ,
S. Emhofer 2 , J. Fitting 4 , S. Franchoo 5 , R. Gernhäuser 3 , G.
Gersch 6 , D. Habs 2 , H. Hess 6 , M. Huyse 1 , O. Ivanov 1 , J. Iwanicki
7 , O. Kester 2 , T. Kröll 3 , R. Krücken 3 , M. Lauer 4 , R. Lutter
3 , P. Mayet 1 , M. Münch 3 , O. Niedermaier 4 , U.K. Pal 4 , M.
Pantea 8 , M. Pasini 2 , P. Reiter 6 , H. Scheit 4 , A. Scherillo 6 , G.
Schrieder 8 , D. Schwalm 4 , T. Sieber 5 , H. Simon 8 , O. Thelen 6 , P.
Thirolf 2 , J. van de Walle 1 , N. Warr 6 , and D. Wei¨shaar 6
1 Instituut voor Kern- en Stralingsfysica, University of Leuven, Leuven, Bel-
gium
2Ludwig-Maximilians-Universität München, München, Germany
3Technische Universität München, München, Germany
4Max-Planck-Institut für Kernphysik, Heidelberg, Germany
5CERN, Geneva, Switzerland
6Institut für Kernphysik, Universität Köln, Köln, Germany
7Oliver Lodge Laboratory, University of Liverpool, UK
8Technische Universität Darmstadt, Darmstadt, Germany
RISING Collaboration
A. Al-Khatib 1 , D. Balabanski 2 , A. Banu 3 , C.J. Barton 4 , T.
Beck 3 , F. Becker 3 , P. Bednarczyk 3 , K.-H. Behr 3 , M.A. Bentley
5 , G. Benzoni 6 , N. Blasi 6 , A. Bracco 6 , S. Brambilla 6 , P.
Bringel 1 , A.M. Bruce 7 , A. Brünle 3 , A. Bürger 1 , L.C. Bullock
5 , K.-H. Burkhard 3 , P. Butler 8 , F. Camera 6 , M. Castolsi 9 ,
C. Chandler 5 , E. Clement 10 , F. Cristancho-Mejia 11 , G. de Angelis
12 , J. Devin 13 , Zs. Dombradi 14 , J. Döring 3 , P. Doornenbal
3 , J. Eberth 15 , C. Fahlander 11 , H. Geissel 3 , J. Gerber 13 ,
J. Gerl 3 , A. Görgen 10 , M. Górska 3 , H. Grawe 3 , J. Grebosz 3 ,
R. Griffiths 16 , G. Hammond 5 , M. Hellström 3 , H. Hübel 1 , J.
Jolie 15 , D. Judson 7 , J.V. Kalben 17 , O. Kenn 1 , B. Kindler 3 ,
M. Kmiecik 18 , I. Kojouharov 3 , Y. Kopach 3,19 , W. Korten 10 , R.
Kulessa 20 , N. Kurz 3 , I. Lazarus 16 , J. Leske 1 , J. Li 3,21 , G. Lo
Bianco 22 , B. Lommel 3 , R. Lozeva 2,3 , A. Maj 18 , S. Mandal 3 , N.
Marginean 12 , B. McGuirk 8 , W. Meczynski 18 , D. Mehta 1,23 , B.
Million 6 , S. Muralithar 3,24 , M. Mutterer 17 , G. Münzenberg 3 ,
A. Neusser 1 , P. Nolan 8 , J. Nyberg 25 , E.S. Paul 8 , C. Petrache 22 ,
Collaborations
Zs. Podolyák 26 , W. Prokopowicz 3 , V.F.E. Pucknell 16 , T.S.
Reddy 1,27 , P.H. Regan 26 , P. Reiter 15 , D. Rudolph 11 , C. Rusu 12 ,
N. Saito 3 , T.R. Saitoh 3 , H. Schaffner 3 , S. Schielke 1 , J. Simpson
16 , A.K. Singh 1 , D. Sohler 14 , K.-H. Speidel 1 , J. Steiner 3 ,
H. Stelzer 3 , J. Styczen 18 , M.J. Taylor 7 , D.D. Warner 16 , N.
Warr 15 , H. Weick 3 , C. Wheldon 3 , O. Wieland 6 , M. Winkler 3 ,
H.-J. Wollersheim 3 , and M. Zieblinski 18
1 Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, 53115
Bonn, Germany
2Faculty of Physics, Univ. of Sofia, “St. Kl. Ohridski”, 1164 Sofia, Bulgaria
3GSI Darmstadt, Planckstr. 1, 64291 Darmstadt, Germany
4Department of Physics, Univ. of York, Heslington, York YO10 5DD, UK
5School of Chemistry and Physics, Keele University, Staffordshire, ST5 5BG,
United Kingdom
6University of Milano and INFN, Milano, Italy
7School of Engineering, University of Brighton, Brighton, BN2 4GJ, UK
8Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, UK
9INFN-Genova, Italy
10DAPNIA/SPhN, CEA Saclay, 91191 Gif-sur-Yvette, France
11Department of Physics, Lund University, 22100 Lund, Sweden
12INFN, Laboratori Nazionali di Legnaro, Padova, Italy
13Institute de Recherches Subatomique, F-67037 Strasbourg, France
14Institute for Nuclear Research, Debrecen, Hungary
15Institut für Kernphysik der Universität zu Köln, 50937 Köln, Germany
16CCLRC Daresbury Laboratory, Daresbury, Warrington, WA4 4AD, UK
17TU Darmstadt, Darmstadt, Germany
18The Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy
of Sciences, ul. Radzikowskiego 152, 31-342 Krakow, Poland
19Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research,
141980 Dubna, Russia
20Insitute of Physics, Jagelonian University, ul. Reymonta 4, Krakow, Poland
21Institute of Modern Physics, the Chinese Academy of Science, P.O. Box 31,
Lanzhou 730000, China
22 University of Camerino, Dipartimento di Matematica e Fisica, via Madonna
delle Carceri, 62032 Camerino, Italy
23 Department of Physics, Panjab University, India
24 NSC, New Delhi, India
25 Department of Radiation Sciences, Uppsala University, Sweden
26 University of Surrey, Guildford, Surrey, GU2 7XH, UK
27 Dept. of Nuclear Physics, Andhra University, India
S221 Collaboration
P. Adrich 1,2 , T. Aumann 1 , K. Boretzky 3 , D. Cortina-Gil 4 , U.
Datta Pramanik 1 , Th.W. Elze 5 , H. Emling 1 , M. Fallot 1 , H.
Geissel 1 , M. Hellström 1 , K.L. Jones 1 , A. Klimkiewicz 1,2 , J.V.
Kratz 3 , R. Kulessa 2 , Y. Leifels 1 , C. Nociforo 3 , R. Palit 5 , H.
Simon 6 , G. Surowka 2 , K. Sümmerer 1 , and W. Walus 2
1Gesellschaft für Schwerionenforschung (GSI), D-64291 Darmstadt
2Instytut Fizyki, Uniwersytet Jagelloński, PL-30-059 Kraków, Poland
3Institut für Kernchemie, Johannes Gutenberg Universität, D-55099 Mainz
4Universidad de Santiago de Compostela, 15706, Santiago de Compostela,
Spain
5IKF, Johann Wolfgang Goethe Universität,D-60486 Frankfurt
6Institut für Kernphysik, Technische Universität, D-64289 Darmstadt
SHIPTRAP Collaboration
Michael Block 1 , D. Ackermann 1 , D. Beck 1 , S. Eliseev 2 , H.
Geissel 1,2 , D. Habs 3 , S. Heinz 3 , F. Hessberger 1 , S. Hofmann 1 , G.
Marx 4 , M. Mukherjee 1 , J. Neumayr 3 , H.-J. Kluge 1 , W. Plass 2 ,
W. Quint 1 , S. Rahaman 1 , D. Rodríguez 1 , C. Scheidenberger 1 ,
G. Sikler 1 , P. Thirolf 3 , Z. Wang 2 , and C. Weber 1
1 GSI, Planckstr.1, 64291 Darmstadt
2 Justus Liebig Universität, Heinrich Buff Ring 16, D-35392 Giessen
3 LMU, Am Coulombwall 1, 85748 Garching
4 Ernst Moritz Arndt Universität, Domstrasse 10a, D-17489 Greifswald
Super-FRS Collaboration
T. Aumann 1 , K.H. Behr 1 , M. Böhmer 2 , A. Brünle 1 , K.
Burkard 1 , J. Benlliure 3 , D. Cortina-Gil 3 , L. Chulkov 1,4 , A.
Dael 5 , J.-E. Ducret 5 , H. Emling 1 , B. Franczak 1 , G. Fehrenbacher
1 , J. Friese 2 , B. Gastineau 5 , H. Geissel 1,6 , J. Gerl 1 , R.
Gernhäuser 2 , H. Iwase 1 , B. Jonson 7 , R. Kulessa 8 , B. Kindler 1 ,

N. Kurz 1 , B. Lommel 1 , W. Mittig 9 , G. Moritz 1 , C. Mühle 1 ,
G. Münzenberg 1,10 , J.A. Nolen 11 , G. Nyman 7 , T. Radon 1 , P.
Roussell-Chomaz 9 , C. Scheidenberger 1 , K.-H. Schmidt 1 , G.
Schrieder 12 , B.M. Sherrill 13 , H. Simon 12 , K. Sümmerer 1 , N.A.
Tahir 14 , V. Vysotsky 5 , H. Weick 1 , M. Winkler 1,6 , H. Wollnik 6 ,
N. Yao 6 , M. Yavor 15 , and A.F. Zeller 13
1 Gesellschaft für Schwerionenforschung, D-64291 Darmstadt
2 Physik Department, TU München, D-85747 Garching München
3 Universidade de Santiago de Compostela, E-15706 Santiago de Compostela
4 RRC Kurchatov Institute 123182 Moskow, Russia
5 CEA, Saclay, F-91191 Gif-sur Yvette, France
6 II. Physikalisches Institut,Universität Giessen, D-35392 Giessen
7 Chalmers Tekniska Högskola, S-41296 Göteborg, Sweden
8 Fizyki, Uniwersytet Jagellonski, PL-30059 Krakow, Poland
9 GANIL, BP 5027, 14021 Caen Cedex 5, France
10 Institut für Physik, Universität Mainz, D-55099 Mainz
11 Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
Collaborations
12 Institut für Kernphysik, TU Darmstadt, D-64289 Darmstadt
13 NSCL, Michigan State University, East Lansing, MI 48824, USA
14 Institut für Theoretische Physik, Universität Frankfurt D-60054 Frankfurt
15 Institute of Analytic Instrumentation, RAS, 198103 St. Petersburg, Russia
TRIC Collaboration
M. Beyer 1 , J. Dietrich 2 , J. Ernst 3 , P.D. Eversheim 3 ,
O. Felden 2 , R. Gebel 2 , F. Hinterberger 3 , R. Jahn 3 , W.
Kretschmer 4 , A. Lehrach 2 , D. Prahsuhn 2 , H. Rohdjeß 3 , D.
Samuel 3 , and H. Paetz gen. Schieck 5
1 Max Planck AG ”Theoretische Vielteilchenphysik ”, Universität Rostock,
Germany
2Institut für Kernphysik, Forschungszentrum Jülich, Jülich, Germany
3Helmholtz Institut für Strahlen- und Kernphysik der Universität Bonn, Germany
4Physikalisches Institut der Universität Erlangen, Germany
5Institut für Kernphysik der Universität zu Köln, Germany

A1 - Collaboration ...HK 9.2, HK 31.7
A2 - Collaboration ............ HK 3.7
A2-collaboration - Collaboration
HK 11.35, HK 17.10, HK 27.2
A4 - Collaboration .... HK 12.31,
HK 12.32, HK 31.8, HK 31.9
Abele, Hartmut ..............HK 48.9
Achenbach, Patrick .......... HK 31.7
Ackermann, Wolfgang ........HK 25.2
Adachi, T. ....................HK 3.9
Adam, Heinz-Hermann .......HK 30.4
Adamian, G. G. ..............HK 33.4
Adrich, Przemys̷law ..........HK 23.7
Agakichiev, Hejdar ...........HK 31.2
AGATA - Collaboration ........HK 4.2
Aguilera, Deborah Nancy .....HK 28.7
Ahmed, M. W. ....HK 10.14, HK 16.7
Ahrens, J. ..................HK 11.34
Al-khatib, A. ...HK 10.6, HK 10.7,
HK 10.8, HK 16.9
ALADIN-INDRA - Collaboration
HK 33.1, HK 33.3
ALICE - Collaboration ...HK 12.38,
HK 14.15, HK 18.5
Alice High Level Trigger - Collaboration
HK 18.6
ALICE TRD - Collaboration . HK 7.9,
HK 12.39, HK 12.40, HK 45.5,
HK 45.6, HK 45.9
ALICE-HLT - Collaboration .. HK 18.7
ALICE-TRD - Collaboration .HK 12.42
Alkofer, Reinhard ...HK 40.1, HK 46.8
Alonso, C. E. ..... HK 10.23, HK 35.3
Alt, C. HK 14.11, HK 14.12, HK 21.1,
HK 21.5, HK 21.6, HK 21.7,
HK 21.8, HK 21.9
Altarev, Igor ...... HK 12.16, HK 45.4
Alvarez, C. ...... HK 10.21, HK 12.13
Alvarez-Ruso, Luis ............ HK 5.7
Ames, F. .................... HK 43.6
Amir-Ahmadi, H. ..... HK 3.3, HK 3.4
Amir-Ahmadi, Hamid Reza ..HK 11.33
Anagnostopoulos, D. F. ....... HK 3.1
Andreyev, Andrey ............HK 37.3
Angelov, Venelin .............HK 45.5
Anisovich, Alexey ...........HK 10.22
ANKE - Collaboration ...HK 11.16,
HK 11.17, HK 11.18, HK 11.19,
HK 18.11, HK 30.5, HK 30.8,
HK 30.9, HK 45.2, HK 45.3
Antonenko, N. V. ............HK 33.4
Antończyk, Dariusz .......... HK 21.3
Appelshäuser, Harald ........ HK 21.2
Arenhövel, Hartmuth ..........HK 3.5
Arias, P. ..........HK 10.23, HK 35.3
Arickx, Frans ................ HK 6.10
Aste, Andreas ............... HK 7.10
Atchison, F. ................. HK 42.2
ATRAP - Collaboration ...... HK 37.2
Attallah, F. ...........HK 2.2, HK 2.4
Audouin, L. ................ HK 10.26
Augustinski, G. ....HK 12.43, HK 45.7
Aumann, T. ................. HK 12.7
Aumann, Thomas .............HK 2.1
Averbeck, Ralf ................HK 7.1
Axiotis, M. ....... HK 10.18, HK 29.1
Ayerbe, Carlos ...............HK 31.7
BaBar - Collaboration ...HK 11.39,
HK 18.9, HK 22.2, HK 44.7
Babilon, M. .. HK 10.13, HK 10.14,
HK 19.5, HK 19.7, HK 19.8,
HK 34.1, HK 42.7
Bacelar, J. C.S. .......HK 3.3, HK 3.4
Baechler, Sébastien ........... HK 4.6
Baessler, Stefan ............. HK 48.7
Bäumer, C. HK 3.8, HK 37.4, HK 43.2,
HK 43.7
Baeßler, Stefan .............HK 12.27
Baeßler, Stefan .............HK 12.19
Balabanski, D. ...............HK 10.5
Balabanski, Dimiter ..........HK 16.3
Balanutsa, V. ................HK 45.3
Banicz, Karoly ...............HK 45.8
Banu, A. .................... HK 10.6
Banu, Adriana ...............HK 23.4
Baran, V. ................... HK 41.4
Barea, J. ......... HK 10.23, HK 35.3
Bartholomy, Olivia ...........HK 30.6
Bartz, Ulrich ............... HK 12.21
Baru, Vadim ....... HK 11.7, HK 11.9
Barz, Hanns-Werner ......... HK 47.3
Bashkanov, M. ..... HK 27.6, HK 38.4
Bathe, Stefan .............. HK 14.14
Baunack, Sebastian .........HK 12.29
Baur, Gerhard ............... HK 7.10
Bayer, W. HK 12.2, HK 19.5, HK 19.7,
HK 19.8, HK 34.1, HK 42.7
Bazzacco, D. ..HK 10.24, HK 18.10,
HK 29.1, HK 29.5
Bechstedt, Ulf ...............HK 25.1
Beck, C. ................... HK 10.19
Beck, D. .................... HK 43.6
Beck, M. ....................HK 43.6
Beck, R. ................... HK 11.35
Beck, T. .................... HK 10.6
Becker, F. ...................HK 10.6
Becker, Frank ................ HK 2.8
Becker, M. ................. HK 11.38
Becker, Matthias ............ HK 31.6
Beckert, K. .. HK 2.2, HK 2.4, HK 2.6
Bednarczyk, P. .. HK 10.5, HK 10.6,
HK 10.7
Beisert, N. .................. HK 46.2
Beller, P. .... HK 2.2, HK 2.4, HK 2.6
Bemmerer, Daniel ........... HK 15.4
Benczer-Koller, N. ........... HK 23.1
Benlliure, J. ...HK 10.26, HK 33.6,
HK 41.6
Benlliure, Jose ...............HK 12.6
Bentley, M. A. ................HK 2.8
Benzoni, G. ................. HK 10.6
Berg, G. P.A. HK 3.9, HK 4.8, HK 12.5
Berger, Katharina ............HK 32.1
Bernard, V. ...................HK 5.6
Bernard, Véronique ......... HK 13.10
Bernas, M. ................. HK 10.26
Bernstein, L. ................ HK 23.1
Beyer, M. ....HK 13.13, HK 14.4,
HK 20.5, HK 46.1
BGR [Bern - Graz - Regensburg] -
Collaboration ........... HK 26.4
Biermann, Peter ....HK 15.7, HK 42.8
Bildstein, Vinzenz HK 10.16, HK 12.37
Biri, S. ....................... HK 3.1
Bisplinghoff, Jens . HK 11.37, HK 17.2
Blaschke, David ............. HK 28.7
BLAUM, K. ................. HK 16.4
Blaum, Klaus ...... HK 2.3, HK 12.28
Bleicher, Marcus .............HK 40.4
Block, M. .................... HK 4.4
Block, Michael .............. HK 33.2
Blume, C. ... HK 14.11, HK 14.12,
HK 21.1, HK 21.5, HK 21.6,
HK 21.7, HK 21.8, HK 21.9
Blume, Christoph ............. HK 7.9
Bodek, K. ...................HK 42.2
Böhmer, M. ................ HK 18.10
Boffi, Sigfrido ................ HK 3.6
Bohlen, H. G. ....HK 10.18, HK 10.19
Boie, Hans .......HK 10.16, HK 12.37
Bongers, H. ................. HK 25.3
Borasoy, B. ........ HK 13.7, HK 46.2
Borasoy, Bu¯gra .....HK 13.6, HK 46.3
Borchert, G. ..................HK 3.1
Borgs, W. ................... HK 45.3
BORREMANS, D. ........... HK 16.4
Borremans, Dana ............ HK 16.3
Bosch, F. .... HK 2.2, HK 2.4, HK 2.6
Botvina, A. S. ............... HK 33.6
Boutin, D. . HK 2.2, HK 2.4, HK 2.6,
HK 10.20
Bracco, A. HK 10.6, HK 10.8, HK 16.9
Bradamante, Franco ......... HK 17.2
Braun, Jens ........HK 20.2, HK 20.3
Braun, Vladimir ............. HK 11.1
Braun-Munzinger, P. ... HK 12.43,
HK 45.7
Breitschopf, J. ..............HK 11.23
Breitschopf, Johannes .......HK 11.24
Brendel, Lutz ...............HK 12.22
Bringel, P. HK 8.3, HK 10.6, HK 10.7,
HK 10.8, HK 16.9
Brinkmann, K.-T. ............HK 27.3
Bröcker, Johannes .HK 12.33, HK 45.4
Broeckhove, Jan .............HK 6.10
Brömmel, Dirk .............. HK 26.4
Bruechle, Willy .............. HK 14.1
Brück, Kim ................ HK 12.28
Brunken, Marco ............. HK 25.2
Bruyneel, B. ..... HK 10.21, HK 12.13
Brys, T. .....................HK 42.5
Bry´s, T. .....................HK 42.2
Buballa, Michael .............HK 26.3
Buck, Christian .... HK 15.6, HK 42.1
Bürger, A. .... HK 10.6, HK 10.7,
HK 10.8, HK 12.13, HK 16.9
Buervenich, T. ................HK 2.2
Büscher, M. ........HK 31.1, HK 45.3
Büsching, Henner ...........HK 14.13
Büttiker, Paul ............... HK 32.6
Bukharov, A. ................ HK 45.3
Bulgac, Aurel .................HK 6.4
Buncic, P. ... HK 14.11, HK 14.12,
HK 21.1, HK 21.5, HK 21.6,
HK 21.7, HK 21.8, HK 21.9
Burda, O. ..........HK 10.9, HK 12.1
Busch, Oliver ................HK 14.9
Buss, Oliver .................. HK 5.7
Byelikov, A. ................. HK 42.3
Byrne, Jim .......HK 12.19, HK 12.27
Calen, H. ....................HK 31.1
Camera, F. .........HK 10.5, HK 10.6
Capozza, Luigi ............. HK 11.36
Caprio, M. ................. HK 10.13
Carli, W. .................... HK 12.4
Carli, Walter ............... HK 12.33
Carlsson, G. ................. HK 10.3
Carroll, J. J. .................HK 34.3
Carter, J. ....................HK 19.1
Casarejos, E. ............... HK 10.26
Cassing, Wolfgang HK 20.10, HK 24.1
Castelijns, R. ....HK 3.3, HK 3.4,
HK 11.33
castelijns, ralph ..............HK 30.2
Casten, R. F. ..... HK 10.13, HK 42.7
CB-ELSA - Collaboration .....HK 30.6
CB/TAPS@ELSA - Collaboration
HK 44.3, HK 44.4
CBELSA - Collaboration .. HK 4.11,
HK 12.20
CBELSA-TAPS - Collaboration
HK 11.29
CBELSA/TAPS - Collaboration
HK 11.25, HK 11.28, HK 27.4,
HK 30.2, HK 30.7
CBM - Collaboration ........HK 21.11
Cejnar, P. ................... HK 23.5
CELSIUS-WASA - Collaboration
HK 27.6, HK 38.4
CERES - Collaboration ...HK 14.7,
HK 14.8, HK 21.2, HK 21.3,
HK 35.1
CHAOS - Collaboration ..... HK 11.24
Chen, Dong ................ HK 12.33
Chen, Jia-Er .................HK 25.6
Cherepnya, S. .............. HK 17.10
Chernetsky, V. ...............HK 45.3
Chernyshev, V. .............. HK 45.3
Chiladze, D. ................HK 11.19
Chizhov, V. ................ HK 11.34
Chkvorets, Oleg .... HK 15.5, HK 48.4
Chmel, S. ................... HK 29.5
Christ, T. ................... HK 18.1
Christen, S. ...HK 10.4, HK 10.23,
HK 35.3
Chumakov, M. ...............HK 45.3
Chyzh, A. ................... HK 29.4
Clement, E. ................. HK 10.6
Clement, H. .. HK 11.22, HK 11.23,
HK 27.5, HK 27.6, HK 32.5,
HK 38.4
Clement, Heinz .............HK 11.24
Coeck, S. ................... HK 43.6
Colonna, M. .................HK 41.4
COMPASS - Collaboration HK 11.37,
HK 11.38, HK 12.34, HK 17.2,
HK 17.4, HK 17.6, HK 17.8,
HK 17.9, HK 18.8, HK 22.3,
HK 39.3
COMPASS (NA58) - Collaboration
HK 17.5
Cooper, J. R. ................HK 23.1
cordier, everard ..............HK 31.3
Corthals, Tamara ............ HK 24.3
COSY-11 - Collaboration . HK 11.12,
HK 11.13, HK 11.14, HK 11.15,
HK 30.4, HK 38.3
COSY-TOF - Collaboration HK 11.22,
HK 27.3, HK 27.5, HK 31.4,
HK 44.2
COSY-TOF collaboration - Collaboration
HK 11.21
Cröni, M. .................. HK 11.23
Crompton, Peter .............HK 26.4
Crystal Barrel at ELSA - Collaboration
HK 13.14
Crystal Barrel collaboration at ELSA -
Collaboration .......... HK 10.22
Csatlós, M. ..................HK 16.2
Curien, D. HK 10.7, HK 10.8, HK 16.9
Czekaj, S. ..................HK 12.18
Dababneh, S. ...............HK 48.10
Damjanović, Sanja ...........HK 21.4
Dammalapati, U. ............ HK 12.5
Daues, H. W. ..... HK 12.43, HK 45.7
Daugas, Jean-Michel .........HK 16.3
Daum, M. ....HK 12.18, HK 42.2,
HK 42.5
Davids, B. ......... HK 43.2, HK 43.7
de Angelis, G. .. HK 10.1, HK 10.5,
HK 10.18, HK 10.24, HK 29.5
de France, Gilles .............HK 16.3
de Frenne, D. ... HK 3.8, HK 37.4,
HK 43.2, HK 43.3, HK 43.7
De Frenne, Denis ............ HK 43.4
de Huu, M. A. ..............HK 11.33
de Jong, S. .................HK 10.12
De Maesschalck, Anneleen ... HK 16.5
de Masi, R. ................ HK 11.38
de Masi, Rita ................HK 31.6
de Meijer, Rob .............. HK 28.4
De Oliveira Santos, Francois ..HK 16.3
de Witte, Hilde .............. HK 37.3
DEAR - Collaboration ........HK 37.1
Dedek, Nicolas .............. HK 17.8
Deepak, P. N. .............. HK 11.11
Index of Authors
Delahaye, P. .................HK 43.6
Delauré, B. ..................HK 43.6
Demey, Michiel .............. HK 39.4
Dendooven, P. .... HK 10.12, HK 12.5
Denz, H. ...................HK 11.23
Denz, Holger ............... HK 11.24
Dermois, 0. ...................HK 4.8
Dermois, O. ................. HK 12.5
Descotes-Genon, Sebastien ... HK 32.6
Destefanis, Marco ........... HK 18.2
Devlin, M. ...................HK 29.7
Dewald, A. ....HK 10.5, HK 29.1,
HK 29.3, HK 29.5
Di Leva, Antonino ........... HK 48.6
Di Toro, M. ................. HK 41.4
Dickel, T. .................... HK 4.3
Diefenbach, Jürgen .......... HK 39.8
Dietrich, Dennis .............. HK 6.3
Dietrich, Juergen ............ HK 25.1
Dietz, Alexander .............HK 48.4
Dilger, S. ....................HK 33.7
Dinkelaker, P. . HK 14.11, HK 14.12,
HK 21.1, HK 21.5, HK 21.6,
HK 21.7, HK 21.8, HK 21.9
Djeridi, Roukaia ....HK 18.2, HK 18.3
Dodonov, A. F. ............... HK 4.3
Dönau, F. HK 10.1, HK 19.9, HK 43.1
Dörr, Wolfgang ..............HK 4.10
Dohrmann, Frank ............HK 30.3
Doornenbal, P. .............. HK 10.6
Doroshkevich, E. HK 11.22, HK 27.5,
HK 27.6, HK 32.5, HK 38.4
Dreyer, Ute ..................HK 7.10
Dschemuchadse, S. .......... HK 27.3
Dubbers, Dirk ............... HK 48.9
Duchêne, G. .................HK 29.5
Dudeck, S. ................. HK 18.10
Düren, Michael .............. HK 31.5
Düweke, C. D. ..... HK 37.5, HK 37.6
Düweke, Carsten .............HK 34.9
Dumitru, Adrian ....HK 14.2, HK 26.7
Dymov, S. ................. HK 11.19
Ebberink, G. .................HK 12.5
Eberth, J. .... HK 10.1, HK 10.3,
HK 19.10, HK 29.7, HK 43.8
EDDA - Collaboration ........HK 30.1
Efimov, G. ................. HK 10.19
Egelhof, Peter ............... HK 50.4
Egger, J.-P. .................. HK 3.1
Eichelhardt, Frank ........... HK 15.1
Eisermann, Y. ..HK 10.4, HK 10.23,
HK 35.3
Eitel, Klaus ..................HK 48.1
Ekström, C. ................. HK 31.1
Eliseev, S. .................... HK 4.4
Eliseev, S. A. ................. HK 4.3
Eliseev, Sergey ............. HK 12.11
Ellinghaus, F. ................HK 44.8
Elschenbroich, Ulrike .........HK 17.3
Elster, Charlotte ............. HK 11.6
Emhofer, Stephan .......... HK 12.10
Emling, H. .................. HK 12.7
Emmerich, R. .............. HK 12.12
Emmerich, Reinhard ......... HK 45.2
Emschermann, David ........ HK 45.9
Enders, J. ....HK 10.9, HK 10.15,
HK 12.1, HK 19.6
Enders, Joachim .............HK 25.2
Engelhardt, Michael ..........HK 40.2
Engels, Ralf ................. HK 45.2
Enghardt, Wolfgang ......... HK 4.10
Enqvist, T. ... HK 10.26, HK 33.6,
HK 41.6
Enqvist, Timo ............... HK 12.6
Epelbaum, Evgeny ............ HK 5.1
Erhard, M. .........HK 19.9, HK 43.1
Erhardt, A. ....... HK 11.22, HK 27.5
Ermisch, K. .................. HK 3.3
ERNA - Collaboration ........HK 48.6
Essig, Kathrin ............... HK 15.2
EUROBALL - Collaboration . HK 8.3,
HK 10.8, HK 16.9
EUROSUPERNOVA - Collaboration
HK 3.8, HK 3.9
Eversheim, Dieter ...........HK 11.37
EXEL / NUSTAR - Collaboration
HK 2.7
Eyrich, Wolfgang HK 11.37, HK 17.2,
HK 44.2
Facina, Marius ................HK 4.5
Faessler, Amand ..HK 5.3, HK 24.6,
HK 32.2, HK 40.5, HK 47.1
Faestermann, T. .. HK 2.2, HK 2.4,
HK 2.6, HK 10.21, HK 16.2
Faestermann, Thomas ...... HK 12.14
Falch, M. .....................HK 2.2
Fallon, P. .......... HK 10.8, HK 16.9
Falter, Thomas .............. HK 24.1
Fang, Jia-Xun ............... HK 25.6
Farnea, E. ....HK 10.1, HK 10.18,
HK 29.1, HK 29.5
Farouqi, Khalil ...............HK 28.3

Fassò, A. ...................HK 12.39
Faust, H. ...................HK 16.10
Fearick, R. W. ..... HK 19.1, HK 42.3
Fedorets, P. ................. HK 45.3
Fedosseev, Valentine ......... HK 37.3
Feldmeier, Hans ...... HK 6.8, HK 9.1
Feltresi, Enrico .............. HK 18.9
Fernandez, B. .............. HK 10.26
Fierlinger, P. .. HK 12.18, HK 42.2,
HK 42.5
Fierlinger, Peter ............ HK 12.15
Fil’kov, L. ..................HK 17.10
Filipescu, D. .................HK 37.7
Finelli, Paolo ................ HK 5.10
Fischer, H. ....HK 17.4, HK 17.6,
HK 17.9, HK 18.8
Fischer, Horst ............... HK 17.2
Fitzler, A. HK 10.5, HK 29.1, HK 29.7
Flatt, Björn ................. HK 15.3
Flierl, D. ....HK 14.11, HK 14.12,
HK 21.1, HK 21.5, HK 21.6,
HK 21.7, HK 21.8, HK 21.9
Fodor, Zoltan ............... HK 35.4
Förtsch, S. V. ............... HK 19.1
Foka, P. ....................HK 12.39
FOPI - Collaboration HK 41.2, HK 41.3
FOPI collaboration, supported by BMBF
(06HD154) and GSI (HD-HER). -
Collaboration ........... HK 31.3
Formicola, Alba ..............HK 34.8
Franchoo, Serge ............. HK 37.3
Franczak, B. ......... HK 2.4, HK 2.6
Frank, A. ....................HK 35.3
Frankenfeld, U. .............. HK 45.7
Frankenfeld, Ulrich ......... HK 12.43
Frankfurt, L. ..................HK 7.8
Fransen, C. ....HK 16.7, HK 16.8,
HK 19.4, HK 19.10, HK 29.2,
HK 29.4, HK 34.2, HK 34.3
Fransen, Ch. .................HK 29.3
Fransen, Christoph ............HK 1.1
Franz, J. . HK 17.4, HK 17.6, HK 17.9
Franzke, B. ...........HK 2.2, HK 2.4
Frauendorf, S. ............... HK 10.5
Frederico, T. .. HK 13.13, HK 20.5,
HK 46.1
Frei, Andreas ..... HK 12.16, HK 45.4
Freiesleben, H. .............. HK 27.3
Frekers, D. HK 3.8, HK 37.4, HK 43.2,
HK 43.7
Frekers, Dieter ...............HK 22.1
Friedman, E. ............... HK 11.23
Friedrich, J. ................ HK 11.38
Friedrich, Jan ................HK 31.6
Friese, V. ... HK 14.11, HK 14.12,
HK 21.1, HK 21.5, HK 21.6,
HK 21.7, HK 21.8, HK 21.9
Friessner, G. ... HK 19.4, HK 34.2,
HK 34.3
Friman , Bengt ............... HK 6.1
Frink, Matthias ..............HK 5.11
Fritsch, Stefan ...............HK 13.3
Fröhlich, Ingo ...... HK 18.2, HK 18.3
Frömel, Frank .............. HK 13.11
FRS-Ion-Catcher - Collaboration
HK 4.3
Fuchs, A.-M. ............... HK 11.38
Fuchs, Anna-Maria ...........HK 31.6
Fuchs, Chr. ........ HK 41.4, HK 47.7
Fuchs, Christian ............. HK 47.1
Fuchs, Thomas .............. HK 32.3
Fülöp, Zs. ...................HK 34.5
Fuhrmann, H. ................ HK 3.1
Fujita, H. .....................HK 3.9
Fujita, Y. ........... HK 3.9, HK 19.1
Funke, Christian ............. HK 4.11
Gadea, A. HK 10.1, HK 10.5, HK 29.5
Gagarski, Alexei ............. HK 33.8
Gail, Tobias ................. HK 13.8
Gaitanos, Th. ...... HK 41.4, HK 47.7
Galaviz, D. ... HK 10.11, HK 19.5,
HK 19.7, HK 19.8, HK 34.1,
HK 34.4, HK 34.5, HK 42.7
Gallmeister, Kai ...HK 20.10, HK 24.1
Gangopadhyay, G. ........... HK 10.7
Garabatos, C. ..... HK 12.43, HK 45.7
Garabatos, Chilo ............HK 12.38
Garrett, P. E. ................HK 29.3
Gasparyan, Achot ............HK 11.8
Gasparyan, Achot M. ....... HK 11.10
Gasser, J. .................... HK 5.8
Gast, W. ..........HK 10.24, HK 29.5
Gattringer, Christof HK 26.4, HK 26.5,
HK 49.4
Gazdzicki, M. . HK 14.11, HK 14.12,
HK 21.1, HK 21.5, HK 21.6,
HK 21.7, HK 21.8, HK 21.9,
HK 21.10
Ga´zdzicki, Marek ............. HK 7.6
Gaˇsparic, I. ................... HK 3.3
GDH - Collaboration .........HK 27.1
Gebauer, G. ................ HK 10.19
Gebel, R. ...................HK 11.19
Gebel, Ralf .................. HK 25.1
Gegelia, Jambul ............. HK 32.3
Geissel, H. . HK 2.2, HK 2.4, HK 2.6,
HK 4.3, HK 12.7, HK 12.11
Geltenbort, P. ......HK 42.2, HK 42.5
GEM Collaboration - Collaboration
HK 11.20, HK 27.7
Genevey, J. .................HK 16.10
Genz, H. .................... HK 12.2
George, D. ................. HK 12.18
Georgiev, Georgi ............. HK 16.3
Geppert, Christopher ........HK 12.28
Gerasimov, A. ............... HK 45.3
Gerassimov, S. ............. HK 11.38
Gerber, J. HK 19.3, HK 23.2, HK 23.3
Gerl, J. ......................HK 10.6
Gernhäuser, R. ...HK 10.21, HK 18.10
Gersch, G. ......... HK 10.3, HK 43.8
GHEYSEN, S. ............... HK 16.4
Giacosa, Francesco ............HK 5.3
Gibson, E. ..................HK 11.23
Giersch, M. ..................HK 42.2
Gillitzer, A. ..................HK 31.1
Girlanda, Luca ................HK 5.5
Giusti, Carlotta ............... HK 3.6
Gläser, Boris ............... HK 12.31
Glässel, P. ........ HK 12.43, HK 45.7
Glaessner, Christian ....HK 12.25,
HK 12.26
Gläßner, Christian .......... HK 12.24
Glagolev, V. ................HK 11.19
Glander, Karl-Heinz ..........HK 38.1
Glöckle, Walter ............... HK 5.1
Glozman, Leonid .............HK 32.1
Glozman, Leonid Ya. .........HK 26.4
Glück, Ferenc ....HK 12.19, HK 12.27
Goeke, Klaus .......HK 13.2, HK 40.7
Gönnenwein, F. ..............HK 33.7
Goennenwein, Friedrich ...... HK 33.8
Görgen, A. .................. HK 10.6
Görres, J. ................... HK 34.7
Goertz, Stefan ...............HK 45.1
Goldenbaum (for the PISA
collaboration), Frank .... HK 48.8
Golovko, V. V. .............. HK 43.6
Golubeva, M. ................HK 18.1
Gopych, Mykhaylo ........... HK 25.2
Gorbachenko, O. .............HK 29.2
Gorska, M. ................... HK 4.1
Goryachev, V. ............... HK 45.3
Gotta, D. .....................HK 3.1
Grabmayr, P. ........HK 3.7, HK 46.6
Gräf, Hans-Dieter ............HK 25.2
Graw, G. HK 10.4, HK 10.23, HK 16.2,
HK 35.3
Graw, Gerhard ..............HK 10.17
Grawe, H. ................... HK 10.6
Grebenyuk, Oleksandr ...... HK 14.10
Grebosz, J. ..................HK 10.6
Greiner, Carsten .....HK 8.2, HK 14.6
Greiner*, Carsten HK 13.12, HK 20.10,
HK 47.8
Grewe, E.-W. ...HK 37.4, HK 43.2,
HK 43.7
Griesshammer, Harald W. ..... HK 6.9
Grießhammer, Harald W. .....HK 24.5
Grigorian, Hovik ............. HK 28.7
Grigoriev, Kyrill ..............HK 45.2
Grosse, E. ..........HK 19.9, HK 43.1
group, ESR ................ HK 10.20
group, FRS .................HK 10.20
Grube, B. .................. HK 11.38
Gruber, A. ....................HK 3.1
Grüter, Burghard ............ HK 40.1
Grzonka, D. ........HK 31.1, HK 37.2
Gschrey, Andreas ..HK 12.16, HK 45.4
GSI-ISOL - Collaboration . HK 10.10,
HK 43.5
Guenaut, C. ................. HK 43.6
Günther, C. ................. HK 43.8
Guhr, T. .................... HK 19.6
Gulyás, J. ................... HK 16.2
Guo, Zhi-Yu .................HK 25.6
Gupta, M. ...................HK 42.5
Gusev, L. ....................HK 45.3
Gutsche, Th. ................ HK 24.6
Gutsche, Thomas ....HK 5.3, HK 32.2
Gutsmiedl, Erwin ..HK 12.16, HK 45.4
Gutz, Eric ..................HK 11.29
Guzey, Vadim ...... HK 24.7, HK 44.6
Gyürky, Gy. ..................HK 34.5
Górska, M. .................. HK 10.6
Habs, D. ..HK 2.9, HK 4.3, HK 4.4,
HK 10.21, HK 12.11, HK 12.13,
HK 16.2, HK 25.3
Habs, Dieter ............... HK 12.17
Habs, Dietrich ..............HK 12.10
HADES - Collaboration ...HK 12.8,
HK 12.9, HK 14.5, HK 18.1,
HK 18.2, HK 18.3, HK 18.4,
HK 35.2
Haefner, P. HK 3.8, HK 37.4, HK 43.2,
HK 43.7
Hagemann, G. B. .HK 10.7, HK 10.8,
HK 16.9
Haidenbauer, Johann ....HK 11.5,
HK 11.7, HK 11.8, HK 11.9,
HK 11.10, HK 44.5
Haight, R. C. ................HK 34.7
Hambsch, F.-J. .............. HK 37.7
Hammel, Thorsten ..........HK 12.30
Hammond, G. ................ HK 2.8
Hanhart, C. .......HK 11.11, HK 31.1
Hanhart, Christoph HK 1.3, HK 11.5,
HK 11.7, HK 11.8, HK 11.9,
HK 11.10
Hansen, C. R. ......HK 10.8, HK 16.9
Harakeh, M. ...... HK 10.12, HK 12.5
Harakeh, M. N. ...HK 3.3, HK 3.4,
HK 16.2, HK 37.4, HK 43.2,
HK 43.7
Harbach, Ulrich ..............HK 40.4
Hart, A. G. ..................HK 26.6
Hartig, Matthias .............HK 31.5
Hartmann, F. Joachim .. HK 12.16,
HK 12.33, HK 45.4
Hartmann, F. X. ... HK 15.6, HK 42.6
Hartmann, Francis Xavier .... HK 42.1
Hartmann, Joachim ....HK 12.19,
HK 12.27
Hartmann, Olaf ..............HK 41.2
Hartmann, T. ..HK 10.13, HK 19.5,
HK 19.7, HK 19.8, HK 34.1
Hartmann, Timo .............HK 25.2
Hasch, Delia .................HK 49.3
Hasper, J. ..................HK 10.13
Haupt, Christian ..............HK 6.6
Hausmann, M. ....... HK 2.2, HK 2.4
Hautle, P. ................... HK 42.2
Hebeler, Kai ..................HK 6.1
Hecht, A. .................. HK 10.13
Heckmann, Jörg ............. HK 45.1
Hedicke, S. ........ HK 17.6, HK 17.9
Hedicke, Sonja .............. HK 17.4
Hegelich, M. ................ HK 16.2
Hegewisch, S. ................ HK 2.9
Hehl, T. ......................HK 3.7
Hehner, J. ........ HK 12.43, HK 45.7
Heil, M. .....................HK 34.7
Heil, Michael ...............HK 48.10
Heil, Werner ..HK 12.19, HK 12.27,
HK 48.7
Heim, J. ......................HK 3.7
Heine, A. ....................HK 19.6
Heinsius, F. H. .. HK 17.4, HK 17.6,
HK 17.9
Heinsius, F.-H. .............. HK 18.8
Heinz, S. ..HK 2.9, HK 4.3, HK 4.4,
HK 12.11
Heinze, S. ...................HK 23.5
Hejny, V. ......... HK 11.19, HK 31.1
Hellström, M. ............... HK 10.6
Hellstrvm, M. .................HK 2.4
Hemmert, T. R. ..... HK 5.6, HK 26.2
Hemmert, Thomas ...........HK 26.1
Hemmert, Thomas R. ... HK 13.8,
HK 24.5
Hencken, Kai ................HK 7.10
Hennebach, M. ............... HK 3.1
Henneck, R. ........HK 42.2, HK 42.5
Henneck, Reinhold ..........HK 12.15
Henzl, V. ....................HK 41.6
Henzl, Vladimir .............HK 10.26
Henzlova, D. .......HK 33.6, HK 41.6
Hergert, Heiko ................HK 9.1
HERMES - Collaboration . HK 12.35,
HK 17.3, HK 17.7, HK 31.5,
HK 39.2, HK 39.4, HK 44.1,
HK 44.8, HK 49.3
Herskind, B. ... HK 10.7, HK 10.8,
HK 16.9
Hertenbeger, Ralf ...........HK 10.17
Hertenberger, R. .HK 10.4, HK 10.23,
HK 12.13, HK 16.2, HK 35.3
Hertling, Michael ............ HK 25.2
Hess, H. .....................HK 43.8
Heusler, Andreas ........... HK 10.17
Heusser, G. ..................HK 42.6
Heyde, K. ................... HK 28.5
Heyde, Kris ................. HK 16.5
Heßler, Christoph ............ HK 25.2
Hicks, S. F. ................. HK 29.3
Hierl, Dieter .................HK 26.5
Hildebrandt, Robert P. ....... HK 24.5
Hiles, K. .................... HK 23.1
Hillenbrand, Achim .......... HK 17.7
HIMPE, P. .................. HK 16.4
Himpe, Pieter ............... HK 16.3
Hino, M. .................... HK 42.2
Hirtl, A. ......................HK 3.1
Hochman, Z. ...............HK 12.18
Hodde, H. ...................HK 19.3
Hoehne, C. ....... HK 21.5, HK 21.10
Index of Authors
Höistad, B. ..................HK 31.1
Hoek, Matthias ..............HK 31.5
Hoekstra, R. .................HK 12.5
Hörandel, Jörg R. ............HK 28.2
Hoffmeister, Philipp ........ HK 12.20
Hofmann, Benjamin ........ HK 12.22
Hofmann, F. ..................HK 3.9
Hofmann, Stefan ............ HK 40.4
Hohn, D. .......... HK 19.3, HK 23.2
Hollmann, N. ...HK 19.4, HK 34.2,
HK 34.3
Holzapfel, N. ............... HK 12.13
Holzmann, R. ............... HK 18.1
Holzmann, Romain ......... HK 21.11
Hong, Deog Ki .............. HK 28.7
Horgan, R. R. ............... HK 26.6
Horta, Raquel Muñoz .......HK 12.19
Hossenfelder, Sabine ......... HK 40.4
Huber, Gerhard ..............HK 37.3
Hübel, H. HK 8.3, HK 10.6, HK 10.7,
HK 10.8, HK 12.13, HK 16.9
Huisman, L. .........HK 4.7, HK 12.5
Hunyadi, M. ...HK 11.33, HK 16.2,
HK 37.4, HK 43.2, HK 43.7
Iatsioura, V. ................HK 11.34
Ignatyuk, Anatoly V. .........HK 29.6
Imai, Yoshio ................HK 12.32
Imig, A. ........... HK 37.5, HK 37.6
Imig, Astrid ................. HK 34.9
Indelicato, P. ................. HK 3.1
Ionescu, R.-A. ............... HK 47.7
Isocrate, R. ................ HK 18.10
ISOLTRAP - Collaboration .... HK 2.3
Ivanov, Igor P. ...............HK 47.2
Ivanov, M. A. .................HK 5.8
Ivanova, S. P. ............... HK 33.4
Ivassivka, Bogdan .......... HK 13.16
Jachowicz, N. ............... HK 28.5
Jacobs, E. HK 3.8, HK 37.4, HK 43.2,
HK 43.7
Jaeger, Egon ................ HK 14.1
Jäger, H. M. ......HK 10.24, HK 29.5
Jaeglé, Igal .................HK 11.28
Jäkel, R. .................... HK 27.3
Janssen, Stijn ............... HK 24.3
Janusz, M. ................. HK 11.12
Jaskula, M. ..................HK 18.1
Jefferson Lab E93-049 - Collaboration
HK 1.2
Jendges, Lars ................HK 20.3
Jensen, D. R. ................HK 10.7
Jesinger, P. ................ HK 11.23
Jesinger, Peter ...............HK 33.8
Jessen, K. ..........HK 10.5, HK 29.1
JESSICA - Collaboration ...... HK 4.9
Johanson, H. ................. HK 3.8
Johansson, H. ......HK 37.4, HK 43.2
Jolie, J. HK 10.4, HK 10.23, HK 16.8,
HK 16.10, HK 19.4, HK 23.3,
HK 23.5, HK 29.1, HK 29.3,
HK 34.2, HK 34.3, HK 35.3
Jolie, Jan ........... HK 4.6, HK 25.4
Jonson, B. ....................HK 3.8
Joosten, Rainer ... HK 11.37, HK 17.2
Joss, D. T. ..................HK 10.7
Jungclaus, A. ................HK 10.1
Junghans, A. R. ....HK 19.9, HK 43.1
Jungmann, K. ... HK 4.7, HK 4.8,
HK 12.5
Jungmann, Klaus ............ HK 28.4
Junk, B. ........... HK 37.4, HK 43.7
Kacharava, A. .............. HK 11.19
Kämpfer, Burkhard .......... HK 20.9
Käppeler, F. ... HK 34.2, HK 34.3,
HK 34.7, HK 48.10
Käubler, L. ..................HK 34.2
Kaiser, Norbert .. HK 5.4, HK 5.10,
HK 13.3, HK 13.4, HK 13.5
Kalantar-Nayestanaki, N. .. HK 3.3,
HK 3.4, HK 11.33
Kalashnikova, Yulia .......... HK 11.7
Kalmykov, Y. HK 3.8, HK 3.9, HK 19.1
Kamanin, D. ............... HK 10.19
Kamerdhziev, S. ............. HK 19.8
Kang, D. .......... HK 17.4, HK 17.9
Kang, Donghee ..............HK 17.6
Kaos - Collaboration HK 30.3, HK 41.1
Karg, O. ..........HK 10.15, HK 34.3
Karnaukhov, Anton .......... HK 25.2
Karsch, L. ...................HK 27.3
KASCADE - Collaboration ... HK 28.2
Kashevarow, V. .............HK 17.10
Kaskulov, M. ...HK 27.6, HK 32.5,
HK 38.4
Kaskulov, M. M. .............HK 46.6
Kasprzak, M. ..... HK 12.18, HK 42.2
KATRIN - Collaboration .. HK 15.1,
HK 15.2, HK 15.3, HK 48.1,
HK 48.2, HK 48.3
Kavatsyuk, M. ...............HK 43.5
Kavatsyuk, Oksana ......... HK 10.10
Kaza, E. ..... HK 2.2, HK 2.4, HK 2.6

Keil, Christoph ............... HK 6.7
Keillor, M. .................. HK 42.6
Kelic, A. HK 10.26, HK 33.6, HK 41.6
Kelic, Aleksandra ............ HK 29.6
Kelley, J. H. ................HK 10.14
Kenn, O. . HK 19.3, HK 23.2, HK 23.3
Keri, Tibor .................. HK 31.5
Kerscher, T. ..................HK 2.2
Kessler, Thomas ............HK 12.28
Kester, O. ......... HK 12.4, HK 25.3
Kester, Oliver ....HK 12.10, HK 12.17
Ketzer, B. ..................HK 11.38
Khodyachykh, Sergiy .........HK 25.2
Khoukaz, Alfons ............. HK 30.8
Kienle, P. .................... HK 2.6
Kiewiet, H. H. ...............HK 12.5
Kiewiet, K. ................... HK 4.8
Kilian, K. .......... HK 25.5, HK 31.1
Kilian, Kurt ................. HK 31.4
Kilian, Schwarz .............HK 12.36
Kilian, Wolfgang .............HK 48.7
Kirch, K. ......... HK 12.18, HK 42.5
Kirch, Klaus ...... HK 12.15, HK 42.2
Kirschner, Daniel ............ HK 18.2
Kirste, Vinzenz .............. HK 48.7
Kiss, G. ..................... HK 34.5
Kivel, Nikolai ................HK 13.1
Kiˇs, M. ....HK 3.3, HK 3.4, HK 11.33
Klapdor-Kleingrothaus, Hans Volker
HK 15.5, HK 48.4
Kleber, V. ..................HK 11.18
Klein, Bertram .............. HK 20.3
Klein, Spencer ...............HK 7.10
Klein-Bösing, Ch. ............. HK 7.4
Klepper, O. .. HK 2.2, HK 2.4, HK 2.6
Kliemant, M. ..HK 14.11, HK 14.12,
HK 21.1, HK 21.5, HK 21.6,
HK 21.7, HK 21.8, HK 21.9
Kliemant, Michael ............ HK 7.6
Klink, William H. ............. HK 6.2
KLOE - Collaboration .........HK 3.2
Kloker, Markus .............. HK 46.8
Kluge, H.-J. HK 2.2, HK 2.4, HK 4.4,
HK 12.28
Kmiecik, M. .................HK 10.6
Kneissl, U. ....HK 16.7, HK 19.4,
HK 29.4, HK 34.2, HK 34.3
Kniege, S. ... HK 14.11, HK 14.12,
HK 21.1, HK 21.5, HK 21.6,
HK 21.7, HK 21.8, HK 21.9
Knoll, Jörn .................. HK 20.1
Köck, Frank ................HK 12.37
Koenig, Wolfgang ........... HK 18.3
Königsmann, K. . HK 17.4, HK 17.6,
HK 17.9
Kohlbrecher, J. .............. HK 42.2
Kohlik, K. ..................HK 12.18
Kohstall, C. ... HK 16.7, HK 19.4,
HK 29.4, HK 34.2, HK 34.3
Kojouharov, I. ............... HK 10.6
Kokalova, Tz. ....HK 10.18, HK 10.19
Kolb, B. .....................HK 12.9
Kolb, Peter ...................HK 7.7
Kolbe, Edwin ................HK 42.4
Komarov, V. ............... HK 11.19
Konorov, I. .................HK 11.38
Konorov, Igor . HK 12.19, HK 12.27,
HK 31.6
Konrad, Patrick ............. HK 46.7
Konter, J. A. ................ HK 42.2
Korchin, Alexander ......... HK 13.15
Korff, A. . HK 37.4, HK 43.2, HK 43.7
Korzenev, Alexander ......... HK 17.5
Kosev, K. ..........HK 19.9, HK 43.1
Kostov, L. ...................HK 34.2
KOWALSKA, M. ............ HK 16.4
Kowalska, Magda ............HK 16.3
Kozhuharov, C. ...HK 2.2, HK 2.4,
HK 2.6
Kozlov, V. Yu. ...............HK 43.6
Kozlov, Vlademir ............ HK 31.4
Kraev, I. S. ..................HK 43.6
Krambrich, D. ..............HK 11.35
Krassnigg, Andreas ........... HK 6.2
Krasznahorkay, A. ........... HK 16.2
Kratz, K.-L. ..........HK 2.2, HK 2.4
Kratz, Karl-Ludwig .......... HK 28.3
Kraus, I. ....HK 14.11, HK 14.12,
HK 21.1, HK 21.5, HK 21.6,
HK 21.7, HK 21.8, HK 21.9,
HK 21.10
Krauss, B. ...................HK 44.8
Krebs, Hermann ............HK 13.10
Krein, Gastão ............... HK 44.5
Kress, J. ..........HK 11.22, HK 27.5
Kretschmer, A. . HK 10.11, HK 19.5,
HK 19.7, HK 19.8, HK 34.1,
HK 34.4, HK 34.5
Krewald, S. ..................HK 31.1
Krewald, Siegfried HK 11.2, HK 11.3,
HK 11.6, HK 32.4, HK 38.2,
HK 38.5
Krimmer, Jochen ............ HK 27.1
Krivoruchenko, Mikhail .......HK 47.1
Krivosheina, Irina ...HK 15.5, HK 48.4
Kröll, T. ................... HK 10.21
Kröll, Th. .........HK 10.7, HK 18.10
Krücken, R. ......HK 10.21, HK 18.10
Krücken, Reiner ............ HK 12.14
Kudryavtsev, Alexander ...... HK 11.7
Kudějová, Petra ..... HK 4.6, HK 25.4
Kühn, Wolfgang ....HK 18.2, HK 18.3
Kuehne, G. ....... HK 12.18, HK 42.2
Kühnel, Kai Uwe .HK 12.25, HK 12.26
Kuehnel, Kai-Uwe .....HK 12.22,
HK 12.23, HK 12.24, HK 25.7
Kuhlmann, Eberhard ........HK 11.21
Kuhn, R. ......... HK 11.38, HK 18.8
Kuhn, Roland .............. HK 12.34
Kulikov, A. .................HK 11.19
Kullander, S. ................ HK 31.1
Kumbartzki, G. .............. HK 23.1
Kunz, Peter ................. HK 37.3
Kunze, Marco ............... HK 25.2
Kurz, N. .................... HK 10.6
Kusnezov, D. ................HK 42.7
Kusterer, Daniel-Jens ........ HK 40.3
Kuzniak, M. ................HK 12.18
Ku´zniak, M. .................HK 42.2
Lacker, Heiko ................HK 18.9
Lacroix, D. .................. HK 19.1
Laier, Ulrich .................HK 25.2
Laine, Mikko ................. HK 8.1
Lang, C. B. ................. HK 26.4
Lang, N. ................... HK 11.19
Lang, Norbert ............... HK 30.8
Langanke, K. ................ HK 42.3
Langfeld, Kurt ...............HK 40.3
Larionov, Alexei ............. HK 47.5
Lasserre, Thierry .............HK 42.1
Laubenstein, M. ............. HK 42.6
Lauer, M. .................. HK 10.21
Lauer, Martin .............. HK 12.37
Lava, Pascal .................HK 24.2
Lawall, Ralf ................ HK 11.27
Lawrie, J. J. .................HK 19.1
Lazarus, Ian ................ HK 12.37
Le Fèvre, Arnaud ............ HK 33.1
Lechner, Marcus .............. HK 6.2
Lee, Jeong Han ..............HK 31.8
Leeb, Helmut ...............HK 12.44
Lehnert, Jörg ...... HK 18.2, HK 18.3
Lehrach, A. ................. HK 25.5
Lehrach, Andreas ............ HK 25.1
Lemmer, Richard ............ HK 32.4
Lenhardt, A. ....... HK 10.9, HK 12.1
Lenhardt, Alexander ......... HK 25.2
LENS - Collaboration ........ HK 42.1
Lenske, H. ...................HK 37.8
Lenske, Horst ... HK 6.7, HK 19.2,
HK 46.7
Lenz, Alexander ............. HK 11.1
Lenzi, S. M. ..... HK 10.18, HK 10.19
Leontyev, V. ............... HK 18.11
Leske, J. . HK 19.3, HK 23.2, HK 23.3
Lessmann, Elisabeth ......... HK 4.10
Leupold, Stefan HK 13.11, HK 13.12,
HK 20.7, HK 24.4
Lewandowski, Bernd ... HK 11.30,
HK 11.32
Ley, J. ............. HK 37.5, HK 37.6
Ley, Jürgen ........ HK 34.9, HK 45.2
Li, J. ...................... HK 10.14
Lieb, K. P. .................. HK 10.1
Lieder, E. O. ............... HK 10.24
Lieder, R. M. ..HK 10.24, HK 10.25,
HK 29.5
LIEVENS, P. ................ HK 16.4
Lindenberg, K. . HK 10.12, HK 12.3,
HK 19.5, HK 19.7, HK 19.8
Lindroth, A. .................HK 43.6
Linnemann, A. .. HK 16.7, HK 16.8,
HK 19.4, HK 29.3, HK 29.4,
HK 34.2, HK 34.3
Linnyk, Olena ............... HK 20.7
Lipartia, E. HK 5.8, HK 13.7, HK 46.2
Lippmann, Christian ......... HK 45.6
Litvinov, S. A. ................HK 2.2
Litvinov, Yu. A. ...HK 2.2, HK 2.4,
HK 2.6
Litvinova, E. ................ HK 19.8
Liu, Y.-W. ....................HK 3.1
Lo Bianco, G. ...... HK 10.6, HK 10.7
Löbner, K. E.G. ...............HK 2.2
Löhner, H. .HK 3.3, HK 3.4, HK 11.33
Löring, Ulrich .................HK 6.6
Loizides, Constantin ......... HK 18.5
Lopez-Martens, A. ..HK 10.8, HK 16.9
Lorentz, B. .................HK 11.19
Lorentz, Bernd .............. HK 25.1
Lozeva, R. .......... HK 4.1, HK 10.6
Lu, J. ....................... HK 44.8
Lu, Shaojun ................. HK 31.5
Ludolphs, Wilrid .............HK 14.7
Ludwig, I. ..........HK 17.4, HK 17.6
Ludwig, Inga ................ HK 17.9
Lukasik, Jerzy ............... HK 33.3
LUNA - Collaboration ... HK 15.4,
HK 28.6, HK 34.8
Lunardi, S. ... HK 10.7, HK 10.24,
HK 29.1, HK 29.5
Lungwitz, B. ..HK 14.11, HK 14.12,
HK 21.1, HK 21.5, HK 21.6,
HK 21.7, HK 21.8, HK 21.9
Lungwitz, Benjamin ...........HK 7.6
Lutter, R. .........HK 10.21, HK 12.4
Lyubovitskij, V. E. ...........HK 24.6
Lyubovitskij, Valery ..HK 5.3, HK 32.2
Münzenberg , G. .............HK 12.7
Ma, W. C. .................. HK 10.7
Maas, Axel .................. HK 40.1
Macharashvili, G. ........... HK 11.19
Machner, Hartmut HK 11.20, HK 27.7
Märkisch, Bastian ........... HK 48.9
MAFF - Collaboration ...... HK 12.14
Mahgoub, M. .............. HK 10.21
Mahjour-Shafiei, M. .HK 3.3, HK 3.4,
HK 11.33
Mahmoud, Tariq ............HK 12.40
Mahnke, Nils ................ HK 11.1
Maier, H. J. ...... HK 10.21, HK 16.2
Maier, H.-J. ................HK 12.13
Maier, L. ..HK 2.2, HK 2.4, HK 2.6,
HK 10.20
Maier, R. .......... HK 25.5, HK 31.1
Maier, Rudolf ................HK 25.1
Maier-Komor, P. . HK 19.3, HK 23.2,
HK 23.3
Maj, A. ...HK 10.6, HK 10.8, HK 16.9
Makela, M. ..................HK 42.5
MALLION, S. ............... HK 16.4
Mallion, Stephen ............ HK 16.3
Mandal, S. ..........HK 4.1, HK 10.6
Manil, B. .....................HK 3.1
Margenian, N. ............... HK 10.5
Marginean, N. .... HK 10.18, HK 29.1
Marin, Ana ..................HK 35.1
Markum, Harald .............. HK 5.9
Markushin, V. E. ..............HK 3.1
Martemyanov, Boris ......... HK 47.1
Martens, Gunnar ........... HK 13.12
Martin, Anna ................HK 17.2
Martin, I. .....................HK 3.7
Martinez, Cristina ............HK 24.2
Martinez, T. ............... HK 10.18
Martinéz-Pinedo, G. ......... HK 42.3
Marton, Johann ............. HK 37.1
Matea, Iolanda .............. HK 16.3
Materna, Thomas ... HK 4.6, HK 25.4
Matic, A. .................. HK 10.12
Matos, M. ....................HK 2.6
Mato ˇ . s, M. ..........HK 2.2, HK 2.4
Matthiä, D. ... HK 17.4, HK 17.6,
HK 17.9
Mattiello, S. ...HK 13.13, HK 20.5,
HK 46.1
McMahon, M. A. ............ HK 23.1
Meczynski, W. ...............HK 10.6
Mehmandoost-Khajeh-dad, A. A.
HK 3.4
Mehta, D. ...................HK 10.6
Meier, R. ... HK 11.22, HK 11.23,
HK 27.6, HK 38.4
Meier, Rudolf .............. HK 11.24
Meissner, Ulf-G. ............. HK 13.9
Meißner, U.-G. ................HK 5.6
Meißner, Ulf-G. .. HK 5.1, HK 5.11,
HK 13.10
Melde, Thomas ..............HK 32.1
Meli, Athina .................HK 42.8
Menegazzo, R. . HK 10.24, HK 29.1,
HK 29.5
Menke, R. ..................HK 11.19
Menke, Ricarda ..............HK 30.8
Meot, Victor ................ HK 16.3
Mergel, E. ..................HK 12.13
Merschmeyer, Markus ........HK 41.3
Mersmann, Timo ............ HK 30.8
Merten, Dirk ........ HK 6.5, HK 24.3
Mertens, Th. ................ HK 30.7
Mertzimekis, T. J. ........... HK 23.1
Messchendorp, J. ...HK 3.4, HK 11.33
Metag, V. ...................HK 12.8
Metsch, Bernard .. HK 6.5, HK 6.6,
HK 24.3
Metz, Andreas ...............HK 40.7
Metzger, J. ....HK 17.4, HK 17.6,
HK 17.9
Meurer, C. ... HK 14.11, HK 21.1,
HK 21.5, HK 21.6, HK 21.8,
HK 21.9
Meurer, Christine ............ HK 21.7
Meurer, M. .................HK 14.12
Meyer, Werner ...............HK 45.1
Migura, Sascha ............... HK 6.5
Mihailescu, L. .............. HK 10.24
Index of Authors
Mikirtytchiants, Maxim ...... HK 45.2
Mikirtytchiants, S. ..........HK 11.19
Milin, M. ...................HK 10.18
Millon, B. ................... HK 10.6
MINIBALL - Collaboration HK 10.21,
HK 12.13
Mischke, Andre ..............HK 50.1
Mishima, K. .................HK 42.2
Mitrovski, M. . HK 14.11, HK 14.12,
HK 21.1, HK 21.5, HK 21.6,
HK 21.8, HK 21.9
Möller, O. ....HK 10.5, HK 10.23,
HK 29.1, HK 29.3, HK 35.3
Möller, Oliver ................HK 10.4
Mohr, P. .................... HK 34.5
Mojzis, M. ................... HK 5.8
Mol, A. .................... HK 10.12
Morek, T. ................... HK 29.5
Morgan, T. ...... HK 10.21, HK 12.13
Morgenstern, R. ............. HK 12.5
Morsch, A. ................. HK 12.39
Moschini, F. ..................HK 3.7
Mosconi, Marita ............. HK 34.6
Mosel, Ulrich ...HK 5.7, HK 13.11,
HK 13.12, HK 20.7, HK 24.1,
HK 38.6, HK 46.7, HK 47.5
Motta, D. ................... HK 15.6
Motta, Dario ................ HK 42.1
Mousa, J. ................... HK 18.1
Moussallam, Bachir ..........HK 32.6
Mücher, D. ....HK 16.8, HK 19.4,
HK 19.10, HK 29.2, HK 29.4,
HK 34.2, HK 34.3
Mühlich, Pascal ...............HK 5.7
Müller, Beatrix .............. HK 48.2
Müller, Norbert .............HK 12.21
Müller, S. ... HK 10.11, HK 10.14,
HK 16.7, HK 19.5, HK 19.7,
HK 19.8, HK 34.1, HK 34.4,
HK 34.5
Müller, Stefan E. ............. HK 3.2
Müller, Wolfgang F. O. ...... HK 25.2
Münch, M. ....... HK 10.21, HK 12.9
Münzenberg, G. ...HK 2.2, HK 2.6,
HK 4.3
Mukherjee, B. ................ HK 3.4
Mukherjee, M. ................HK 4.4
Mukherjee, Manas ..........HK 12.28
Mulder, J. ...................HK 12.5
Muralithar, S. ............... HK 10.6
Mussgiller, A. ....HK 11.16, HK 11.19
Mutterer, M. ................ HK 33.7
Mutterer, Manfred ...........HK 33.8
Muñoz Horta, Raquel .......HK 12.27
Máté, Z. ...........HK 16.2, HK 34.5
M—nzenberg, G. ............. HK 2.4
NA49 - Collaboration ... HK 14.11,
HK 14.12, HK 21.1, HK 21.5,
HK 21.6, HK 21.8, HK 21.9,
HK 21.10
NA49 collaboration - Collaboration
HK 21.7
NA60 - Collaboration ........ HK 21.4
Nähle, Ole ................. HK 11.37
Nagel, Thiemo ............. HK 12.34
Nanova, Mariana ............ HK 44.4
Napoli, D. R. .. HK 10.1, HK 10.18,
HK 10.19, HK 10.24, HK 29.5
Napolitani, P. .....HK 10.26, HK 33.6
Napolitani, Paolo ............ HK 29.6
Naumann, Lothar ............HK 47.3
Nebel, Florian .............. HK 12.14
Neff, Thomas ........ HK 6.8, HK 9.1
Negret, A. HK 3.8, HK 37.4, HK 43.2,
HK 43.7
Negret, Alexandru ........... HK 43.4
Nellen, Robert ...............HK 31.4
Nelms, N. .................... HK 3.1
Nenoff, N. .......... HK 8.3, HK 10.7
Nesvishevski, Valeri .......... HK 33.8
NEUGART, R. .............. HK 16.4
Neumann-Cosel, P. von ....... HK 3.9
Neumayr, J. ........HK 4.3, HK 12.11
Neumayr, J. B. ............... HK 4.4
Neusser, A. ..................HK 10.7
Neußer, A. .........HK 10.8, HK 16.9
Neußer, A. .......... HK 8.3, HK 10.6
NEYENS, G. ................ HK 16.4
Neyens, Gerda ...............HK 16.3
nGDH-collaboration - Collaboration
HK 27.2
Nickel, Dominik ............. HK 26.3
Niedermaier, O. ............ HK 10.21
Niedermaier, Oliver ......... HK 12.37
Nieminen, A. ................. HK 2.9
Nikolaev, Nikolai N. ..........HK 47.2
Nioradze, M. ............... HK 11.19
Niskanen, Jouni .... HK 11.5, HK 11.9
Nißler, R. ................... HK 46.2
Nißler, Robin .......HK 13.6, HK 46.3
Nolden, F. ... HK 2.2, HK 2.4, HK 2.6
Novikov, Y. N. ................HK 4.3

Novikov, Yu. N. .. HK 2.2, HK 2.4,
HK 2.6
Novotny, R. ................. HK 12.8
Novotny, Rainer ............. HK 39.1
Nowacki, F. ................. HK 23.2
Nowak, Helena ............. HK 11.30
Nuenighoff, K. ................HK 4.9
Nyakó, B. M. ...... HK 10.8, HK 16.9
O’ Brien, S. ................ HK 48.10
Oberstedt, S. ................HK 37.7
Oers, W. v. ..................HK 31.1
Ohtsubo, T. ..HK 2.2, HK 2.4, HK 2.6
Orfanitskiy, Sergey ...........HK 31.4
Orlowski, Marius .HK 12.19, HK 12.27
Ossmann, Jens .............. HK 13.2
Ostrick, Michael ............. HK 49.2
Ostrowski, A. .................HK 2.2
Ostrowski, A. N. ..............HK 2.4
Otto, Stephan ..............HK 11.39
Otwinowski, J. ...............HK 14.5
Ozawa, A. ............HK 2.2, HK 2.4
Paar, Nils .................... HK 9.1
Pacati, Franco Davide .........HK 3.6
Paech, Kerstin ...............HK 14.2
Paetz gen. Schieck, H. .. HK 12.12,
HK 37.5, HK 37.6
Paetz gen. Schieck, Hans ..HK 34.9,
HK 45.2
Pagano, Paolo ...............HK 17.2
Pal, Uttam .................HK 12.37
Paleni, A. ................... HK 10.5
panda - Collaboration ... HK 17.1,
HK 39.1, HK 39.5, HK 39.6
Pantea, M. ..................HK 12.4
Panteleeva, Anna ............ HK 4.10
Papka, P. ........HK 10.18, HK 10.19
Pasini, M. ...................HK 25.3
Pasini, Matteo ... HK 12.10, HK 12.17
Passler, Gerd ...............HK 12.28
Pasternak, A. A. .. HK 10.25, HK 29.5
Patalakha, Olexandr ......... HK 25.2
Patyk, Z. .....................HK 2.2
Paul, S. ....................HK 11.38
Paul, Stephan . HK 12.16, HK 12.33,
HK 12.34, HK 31.6, HK 45.4
Pawelke, Jörg ............... HK 4.10
Pechinov, Vladimir ...........HK 31.2
Pejovic, P. .................. HK 35.3
Pelizäus, Marc ...............HK 44.7
Penionzhkevich, Yu. E. .......HK 16.3
Perdue, B. ................. HK 10.14
Pereira, J. ....HK 10.26, HK 33.6,
HK 41.6
Pereira, Jorge ............... HK 12.6
Perez, Tiago ....... HK 18.2, HK 18.3
Peshier, André ...............HK 46.5
Peters, Klaus ...............HK 11.30
Petkov, P. ......... HK 10.5, HK 29.1
Petrache, C. ... HK 10.5, HK 10.6,
HK 10.7
Petrick, M. ................... HK 4.3
Petrov, Guenadi ............. HK 33.8
Petry, Herbert-R. ..HK 6.5, HK 6.6,
HK 24.3
Petzold, Andreas ............ HK 18.9
Petzoldt, Gerd . HK 12.19, HK 12.27,
HK 12.33, HK 45.4
Pfeiffer, B. ........... HK 2.2, HK 2.4
Pfeiffer, Bernd ...............HK 28.3
Phair, L. .................... HK 23.1
Phalet, T. ...................HK 43.6
PHENIX - Collaboration ...HK 7.4,
HK 7.5, HK 14.13, HK 14.14
PHENIX Collaboration - Collaboration
HK 7.1
Pichlmaier, A. .... HK 12.18, HK 42.2
Pichlmaier, Axel ...HK 12.15, HK 42.5
Picker, Rüdiger ... HK 12.33, HK 45.4
Pietralla, N. ... HK 10.2, HK 16.7,
HK 19.4, HK 19.10, HK 29.2,
HK 29.4, HK 34.2, HK 34.3
Pigni, Marco ............... HK 12.44
Pinaev, I. .................. HK 10.14
Pinston, J. ................. HK 16.10
Pirner, Hans-Jürgen HK 20.2, HK 20.3
Piskor-Ignatowicz, C. ....... HK 11.14
Pitz, H. H. ....HK 16.7, HK 19.4,
HK 29.4, HK 34.2, HK 34.3
Plag, R. .......... HK 34.7, HK 48.10
Plass, W. ............ HK 2.6, HK 4.4
Platter, Lucas ............... HK 32.7
Platz, M. .......... HK 10.9, HK 12.1
Platz, Markus ............... HK 25.2
Plaß, W ....................HK 12.11
Plaß, W. R. .................. HK 4.3
Plessas, Willibald ....HK 5.9, HK 32.1
Plettner, C. ................. HK 10.1
Pobylitsa, Pavel ............. HK 40.7
Podchasky, S. ............... HK 45.3
Podsvirova, E. O. . HK 10.25, HK 29.5
Polleri, Alberto .............. HK 47.6
Polyakov, Maxim .HK 13.2, HK 24.7,
HK 40.7, HK 44.6, HK 49.1
Polyakov, Maxim V. ......... HK 40.8
Ponomarev, V. Yu. .HK 3.9, HK 19.1,
HK 19.6
Popescu, L. .... HK 3.8, HK 37.4,
HK 43.2, HK 43.7
Popescu, Lucia-Ana ..........HK 43.3
Poppenhäger, Katja ..........HK 40.4
Portillo, M. .. HK 2.2, HK 2.4, HK 2.6
Post, Marcus ................ HK 24.4
Powell, J. ................... HK 23.1
Prasuhn, Dieter ..............HK 25.1
Procura, Massimiliano ....... HK 26.1
Przerwa, Joanna ............HK 11.13
Pühlhofer, F. ............... HK 21.10
Pullirsch, Rainer .....HK 5.9, HK 26.5
Pumsa-ard, Kem ... HK 24.6, HK 32.2
Putschke, Jörn ................HK 7.2
Pysmenetska, I. ..............HK 34.3
Pérez, T. ....................HK 18.4
P̷l. oskoń, Mateusz .......... HK 41.1
QCDSF and UKQCD - Collaboration
HK 26.2
Quandt, Markus ............. HK 40.2
Quint, W. .................... HK 4.4
R., Henneck ................HK 12.18
R3B/NUSTAR - Collaboration .HK 2.1
Radomski, S. ..HK 14.11, HK 14.12,
HK 21.1, HK 21.5, HK 21.6,
HK 21.7, HK 21.8, HK 21.9
Radomski, Sylwester ........ HK 14.15
Radon, T. .................... HK 2.2
Radtke, Eric .................HK 45.1
Rätz, D. .................... HK 42.2
Ragnarsson, I. ............... HK 10.3
Raha, Udit .................. HK 13.9
Rahaman, S. ................. HK 4.4
Rahmede, Christoph ......... HK 40.4
Raiola, Franceso ............. HK 28.6
Rakers, S. HK 3.8, HK 37.4, HK 43.2,
HK 43.7
Ramachandran, G. ..........HK 11.11
Ramström, E. ............... HK 37.8
Raskinyte, Imante .......... HK 12.44
Rathmann, F. .............. HK 11.19
Rathmann, Frank ...HK 36.3, HK 45.2
Ratti, Claudia ............... HK 46.4
Rauscher, T. .. HK 10.11, HK 34.1,
HK 34.5
Reddy, T. S. .................HK 10.6
Reggiani, Davide ........... HK 12.35
Reicherz, Gerhard ............HK 45.1
Reifarth, R. ....... HK 34.7, HK 48.10
Reinhardt, Hugo ....HK 40.2, HK 46.8
Reischl, Andreas .............HK 39.4
Reiter, P. .... HK 10.6, HK 10.21,
HK 12.13
Reitz, B. ..................... HK 3.9
Rejmund, Fanny ............. HK 29.6
Renfordt, R. .. HK 12.43, HK 14.11,
HK 14.12, HK 21.1, HK 21.5,
HK 21.6, HK 21.7, HK 21.8,
HK 21.9, HK 45.7
Renk, Thorsten ..............HK 14.3
REX-ISOLDE - Collaboration .HK 25.3
REX-MINIBALL - Collaboration
HK 16.1
Ricard-McCutchan, E. A. .....HK 42.7
Ricciardi, M. V. .HK 10.26, HK 33.6,
HK 41.6
Ricciardi, Maria Valentina ....HK 29.6
Richard, A. ...HK 14.11, HK 14.12,
HK 21.1, HK 21.5, HK 21.6,
HK 21.7, HK 21.8, HK 21.9
Richter, A. HK 3.8, HK 3.9, HK 10.9,
HK 10.15, HK 11.34, HK 12.1,
HK 12.2, HK 19.1, HK 19.6,
HK 37.4, HK 42.3
Richter, Achim .............. HK 25.2
Riek, Felix ...................HK 20.1
Rinneberg, Herbert .......... HK 48.7
RISING - Collaboration ... HK 2.8,
HK 4.1, HK 10.6, HK 23.4
Rith, Klaus ..................HK 44.1
Ritman, J. .................. HK 31.1
ritman, james ...HK 17.1, HK 18.3,
HK 39.5
Rochow, W. .................HK 33.7
Roderburg, Eduard ...........HK 31.4
Rodin, Vadim ............... HK 40.5
Rodriguez, D. .................HK 4.4
Röder, Dirk ................. HK 26.7
Rogachevskiy, A. .... HK 4.7, HK 12.5
Rohdjes, H. ................ HK 11.19
Rohdjeß, Heiko .............. HK 30.1
Rohe, Daniela ................ HK 9.2
Rolfs, Claus ................. HK 28.6
Rossi Alvarez, C. ........... HK 10.24
Rost, M. ................... HK 17.10
Roth, Robert .........HK 6.8, HK 9.1
Rousseau, M. .... HK 10.18, HK 10.19
Roussiere, Brigitte ........... HK 37.3
Roy, Ankhi ................. HK 11.25
Ro˙zek, T. .................. HK 11.15
Rubacek, Lukas .... HK 31.5, HK 39.2
Rudolph, K. ................. HK 25.3
Rugel, G. ....................HK 42.6
Rundberg, R. S. ............. HK 34.7
Ruppert, Jörg ............... HK 26.7
Rusetsky, A. ..................HK 5.8
Rusetsky, Akaki ..... HK 5.5, HK 13.9
Rusev, G. .HK 19.9, HK 34.2, HK 43.1
Rustamov, Anar ............. HK 31.2
Ryckebusch, J. .............. HK 28.5
Ryckebusch, Jan ... HK 24.2, HK 24.3
Ryezayeva, N. ....... HK 3.8, HK 37.4
Rz¸aca-Urban, T. .. HK 10.24, HK 29.5
S221 - Collaboration .........HK 23.7
Saha, B. .................... HK 29.1
Sahlmüller, Baldo .............HK 7.5
Sailer, B. ....................HK 12.9
Saito, N. .................... HK 10.6
Saito, T. .................... HK 10.6
Sako, Hiro ...................HK 21.2
Salabura, P. ................. HK 18.1
Samuel, Deepak ............ HK 18.12
Sanchez-Vega, M. ... HK 4.7, HK 12.5
Sandoval, A. ..HK 12.39, HK 14.11,
HK 14.12, HK 21.1, HK 21.5,
HK 21.6, HK 21.7, HK 21.8,
HK 21.9
Sann, H. ................... HK 12.43
SAPHIR - Collaboration ......HK 38.1
SAPHIR - Collaboration - Collaboration
HK 11.26, HK 11.27
Sarantites, D. G. .............HK 29.7
Sarantsev, Andrey .......... HK 13.14
Sassen, Felix ........ HK 5.2, HK 32.4
Sauvage, Jocelyne ........... HK 37.3
Savran, D. ...HK 10.12, HK 10.14,
HK 16.7, HK 19.5, HK 19.7,
HK 19.8, HK 34.1
Schaedel, Matthias .......... HK 14.1
Schäfer, Andreas ... HK 26.4, HK 26.5
Schaefer, Bernd-Jochen ...... HK 20.4
Schäfer, Daniel .............. HK 18.3
Schaefer, Stefan ............. HK 26.4
Schäfer, Wolfgang ........... HK 47.2
Schaffner, H. ................ HK 10.6
Schaile, o. ..................HK 10.21
Scheck, M. ....HK 16.7, HK 19.4,
HK 29.4, HK 34.2, HK 34.3
Scheid, W. .................. HK 33.4
Scheidenberger, C. . HK 2.2, HK 2.4,
HK 2.6, HK 4.3, HK 12.11
Scheidenberger, Christoph ....HK 33.5
Scheit, H. ..................HK 10.21
Scheit, Heiko ..HK 10.16, HK 12.37,
HK 16.1
Schempp, Alwin HK 12.17, HK 12.21,
HK 12.22, HK 12.23, HK 12.24,
HK 12.25, HK 12.26, HK 25.6,
HK 25.7
Schenke, Bjoern ............. HK 14.6
Scherer, Stefan .............. HK 32.3
Scherillo, A. ...... HK 16.10, HK 23.3
Schielke, S. ....HK 19.3, HK 23.2,
HK 23.3
Schill, C. . HK 17.4, HK 17.6, HK 17.9
Schilling, K. D. .....HK 19.9, HK 43.1
Schimpf, Erwin .............. HK 14.1
Schindler, Matthias R. ....... HK 32.3
Schlegel, Marc ...............HK 40.7
Schleichert, R. ..............HK 11.19
Schmelzbach, P. A. ........... HK 3.1
Schmidt, H. R. ....HK 12.43, HK 45.7
Schmidt, K.-H. . HK 10.26, HK 33.6,
HK 41.6
Schmidt, Karl-Heinz HK 12.6, HK 29.6
Schmidt-Böcking, Horst .....HK 12.24
Schmitt, L. ....... HK 11.38, HK 18.8
Schmitt, Lars ..... HK 12.34, HK 22.3
Schnare, H. ................. HK 10.1
Schnase, Alexander .......... HK 25.1
Schneider, Herbert ...........HK 25.1
Schneider, Roland ........... HK 20.6
Schneider, Sonja .............HK 38.2
Schönert, S. ....... HK 15.6, HK 42.6
Schönert, Stefan .............HK 42.1
Schönwasser, G. ............. HK 10.7
Schönwaßer, G. ...............HK 8.3
Scholl, C. .......... HK 16.6, HK 29.4
Scholten, Olaf ..HK 13.15, HK 38.7,
HK 38.8
Schott, Wolfgang HK 12.16, HK 12.33,
HK 45.4
Schrieder, G. ...HK 3.8, HK 11.34,
HK 12.4
Schuck, P. .................. HK 14.4
Schürmann, C. ............. HK 12.13
Schürmann, Daniel .......... HK 48.5
Schulday, Inez .............. HK 11.26
Schulte-Wissermann, M. ..... HK 27.3
Schulz, Ch. .................HK 10.19
Index of Authors
Schulze, R. .................HK 12.12
Schumann, Michael .........HK 12.17
Schumann, S. .............. HK 11.35
Schwalm, Dirk ... HK 10.16, HK 12.37
Schwamb, Michael ....HK 3.5, HK 3.6
Schwan, U. ..................HK 15.6
Schwan, Ute .................HK 42.1
Schwarz, Carsten ............ HK 39.6
Schwarz, Stefan ............ HK 12.28
Schweiger, Wolfgang ..........HK 6.2
Schweitzer, Peter ............ HK 13.2
Schwengner, R. ..HK 10.1, HK 19.9,
HK 34.2, HK 43.1
Schwenzer, Kai .............. HK 20.2
Schwerdtfeger, W. HK 10.21, HK 12.13
Sefzick, Thomas .............HK 31.4
Seifert, Frank ................HK 48.7
Seitz, Björn ................. HK 31.5
Seliverstov, Maxim ...........HK 37.3
Sengl, Bianka ....... HK 5.9, HK 32.1
Serebrov, A. ....... HK 42.2, HK 42.5
Sergeev, L. .................HK 11.34
Setter, D. HK 17.4, HK 17.6, HK 17.9
Severijns, N. .................HK 43.6
Seyfarth, Hellmut ............HK 45.2
Shanidze, R. .................HK 44.8
Sharon, Y. Y. ................HK 19.3
Shende, S. V. ...... HK 3.4, HK 11.33
Shevchenko, A. ...HK 3.8, HK 3.9,
HK 19.1, HK 37.4
Shimbara, Y. ................. HK 3.9
SHIPTRAP - Collaboration . HK 4.3,
HK 33.2
Shishkin, V. .................. HK 2.6
Shklyar, Vitaly ...............HK 38.6
Shovkovy, Igor ...............HK 20.8
Sibirtsev, Alexander HK 11.2, HK 11.3,
HK 11.4, HK 11.5, HK 11.6,
HK 38.5
Sieber, T. ................... HK 25.3
Sieber, Thomas .. HK 12.10, HK 12.17
Sikler, G. .....................HK 4.4
Sikora, Mario ................HK 31.9
Simon, Frank ................. HK 7.3
Simon, H. .HK 2.7, HK 3.8, HK 12.4,
HK 12.7, HK 43.2
Simon, Haik .................HK 50.3
Simons, L. M. ................ HK 3.1
Simpson, G. S. ............. HK 16.10
Simpson, J. ................. HK 10.7
Singh, A. K. ....HK 8.3, HK 10.6,
HK 10.7, HK 10.8, HK 16.9
Singh, N. ....................HK 10.7
Siodmok, A. ................HK 12.18
Sirotzki, Simone ............HK 12.28
Skoda, S. ................... HK 10.1
Skorodko, T. .......HK 27.6, HK 38.4
Sletten, G. HK 10.7, HK 10.8, HK 16.9
Smirenin, Yu. ...............HK 11.34
Smirnova, Nadya ...HK 16.3, HK 36.2
Smirnova, Nadya A. ......... HK 16.5
Smit, F. D. ..................HK 19.1
Sobolev, Iouri ............... HK 48.7
Sobolev, Yuri .... HK 12.19, HK 12.27
Sofianos, S. A. .............. HK 14.4
Sohani, M. .................. HK 12.5
Sokolov, Andrei ..............HK 39.5
Sommer, Wolfgang ..........HK 31.5
Somorjai, E. .................HK 34.5
Sonnabend, K. . HK 10.11, HK 19.5,
HK 19.7, HK 19.8, HK 34.1,
HK 34.4
Spaan, Bernhard .............HK 18.9
Speidel, K.-H. .. HK 19.3, HK 23.1,
HK 23.2, HK 23.3
Speth, Josef ................HK 11.10
Speth, Joseph ............... HK 11.8
Spruck, B. ...................HK 12.8
Stadlmann, J. HK 2.2, HK 2.4, HK 2.6
Staniou, M ..................HK 16.3
STAR - Collaboration .HK 7.2, HK 7.3
Stassen, Rolf ................ HK 25.1
Steck, M. ....HK 2.2, HK 2.4, HK 2.6
Stedile, F. HK 16.7, HK 19.4, HK 29.4,
HK 34.3
Stefanescu, I. ...... HK 10.3, HK 43.8
Steffens, Erhard ............ HK 12.35
Steijger, Jos .................HK 39.4
Stein, Eckart ................ HK 11.1
Steinbeck, Timm M. .........HK 18.6
Steinhardt, T. .. HK 10.1, HK 10.3,
HK 29.7, HK 43.8
Steinke, Matthias ............HK 22.2
Stelzer, H. ........ HK 12.43, HK 45.7
Stenzel, Hasko ...............HK 31.5
Stinzing, Friedrich .......... HK 11.37
Stock, R. ... HK 14.11, HK 14.12,
HK 21.1, HK 21.5, HK 21.6,
HK 21.7, HK 21.8, HK 21.9,
HK 21.10
Stockhorst, Hans ............ HK 25.1
Stockmeier, Marc R. ........HK 12.41

Stöcker, Horst ...............HK 40.4
Stoyanov, C. ................ HK 19.4
Stratmann, Simone .......... HK 40.8
Strauch, Steffen .............. HK 1.2
Straumann, U. ...............HK 42.5
Strauss, S. HK 14.4, HK 20.5, HK 46.1
Strecker, Herbert ............ HK 15.5
Strieder, Frank .............. HK 28.1
Strikman, M. ........HK 7.8, HK 40.6
Ströbele, H. .. HK 14.11, HK 14.12,
HK 21.1, HK 21.5, HK 21.6,
HK 21.7, HK 21.8, HK 21.9,
HK 21.10
Stroebele, Herbert ........... HK 31.2
Ströher, H. ....... HK 11.19, HK 31.1
Stroth, Joachim ....HK 31.2, HK 35.2
Sturm, Christian .............HK 31.2
Sun, G. Y. .................. HK 27.3
Sundermann, Jan Erik ....... HK 18.9
Super-FRS/NUSTAR - Collaboration
HK 2.5, HK 33.5
Suzuki, T. ............HK 2.2, HK 2.4
Sytcheva, Arina ..............HK 6.10
Szelc, A. ................... HK 12.18
Szerypo, J. . HK 2.9, HK 4.4, HK 16.2
S—mmerer, K. ............... HK 2.4
Taieb, J. ................... HK 10.26
Tait, Phil .................. HK 12.35
Takahashi, K. .................HK 2.6
Tanner, L. ..................HK 12.18
Tascau, Oana ............... HK 15.7
Taylor, M. J. ................ HK 23.1
Tenckhoff, G. ...............HK 12.12
Teufel, Andreas .............HK 11.37
Thaler, Michael ..............HK 20.6
Thelen, O. ....HK 10.1, HK 10.3,
HK 29.7, HK 43.8
Thibus, Jan ................ HK 12.21
Thirolf, P. HK 4.3, HK 10.21, HK 12.4,
HK 12.11, HK 12.13
Thirolf, P. G. ........HK 4.4, HK 16.2
Thomas, Andreas ............HK 27.2
Thomas, Anthony W. ... HK 11.2,
HK 11.4, HK 38.5
Thummerer, S. .. HK 10.18, HK 10.19
Tilsner, Heinz ............... HK 18.7
Timmermans, R. .............HK 12.5
Titze, Otto ..................HK 25.2
Tlusty, P. ................... HK 18.1
Toelle, Raimund ............. HK 25.1
Toia, Alberica ......HK 18.2, HK 18.3
Tomei, Claudia .............. HK 15.5
Tonchev, A. .......HK 10.14, HK 16.7
Tonev, D. HK 10.5, HK 29.1, HK 35.3
Torilov, S. ..................HK 10.18
Tornow, W. ................ HK 10.14
Tortorella, Daniele .HK 12.16, HK 45.4
Trassinelli, M. ................ HK 3.1
Trautmann, Dirk .............HK 7.10
Traxler, M. ..................HK 12.9
Traxler, Michael ............. HK 18.3
Traykov, E. . HK 4.7, HK 4.7, HK 12.5
Traykov, H. H. ................HK 4.8
TRIC - Collaboration ....... HK 18.12
Trippel, S. HK 17.4, HK 17.6, HK 17.9
Trnka, David ................ HK 27.4
Tsiledakis, Georgios .........HK 12.39
Tsoneva, N. ................. HK 19.4
Tsoneva, Nadezhda ..........HK 19.2
Tsushima, Kazuo ...HK 11.3, HK 11.4
Tudora, A. .................. HK 37.7
Tuerler, Andreas .............HK 14.1
Tumino, A. .................HK 10.18
Turzo, Ketel .................HK 16.3
Tyminski, Zbigniew .......... HK 41.5
Typel, S. ..................... HK 2.2
Typel, Stefan ................HK 23.6
Ucar, Aziz ...................HK 31.4
Ullrich, Joachim ............ HK 12.24
Ulrich, Ralf ..................HK 15.7
Unverzagt, M. ..............HK 11.35
Ur, C. .HK 10.18, HK 10.19, HK 10.24
Ur, C. A. ....................HK 29.1
Urban, W. ........ HK 10.24, HK 29.5
Urbano, Diana ...............HK 13.2
Usov, Alexander ............. HK 38.7
Utsuro, M. .................. HK 42.2
Uzikov, Yu. .................HK 11.19
Valdau, Y. ................. HK 11.17
Van Cauteren, Tim .......... HK 24.3
van de Vel, Karen ............HK 37.3
van den Berg, A. .HK 3.8, HK 11.33,
HK 37.4, HK 43.2, HK 43.7
van den Berg, A. M. HK 3.4, HK 10.12
van den Brandt, B. .......... HK 42.2
van der Graaf, Emiel .........HK 28.4
van der Grinten, Maurits . HK 12.19,
HK 12.27
van Duppen, Piet ............HK 37.3
Van Dyck, Annelies .......... HK 16.5
van Garderen, E. .. HK 3.3, HK 3.4,
HK 11.33
Van Hoorebeke for the VCS collaboration
at MAMI and the Jefferson Lab Hall
A/VCS collaboration, Luc .HK 9.3
Van Overmeire, Bart .........HK 24.2
van Pee, Harald ............. HK 44.3
Vanhoy, J. R. ................HK 29.3
Vantournhout, K. ............HK 28.5
Varentsov, V. .................HK 4.4
Varma, Raghava ............HK 11.25
Vasilevsky, Viktor ............HK 6.10
Vassiliev, Alexandre ..........HK 45.2
Venkova, T. ................. HK 29.5
Venkova, Ts. ............... HK 10.24
Venturelli, R. ...............HK 18.10
VERMEULEN, N. ........... HK 16.4
Vermeulen, Nele ............. HK 16.3
Versyck, S. .................. HK 43.6
Vidya, M. S. ............... HK 11.11
Vieira, D. ............ HK 2.2, HK 2.4
Vladuca, G. ................. HK 37.7
Vockenhuber, Christof .........HK 8.4
Vogel, Petr ..................HK 40.5
Vogel, Sascha ............... HK 40.4
Vogelaar, R. .................HK 42.5
Vogt, K. HK 10.11, HK 19.5, HK 19.7,
HK 19.8, HK 34.1, HK 34.4
Voit, F. ...................... HK 4.4
Volmer, J. ...................HK 44.8
Volz, S. HK 10.15, HK 19.5, HK 19.6,
HK 19.7, HK 19.8, HK 34.1
von Brentano, P. .HK 10.2, HK 16.6,
HK 16.7, HK 19.4, HK 29.1,
HK 29.4, HK 34.2, HK 34.3
von Brentano, Peter ........ HK 10.17
von Egidy, T. ................HK 29.3
von Garrel, H. .. HK 16.7, HK 19.4,
HK 29.4, HK 34.2, HK 34.3
von Hippel, G. M. ........... HK 26.6
von Hodenberg, M. HK 17.4, HK 17.6,
HK 17.9
von Neumann-Cosel, P. ... HK 3.8,
HK 10.9, HK 10.15, HK 12.1,
HK 19.1, HK 19.6, HK 34.3,
HK 37.4, HK 42.3, HK 43.7
von Oertzen, W. HK 10.18, HK 10.19,
HK 10.21
von Wrochem, Florian ...... HK 11.24
Vranic , D. ........HK 12.43, HK 45.7
Vretenar, Dario ..............HK 5.10
Wadsworth, R. .............. HK 10.1
Wagenbrunn, Robert F. ....... HK 5.9
Wagenbrunn, Robert Ferdinand
HK 32.1
Wagner, A. ........ HK 19.9, HK 43.1
Wagner, G. J. . HK 11.22, HK 11.23,
HK 27.5, HK 27.6, HK 38.4
Wagner, Gerhard J. .........HK 11.24
Wagner, Marc ..............HK 11.37
Wagner, Markus .............HK 47.4
Wagner, Wolfgang ...........HK 4.10
Walcher, Th. ............... HK 17.10
Walter, S. HK 16.7, HK 19.4, HK 29.4,
HK 34.2, HK 34.3
Wambach, J. ... HK 3.9, HK 19.1,
HK 19.6
Wambach, Jochen HK 20.4, HK 26.3,
HK 40.1
Wang, Ping ................. HK 32.2
Wang, Z. .. HK 4.3, HK 4.4, HK 12.11
Warr, N. .... HK 10.3, HK 10.21,
HK 19.10, HK 23.3, HK 29.3,
HK 43.8
WASA - Collaboration ....... HK 31.1
Watzlawik, S. ..HK 10.9, HK 11.34,
HK 12.1
Watzlawik, Steffen ...........HK 25.2
Webb, Richard .... HK 11.37, HK 17.2
Weber, C. .................... HK 4.4
Weber, H. J. .. HK 13.13, HK 20.5,
HK 46.1
Weick, H. . HK 2.2, HK 2.4, HK 2.6,
HK 2.7, HK 10.6, HK 12.7
Weiland , Thomas ........... HK 25.2
Weinrich, Christoph ..........HK 39.7
Weise, E. .HK 17.4, HK 17.6, HK 17.9
Weise, Wolfram .. HK 5.5, HK 5.10,
HK 13.3, HK 20.6, HK 26.1,
HK 46.4
Weiss, C. ........... HK 7.8, HK 40.6
Weisshaar, D. ..HK 10.3, HK 19.10,
HK 43.8
Weitzel, Q. .................HK 11.38
Weißhaar, Dirk ............... HK 4.2
Weller, H. R. ......HK 10.14, HK 16.7
Wells, A. ..................... HK 3.1
Welsch, Carsten HK 12.24, HK 12.25,
HK 12.26
Welsch, Carsten Peter ...HK 12.23,
HK 25.7
Wendel, Christoph ..........HK 12.20
Wendt, Klaus .............. HK 12.28
Werner, V. ....HK 10.2, HK 16.6,
HK 16.7, HK 16.8, HK 19.4,
HK 29.4, HK 34.2, HK 34.3
Weske, C. ..................HK 12.12
Wheldon, C. .................HK 10.6
Wiechula, Jens .............. HK 45.7
Wiedemann, Urs Achim ...... HK 50.2
Wieland, O. ................. HK 10.6
Wierzinski, Birgit ............ HK 14.1
Wies, Katja ................ HK 12.28
Wiescher, M. ................ HK 34.7
Wiesmann, M. ..............HK 11.38
Wiesmann, Michael ..........HK 31.6
Index of Authors
Wilhelmy, J. B. ..............HK 34.7
Wilk, Alexander ............ HK 12.42
Wilkin, C. ..................HK 11.19
Willmann, L. ........ HK 4.7, HK 12.5
Wilms, Andrea ...HK 11.30, HK 11.31
Wilschut, H. ..................HK 4.7
Wilschut, H. W. .....HK 4.8, HK 12.5
Windelband , B. .. HK 12.43, HK 45.7
Winkler, M. HK 2.2, HK 2.4, HK 2.5,
HK 2.6, HK 10.6, HK 12.7
Winter, Peter ................HK 38.3
Wintz, Peter ................ HK 31.4
Wirth, H.-F. ...HK 10.4, HK 10.23,
HK 16.2, HK 35.3
Wirth, Hans-Friedrich .......HK 10.17
Wirzba, Andreas .............. HK 6.4
Wisshak, K. ........HK 34.2, HK 34.3
Wita̷la, H. ......... HK 37.5, HK 37.6
Wittmann, Markus ...........HK 11.1
Wörtche, H. ................HK 10.12
Wörtche, H. J. ... HK 3.4, HK 3.8,
HK 11.33, HK 37.4, HK 43.2,
HK 43.7
Wörtche, Heinrich Johannes ..HK 36.1
Wojcik, T. .................. HK 18.1
Wokaun, A. ................. HK 42.2
Wolf, Joachim ...............HK 48.3
Wolke, M. ...................HK 31.1
Wollersheim, H. J. ...........HK 10.6
Wollnik, H. ...........HK 2.2, HK 2.4
Wolter, H. ................. HK 10.21
Wolter, H. H. .. HK 37.8, HK 41.4,
HK 47.7
Wronska, A. ................HK 11.19
Wrońska, Aleksandra .........HK 30.9
Wu, Y. ........... HK 10.14, HK 16.7
Xu, Zhe .....................HK 47.8
Yakushev, Alexander ......... HK 14.1
Yamaguchi, T. ... HK 2.2, HK 2.4,
HK 2.6, HK 10.20
Yao, N. ..................... HK 12.7
Yaschenko, S. .....HK 11.19, HK 30.5
Yates, S. W. .................HK 29.3
Yevetska, O. ............... HK 11.34
YORDANOV, D. ............ HK 16.4
Yordanov, Deyan ............ HK 16.3
Yordanov, O. ................ HK 41.6
Yordanov, Orlin .... HK 12.6, HK 29.6
Young, A. ................... HK 42.5
Yurevich, Sergey .............HK 14.8
Zakharov, Bronislav G. .......HK 47.2
Zamfir, N. V. ................HK 42.7
Zamick, L. .................. HK 19.3
Zell, K. O. ......... HK 10.5, HK 29.1
Zell, O. ..................... HK 19.3
Zhang, Chuan ............... HK 25.6
Zhang, Y. H. ................ HK 10.5
Ziegler, Ralf ................HK 11.37
Zilges, A. ... HK 10.11, HK 10.12,
HK 10.13, HK 10.14, HK 12.2,
HK 12.3, HK 19.5, HK 19.7,
HK 19.8, HK 34.1, HK 34.4,
HK 34.5, HK 42.7
Zimmer, Oliver .HK 12.16, HK 12.19,
HK 12.27, HK 12.33, HK 45.4
Zimmermann, Holger ....... HK 12.21
Zmeskal, J. ......... HK 3.1, HK 42.2
Zoller, Vladimir R. ...........HK 47.2
Zovinec, D. ..................HK 18.1
Zschocke, Sven ..............HK 20.9
Zubov, A. S. ................ HK 33.4
Zvyagin, Alexander .......... HK 39.3