Monday, March 11, 2002 - DPG-Tagungen

Nuclear Physics Sectional Programme Overview
Monday, March 11, 2002
AFTERNOON
13.30 Welcome (main auditorium)
13.45
P
14.30
P
15.15
P
A
HK 2
B
HK 3
C
HK 4
D
HK 5
E
HK 6
F
HK 7
HK1 - Talks - from 13.45 to 15.45
Plenary talk
G. t’Hooft (Utrecht)
Instantons and Confinement in QCD
Plenary talk
R. F. Casten (Yale)
A Perspective on Nuclear Structure Physics in
the Context of the U. S. Long Range Planning
Process
Plenary talk
T. Peitzmann (Münster)
Heavy Ion Physics in the RHIC Era
15.45 coffee break
HK2-7 - Talks - from 16.15 to 19.00
Theory I
Nuclear Physics / Spectroscopy I
Nuclear and Particle Astrophysics I
Electromagnetic and Hadronic Probes I
Heavy Ions I
Instrumentation and Applications I
19.30 Welcome reception

Nuclear Physics Sectional Programme Overview
8.30
P
Tuesday, March 12, 2002
MORNING AFTERNOON
HK8 - Talks - from 8.30 to 10.30 HK15 - Talks - from 14.00 to 16.00
Plenary talk
L. v. Smekal (Erlangen)
Aspects of Confinement in QCD: The Glue of
Strong Interactions
14.00
P
Plenary talk
U.-J. Wiese (Bern)
Recent Progress in Lattice QCD
14:45 Plenary talk
9.00 Plenary talk P T. R. Hemmert (München)
P N. Kalantar-Nayestanaki (Groningen) Chiral Extrapolation of Lattice QCD
Search for Three-Body Force Effects data for Baryon Properties
9.30 Plenary talk 15.15 Plenary talk
P C. Sturm (GSI) P A. Zilges (Darmstadt)
Properties of K-Mesons in the Nuclear Electric dipole strength in atomic nuclei -
Medium a key to the breaking of isospin symmetry
10.00 Plenary talk 15.45 Plenary talk
P A. Gillitzer (Jülich) P N. Pietralla (Köln)
Pionic 1s States in Heavy Atoms and Nuclear Physics with a Free Electron Laser
the Pion-Nucleus Interaction
16.15 coffee break
10.30 Poster Session HK16-21 - Talks - from 16.45 to 18.45
and coffee in the Foyer of the Chemistry
building
HK9 bis HK14
A
HK 16
B
HK 17
C
HK 18
D
HK 19
E
HK 20
F
HK 21
Theory II
Nuclear Physics / Spectroscopy II
Nuclear and Particle Astrophysics II
Electromagnetic and Hadronic Probes II
Heavy Ions II
Instrumentation and Applications II
12.45 lunch break 19.30 Evening talk in auditorium H1 (downtown)
Prof. Dr. Dr. Birger Kollmeier (Oldenburg)
Cocktailpartys und Hörgeräte - Neurosensorische Analyse
des auditorischen Systems und ihre Anwendungen -

Nuclear Physics Sectional Programme Overview
Wednesday, March 13, 2002
MORNING AFTERNOON
HK22 - Talks - from 8.30 to 10.15 HK29-34 - Talks - from 14.00 to 15.30
8.30 Plenary talk A Theory IV
P M. Büscher (Jülich) HK 29
Investigation of K + -Meson production
in pp and pA collisions with ANKE B Nuclear Physics / Spectroscopy IV
HK 30
9.00 Plenary talk
P H. Bulten (Amsterdam) C Nuclear Physics / Spectroscopy V
Few-body systems studied with internal HK 31
targets in the NIKHEF electron storage ring
D Electromagnetic and Hadronic Probes IV
9.30 Plenary talk HK 32
P S. Rombouts (Gent)
The Quantum Monte Carlo approach to E Heavy Ions IV
nuclear structure HK 33
10.00 Poster Award Ceremony F Instrumentation and Applications IV
HK 34
10.15 coffee break 15.30 coffee break
HK23 - 28 - Talks - from 10.45 to 12.45
A Theory III
HK 23
B Nuclear Physics / Spectroscopy III
HK 24
C Nuclear and Particle Astrophysics III 16.00 Public session of the ’Komitee
HK 25 -17.45 Hadronen und Kerne’
D Electromagnetic and Hadronic Probes III 18.00 Session of the DPG Fachverband
HK 26 -19.00
E Heavy Ions III
HK 27
F Instrumentation and Applications III
HK 28
12.45 lunch break

Nuclear Physics Sectional Programme Overview
Thursday, March 14, 2002
MORNING AFTERNOON
HK35 - Talks - from 8.30 to 10.30 HK37-42 - Talks - from 14.00 to 15.30
8.30 Plenary talk A Theory V
P K. Jungmann (Groningen) HK 37
The Muon Magnetic Moment
B Nuclear Physics / Spectroscopy VI
9.00 Plenary talk HK 39
P D. Bödeker (Bielefeld)
High-temperature QCD and relativistic C Theory VI
heavy ion collisions HK 38
9.30 Plenary talk D Electromagnetic and Hadronic Probes V
P K. Helbing (Erlangen)
Experimental verification of the GDH
HK 40
sum rule at ELSA and MAMI E
HK 41
Heavy Ions V
10.00 Plenary talk
P S. Scherer (Mainz) F Instrumentation and Applications V
Compton Scattering off the Nucleon at MAMI
Energies
HK 42
10.30 coffee break 15.30 coffee break
HK36 - Talks - from 11.00 to 12.45 HK43-48 - Talks - from 16.00 to 18.00
11.00 Plenary talk A Theory VII
P J. Wambach (Darmstadt) HK 43
Ciral Symmetry and the Medium Modification
of Hadrons B Nuclear Physics / Spectroscopy VII
HK 45
11.45 Plenary talk
P U. Thoma (JLab) C Theory VIII
Search for Missing Baryon Resonances HK 44
12.15 Plenary talk D Electromagnetic and Hadronic Probes VI
P S. Goriely (Brüssel) HK 46
The Role of Nuclear Physics in providing
Data for Astrophysics E Heavy Ions VI
HK 47
12.45 lunch break
F Instrumentation and Applications VI
HK 48

Nuclear Physics Sectional Programme Overview
8.30
P
9.00
P
9.30
P
10.00
P
11.00
P
11.30
P
12.00
P
Friday, March 15, 2002
MORNING
HK49 - Talks - from 8.30 to 10.30
Plenary talk
M. Düren (HERMES)
New Results from HERMES
Plenary talk
S. Spanier (SLAC)
New Results from the BaBar collaboration
Plenary talk
K. Langanke (Aarhus)
Nuclear quests in astrophysics
Plenary talk
O. Kester (München)
Acceleration of radioactive ion beams at REX-
ISOLDE
10.30 coffee break
HK50 - Talks - from 11.00 to 12.30
Plenary talk
R. Jakob (Wuppertal)
The Advantage of Exclusiveness
Plenary talk
O. Zimmer (München)
Neutron beta decay and the CKM matrix
Plenary talk
G. Neyens (Leuven)
Quadrupole and magnetic moments of
neutron-rich nuclei from projectile fragmentation
12.30 End of Meeting

Nuclear Physics Monday
Sessions
– Invited and Contributed Lectures, Posters –
HK1 Plenary Session
Time: Monday 13:45–15:45 Room: Plenarsaal
Plenary Talk HK 1.1 Mon 13:45 Plenarsaal
Instantons and Confinement in QCD — •Gerard ’t Hooft —
Utrecht University and Spinoza Institute
Quantum Chromodynamics, a theory that describes in great detail
the dynamics of the strong forces among the subatomic particles, is a
non-Abelian gauge theory, and it has a delicate topological structure.
The nature of the forces that keep the quarks permanently confined into
pairs or triplets can be understood in terms of this topology: we find
that Bose-Einstein condensation takes place in the colour-magnetic sector.
The theory allows for a very special kind of transitions, or events,
called ”instantons”. It turns out that these explain the special way in
which the chiral symmetry of the system is manifested, such as the entirely
different mixing angles between the vector particles on the one
hand and the isoscalars on the other.
Plenary Talk HK 1.2 Mon 14:30 Plenarsaal
A Perspective on Nuclear Structure Physics in the Context of
the U.S. Long Range Planning Process — •Richard F. Casten
— Wright Nuclear Structure Laboratory, Yale University, New Haven,
CT 06520-8124, U.S.A.
Nuclear physics in the USis entering a crucial phase in which two major
facilities – CEBAF at Jefferson Laboratory and RHIC at Brookhaven
National Laboratory – are now running and obtaining significant new
results, and in which a third facility, the exotic beam laboratory Rare
Isotope Accelerator (RIA), is being recommended as the highest priority
for major new construction in the current Long Range Planning Pro-
HK2 Theory I
cess. These initiatives reflect the three major pillars on which nuclear
physics research stands, namely, the interactions of quarks and gluons,
the quark-gluon structure of hadronic matter, and of the structure of
nuclei themselves. Each of these has wider ramifications, especially in
regard to astrophysics and the Standard Model. This talk will focus on
the recent Long Range planning effort in the US– both the nature of
the process itself and on the Recommendations resulting from it. It will
then go on to discuss in more specificity the major accomplishments in
nuclear structure in recent years and the exciting prospects for future
discoveries in this field. Especially important in this regard is the discovery
potential inherent in the RIA facility. This work was supported
by U.S. DOE under Grant No. DE-FG02-91ER-40609.
Plenary Talk HK 1.3 Mon 15:15 Plenarsaal
Heavy Ion Physics in the RHIC Era — •Thomas Peitzmann —
Universität Münster, 48149 Münster, Germany
The first year of running of the Relativistic Heavy Ion Collider in
Brookhaven at a beam energy of √ sNN = 130 GeV has brought the study
of strongly interacting matter into a new era and has already provided
a large number of exciting results by the four heavy ion experiments.
Highlights of these early results will be presented and discussed in comparison
with previous results from lower energy heavy ion experiments
and from measurements in pp (p¯p) collisions and with theoretical expectations.
The status of the measurements at the full RHIC energy of
√ sNN = 200 GeV in 2001 and the future prospects will also be discussed.
Time: Monday 16:15–19:00 Room: A
Group Report HK 2.1 Mon 16:15 A
New soft pion theorems for hard reactions — •M.V. Polyakov 1,2 ,
P.V. Pobylitsa 1,2 ,andM.I. Strikman 1,3 — 1 Petersburg Nuclear
Physics Institute, 188350 Gatchina, Russia — 2 Institute for Theoretical
Physics II, Ruhr University Bochum, 44780 Bochum, Germany —
3 Pennsylvania State University, University Park, PA16802,USA
We prove a new soft pion theorem for the near threshold pion production
by a hard electromagnetic probe. This theorem relates various
near threshold pion production amplitudes to the nucleon form factors
at large momentum transfer. The new soft pion theorem exploits the
kinematic domain Q 2 ≫ Λ 3 /mπ (Λ ∼ 1 GeV is a typical hadronic scale,
Q 2 is a virtuality of the incident photon).
The new soft pion theorem is in a good agreement with the SLAC
data for the structure function F p
2 (W, Q 2 ) for W 2 ≤ 1.4 GeV 2 and
9 ≤ Q 2 ≤ 30.7 GeV 2 .
Group Report HK 2.2 Mon 16:45 A
Relativistic chiral SU(3) symmetry, large Nc sum rules and
meson-baryon scattering — •Matthias F.M. Lutz 1 and Evgeni
E. Kolomeitsev 2 — 1 GSI, Planck Str. 1, D-64291 Darmstadt and Institut
für Kernphysik, TU Darmstadt, D-64289 Darmstadt — 2 ECT*,
Villa Tambosi, I-38050 Villazzano (Trento)
The relativistic chiral SU(3) Lagrangian is used to describe kaonnucleon
scattering imposing constraints from the pion-nucleon sector and
the axial-vector coupling constants of the baryon octet states. We solve
the covariant coupled-channel Bethe-Salpeter equation with the interaction
kernel truncated at chiral order Q 3 where we include only those
terms which are leading in the large Nc limit of QCD. The baryon decuplet
states are an important explicit ingredient in our scheme, because
together with the baryon octet states they form the large Nc baryon
ground states of QCD. Part of our technical developments is a minimal
chiral subtraction scheme within dimensional regularization, which leads
to a manifest realization of the covariant chiral counting rules. All SU(3)
symmetry-breaking effects are well controlled by the combined chiral and
large Nc expansion, but still found to play a crucial role in understanding
the empirical data. We achieve an excellent description of the data set
typically up to laboratory momenta of plab � 500 MeV.
Group Report HK 2.3 Mon 17:15 A
Determination of vector meson properties by matching resonance
saturation to a constituent quark model — •Stefan Leupold
— Institut für Theoretische Physik, Universität Giessen, Germany
We calculate the low-energy coefficients of chiral perturbation theory
in two different ways, namely (i) by assuming resonance saturation and
(ii) within a constituent quark model derived as the low energy effective
theory of the instanton model. By matching the expressions of the two
models we determine mass and coupling constants for vector and axialvector
mesons. We recover in this way the KSFR relation as well as
the universality of the vector meson coupling. The latter is found to be
g =2π. For the ρ-meson mass we get mρ = √ 8 πFπ ≈ 826 MeV where
Fπ denotes the pion decay constant.
HK 2.4 Mon 17:45 A
Electromagnetic transition form factors and dilepton decay
rates of nucleon resonances — •Mikhail Krivoruchenko, Christian
Fuchs, Boris Martemyanov, andAmand Faessler —Institut
fuer Theoretische Physik, Universitaet Tuebingen, Auf der Morgenstelle
14, D-72076 Tuebingen, Germany
Relativistic, kinematically complete phenomenological expressions for
the dilepton decay rates of nucleon resonances with arbitrary spin and
parity are derived in terms of the magnetic, electric, and Coulomb tran-

Nuclear Physics Monday
sition form factors. The dilepton decay rates of the nucleon resonances
with masses below 2 GeV are estimated using the extended vector meson
dominance model for the transition form factors. The model provides a
unified description of the photo- and electroproduction data, the vector
meson decays, and the dilepton decays. The constraints on the transition
form factors from the quark counting rules are taken into account.
The parameters of the model are fixed by fitting the available photo- and
electroproduction data and using results of the multichannel partial-wave
analysis of the πN scattering. The vector meson coupling constants of
the magnetic, electric, and Coulomb types are determined. The dilepton
widths and the dilepton spectra from decays of nucleon resonances with
masses below 2 GeV are calculated [1,2]. The results are used to model
the dilepton spectra in proton-proton, proton-deuteron, and heavy-ion
collisions.
[1] M.I. Krivoruchenko, Amand Faessler: Phys.Rev. D 65, 017502 (2002).
[2] M.I. Krivoruchenko, B.V. Martemyanov, Amand Faessler, C. Fuchs:
submitted to Ann.Phys. (N.Y.), nucl-th/0110066.
HK 2.5 Mon 18:00 A
Color-Flavor Unlocking and Phase Structure of Strongly Interacting
Matter — •Michael Buballa 1,2 , Jǐri Hǒsek 3 ,andMicaela
Oertel 4 — 1 IKP, TU Darmstadt, Darmstadt, Germany — 2 GSI, Darmstadt,
Germany — 3 Dept. Theor. Phys., ˇ Reˇz (Prague), Czech Republik
— 4 IPN-Lyon, Villeurbanne, France
At low temperatures and high densities strongly interacting matter
is expected to be a color superconductor. One can distinguish at least
two different superconducting phases, the two-flavor color superconductor
(2SC) and the so-called color-flavor locked (CFL) phase, which incorporates
three quark flavors. We calculate the phase diagram within a
3-flavor NJL-type quark model with realistic quark masses. The model
exhibits spontaneous chiral symmetry breaking as well as diquark condensation
in the 2SC phase and in the CFL phase. We investigate the colorflavor
unlocking phase transition, taking into account self-consistently
calculated effective quark masses. We find that it is mainly triggered by
a first-order phase transition with respect to the strange quark mass. It
takes place at a relatively high value of the chemical potential such that
we find a large region where the 2SC phase is the most favored state.
We also investigate the possible existence of more “exotic” phases, like
unisotropic condensates. It turns out that the relevance of such condensates
is strongly parameter dependent. This leaves room for surprises.
HK 2.6 Mon 18:15 A
Dispersion relations in real and virtual Compton scattering
— •Marc Vanderhaeghen 1 , Dieter Drechsel 1 , Michael
Gorchtein 1 , Andreas Metz 2 , and Barbara Pasquini 3 —
1 Johannes Gutenberg University Mainz — 2 Vrije Universteit Amsterdam
— 3 ECT* Trento
A unified presentation is given of the use of dispersion relations in
the real and virtual Compton scattering processes off the nucleon. It
is reviewed how for Compton scattering, dispersion relations establish a
connection between low energy nucleon structure quantities such as its
HK3 Nuclear Physics / Spectroscopy I
polarizabilities on the one hand and the nucleon excitation spectrum on
the other hand. Various types of dispersion relations are subsequently
discussed for the real Compton scattering (RCS) process as a tool to extract
nucleon polarizabilities from RCSdata and the present knowledge
on the nucleon polarizabilities obtained in this way is reviewed [1]. Subsequently,
we present the extension of the dispersion relation formalism
to the virtual Compton scattering (VCS) process as a tool to extract
generalized polarizabilities of the nucleon [2]. The information on generalized
nucleon polarizabilities as extracted in this way from recent VCS
experiments is reviewed in particular in view of new JLab VCSdata for
photon virtualities Q 2 in the range 1 - 2 GeV 2 .
[1] D. Drechsel, B. Pasquini and M. Vanderhaeghen, in preparation
[2] B. Pasquini et al., Eur.Phys.J.A 11 (2001) 185.
HK 2.7 Mon 18:30 A
Thermodynamics of the chiral condensate — •Thomas
M. Schwarz, Norbert Kaiser, and Wolfram Weise —
Physik-Department, Technische Universität München.
We study the temperature and density dependence of the scalar quark
condensate 〈¯qq〉 using effective field theory methods. Nucleons interact
via perturbative chiral pion exchange and scalar plus vector four-point
interactions. The latter are treated in relativistic mean field approximation
giving rise to an effective nucleon mass M ∗ and an effective chemical
potential µ ∗ . Contributions from pion fluctuations at two-loop level are
included in the self consistency equations for M ∗ and µ ∗ . The strengths
of the contact interactions are adjusted to the empirical nuclear matter
saturation point and compressibility κ. From this we predict an effective
nucleon mass of M ∗ (ρ0) � 0.8M. At a temperature T � 17 MeV a
liquid-gas phase transition is observed. The dependence of the equation
of state P (T,µ,mπ) on the pion mass allows to calculate deviations from
the leading linear decrease in density of the quark condensate. We find
that these are small below normal nuclear matter density, but substantial
at higher densities. In a further step we include three-loop contributions
from 2π-exchange.
Supported in part by BMBF and GSI.
HK 2.8 Mon 18:45 A
Renormalon Model of Twist-4 Corrections to Meson Wave
Functions — •Stefan Gottwald — Institut für Theoretische Physik,
Universität Regensburg, D-93040 Regensburg, Germany
In this talk I present a renormalon-inspired model of twist-4 power
corrections to the light-cone wave functions of the pion and the rhomeson,
and compare it to the results obtained using the conformal wave
expansion.
This renormalon approach allows one to get some insight in the convergence
properties of the conformal expansion and the basic result is that
global features of the higher-twist wave functions calculated in the renormalon
approach turn out to be surprisingly close to simple models based
on the truncated conformal expansion. At the same time, the renormalon
calculation indicates a “soft” divergence of the conformal expansion close
to the kinematic boundaries.
Time: Monday 16:15–19:00 Room: B
Group Report HK 3.1 Mon 16:15 B
New interpretation of the O(6) limit of the interacting boson
model. — •J. Jolie 1 , P. von Brentano 1 , V. Werner 1 ,andR.F.
Casten 2 — 1 Institut fuer Kernphysik, Universitaet zu Koeln — 2 Yale
University, New Haven, USA
It is shown that the O(6) limit of the IBM, can be interpreted as a
critical point of a phase transition inbetween oblate and prolate rotational
nuclei[1]. This quantum phase transition relates to the shape of
the nucleus and can be described exactly for any number of interacting
bosons N at the critical point. It will be shown that an important tool
to theoretically study such finite-N quantum phase transitions is provided
by the determination of the wavefunction entropy [2]. Besides this
also other signatures of phase transitional character are discussed [3]. [1]
J.Jolie, R.F. Casten, P. von Brentano, V. Werner, Phys. Rev. Lett.87
(2001) 162501. [2] P. Cejnar, J.Jolie Phys. Rev. E 61 (2000) 6237. [3] V.
Werner, P. von Brentano, R.F. Casten, J. Jolie, acc. for publ. in Phys.
Lett. B. Work supported by DFG under project No Br 799/10-1 of US-
DOE under grant N0 DE-FG02-91ER40609 and NATO under grant No
SA 5-2-05 (CRG 950668).
Group Report HK 3.2 Mon 16:45 B
Decay properties of N� nuclei: A status report from the ISOL
facility of GSI — •J. Döring for the GSI-ISOL collaboration — GSI,
Darmstadt, Germany
Nuclei with N�Z between the double shell closures 56 Ni and 100 Snare
of great interest due to their special nuclear-structure features, including
shape coexistence, the influence of the proton drip-line, tests of the Standard
Model of Weak Interaction by means of precision data on superallowed
0 + →0 + β-decays, and the relevance to the astrophysical rp process.
These motivations form the basis of the research program pursued at the
ISOL facility of GSI Darmstadt. After describing the fusion-evaporation
reactions, used for producing the neutron-deficient isotopes of interest,
and the detectors for decay measurements, we present examples of recent
experiments, i.e. (i) the β-delayed proton emission from 57 Zn (T1/2

Nuclear Physics Monday
=38±4 ms)to 56 Ni [1], (ii) the accurate determination of the branching
ratio for the 58 Cu(1 + )→ 58 Ni(0 + ) β transition (81.2±0.5 %), which serves
as a calibration in deducing the Gamow-Teller strength distribution from
high-resolution 58 Ni( 3 He,t) 58 Cu data [2], and (iii) an attempt to reach a
precision of 4 parts in 10 4 for the half-life of the superallowed 0 + →0 + βdecay
of 62 Ga by accumulating about 2×10 6 positron events. Finally, an
outlook will be given, including in particular the novel technique of extracting
short-lived tin isotopes as singly charged sulfide molecules from
the ion source, which opens exciting perspectives for future β-decay experiments
on 102 Sn and 100 Sn.
[1] A. Jokinen et al., submitted to Eur. Phys. J. A.
[2] Z. Janas et al., Eur. Phys. J. A 12, 143 (2001).
Group Report HK 3.3 Mon 17:15 B
Investigation of the level scheme of 144 Gd and lifetimes of the
triaxial quadrupole band — •R.M. Lieder 1 , W. Gast 1 , H.M.
Jäger 1 , L. Mihailescu 1 , A.A. Pasternak 2 , E.O. Podsvirova 2 , D.
Bazzacco 3 , R. Menegazzo 3 , S. Lunardi 3 , C. Rossi Alvarez 3 , G.
de Angelis 4 , E. Farnea 4 , A. Gadea 4 , D.R. Napoli 4 , T. Rza¸ca-
Urban 5 , W. Urban 5 ,andA. Dewald 6 — 1 IKP, FZ Jülich, D-52425
Jülich — 2 A.F. Joffe PTI, RU-194021 St. Petersburg — 3 INFN, Sezione
di Padova, I-35131 Padova — 4 INFN, LNL, I-35020 Legnaro — 5 IEP,
Univ. Warsaw, PL-00-681 Warsaw — 6 IKP, Univ. Köln, D-50937 Köln
High-spin states in 144 Gd have been excited in the 100 Mo( 48 Ti,4n) reaction
at 215 MeV and studied with EUROBALL at the LNL, Italy.
Several dipole and stretched E2 cascades have been observed. The study
of lifetimes of the E2 cascades is of importance for the understanding of
the transition from highly to superdeformed states between the A ≈ 130
and A ≈ 150 regions. This transition is expected to occur via triaxial
shapes. The strongest E2 cascade in 144 Gd is considered to have a
configuration involving rotation aligned h11/2 protons as well as rotation
aligned h11/2 neutron holes and h9/2 neutrons resulting in a well
deformed triaxial nuclear shape. More information on the configuration
of this band was obtained in a DSA study with GASP at the LNL, Italy
using the 114 Cd( 36 S,6n) reaction at E = 182 MeV. The target consisted of
a 1.2 mg/cm 2 114 Cd foil backed by a 1.2 mg/cm 2 Ta and a 55 mg/cm 2 Bi
layer. Because most of the γ-lines of interest are contaminated by background
lines special techniques have been developed for the analysis. The
results of the lifetime analysis support the proposed interpretation.
HK 3.4 Mon 17:45 B
New methods for measuring nuclear skins — •A. Krasznahorkay
1,2 , H. Akimune 3 , A.M. van den Berg 2 , N. Blasi 4 , S.
Brandenburg 2 , M. Csatlós 1 , H. Fujimura 3 , M. Fujiwara 3,5 , J.
Gulyás 1 , M. Hagemann 6 , K. Hara 3 , M. N. Harakeh 2 , M. Hunyadi
2 , M. de Huu 2 , F. Ihara 3 , T. Ishikawa 7 , Z. Máté 1 , D. Sohler 1 ,
S.Y. van der Werf 2 ,andL. Zolnai 1 — 1 ATOMKI, Debrecen, Hungary
— 2 KVI, Groningen, The Netherlands — 3 RCNP, Osaka, Japan —
4 INFN, Milano, Italy — 5 JAERI, Tokai, Japan — 6 Univ. Gent, Belgium
— 7 Univ. Kyoto, Japan
The neutron-skin thickness of 208 Pb and 114,124 Sn has been investigated
in order to constrain the symmetry energy term of the nuclear
energy functional. The precise knowledge of the symmetry energy is essential
not only for describing the structure of neutron-rich nuclei, but
also for describing the properties of the neutron-rich matter in nuclear
astrophysics. We have used inelastic alpha scattering to excite the giant
dipole resonance (GDR). The cross section of this process depends
strongly on ∆Rnp/R, the radial difference of the neutron and proton
densities [1]. We have also used the excitation of the spin-dipole resonance
(SDR) to measure the neutron-skin thickness since the total L=1
strength of the SDR is sensitive to it [2]. Recently new experiments were
carried out at the KVI using 196 MeV α and 177 MeV 3 He beams from
the AGOR superconducting cyclotron. A critical test of both the GDR
and SDR methods will be discussed.
[1] A. Krasznahorkay et al., Phys. Rev. Lett. 66, 1287 (1991)
[2] A. Krasznahorkay et al., Phys. Rev. Lett. 82, 3216 (1999).
HK 3.5 Mon 18:00 B
Nuclear matter distribution of light neutron rich He nuclei from
elastic proton scattering at large momentum transfer — •Oleg
Kisselev for the S174 collaboration — Gesellschaft für Schwerionenforschung
mbH, Planckstrasse 1, D-64291 Darmstadt
Elastic proton scattering from the 6 He and 8 He halo nuclei was investigated
in inverse kinematics at energies around 700 MeV/u at GSI Darmstadt.
The experimental setup consisted of a liquid hydrogen target, a
forward spectrometer for tracking and identifying the projectile nuclei,
and a tracking system for the detection of the recoil protons. This setup
allowed for a high precision and low background measurement. The aim
of the experiment was to deduce the differential p 6 He and p 8 He cross sections
for the region of high momentum transfer close to the expected first
diffraction minimum. This new information together with the data obtained
at small momentum transfer provides additional knowledge about
the structure of the alpha-like core in 6 He and 8 He. The present status
of the data analysis and first results will be presented.
HK 3.6 Mon 18:15 B
Alpha decay of 114 Ba — •C. Mazzocchi for the GSI-ISOL collaboration
— GSI, Darmstadt, Germany
Alpha decay is a rich source of nuclear-structure information, offering
insight into properties such as ground-state binding energies and spectroscopic
factors for α-particle emission, in particular for neutron-deficient
isotopes beyond the doubly-magic nucleus 100 Sn. Based on this motiva-
tion we searched for the α decay of 114 Ba (T1/2 = 430 +300
−150 ms [1]). The
114 Ba nuclei were produced through the 58 Ni( 58 Ni,2n) reaction, separated
from other reaction products as a mass-separated and chemically clean
beam of 114 Ba 19 F + ions by means of the ISOL facility of GSI Darmstadt,
implanted into a stopper foil, and studied by using silicon-detector telescopes
for decay spectroscopy.
We measured for the first time the α-particle energy (3410±40 keV)
of 114 Ba, the half-life (160 +290
−60 ms) of its daughter nucleus 110 Xe, and the
α-branching ratios and widths for these two isotopes and for the granddaughter
nucleus 106 Te [2]. The increase of the α-particle energies along
the α-decay chain from 114 Ba to 102 Sn is a clear signature of the double
shell-closure occurring at 100 Sn. The experimental values obtained for
the α-decay Q values of these three isotopes as well as for the Q value
for 12 C emission from 114 Ba (19000±40 keV) will be dicussed in comparison
with theoretical predictions. In view of the large uncertainties of
the reduced α-widths, no firm conclusions can be drawn concerning the
occurrence of superallowed α decay.
[1] Z. Janas et al., Nucl. Phys. A 627, 119 (1997).
[2] C. Mazzocchi et al., submitted to Phys. Lett. B.
HK 3.7 Mon 18:30 B
Simple Parametrization of neutron separation energies in terms
of the neutron to proton ratio N/Z ∗ — •K. Vogt, T. Hartmann,
and A. Zilges — Institut für Kernphysik, Technische Universität Darmstadt,
D-64289 Darmstadt, Germany
It is shown that single- and two-nucleon separation energies can be
parametrized in a new way using the neutron to proton ratio N/Z and
the mass number A. Very simple empirical formulas have been achieved
using a least squares fit to all available experimental data [1]. It is demonstrated
that the observed N/Z dependence can be derived from the Fermi
Gas model. For an estimate of the usefulness of these formulas, the resulting
neutron separation energies are compared to results from several
mass formulas currently in use [2,3]. As an outlook, possible practical
applications are discussed.
∗ supported by the DFG (contract Zi 510/2-1 and FOR 272/2-1).
[1]K.Vogt,T.Hartmann,A.Zilges,Phys.Lett.B517 (2001)
[2] P. Möller, J. R. Nix, W. D. Myers, and W. J. Swiatecki, At. Data
Nucl. Data Tables, 59, 185 (1995)
[3] F.Tondeur,S.Goriely,J.M.Pearson,andM.Onsi,Phys. Rev. C
62, 024308 (2000)
HK 3.8 Mon 18:45 B
Calculated groundstate properties of Er-isotopes in comparison
with messured 2 + -states — •Thomas Cornelius 1 , M. Bender 2 ,
T. Bürvenich 1 , A. Sulaksono 1 , P. Fleischer 3 , S . S chramm 4 ,
J. A. Maruhn 1 , P.–G. Reinhard 3 , J. H. Hamilton 5 , and W.
Greiner 1 — 1 Institut für Theoretische Physik, Universität Frankfurt am
Main — 2 Service de Physique Nucléaire Théorique, Université Librede
Bruxelles — 3 Institut für Theoretische Physik II, Universität Erlangen-
Nürnberg — 4 Nuclear Theory Group, Argonne National Laboratory —
5 Department of Physics, Vanderbilt University, Nashville
Self-consistent mean-field models are nowadays well developed and provide
a pertinent picture of nuclear properties throughout the whole mass
table. We consider two different models, the Skyrme-Hartree-Fock approach
(SHF) and the relativistic mean-field model (RMF). In our former
investigations deformed calculations appear to be important for some observables
like the 2-proton-shell-gap [1].
In our talk we want to show a possible correlation of the lowest, exper-

Nuclear Physics Monday
imental measured 2 + -state for Er-isotopes and their calculated deformed
groundstate properties. The investigation in this region is of special interest
since the measured data do not show the results that are naivly
expected.
HK4 Nuclear and Particle Astrophysics I
Supported by the BMBF, GSI, DFG.
[1] M. Bender, T. Cornelius, G. A. Lalazissis, J. A. Maruhn, W.
Nazarewicz und P.–G. Reinhard , nucl-th/0110057 (2001), accepted for
publication in Eur. Phys. J. A
Time: Monday 16:15–19:00 Room: C
Group Report HK 4.1 Mon 16:15 C
The Physics of the Knee in the Cosmic-Ray Spectrum – Recent
Results from KASCADE – — •Karl-Heinz Kampert for
the KASCADE collaboration — Institut für Experimentelle Kernphysik,
University of Karlsruhe and Forschungzzentrum Karlsruhe
An update on measurements of cosmic rays in the energy range around
10 15 eV is presented. Emphasis is placed on recent KASCADE data and
on progress in air shower simulations using the CORSIKA package. High
energy hadrons observed in the KASCADE calorimeter exhibit a distinct
sensitivity to details in the modelling of high-energy hadronic interactions,
particularly to the inelastic p-Air cross section and to diffractive
dissociation. Thus, the experimental data can be used to constrain models
employed in EASsimulations. Electron and muon shower sizes, on
the other hand, are well suited to extract the energy and mass of the
primary particles. Applying unfolding methods to their size spectra and
adopting a model of high energy hadronic interactions, energy distributions
of 4 mass groups are reconstructed in the energy range between 10 15
and 10 17 eV. The preliminary energy spectra show a knee-like structure
in each of these distributions. Their position suggests a scaling according
to the rigidity of the primary particle. Astrophysical implications of this
important finding will be discussed.
Group Report HK 4.2 Mon 16:45 C
KATRIN a next generation neutrino mass experiment —
•Jochen Bonn for the KATRIN collaboration — B: Institut für
Physik Universität Mainz
Neutrino masses are of crucial importance for nuclear and particle
physics as well as for cosmology. Our present knowledge is based on
neutrino oscillation experiments and on the investigation of weak decays.
The convincing evidence for neutrino oscillations found in the detection
of solar and atmospheric neutrinos are a clear indication for differences
in the squares of the neutrino masses but they do not allow to determine
the masses themselves. To set the mass scale, direct mass measurements
like e.g. the investigation of tritium β-decay are needed. The sensitivity
limit of the presently running experiments in Mainz and Troitsk of
about 2 eV/c 2 are not sufficient to distinguish between alternative theoretical
models asking for very light neutrinos or degenerated neutrinos
with cosmologically relevant masses up to about 1 eV/c 2 .
The new KArlsruhe TRItium Neutrino mass experiment, KATRIN is
presently designed and experiments in preparation of KATRIN are carried
out. The sensitivity limit of KATRIN shall be in the sub eV range.
The results of the present neutrino mass experiments will be briefly reported
and the status of KATRIN will be discussed.
Experiments in preparation of KATRIN are sponsored by BMBF under
contract Nr. 05CK1UM1/5 and 05CK1VK1/7.
Group Report HK 4.3 Mon 17:15 C
A new precision measurement of the electric dipole moment
of the neutron — •Reinhold Henneck for the SUNS colaboration
collaboration — Paul-Scherrer-Institut, CH-5232 Villigen, Schweiz
At PSI we are presently setting up a new source for ultracold neutrons
(UCN) which will deliver UCN densities in excess of 1000 UCN/cm 3 .This
improvement of about 2 orders of magnitude over existing facilities will
open new prospects for studies of fundamental properties of the neutron
and its decay. As a first experiment we intend to improve the sensitivity
in the measurement of the neutron electric dipole moment (EDM) to
about 5 · 10 −28 e·cm. At this level Supersymmetry models predict a finite
EDM value. The EDM spectrometer employs the conventional Ramsey
method, but makes use of a system of 8 HV chambers and 5 chambers
without HV, which will reduce the influence of systematic effects due to
magnetic problems and leakage currents considerably.We shall discuss the
principle of the experiment, the expected statistical uncertainty, systematic
effects as well as details of the most important parts. In particular we
shall focus on the problems which are connected with the magnetic field
and which are being investigated in a separate Magnetic Test Experiment
now.
HK 4.4 Mon 17:45 C
Final results of the KARMEN experiment on the search for
¯νµ → ¯νe oscillations — •Markus Steidl for the KARMEN collaboration
— Forschungszentrum Karlsruhe, Institut für Kernphysik
The final results from the KARMEN2 experiment in its search for
¯νµ → ¯νe oscillation are presented. The KARMEN2 experiment has been
performed from 1997 until 2001 at the spallation neutron source ISIS of
the Rutherford Laboratorium (UK). Beamstop Neutrinos νe,νµ und ¯νµ
with energies up to 52 MeV from the π + –µ + decay chain are used for the
search of neutrino oscillations. The very low ISIS beam contamination
with ¯νe leads to a high sensitivity in the appearance channel ¯νµ → ¯νe .
Events induced by ¯νe are detected in the 56 t liquid scintillator KAR-
MEN detector via the p (¯νe ,e + ) n reaction. As the KARMEN2 search
yields clearly no hints for the presence of an oscillation signal, stringent
limits on the oscillation parameters sin2 (2θ)and∆m2are set. These final
KARMEN2 results are then combined with the final results of the LSND
experiment, which claims observed evidence in this oscillation channel.
The combined analysis allows the investigation of the statistical compatibility
of the two experiments and the construction of a combined
confidence interval on the allowed oscillation parameters sin2 (2θ) and
∆m2 .
HK 4.5 Mon 18:00 C
Neutrino-nucleon scattering rate in the relativistic random
phase approximation — •Lysiane Mornas1 and Armando Pérez2 — 1Departamento de Física, Universidad de Oviedo, E-33007 Oviedo
(Asturias), Spain — 2Departamento de Física Teórica, Universidad de
Valencia, E-46100 Burjassot (Valencia), Spain
We present a calculation of the neutrino-nucleon scattering cross section
which takes into account the nuclear correlations in the relativistic
random phase approximation. Our approach is based on a quantum
hadrodynamics model with exchange of σ, ω, π, ρ and δ mesons. In
view of applications to neutrino transport in the final stages of supernova
explosion and protoneutron star cooling, we study the evolution
of the neutrino mean free path as a function of density, proton-neutron
asymmetry and temperature.
Special attention was paid to the issues of renormalization of the Dirac
sea, residual interactions in the tensor channel, coupling to the delta meson
and meson mixing. In contrast with the results of other authors
[1,2], it is found that RPA corrections with respect to the mean field
approximation amount to only 10% to 15% at high density [3].
[1]S.Reddy,M.Prakash,J.M.LattimerandJ.Pons,Phys. Rev. C59
(1999) 2888.
[2]S.YamadaandH.Toki,Phys.Rev.C61 (2000) 015803.
[3] L. Mornas and A. Pérez, nucl-th/0106058 subm. to Eur. Phys. J. A
HK 4.6 Mon 18:15 C
Results of the 2001 measurements of the Mainz neutrino
mass experiment — •Christine Kraus, Jochen Bonn, Beate
Bornschein, Lutz Bornschein, Fernando Conda, Björn
Flatt, Beatrix Müller, Ernst Wilhelm Otten, Jean-Pierre
Schall, Thomas Thümmler, and Christian Weinheimer —
Institut für Physik, Johannes Gutenberg Universität Mainz, 55099
Mainz
The Mainz neutrino mass experiment investigates the endpoint region
of the tritium β decay spectrum to determine the mass of the electron antineutrino.
The principle of the Mainz spectrometer, Magnetic Adiabatic
Collimation followed by a retarding Electrostatic Filter (MAC-E-Filter),
combines both a high resolution and a large acceptance. After an optimal
preparation of the apparatus, ≈ 2 month of data were taken. The data
fit good together with the results of 98/99. The results of the analysis

Nuclear Physics Monday
will be presented for the data of 2001 in combination with the 98/99
measurements.
Work sponsored by BMBF: FKZ 06Mz866I/5.
HK 4.7 Mon 18:30 C
Superfluidity in Nuclear Matter — •Jan Kuckei and Herbert
Müther — Institut f¨r Theoretische Physik, Universität Tübingen
Superfluidity plays an important role in the physics of nuclear matter.
It is paramount for several properties of neutron stars, such as their
cooling mechanism and certain dynamical features.
We present calculations of the superfluid pairing gap for isospin T=0
and isospin T=1 pairing. The sensitivity of the pairing correlations on
the nucleon-nucleon interaction as well as the determination of the singleparticle
spectra are discussed in detail. For asymmetric nuclear matter
HK5 Electromagnetic and Hadronic Probes I
we observe proton and neutron pariring with a total momentum different
from zero.
HK 4.8 Mon 18:45 C
COBRA - Search for Double Beta Decays using CdTe Detectors
— •Henning Kiel 1 , Kai Zuber 1 , Yorck Ramachers 2 ,andDaniel
Muenstermann 1 — 1 Lehrstuhl fuer Experimentelle Physik IV, Universitaet
Dortmund — 2 Nuclear and Particle Physics Laboratory, University
of Oxford
The physics potential of CdTe semiconductor detectors for double beta
and rare decay searches is explored.
The principle layout of the planned COBRA experiment is presented.
Finally first results of measurements done with the current test setup
and the feasibility of the experiment are shown.
Time: Monday 16:15–19:00 Room: D
Group Report HK 5.1 Mon 16:15 D
Study of the meson production in the 1 GeV/c 2 mass range —
•Pawe̷l Moskal for the COSY-11 collaboration — Institut für Kernphysik,
Forschungszentrum Jülich, Germany — Nuclear Physics Institute,
Jagellonian University, Cracow, Poland
A study of the 1 GeV/c 2 mass range is motivated by the continuing discussion
on the nature of the scalar resonances f0(980) and a0(980), which
have been interpreted as exotic four quark objects[1], conventional qq
states[2] or molecular like KK bound state[3]. Utilizing the missing mass
technique we investigated the pp → ppX and pp → ppK + X − reactions
by scanning beam energies in the range permitting to create a mass close
to that of the f0 and a0 resonances. Experiments have been carried out
at the COSY–11 facility[4] installed at the cooler synchrotron COSY[5].
In the presentation the notion of the close to threshold total cross section
for broad resonances will be introduced, and a trial of its estimation
in case of f0(980) and a0(980) mesons excitations will be presented and
critically discussed.
[1] R. Jaffe, Phys. Rev. D15(1997) 267.
[2] D. Morgan, M. R. Pennington, Phys. Rev. D48(1993) 1185.
[3]J.Weinstein,N.Isgur,Phys.Rev.D41(1990) 2236.
[4] S. Brauksiepe et al., Nucl. Instr. & Meth. A 376 (1996) 397.
[5] D. Prasuhn et al., Nucl. Instr. & Meth. A 441 (2000) 167.
Group Report HK 5.2 Mon 16:45 D
Recent results from the EDDA experiment at COSY — •Oleg
Eyser for the EDDA collaboration — Institut für Experimentalphysik,
Universität Hamburg
The EDDA experiment ist dedicated to the measurement of excitation
functions for various observables in elastic proton proton scattering. The
detector consists of two concentric double layers of scintillators that cover
over 80% of the solid angle for momenta ranging from 0.8 to 3.3 GeV/c.
EDDA, an internal experiment at COSY, makes use of a hydrogen
atomic beam target and the recirculating COSY proton beam. While
the polarization in COSY is limited to the y-direction normal to the
accelerator plane, the polarization of the target protons can be aligned
arbitralily in space, namely along the x, y, and z axis. A cyclic combination
of different polarizations makes three spin correlation coefficients
accessible: ASS, ANN,andASL.
After completion of the excitation functions for the analyzing power
AN ([1]), several energies have been scanned with high accuracy. Recent
results for the three spin correlation coefficients will be presented in this
talk and will be compared to existing und accordingly updated phase
shift anlyses.
This work is supported by the BMBF and the FZ Jülich.
[1] M. Altmeier et al., Phys. Rev. Lett. 85, 1819 (2000)
HK 5.3 Mon 17:15 D
LIFETIME OF THE Λ–HYPERON BOUND IN HEAVY HY-
PERNUCLEI — SUMMARY OF THE COSY–13 RESULTS
— •Pawel Kulessa for the COSY–13 collaboration — Institut für
Kernphysik, Forschungszentrum Jülich, Germany — H. Niewodniczański
Institute of Nuclear Physics, Poland
The nonmesonic decay of Λ–hyperons has been investigated by the
observation of delayed fission of heavy hypernuclei produced in pro-
ton – Au, Bi and U collisions at COSY-Jülich. The lifetime of heavy
hypernuclei obtained by the COSY–13 collaboration τΛ = (138 ±
6(stat.) ± 17(syst.)) ps for p+U, (161±7(stat.)±14(syst.)) ps for p+Bi
and (130±13(stat.)±15(syst.)) ps for p+Au are the most accurate result
for proton and antiproton induced collisions on these targets so far. This
result together gives an average value for the lifetime of heavy hypernuclei
with masses A>180: τΛ = (145 ± 11)ps. By comparing the lifetimes
of light and heavy hypernuclei we found – on the confidence level of 0.98
– a violation of the phenomenological ∆I=1/2 rule known from the the
weak mesonic decays of strange particles.
HK 5.4 Mon 17:30 D
First results of π 0 − η mixing angle measurement — P.
Hawranek 1 , H. Machner 2 , •P. Hawranek 1 , and H. Machner
2 for the GEM collaboration and the GEM collaboration —
1 Jagellonian University, Cracow, Poland — 2 Institut für Kernphysik,
Forschungszentrum Jülich, Jülich, Germany
Isospin symmetry may be broken - except for trivia reasons like
Coulomb effects - via π 0 − η mixing. The mixing angle is related to
the difference of the squared up and down quark masses. In order to
measure this mixing angle we have studied the ratio of the two isospin
related reactions pd → 3 Heπ 0 and pd → 3 Hπ + close to the η-threshold.
A simple model Ref. 1 predicts the effect to be largest at large momentum
transfer. The reactions have been measured at five different
momenta in the vicinity of the η-threshold. Both recoils were measured
simultaneously with an unusual magnetic spectrograph having two focal
planes. The experiment will be presented as well as first data.
[1] A. Magiera and H. Machner, Nucl. Phys. A674 (2000) 515
HK 5.5 Mon 17:45 D
Energy dependence of the Λ/Σ0 cross section ratio — •Piotr
Kowina for the COSY–11 collaboration — Research Centre Jülich, Germany
— University of Silesia, Katowice, Poland
Measurements of the near threshold Λ and Σ0 production via the
pp → pK + Λ/Σ0 reaction at COSY–11 [1] showed a strong discrepancy
compared to high energy data [2]. Close to threshold at excess energies
ɛ ≤ 13 MeV the Λ/Σ0 cross section ratio has been determined to be 28 +6
−9
which exceeds the value at high excess energies (ɛ ≥ 150 MeV) of about
2.5 by an order of magnitude. In order to get a further understanding
additional data have been taken between 13 MeV and 150 MeV excess
energy. The final analysis will be presented and will be discussed in
view of different interpretations. Calculations within a meson exchange
model [3] taking into account pion and kaon exchange reproduce the
measured ratio by a destructive interference of π and K exchange amplitudes.
Within a factor of two also other models [4,5] describe the data
by including heavier exchange mesons and/or nucleon resonances.
[1] S. Sewerin, G. Schepers et al., Phys. Rev. Lett. 83(1999) 682.
[2] V. Flaminio et al., Compilation of Cross sections,
CERN HERA 84 01 (1984).
[3] A. Gasparian et al., Phys. Lett.B 480 (2000) 273.
[4] A. Sibirtsev et al., e-Print Archive nucl-th/0004022 (2000).
[5] R. Shyam, G. Penner, U. Mosel, Phys.Rev.C 63 (2001) 022202.

Nuclear Physics Monday
HK 5.6 Mon 18:00 D
Erste Messung der Analysierstärke Ay in der Reaktion
�pp → ppη am Experiment COSY-11 — •Peter Winter für die
COSY-11-Kollaboration — Institut für Kernphysik, Forschungszentrum
Jülich, 52425 Jülich
Unter Verwendung der am Detektorsystem COSY-11 gemessenen Daten
in der Reaktion �pp → ppη werden erste Ergebnisse der Analysierstärke
bei einem Strahlimpuls pStrahl =2.096 GeV/c – entsprechend
einer Überschußenergie von Q = 40 MeV – vorgestellt [1]. Eine Selektion
der ppη-Endzustände erfolgt mittels kinematisch vollständiger Rekonstruktion
dieses Drei-Teilchen-Systems. Die Bestimmung der relativen
Luminosität beider Spineinstellungen beruht auf der Messung der
elastischen Proton-Proton-Streuung. Die zeitlich gemittelte Strahlpolarisation
wird durch simultane Messung der elastischen pp-Streuung am
EDDA-Experiment [2] bestimmt. Eine Extraktion einzelner Interferenzterme
von Partialwellenamplituden wird durchgeführt und ermöglicht
einen Vergleich mit theoretischen Vorhersagen.
[1] P. Winter, Erste Messung der Analysierstärke Ay in der Reaktion
�pp → ppη am Experiment COSY-11, Diplomarbeit, Rheinische
Friedrich-Wilhelms-Universität Bonn, 2001.
[2] M. Altmeier et al., Phys. Rev. Lett., 85 (2000) 1819 und F. Bauer,
private Mitteilung.
HK 5.7 Mon 18:15 D
Two Kaon Production at the φ - Meson Threshold with the
MOMO-Experiment at COSY — •R. Jahn 1 , F. Bellemann 1 ,
A. Berg 1 , J. Bisplinghoff 1 , G. Bohlscheid 1 , J. Ernst 1 , F. Hinterberger
1 , R. Ibald 1 , L. Jarczyk 2 , R. Joosten 1 , A. Kozela 3 ,
H. Machner 4 , A. Magiera 2 , R. Maschuw 1 , T. Mayer-Kuckuk 1 ,
G. Mertler 1 , J. Munkel 1 , P.v. Rossen 4 , H. Schnitker 1 , J.
Smyrski 2 , A. Strzalkowski 2 ,andR. Tölle 4 for the MOMO collaboration
— 1 Institut für Strahlen- und Kernphysik, Universität Bonn
— 2 Institute of Physics, Jagellonian University Cracow, Poland —
3 Institute of Nuclear Physics, Cracow, Poland — 4 Institut für Kernphysik,
Forschungszentrum Jülich
The reaction pd → 3 HeK + K − was measured kinematically complete at
the COSY synchroton at beam momenta near 2.6 GeV/c corresponding
to c.m. energies above the K + K − threshold of 35 MeV, 40 MeV and 56
MeV. In total, some 6000 kaon pairs could be uniquely identified. The
KK mass spectra are consistent with phase space topped by a clear signal
of the φ meson, even at 35 MeV, which corresponds to just 2.8 MeV
avbove the φ threshold. In contrast to the MOMO two pion production
data measured with the reaction pd → 3 Heπ + π − (Phys. Rev. C60
(1999) 061002) the two kaon angular distributions indicate pure s-wave
production. The obtained cross sections, ranging into the sub-nanobarn
domain, will be presented and discussed.
Supported by the BMBF.
HK 5.8 Mon 18:30 D
Hyperon Production in the Reaction Channel pp → K 0 Σ + p at
COSY-TOF ∗ — •M. Wagner, W. Eyrich, M. Fritsch, F. Stinzing,
W. Schroeder und S.Wirthfür die COSY-TOF-Kollaboration
— Physikalisches Institut, Universität Erlangen-Nürnberg
HK6 Heavy Ions I
In the framework of the exclusive hyperon measurement program in
proton-proton collisions at the COSY-TOF experiment the reaction channel
pp → K 0 Σ + p has been measured at three beam momenta in the
threshold region: 2.85 GeV/c, 2.95 GeV/c and 3.2 GeV/c. The combination
of the complex start detector system, which is designed and
optimized for the reconstruction of hyperon reactions, and the stop detector
arrangement ensure full phase space coverage.
The data of the lowest beam momentum are based on a beam time in
1998 and have been taken using a short version of the stop detector. The
beam momenta of 2.95 GeV/c and 3.2 GeV/c have been measured with
an extended stop detector setup including both the barrel and the ring
hodoscope in the endcap especially improving the efficiency for the Σ +
channel.
In the first part of the talk analysis methods - in particular the background
suppression - will be presented. In the second part for the first
time in the threshold region differential data including Dalitz analysis
are presented. ∗ supported by BMBF and FZ Jülich
HK 5.9 Mon 18:45 D
The Deuteron Break-up Experiment at ANKE/COSY — •S.
Dymov 1,2 , R. Engels 3 , P. Jansen 4 , A. Kacharava 5 , F. Klehr 4 ,
H. Kleines 6 , V. Komarov 2 , V. Koptev 7 , P. Kravtsov 7 , A. Kulikov
2 , V. Kurbatov 2 , B. Lorentz 1 , G. Macharashvili 2 , M.
Mikirtytchiants 1,7 , M. Nekipelov 1,7 , V. Nelyubin 7 , D. Prasuhn
1 , A. Petrus 2 , F. Rathmann 1 , J. Sarkadi 6 , H. Seyfarth 1 , H.
Paetz gen. Schieck 3 , E. Steffens 5 , H. Ströher 1 , Yu. Uzikov 2 ,
A. Vassiliev 7 , S.Yaschenko 5 , B. Zalikhanov 2 ,andK. Zwoll 6
for the ANKE collaboration — 1 IKP, FZJ, Germany — 2 LNP, JINR
Dubna, Russia — 3 IKP, Universität zu Köln, Germany — 4 ZAT, FZJ,
Germany — 5 PI II, Universität Erlangen-Nürnberg, Germany — 6 ZEL,
FZJ, Germany — 7 HEPD, PNPI Gatchina, Russia
For nucleon-nucleon interaction studies with polarized beams and targets
at COSY/Jülich our group is currently developing a polarized internal
storage-cell gas target for the magnetic spectrometer ANKE. The
polarized atomic beam source is already performing well. Since nuclear
reactions involving polarized deuterons have not been measured sufficiently
well in the COSY energy range, our group is setting up a Lamb-
Shift target polarimeter. The implementation of the internal target into
the ring constitutes a major technological enterprise. First tests with
different apertures at the ANKE target location have been carried out.
Last year a first measurement of the cross section of the deuteron breakup
reaction pd → ppn in collinear kinematics with detection of a proton
pair near 0 ◦ was carried out. For the first time proton pairs from the
break-up reaction at relative energy Tpp < 3 MeV have been detected.
Time: Monday 16:15–19:00 Room: E
Group Report HK 6.1 Mon 16:15 E
Exploring Nuclear Matter at Extreme Temperatures and Densities:
Results from the PHENIX Experiment at RHIC — •Klaus
Reygers for the PHENIX collaboration — Institut für Kernphysik,
Westfälische Wilhelms-Universität, Münster, Germany
The Relativistic Heavy Ion Collider (RHIC) in Brookhaven/USA became
operational in the summer of 2000. This machine collides gold ions
at energies of up to √ snn = 200 GeV. The primary objective of the experiments
at RHIC is to study a form of nuclear matter in which quarks and
gluons are no longer confined within hadrons. The PHENIX experiment
consists of a multitude of specialized detector systems and is therefore
capable of measuring a variety of observables. A selection of PHENIX
results will be discussed in this talk. Among the presented results will be
the centrality dependence of identified hadron spectra and data on the
elliptic flow pattern of particle production. Furthermore hadron production
at large transverse momenta will be discussed. A striking difference
compared to results at lower energies is found - an observation that belongs
to the most important results of the first RHIC beamtime.
Group Report HK 6.2 Mon 16:45 E
Excitation Function of Λ and charged KProduction at
CERN-SPS Energies ∗ — •André Mischke 1,2 , L. Betev 2 ,
A. Billmeier 1,2 , C. Blume 1 , R. Bramm 2 , P. Buncic 2 , P.
Dinkelacker 2 , M. Ga´zdzicki 2 , T. Kollegger 2 , I. Kraus 1,2 ,
C. Markert 1,2 , R. Renfordt 2 , A. Sandoval 1,2 , R. Stock 2 , H.
Ströbele 1,2 , D. Vranic 2 , A. Wetzlar 2 , and J. Zaranek 2 —
1 GSI, Planckstrasse 1, D-64291 Darmstadt — 2 Institut f. Kernphysik,
August Eulerstr.6, D-60486 Frankfurt
Within the framework of the NA49 energy scan program, Λ hyperons
and charged Kaons were measured in central 208 Pb+ 208 Pb collisions
at 40, 80 and 158 A·GeV with a large acceptance hadron spectrometer
over a large range of rapidity and transverse momentum. Neutral

Nuclear Physics Monday
strange hadrons Λ, ¯ ΛandK 0 s are identified by reconstructing their decay
topologies. The charged decay products as well as the charged Kaons
were measured with 4 Time Projection Chambers (TPCs), two of them
are located inside 2 large dipole magnets, the other two downstream of
the magnets symmetrically to the beam line. Transverse mass spectra
and rapidity distributions for Λ and charged Kaons will be shown for
all three energies. The multiplicities at mid-rapidity and the total yields
will be studied as a function of collision energy together with AGSand
RHIC measurements and compared with model predictions. The ratio
Λ/π as well as K + /π + shows a non-monotonic energy dependence and
has a maximum between top AGSand 40 A·GeV.
∗ Supported by BMBF und GSI.
Group Report HK 6.3 Mon 17:15 E
Recent Results from the WA98-Experiment — •Henner
Büsching for the WA98 collaboration — University of Münster,
Münster, Germany
Recent results from the WA98 experiment with p and Pb induced reactions
at 158 AGeV are presented. The CERN-SPS experiment WA98
investigates the properties of hot, dense matter with the main focus on
the measurement of photons and neutral mesons with the leadglass detector
LEDA.
Azimuthal γ-γ correlations at high pT which are influenced by jet-like
structures and elliptic flow have been studied. An influence of energy loss
effects (jet-quenching) should be evident in a characteristic modification
of the correlation. A clear indication of back-to-back correlations can be
seen with strong dependence on the pT of the photons and the size of the
system.
Results on transverse mass spectra of neutral pions measured at central
rapidity are presented for impact parameter selected Pb+Pb collisions.
In going from peripheral to medium central collisions there is a nuclear
enhancement increasing with transverse mass similar to the Cronin effect,
while for very central collisions this enhancement appears to be weaker
than expected.
Finally, results on event-by-event fluctuations of average transverse
momentum of photons are presented. The magnitude of those fluctuations
can indicate the equilibration level attained in the Pb+Pb collisions.
HK 6.4 Mon 17:45 E
Two particle correlations in STAR — •Dominik Flierl, Clemens
Adler, Jens Berger, Thomas Dietel, Sören Lange, Reinhard
Stock, andChristof Struck for the STAR collaboration — Universität
Frankfurt
The STAR detector system at RHIC is built to detect a large fraction
of the hadrons produced in collisions of ultra relativistic heavy ions. The
large TPC as the central detector of STAR identifies species and momentum
of emitted particles. Most of the detected particles are pions, but a
higher level trigger enables STAR also to search for rare particles. Those
probes carry information about the early stages of the collision, but the
expansion of highly compressed nuclear matter is best observed with the
most abundant species : pions. Collective flow and spatial conditions
at thermal freeze out when the pions leave the interaction volume are
accessible by two pion correlations. We will present results from charged
pion HBT studies at √ sNN = 130GeV.
Supported by BMBF and GSI.
HK 6.5 Mon 18:00 E
Directed and Elliptical Flow Measured with the Forward-TPCs
of the STAR Experiment — •Markus Oldenburg, Volker
Eckardt, Andreas Gärtner, Patrizia Krok, Gaspare Lo
Curto, Maria Mora, Jörn Putschke, Norbert Schmitz,
Andreas Schüttauf, Frank Simon, Janet Seyboth, Peter
Seyboth, and Michael Vidal — Max-Planck-Institut für Physik,
Föhringer Ring 6, 80805 München, Germany
The STAR detector at the Relativistic Heavy Ion Collider (RHIC) measures
the hadronic observables of Au+Au collisions at √ sNN = 200 GeV
per nucleon pair. The ’Max-Planck-Institut für Physik’ in Munich contributes
two Forward-TPCs which expand the overall acceptance of
STAR into the pseudorapidity region 2.5 < |η| < 4.
Hydrodynamical models predict that in peripheral heavy-ion collisions
the initial spatial anisotropy of the reaction zone is transformed into an
anisotropy in the momentum distribution of the produced particles. This
is caused by the pressure gradient generated at a very early stage of the
collision. Anisotropic flow measures these azimuthal anisotropies by a
Fourier expansion of the azimuthal angular distribution of the detected
hadrons.
Due to their acceptance coverage the FTPCs are suited to measure not
only elliptical flow v2 (2 nd order Fourier coefficient) as the TPC already
did in the region |η| < 1.5 but also directed flow v1 (1 st order Fourier
coefficient). Therefore these detectors allow the determination of the (up
to now) unknown sign of v2. In this talk a feasibility study and first
results of the flow measurement with the FTPCs will be presented.
HK 6.6 Mon 18:15 E
Measurement of the Transverse Energy Distribution at Midrapidity
in √ sNN = 130 GeV Au + Au Collisions by the PHENIX-
Experiment at RHIC — •Christian Klein-Bösing —University
of Münster, Germany
The Relativistic Heavy Ion Collider (RHIC) in Brookhaven/USA
started operation in the summer of 2000. During the first running period
of RHIC gold-gold collisions with energies up to √ sNN = 130 GeV has
been created. The PHENIX detector at RHIC is able to measure the
properties of nuclear matter at the highest temperatures and energy
densities produced in these collisions.
To allow an estimation of the energy density the measurement of energy
produced transverse to the beam direction provides valuable information,
which can be compared to predictions of a phase transition at
energy densities of about one GeV/fm 3 . The centrality dependence of
the transverse energy is compared to results at lower energies from other
experiments.
HK 6.7 Mon 18:30 E
Neutral Pion Spectra in Au+Au collisions at √ s NN = 130 GeV
— •Stefan Bathe for the PHENIX collaboration — University of
Münster, Germany
Transverse momentum spectra for neutral pions in the range 1 GeV/c

Nuclear Physics Monday
HK7 Instrumentation and Applications I
Time: Monday 16:15–19:00 Room: F
Group Report HK 7.1 Mon 16:15 F
The source for ultra-cold neutrons at the research neutron facility
FRM-II — •F. Joachim Hartmann, Igor Altarev, Andreas
Frei, Stephan Gröger, Stephan Paul, Gerd Petzoldt,
Wolfgang Schott, Uwe Trinks, andOliver Zimmer —Physik-
Department, Technische Universität München
A source for ultra-cold neutrons (UCN) with solid deuterium is planned
for the new Munich high-flux neutron source FRM-II. Ultra-cold neutrons
have energies below about 250 neV and may be stored in vessels, magnetic
bottles and by gravity. The new source, Mini-D2, will be installed
in beam tube SR-4 of FRM-II. It consists of a so-called converter, about
170 cm 3 of solid deuterium at a temperature of 5 K, and the storage volume,
an evacuated tube of 6 cm diameter and about 8 m length. The
walls of the storage tube will be coated with Be. The converter is located
inside the storage volume very close to the Cold Source of FRM-II.
From model calculations we may expect that in pulsed mode the source
will produce UCN densities of about 10 4 cm −3 , by far more than the
world’s best sources existing up to now. This enhancement in density
will allow to measure important properties of the free neutron like the
electric dipole moment or the lifetime with strongly improved precision.
The layout of the source and the first experiment planned, the magnetic
confinement of UCN, will be presented.
Group Report HK 7.2 Mon 16:45 F
The new, high-intensity ultracold neutron source at PSI —
•Reinhold Henneck for the SUNS collaboration collaboration — Paul-
Scherrer-Institut, CH-5232 Villigen, Schweiz
The new PSI source for ultracold neutrons (UCN) is based on an intense,
pulsed proton beam with a very low duty cycle, a spallation target
of heavy material which is able to stand the high beam load of 2 mA
for several seconds and a large moderator (30 l) of solid deuterium at
about 6 K. Recent experimental studies have revealed a large gain factor
for the production of UCN in solid deuterium from which one expects
UCN densities in excess of 1000 UCN/cm 3 . This improvement of about
2 orders of magnitude over existing facilities will open new prospects for
studies of fundamental properties of the neutron and its decay. As a
first experiment we intend to improve the sensitivity in the measurement
of the neutron electric dipole moment to about 5 · 10 −28 e·cm. We will
discuss the general principle of this new type of source as well as details
of the most important subsystems which are now being developed: (1)
proton target, (2) heavy water moderator/ reflector, (3) solid deuterium
moderator, (4) storage vessel and neutron guides.
Group Report HK 7.3 Mon 17:15 F
First Successful Stopping, Bunching and Trapping of Radioactive
Ions at the Ion Trap Facility SHIPTRAP at GSI Darmstadt
— •W. Quint 1,2,3,4 , D. Ackermann 1 , F. Attallah 1 , H. Backe 2 ,
D. Beck 1 , A. Dretzke 2 , O. Engels 3 , D. Habs 3 , F. Herfurth 4 , F.
Hessberger 1 , S. Hofmann 1 , H.-J. Kluge 1 , W. Lauth 2 , B. Lommel
1 , G. Marx 1 , G. Münzenberg 1 , M. Mukherjee 1 , J. Neumayr 3 ,
S. Rahaman 1 , D. Rodriguez 1 , C. Scheidenberger 1 , M. Sewtz 2 ,
G. Sikler 1 , M. Tarisien 1 , P. Thirolf 3 , V. Varentsov 3 ,andC.
Weber 1 — 1 GSI Darmstadt — 2 Universität Mainz — 3 Universität
München — 4 CERN
SHIPTRAP is an ion trap facility at the separator for heavy-ion reaction
products (SHIP) at GSI. The scientific programme of the SHIP-
TRAP facility comprises mass spectrometry, nuclear spectroscopy, laser
spectroscopy and chemistry of transeinsteinium elements. The SHIP-
TRAP facility consists of a gas cell for stopping and thermalizing highenergy
recoil ions from SHIP, a rf ion guide for extraction of the ions
from the gas cell, a linear rf trap for accumulation and bunching of the
ions, and a Penning trap for isobaric purification. In first on-line tests
we successfully stopped, accumulated and trapped radioactive nuclides
which were produced in fusion reactions of a 40 Ca primary beam with
a cerium target. The radioactive nuclides were extracted from the ion
trap and identified by time-of-flight detection. The total efficiency for
stopping, accumulating and trapping the ions was about 1 %.
HK 7.4 Mon 17:45 F
Ein Multilayer-Detektor zum Nachweis von ultrakalten Neutronen
— •Gerd Petzoldt 1 , Igor Altarev 1 , Stephan Gröger 1 , Erwin
Gutsmiedl 2 , F. Joachim Hartmann 1 , Peter Maier-Komor 1 ,
Stephan Paul 1 , Wolfgang Schott 1 , Uwe Trinks 1 und Oliver
Zimmer 1 — 1 Physik-Department, Technische Universität München —
2 FRM II, Technische Universität München
Es wurde ein Halbleiterdetektor für ultrakalte Neutronen (UCN) entwickelt,
der auf einer Silizium PIN-Diode basiert. Zum Nachweis der
Neutronen wird die Reaktion 6 Li(n,α) 3 H in einer auf den Detektor aufgebrachten
Konverterschicht aus 6 LiF verwendet. Um das optische Potential
der Oberfläche für Neutronen zu verringern, wird das 6 LiF mit einem
Material negativer Streulänge in einer Multilayerstruktur kombiniert; die
resultierende Reflektivität für Neutronen wurde für verschiedene Multilayerstrukturen
mit einem Neutronenoptik-Programm berechnet. Der
Energieverlust der Reaktionsprodukte in den verschiedenen Strukturen
wurde mittels eines Monte-Carlo-Programmes simuliert. Drei Strukturen
wurden hergestellt und in zwei verschiedenen Experimenten am Institut
Laue-Langevin (ILL) in Grenoble, Frankreich, getestet. Die Ergebnisse
werden vorgestellt.
HK 7.5 Mon 18:00 F
Measurements at the Jyväskylä RFQ-cooler— •A. Wilfart 1 , T.
Sieber 1 , O. Kester 1 , D. Habs 1 , A. Nieminen 2 ,andJ. Szerypo 2 —
1 Sektion Physik, LMU München, Am Coulombwall 1, D-85748 Garching
— 2 University of Jyväskylä, PB35 YFL, FIN-40351 JYV ÄSKYLÄ
In order to measure the beam emittance of cooled low energetic ion
beams (30 keV) from the Jyväskylä RFQ-ion-cooler, we designed an emittance
meter for very low intensities and low beam energies by SIMION.
We wanted to examine the dependence of the transmission and the emittance
on the beam intensity (20pA-40nA) injected into the cooler device.
In addition the improvement of the beam emittance due to the cooler
has been studied. Finally the effect of different beam optic elements in
the beam line, e. g. ”einzellenses”and skimmer electrodes on the beam
could be easily measured with the emittance meter. The results of the
measurements and the emittance meter lay-out in hard and software will
be presented.
HK 7.6 Mon 18:15 F
Messung der Ortssensitivität eines 12-fach segmentierten, gekapselten
HPGe-Detektors — •D. Weißhaar, J. Eberth, J. Jolie,
H.G. Thomas, T. Waasem und N. Warr — Institut für Kernphysik,
Universität zu Köln
Segmentierte HPGe-Detektoren ermöglichen den Aufbau kompakter γ-
Spektrometer mit hoher Granularität wie das MINIBALL- Spektrometer
für Messungen am radioaktiven Strahl. Die Granularität ist notwendig
um die Dopplerverbreiterung von γ-Linien bei Experimenten mit hohem
v/c der γ-emittierenden Kerne zu minimieren. Der 12-fach segmentierte
Detektor entspricht dem 6-fach segmentierten MINIBALL-Detektor
mit einer zusätzlichen Quersegmentierung, die den vorderen Bereich vom
hinteren abtrennt. Der Detektor wurde mit einer kollimierten Quelle
abgetastet und die Verbesserung der Ortssensitivität aufgrund der
zusätzlichen Tiefeninformation im Vergleich zum 6-fach segmentierten
MINIBALL-Detektor untersucht.
[1]J.Eberthet al., Prog. Part. Nucl. Phys. 46, 389 (2001).
gefördert durch das BMBF (06OK958)
HK 7.7 Mon 18:30 F
Feasability study of spin correlations in 2 He ( 1 S0) — •J.
Heyse 1 , C. Bäumer 2 , A.M. van den Berg 3 , E.L. Bolster 4 ,
J.A. Brooke 5 , P. Busch 4 , M. Hagemann 1 , M.N. Harakeh 3 ,
M.A. de Huu 3 , C. Polachic 5 , C. Rangacharyulu 5 , and H.J.
Wörtche 3 for the EuroSuperNova collaboration — 1 Vakgroep Subatomaire
en Stralingsfysica, Universiteit Gent, Belgium — 2 Westfälische
Wilhems-Universität Münster — 3 Kernfysisch Versnellerinstituut,
Rijksuniversiteit Groningen, The Netherlands — 4 University of Hull,
United Kingdom — 5 Univeristy of Saskatchewan, Canada
We present results of a feasability study for examining the Einstein-
Podolsky-Rosen type spin correlations of protons in a 1 S0 intermediate
state. A deuteron beam of 170 MeV was extracted from the AGORcyclotron
at KVI, producing protons in a 12 C(d, 2 He) 12 B reaction popu-

Nuclear Physics Monday
lating the ground state of 12B. The coincident measurement of the proton
momenta and spin-correlations was performed by means of the Big-Bite
Spectrometer and the EuroSuperNova detector. The experiment opts for
a precision test of quantum mechanical predictions versus Bell’s inequalities.
HK 7.8 Mon 18:45 F
Tracking Detectors for Gamma-ray Imaging — •Lucian Mihailescu,
Werner Gast, andRainer Lieder — Forschungszentrum
Jülich, IKP, Jülich
Gamma-ray imaging devices based on the Compton-camera principle
could provide the highest detection efficiency, at least in theory, since
they do not require any kind of collimation or masking. In reality, the
large volume detectors needed for good efficiency, the high granularity
needed for precise localization of the Compton interactions, and the high
HK8 Plenary Session
energy resolution needed for the reconstruction of the scattering angles
made them incompetitive for practical implementation with respect to
other approaches until now. With the advent of a new technical concept,
the gamma-ray tracking detector, this situation may change. The
tracking detector is a large volume high resolution semiconductor detector
with relatively low granularity, but combined with advanced digital
signal processing methods it is able to provide an effective position sensitivity
being two orders of magnitude higher than that given by the
physical granularity. The signal processing employs the WPC (Wavelet
transform - Pattern recognition - Correlation) analysis which decomposes
and extracts multiple interactions occuring in the detector by analyzing
the features of the digitized detector segment signals. In this contribution
we present the relevant criteria for a Compton-camera design based
on tracking detector principles with planar Ge diodes.
Time: Tuesday 08:30–10:30 Room: Plenarsaal
Plenary Talk HK 8.1 Tue 08:30 Plenarsaal
Aspects of Confinement in QCD: The Glue of Strong Interactions
— •Lorenz von Smekal —Universität Erlangen-Nürnberg
In QED, the charge of a particle is of long-range nature. It can exist
because the photon is massless. Localized objects are neutral like atoms.
Without symmetry breaking, or Higgs mechanism, particles carrying the
charges of the gauge group must be non-local objects. With mass gap
such objects cannot exist in QCD, and all hadrons are thus color-neutral.
Here, I present two approaches to study this phenomenon.
Charged states are always possible with suitable boundary conditions
in a finite volume. This allows to study their fate in the thermodynamic
limit from Monte-Carlo simulations on finite lattices. Suggesting the
picture of a dual Meissner effect, the confinement of electric and the
condensation of magnetic charges can be demonstrated in this way. 1
In the covariant continuum formulation, the conditions for confinement
relate to the infrared behavior of gluon and ghost correlations. Confinement
is then encoded in critical infrared exponents. 2
The necessity of fixing a gauge in this formulation is affected by the
Gribov problem. This problem, ways to by-pass it, and implications on
the mass gap and confinement are discussed.
1 Ph. de Forcrand and L. von Smekal, preprint [hep-lat/0107018].
2 R. Alkofer and L. von Smekal, Physics Reports 353/5-6 (2001) 281.
Plenary Talk HK 8.2 Tue 09:00 Plenarsaal
Search for Three-Body Force Effects — •Nasser Kalantar-
Nayestanaki — KVI, Groningen, The Netherlands
Three-body forces are, though small, very important in nature. The
effect of these forces have far-reaching consequences in many fields of
physics. In nuclear physics, a relatively good understanding of most
phenomena has been arrived at by only considering two-nucleon forces.
However, high precision data emerging are revealing the shortcomings of
these forces. In the last few decades, the two-nucleon system has been
thoroughly investigated both experimentally and theoretically. These
studies have resulted in modern potentials which describe the bulk of
the data in a large range of energy. This knowledge can be employed in
the Faddeev framework to calculate scattering observables in three-body
systems. In regions where the effects of Coulomb force are considered
to be small or can be calculated accurately, and energies are low enough
HK9 Poster Session: Theory
to avoid relativistic effects, deviations from experimental data must then
be a signature of effects like three-body force effects. Data such as those
obtained from elastic and inelastic proton-deuteron scattering can thus
provide more information on three-body forces.
Plenary Talk HK 8.3 Tue 09:30 Plenarsaal
Properties of K-Mesons in the Nuclear Medium — •Christian
Sturm — GSI Darmstadt
Experimental data on the production and propagation of kaons and
antikaons in heavy ion collisions at relativistic energies are reviewed with
respect to in-medium effects. The K − /K + ratios measured in nucleusnucleus
collisions are 1 - 2 orders of magnitude larger than in protonproton
collisions. The azimuthal angle distributions of K + mesons indicate
a repulsive kaon-nucleon potential. Microscopic transport calculations
consistently explain both the yields and the emission patterns
of kaons and antikaons assuming that their properties are modified in
dense nuclear matter. The K + production excitation functions measured
in light and heavy collision systems provide evidence for a soft nuclear
equation-of-state.
Plenary Talk HK 8.4 Tue 10:00 Plenarsaal
Pionic 1s States in Heavy Atoms and the Pion-Nucleus Interaction
— •Albrecht Gillitzer — IKP, Forschungszentrum Jülich
In the lowest energy levels negative pions bound to heavy nuclei form
halo-like states whose size is given by nuclear dimensions. The 1s states
are almost exclusively determined by the s-wave part of the interaction,
which is therefore directly accessible by the measurement of pionic binding
energies and widths. The deduced repulsive central potential is significantly
larger than resulting from the free πN interaction which indicates
the presence of nuclear medium effects.
Deeply bound pionic states in heavy atoms are inaccessible in electromagnetic
cascades subsequent to the capture of stopped negative pions,
and can only be populated in direct reactions. In a series of experiments
at the GSI Fragment Separator these states were discovered in 207 Pb and
then more precisely studied in 205 Pb. Very recently the formation of pionic
1s states in several Sn isotopes was studied in order to investigate
the isotope dependence which would allow to separate the isoscalar and
the isovector part of the interaction. First results of this new experiment
will be presented.
Time: Tuesday 10:30–12:45 Room: Foyer Chemie
HK 9.1 Tue 10:30 Foyer Chemie
Dispersive Effects in Nucleon Polarisabilities Observed in
Deuteron Compton Scattering — •Harald W. Grießhammer
— Institut für Theoretische Physik (T39), TU München, D-85747
Garching — ECT*, Villa Tambosi, I-38050 Villazzano (Trento), Italy
A formalism to extract the dynamical nucleon polarisabilities defined
via a multipole expansion of the structure amplitudes in nucleon Compton
scattering was developed in [1]. In contradistinction to the static
polarisabilities, dynamical polarisabilities gauge the response of the in-
ternal degrees of freedom of a composed object to an external, real photon
field of arbitrary energy. Being energy dependent, they contain information
about dispersive effects induced by internal relaxation mechanisms,
baryonic resonances and meson production thresholds of the nucleon.
As the iso-scalar dynamical polarisabilities are directly accessible in
low energy deuteron Compton scattering, their energy dependence is discussed
especially in the light of the SAL data at ω =91MeVwhich
suggest a magnetic dipole polarisability five times bigger than values
from extractions at zero energy. At those energies, dynamical effects are

Nuclear Physics Tuesday
however large and cannot be mimicked by taking only the slopes of the
polarisabilities at zero energy into account. An analysis using dynamical
polarisabilities from either Heavy Baryon Chiral Perturbation Theory
including the ∆(1232) as dynamical degree of freedom or using dispersion
theory predicts however values in agreement with experiment at all
energies. We comment on recent data from Lund at ω ≈ 50 MeV.
Supported in part by DFG under grant GR 1887/1-2 and by BMBF.
[1.] H.W. Grießhammer and T.R. Hemmert: nucl-th/0110006.
HK 9.2 Tue 10:30 Foyer Chemie
Debye Screening At Finite Temperature, Revisited — •Roland
A. Schneider — Physik-Department, Technische Universität München,
Garching, Germany
We present a new, alternative way to calculate the screening of the
static potential between two charges in (non)abelian gauge theories at
high temperatures by looking at the magnetic properties of the vacuum.
The Hard Thermal Loop (HTL) gluon and photon Debye masses are
recovered in a first, though incomplete approximation. In QED, the
complete calculation to order α exhibits an interesting cancellation of
terms, resulting in a logarithmic running α(T ). Debye screening is then
caused by the modified index of refraction of the vacuum. In QCD, an
unphysical Landau pole occurs that arises, as in more sophisticated thermal
renormalization group calculations, from the wrong sign of the gluon
contribution.
Supported in part by BMBF and GSI.
HK 9.3 Tue 10:30 Foyer Chemie
Thermodynamics of fireball expansion — •Thorsten Renk 1 ,
Roland A. Schneider 1 ,andWolfram Weise 1,2 — 1 Technische Universität
München — 2 ECT ∗ ,Trento
The fireball created in an ultrarelativistic heavy ion collision is the
environment in which all processes providing clues about the possible
formation of the quark-gluon plasma (QGP) happen. It is therefore crucial
to understand the dynamics of this hot and dense system. We set
up a model in which the fireball evolution is reconstructed between two
stages, the freeze-out, which is accessible by hadronic observables, and
the initial conditions for which the overlap geometry can be calculated.
Using the equation of state (EoS) provided by a quasiparticle model of
the QGP, we are able to calculate thermodynamical properties in volume
slices of constant proper time and determine the volume expansion selfconsistently.
The resulting evolution model can then be tested against
other observables.
Work supportet in part by BMBF and GSI.
HK 9.4 Tue 10:30 Foyer Chemie
Simple High Accuracy Calculations of the Three Nucleon System
at Very Low Energies — •Harald W. Grießhammer —
Institut für Theoretische Physik (T39), TU München, D-85747 Garching
At very low energies, pions do not have to be treated as explicit degrees
of freedom in an Effective Field Theory of few nucleon systems. The resulting
power counting allows for simple, model independent, systematic
and rigorous computations of the properties of nuclear systems with an
error estimate. Usually, high precision calculations are performed with
relative ease. In the triton channel of the three nucleon system, it has
however been demonstrated [1] that an unusual, non-perturbative renormalisation
phenomenon leads to a three body force which is needed even
at leading order in order to absorb cut-off dependence. This yields a
limit cycle for the three body force, and explanations of the Efimov and
Thomas effects as well as of the Phillips line of nuclear physics. Here,
it is shown that this phenomenon is limited to the doublet Swave only,
so that computations in the other channels can be performed with ease
to high accuracy. Demonstrating a new technique to obtain results of
increasing accuracy in the Effective Field Theory approach, corrections
to the Phillips line obtained at LO as well as phase shifts in the triton
channel of nd scattering are discussed both above and below the deuteron
breakup point. The calculations converge rapidly.
Supported in part by DFG under grant GR 1887/1-2 and by BMBF.
[1.] P. Bedaque, H.-W. Hammer and U. van Kolck: Nucl. Phys. A676,
357 (2000).
HK 9.5 Tue 10:30 Foyer Chemie
Note on finite temperature sum rules for vector and axialvector
spectral functions — •Eugenio Marco 1 , Ralf Hofmann 2 ,
and Wolfram Weise 1,3 — 1 Physik-Department, Technische Universität
München — 2 Max-Planck-Institut für Physik (Werner-Heisenberg-
Institut), — 3 ECT ∗ , Villazzano (Trento), Italy
An updated analysis of vector and axial-vector spectral functions is
presented. The resonant contributions to the spectral integrals are shown
to be expressible as multiples of 4π2f 2 π , encoding the scale of spontaneous
chiral symmetry breaking in QCD. Up to order T 2 this behavior carries
over to the case of finite temperature.
Work supported in part by BMBF, GSI and the Alexander von Humboldt
Foundation.
HK 9.6 Tue 10:30 Foyer Chemie
Chiral Magnetism of the Nucleon — •Thomas R. Hemmert 1
and Wolfram Weise 1,2 — 1 Physik Department T39, TU München
— 2 ECT*, Trento, Italy
We are analysing the quark-mass dependence of the isovector anomalous
magnetic moment of the nucleon [1]. Quenched Lattice data for this
quantity from the Adelaide group [2] are only available for quark-masses
heavier than 20 times the physical light quark masses, making extrapolation
schemes necessary to bridge the gap between lattice data and the
physical magnetic moments of the nucleon. We report on recent work
of such an extrapolation performed with the help of chiral effective field
theories, resulting in a simple extrapolation formula for the case of the
magnetic moments. We also compare our extrapolation formula with the
Pade-formula recently suggested by the Adelaide group [2].
[1] T.R. Hemmert and W. Weise, “Chiral Magnetism of the Nucleon”,
forthcoming. Preliminary results are reported in nucl-th/0105051.
[2] D.B. Leinweber, D.H. Lu and A.W. Thomas, Phys.Rev.D60:034014
(1999).
WorksupportedinpartbyDFGandBMBF
HK 9.7 Tue 10:30 Foyer Chemie
Baryon chiral perturbation theory with a cutoff regularization:
Inclusion of decuplet states — •Bu¯gra Borasoy 1 , Barry Holstein
2 , Randy Lewis 3 , and Pierre Ouimet 3 — 1 Physik Department,
Technische Universität München — 2 University Of Massachusetts,
Amherst, USA — 3 University of Regina, Regina, Canada
In SU(3) chiral perturbation theory short distance effects, arising from
the propagation of Goldstone bosons over distances smaller than a typical
hadronic size, are model-dependent and can lead to a lack of convergence
in the SU(3) chiral expansion if they are included in loop diagrams. Such
effects can be removed in a chirally consistent fashion by use of a cutoff
ameliorating problems which have arisen in previous calculations due to
large loop effects. In this investigation, we employ cutoff regularization
and focus on the inclusion of decuplet states which may yield significant
contributions since the mass difference between the nucleon and decuplet
is less than twice the pion mass and octet and decuplet states become
even degenerate in the large Nc limit. We discuss the octet baryon
masses, axial couplings, s-wave hyperon decay, and magnetic moments
taking contributions from internal decuplet states into account. The realistic
treatment of chiral baryon corrections is just what is needed in
order to extrapolate state of the art lattice calculations, which are done
for quark masses (and therefore pion masses) considerably heavier than
the values given experimentally, down to realistic values.
Work supported in part by the DFG.
HK 9.8 Tue 10:30 Foyer Chemie
Study of relativistic bound states in a scalar model using diagonalization/Monte
Carlo methods — •Bu¯gra Borasoy 1 and
Dean Lee 2 — 1 Physik Department, Technische Universität München
— 2 North Carolina State University, Raleigh, USA
A recently proposed diagonalization/Monte Carlo computational
scheme is used to study relativistic two-body and three-body bound
states in (φ 6 − φ 4 )1+1 theory. Diagonalization makes it possible to
extract detailed information about wavefunctions and excited states,
while Monte Carlo allows one to handle the exponential increase in the
number of basis states for large volume systems. The first half of the
method involves finding and diagonalizing the Hamiltonian restricted to
an optimal subspace which includes the most important basis vectors
of the lowest energy eigenstates. Once the most important basis
vectors are found and their interactions treated exactly, Monte Carlo
is used to sample the contribution of the remaining basis vectors. In

Nuclear Physics Tuesday
this investigation we demonstrate how the new diagonalization/Monte
Carlo scheme is applied to the study of relativistic bound states
which are of primary interest to particle and nuclear physics. We also
derive solutions to the non-relativistic versions of the two- body and
three-body bound state problems and compare our numerical results
for the relativistic bound states energies and wavefunctions with an
assortment of different approximations and results from the literature.
We find that the approach is well-suited for calculating bound state
energies and wavefunctions.
Work supported in part by the DFG.
HK 9.9 Tue 10:30 Foyer Chemie
Chiral 2π-exchange NN-potentials: Relativistic 1/M 2 -
corrections — •Norbert Kaiser — Physik-Department T39,
TU-München, 85747 Garching
We calculate in baryon chiral perturbation theory the relativistic
1/M 2 -corrections to the leading order two-pion exchange diagrams. We
give explicit expressions for the corresponding one-loop NN-amplitudes
in momentum space. The resulting isovector central and isoscalar spinspin
and tensor NN-amplitudes involve non-static terms proportional to
the squared nucleon center-of-mass momentum p 2 . From the two-pion
exchange box diagrams we obtain an isoscalar quadratic spin-orbit NNamplitude.
We give also analytical expressions for the corresponding
NN-potentials in coordinate space. The diagrammatic results presented
here make the chiral NN-potential complete at next-to-next-to-next-toleading
order.
[1] N. Kaiser, Phys.Rev.C65 (2002) 0170xx (in print), nucl-th/0109071.
Work supported in part by BMBF, DFG and GSI.
HK 9.10 Tue 10:30 Foyer Chemie
Chiral corrections to the double scattering term for the
pion-deuteron scattering length — •Norbert Kaiser —
Physik-Department T39, TU-München, 85747 Garching
The empirical value of real part of the pion-deuteron threshold Tmatrix
Re Tπd =4π(1+mπ/Md)Re aπd = −(0.496±0.016) fm can be well
understood in terms of the dominant isovector πN double scattering con-
tribution Re Tπd = −(T − πN) 2 < (πr) −1 >d with < 1/r >d= � ∞
0 dr[u2 (r)+
w 2 (r)]/r the inverse deuteron radius. However, since the leading order
(Weinberg-Tomozawa) prediction for T − πN = mπ/2f 2 π =1.61 fm is about
13% below the empirical value the leading order chiral double scattering
contribution to Re Tπd is also about 25% too small. We calculate in chiral
perturbation theory all one pion-loop corrections to the double scattering
term which in the case of πN-scattering close the gap between the
current algebra prediction and the empirical value of T − πN. In addition
there is in the πd-system an off-shell correction for the exchanged virtual
pion. Its coordinate space representation reveals that it is equivalent to
2π-exchange in the deuteron with a large distance behavior e −2mπr r −5/2 .
When folded with the deuteron density its short distance singularity r −3
is regulated by introducing rmin =1/Λ =0.23 fm with Λ a cutoff entering
the chiral logarithm ln(mπ/2Λ) in T − πN. We evaluate the chirally
corrected double scattering term and the off-shell contribution with various
realistic deuteron wave functions. We find that the off-shell correction
contributes at most -8% and that the isovector double scattering term
explains at least 90% of the empirical value of Re Tπd. Work supported
in part by BMBF, DFG and GSI.
HK 9.11 Tue 10:30 Foyer Chemie
Chiral 2π-exchange NN-potentials: Two-loop contributions —
•Norbert Kaiser — Physik-Department T39, TU-München, 85747
Garching
We calculate in heavy baryon chiral perturbation theory the local NNpotentials
generated by the two-pion exchange diagrams at two-loop order.
We give explicit expressions for the mass-spectra (or imaginary
parts) of the corresponding isoscalar and isovector central, spin-spin and
tensor NN-amplitudes. We find from two-loop two-pion exchange a sizeable
isoscalar central repulsion which amounts to 62.3MeVatr =1.0fm.
There is a similarly strong isovector central attraction which however
originates mainly from the third order low energy constants ¯ dj entering
the chiral πN-scattering amplitude. We also evaluate the one-loop
2π-exchange diagram with two second order chiral ππNN-vertices proportional
to the low energy constants c1,2,3,4 as well as the first relativistic
1/M -correction to the 2π-exchange diagrams with one such vertex. The
diagrammatic results presented here are relevant components of the chiral
NN-potential at next-to-next-to-next-to-leading order.
[1] N. Kaiser, Phys. Rev. C64 (2001) 057001. Work supported in part
by BMBF, DFG and GSI.
HK 9.12 Tue 10:30 Foyer Chemie
Chiral corrections to kaon nucleon scattering lengths —
•Norbert Kaiser — Physik-Department T39, TU-München, 85747
Garching
We calculate the threshold T-matrices of kaon-nucleon and antikaonnucleon
scattering to one-loop order in SU(3) heavy baryon chiral perturbation
theory. To that order the complex-valued isospin-1 KN threshold
T-matrix can be successfully predicted from the isospin-0 and 1 KN
threshold T-matrices. As expected perturbation theory fails to explain
the isospin-0 KN threshold T-matrix which is completely dominated by
the nearby subthreshold Λ ∗ (1405)-resonance. Cancelations of large terms
of second and third chiral order are observed as they seem to be typical
for SU(3) baryon chiral perturbation theory calculations. We also give
the kaon and eta loop corrections to the πN scattering lengths and we
investigate πΛ scattering to one-loop order. The second order s-wave
low-energy constants are all of natural size and do not exceed 1 GeV −1
in magnitude.
[1] N. Kaiser, Phys. Rev. C64 (2001) 045204. Work supported in part
by BMBF, DFG and GSI. paragraph
HK 9.13 Tue 10:30 Foyer Chemie
Nuclear spin-orbit interaction from chiral pion-nucleon dynamics
— •Norbert Kaiser — Physik-Department T39, TU-München,
85747 Garching
Using the two-loop approximation of chiral perturbation theory, we calculate
the momentum and density dependent nuclear spin-orbit strength
Uls(p, kf). This quantity is derived from the spin-dependent part of the
interaction energy Σspin = i
2 �σ · (�q × �p ) Uls(p, kf) of a nucleon scattering
off weakly inhomogeneous isospin symmetric nuclear matter from initial
momentum �p−�q/2 tofinalmomentum�p+�q/2. We find that iterated 1πexchange
generates at saturation density kf0 = 272.7 MeV a spin-orbit
strength at p =0ofUls(0,kf0) =35.1MeVfm 2 in perfect agreement with
the empirical value used in the shell model. This novel spin-orbit strength
is neither of relativistic nor of short range origin. In fact it is linearly
proportional to the nucleon mass M and its range is the pion Compton
wave length m −1
π =1.46 fm. The potential Vls underlying the spin-orbit
strength � Uls = Vls r 2 ls becomes a rather weak one, Vls = 17 MeV, after the
identification rls = m −1
π as suggested by the present calculation. We observe
however a strong p-dependence of Uls(p, kf0) leading even to a sign
change at p = 200 MeV. This and other features of Σspin which go beyond
the usual shell model parametrization leave questions concerning the ultimate
relevance of the spin-orbit interaction generated by 2π-exchange
in a finite nucleus. We calculate also the isovector part of the single
particle potential in isospin asymmetric nuclear matter proportional to
τ3(N − Z)/(N + Z) and find reasonable agreement with empirical values.
Work supported in part by BMBF, DFG and GSI.
HK 9.14 Tue 10:30 Foyer Chemie
Development of a parton cascade for ultrarelativistic heavy ion
collisions — •Zhe Xu and Carsten Greiner — Institut für Theoretische
Physik, Universität Gießen, Germany
We present a Monte Carlo program solving the Boltzmann equation
for partons in ultrarelativistic heavy ion collisions. The initial parton
momentum distribution is computed in perturbative QCD via the multiple
production of minijets. At present, the treatment includes only
elastic scatterings among the partons. We also discuss the initial spatial
distribution of parton production and its consequence on parton thermalization
in heavy ion collisions.
Work supported by BMBF.
HK 9.15 Tue 10:30 Foyer Chemie
Quantum transport for Φ 4 theory in 2+1 dimensions — •Sascha
Juchem, Wolfgang Cassing, andCarsten Greiner — Institut für
Theoretische Physik, Universität Gießen, Germany
During the last years quantum off-shell transport theory has reachieved
great interest in the description of strongly interacting matter out of equilibrium.
In this context approaches are favoured that go beyond the standard
quasiparticle picture and take into account the dynamical off-shell
properties of the propagating degrees of freedom. We exactly solve the
general quantum mechanical transport equations - the Kadanoff-Baym
equations - for the model case of a Φ 4 theory in 2 + 1 space-time dimensions.
While restricting to homogeneous configurations in space, we study
thermal equilibration, taking into account the appropriate renormaliza-

Nuclear Physics Tuesday
tion prescription. Furthermore, we investigate the influence of standard
many-body approximation schemes to the full theory.
Work supported by GSI and BMBF.
HK 9.16 Tue 10:30 Foyer Chemie
Wide–angle Compton scattering and generalized parton distributions
— •T. Oppermann 1 , A.V. Radyushkin 2 , A. Schäfer 1 ,
and C. Weiss 1 — 1 Institut für Theoretische Physik, Universität Regensburg,
D–93053 Regensburg, Germany — 2 Theory Group, Jefferson
Lab, Newport News, VA 23606, USA, and Old Dominion University,
Norfolk, VA 23529, USA
Real Compton scattering off the nucleon, γN → γN, at COM energies
s ∼ few GeV 2 and sufficiently large t (wide–angle Compton scattering,
WACS) is measured in the Hall A experiment at JLAB. In QCD this
process is dominated by Compton scattering off a single quark in the nucleon,
accompanied by soft interactions with the spectator system (“soft
mechanism”) [1]. The WACSamplitude can be expressed in terms of the
so–called double distribution of quarks in the nucleon, which at small t
can be related to the generalized parton distributions measured in hard
exclusive electroproduction. We present estimates of the WACScross
section incorporating information about the structure and the modeling
of the double distributions gained from studies of hard scattering processes,
in particular the so–called D–term [2]. We also discuss the role of
O(t/s) kinematical corrections to the WACSamplitude.
[1] A. V. Radyushkin, Phys. Rev. D58 (1998) 114008
[2]M.V.PolyakovandC.Weiss,Phys.Rev.D60 (1999) 114017
HK 9.17 Tue 10:30 Foyer Chemie
Simple picture of twist–3 effects in deeply–virtual Compton
scattering — A.V. Radyushkin 1 and •C. Weiss 2 — 1 Theory Group,
Jefferson Lab, Newport News, VA 23606, USA, and Old Dominion University,
Norfolk, VA 23529, USA — 2 Institut für Theoretische Physik,
Universität Regensburg, D–93053 Regensburg, Germany
Deeply–virtual Compton scattering (DVCS) is being widely discussed
as a process which allows to measure the generalized parton distributions
(GPD’s) of the nucleon. While the original QCD treatment included only
the twist–2 contribution to the DVCSamplitude [1], various investigations
have shown that gauge invariance requires one to include also certain
kinematical twist–3 contributions, leading to more complicated relations
between the GPD’s and the observable cross sections (Wandzura–
Wilczek–type relations) [2]. We show that these twist–3 contributions
can be understood in a simple way, as a spin rotation applied to the
twist–2 part of the quark density matrix in the target [3]. This allows
for a very compact representation of the twist–3 effects, as well as for a
simple physical interpretation.
[1] X. Ji, Phys. Rev. D55 (1997) 7114; A. V. Radyushkin, Phys. Rev.
D56 (1997) 5524
[2] A. V. Radyushkin and C. Weiss, Phys. Lett. B493 (2000) 332; Phys.
Rev. D 63 (2001) 114012
[3] A. V. Radyushkin and C. Weiss, Phys. Rev. D 64 (2001) 097504
HK 9.18 Tue 10:30 Foyer Chemie
Collective dynamics in selfconsistent Mean-Field-Models —
•Patrick Fleischer and Paul-Gerhard Reinhard — Institut
fuer theoretische Physik II, Universitaet Erlangen-Nuernberg, Staudtstr.
7, 91058 Erlangen, Germany
The low-energy dynamics of nuclei are dominated by rotations and
surfacevibrations. Exotic nuclei often show very soft potential-energysurfaces
(PEF) for these vibration-modes. The low energy spectra provide
important information about the underlying PEF.
We present results of theoretical low energy spectra calculations. The
basis of the description is the selfconistent Skyrme-Hartree-Fock-Method.
The PEF are unfolded by using a quadrupole constraint. The collective
masses (and zero point energies corrections) are calculated with selfconsistent
cranking. Using the PEF together with the masses one can
calculate the excitation spectra with a collective Bohr Hamiltonian.
We consider the trends of quadrupol excitations in light exotic nuclei
(S, Mg). We investigate heavy neutrondeficient nuclei having strong
formisomers which lead to dense monopole states. Further on we calculate
the two nucleon gaps of magic nuclei (Sn, Pb). We compare results
of different available Skyrme-Forces. The trends of these forces are quite
similar but they show big differences in quantitative details.
HK 9.19 Tue 10:30 Foyer Chemie
New chiral-symmetry-breaking operators in pseudoscalar QCD
sum rules — •Hilmar Forkel — Institut für Theoretische Physik,
Uni Heidelberg, Philosophenweg 19, 69120 Heidelberg
We introduce instanton-generated Wilson coefficients associated with
the leading chiral-symmetry-breaking operators in the operator product
expansion of the pseudoscalar correlator. The new contributions are fully
nonperturbative (both at soft and hard momenta) and supply previously
missing information about spontaneous chiral symmetry breaking which
reconciles the associated pseudoscalar sum rule with Goldstone’s theorem.
As a consequence, this sum rule becomes the first in its channel
which is able to reproduce the light mass scale of the pion, thereby resolving
a longstanding puzzle. Several predictions and structural insights
from the new sum rule are discussed.
HK 9.20 Tue 10:30 Foyer Chemie
Inequalities for the masses of the lightest ππ resonances in
large Nc QCD — •M.V. Polyakov 1,2 and V.V. Vereshagin 3
— 1 Petersburg Nuclear Physics Institute, 188350 Gatchina, Russia —
2 Institute for Theoretical Physics II, Ruhr University Bochum, 44780
Bochum, Germany — 3 Institute of Physics, St. Petersburg State University,
198504 St. Petersburg, Russia
We derive and analyse inequlities relating masses of the lightest ππ resonances
(ρ and σ) to coupling constants of the effective chiral lagrangian
in the limit of large number of colours.
HK 9.21 Tue 10:30 Foyer Chemie
Hard exclusive reactions with electroweak probes — •Jens
Ossmann — Institut fuer Theoretische Physik II, Ruhr-Universitaet
Bochum, 44780 Bochum
We show how modern neutrino beams from muon storage rings can be
used to aquire new information about generalized parton distributions in
not too far future.
In particular we study the reaction νµ + p → µ + + n + γ and compare
it with deeply virtual Compton scattering (DVCS) which is shortly
reviewed. Since this electroweak reaction can be described in terms of
generalized parton distributions it can be used to check the result from
DVCS. But due to its weak nature it is also a useful tool to explore new
kinematical regions.
HK 9.22 Tue 10:30 Foyer Chemie
The πA → ππA reaction — •Carsten Isselhorst, Zoheir Aouissat,
andJochen Wambach — Institut fuer Kernphysik Schlossgartenstr.9
64289 Darmstadt
Chiral symmetry and its restoration has attracted great interest from
experimental as well as theoretical side in the past few years.
Experiments done by the CHAOSCollaboration in 1996 have shown
an enhancement in the invariant mass spectrum of the πA → ππA reaction
near the two pion threshold. This has also been confirmed by
an experiment by the Crystal Ball collaboration. In the present talk we
try to connect this experimental results with partial restoration of chiral
symmetry. To achieve this we developed a model for the pion and its
chiral partner, the sigma meson, which preserves the constraints from
chiral symmetry. This leads to a strong reshapening of the Tππ scattering
matrix in the medium. This is then used to calculate the total and
differential cross section for the πA → ππA reaction and compared with
the CHAOSexperiment.
HK 9.23 Tue 10:30 Foyer Chemie
Six-quark dressed bag states in 2- and 3-nucleon systems
— •M.M. Kaskulov 1 , V.I. Kukulin 2 , and P. Grabmayr 1 —
1 Physikalisches Institut, Universität Tübingen — 2 Institute of Nuclear
Physics, Moscow State University
The recently developed two-component six-quark dressed-bag model
for the NN interaction is applied to electromagnetic processes on twoand
three-nucleon systems. It is our aim to employ this model for the
description of few-body systems and their response to the electromagnetic
fields. An important feature of the reaction model is the consistent
use of the short-range hadronic form factors with the cut-offs used in
the potential ansatz. Possibilities for new types of meson exchange currents
associated with chiral fields inside multi-quark dressed bag states in
nuclei are discussed. Specifically, results for capture and desintegration
reactions will be shown.
This work is supported by the DFG (SPP 1034)

Nuclear Physics Tuesday
HK 9.24 Tue 10:30 Foyer Chemie
Quark Loop Calculations of Electroweak Meson Observables in
a Covariant Bethe–Salpeter Model — •Matthias Koll, Ralf
Ricken, Bernard Metsch, andVladimir Hellmann — Institut
für Theoretische Kernphysik, Nußallee 14-16, D–53115 Bonn, Germany
We present recent theoretical results concerning electroweak processes
such as γγ decays of π 0 ,η,η ′ mesons, the so–called π2ℓγ/K2ℓγ decays
or scattering reactions like γπ → γπ and related processes. The basis
of our calculations is a relativistic quark model based on the instantanteous
Bethe–Salpeter equation; as quark–antiquark interactions, we
adopt a linearly rising confinement potential with a suitably chosen spinorial
structure plus a residual force induced by ’t Hooft’s instantons.
First, we present the results for the light meson spectrum where we
ultimately fix the few parameters of our model. We then discuss certain
decays of pseudoscalar mesons into non–hadronic final states and compare
the results with experimental data as well as with other theoretical
calculations. Finally, we study the relevance of pure quark box contributions
to processes like γγ → ππ or Compton scattering off pseudoscalar
mesons at low energies and present our lowest order results concerning
specific scattering reactions.
HK 9.25 Tue 10:30 Foyer Chemie
Coulomb effect in hard-photon proton-proton bremsstrahlung
— •R.G.E. Timmermans and T.D. Penninga — Theory group,
KVI, University of Groningen, Zernikelaan 25, 9747 AA Groningen, The
Netherlands
We study proton-proton bremsstrahlung near the end point of the photon
spectrum. The Coulomb interaction is treated exactly and highquality
pp potential models are used. The effect of the Coulomb force is
shown to be dramatic. Implications for experiment are discussed.
HK 9.26 Tue 10:30 Foyer Chemie
Final State Interaction Effects in Incoherent Photoproduction
of π-Mesons on the Deuteron — •Eed Darwish 1,2 , Hartmuth
Arenhövel 1 ,andMichael Schwamb 1 — 1 Institut für Kernphysik, J.
Gutenberg-Universität, J.-J. Becher-Weg 45, D-55099 Mainz, Germany
— 2 Physics Department, Faculty of Science, South Valley University,
Sohag, Egypt
Incoherent photoproduction of pions on the deuteron in the ∆(1232)
resonance region is investigated with inclusion of nucleon-nucleon (NN)
and pion-nucleon (πN) rescattering. The elementary γN → πN production
amplitude contains besides the standard pseudovector Born terms
the resonance contribution from the ∆(1232) excitation [1].
The major point of concern is the inclusion of NN and πN rescattering
which we limit to contributions of two-particle interactions in the
NN-andπN-subsystems. As models for the interaction of the NN-and
πN-subsystems we use separable interactions from Haidenbauer et al. [2]
and Nozawa et al. [3], respectively.
In general, the inclusion of final state interaction effects is found to
be important in the total and differential cross sections. Moreover, they
lead to an improved agreement with the existing experimental data.
[1] R. Schmidt et al., Z.Phys.,A355 (1996), 421
[2]J.Haidenbaueret al., Phys.Rev.,C30 (1984), 1822
[3] S. Nozawa et al., Nucl. Phys., A513 (1990) 459
HK 9.27 Tue 10:30 Foyer Chemie
Two and Three Neutron Halos in Helium and Lithium Isotope
— •M. Tomaseli 1,2 , T. Kuehl 2 , P. Egelhof 2 , W. Noertershaeuser
2 , A. Dax 2 , H. Wang 2 , D. Marx 2 , S.R. Neumaier 2 ,
H.-J. Kluge 2 , I. Tanihata 3 , S.Fritzsche 4 ,andM. Muttere 1 —
1 Institute of Nuclear Physics, Darmstadt University, D-64289 Darmstadt,
Germany — 2 Gesellschaft fuer Schwerionenforschung (GSI), D-64291
Darmstadt, Germany — 3 RIKEN 2-1 Hirosawa, Wako-Shi, Saitama 351-
0198, Japan — 4 Institute of Physics, Kassel University, D-34132 Kassel,
Germany
The far reaching shape of the matter distributions (halo) of exotic
nuclei with high isospin components is calculated in the Dynamic Correlation
Model (DCM) which is based on the interaction of valence- and
core-particles. In this model, one, two, or more valence particles and
intrinsic vacuum-clusters (collective-excitations of reference vacuum) are
treated within the same formalism. Matter and charge distributions of
lithium and beryllium isotopes are strongly modulated by the couplig of
the valence particles with the core and the matter radii extracted from
the theoretical distributions are in good agreement with experimental
results. Within the model the core-protons are de facto contributing to
the halo formation. The effect of the core excitation mechanism on the
calculated cross sections for proton scattering on helium and lithium isotopes
is analysed. For the charge radii new experiments based on the
determination of the volume-shift are discussed
HK 9.28 Tue 10:30 Foyer Chemie
Three quark correlations in hot and dense nuclear matter —
•Michael Beyer 1 , Stefano Mattiello 1 , Tobias Frederico 2 ,
and Hans J Weber 3 — 1 FBPhysik,U.Rostock,Germany— 2 Sao
Paulo, Inst. Tech. Aeronautics, Brazil — 3 U of Virginia, Charlottesville,
USA
We investigate the transition region from quark to nuclear matter at
high densities and temperatures as it might be relevant for highly relativistic
heavy ion collisions. To this end, we present a relativistic threebody
equation to investigate three-quark clusters in hot and dense quark
matter. To derive such an equation we use the Dyson equation approach.
The equation systematically includes the Pauli blocking factors as well as
the self energy corrections of quarks. Special relativity is realized through
the light front form. Presently we use a zero-range force and investigate
the Mott transition.
References
M. Beyer, S. Mattiello, T. Frederico, H.J. Weber, Phys. Lett. B521
(2001) 33; S. Mattiello, M. Beyer, T. Frederico, H.J. Weber, Few-Body
Systems in print.
HK 9.29 Tue 10:30 Foyer Chemie
The Jülich pion-nucleon model — •Achot M. Gasparyan , Johann
Haidenbauer, Christoph Hanhart, andJosef Speth —
FZ Jülich, IKP, 52425 Jülich
The coupled channel model of the πN interaction developed by the
Jülich group [1] yields a quite satisfactory description of the πN phase
shifts and inelasticities as well as of the ηN differential and total cross
sections in the energy range from the πN threshold up to about 1600
MeV. Presently we are extending this model to higher energies and we
will report corresponding results at this meeting.
For the extension to higher energies further channels like KΛ, KΣ,
and ωN (which open at center of mass energies within the region 1600-
1700 MeV) have to be included. In addition, contributions from several
pole diagrams, in particular of the S31(1620), P 13(1720) and D33(1700)
resonances, are considered.
[1] O. Krehl et al., Phys. Rev. C 62, 025207 (2000).
HK 9.30 Tue 10:30 Foyer Chemie
The influence of three body cuts on the reaction NN → NNx—a
toy model study — •Andreas Motzke 1 , Charlotte Elster 1,2 ,
Christoph Hanhart 1 ,andJosef Speth 1 — 1 Institut für Kernphysik
(Theorie), Forschungszentrum Jülich, D-52425 Jülich — 2 Department of
Physics and Astronomy, Ohio University, Athens, OH 45701
In recent years there is an increasing interest in meson production reactions
in NN collisions. High quality data is available for a large number
of different mesons. Unfortunately, several theoretical issues are still to
be investigated in detail. One of those is the impact of three body cuts
on the reaction cross sections. In this talk we will study the significance
of NNπ–cuts on the reaction NN → NNx within a toy model
developed in Ref. [1]. We discuss the numerical methods used and compare
the exact results to several approximations used in the literature. [1]
C.Hanhart, G.A.Miller, F.Myhrer, T.Sato, and U.van Kolck, Phys.Rev.C
63(2001)044002.

Nuclear Physics Tuesday
HK10 Poster Session: Nuclear Physics/Spectroscopy
Time: Tuesday 10:30–12:45 Room: Foyer Chemie
HK 10.1 Tue 10:30 Foyer Chemie
Investigation of nuclear structures in 124 Xe * — •B. Saha 1 ,
A. Dewald 1 , O. Möller 1 , R. Peusquens 1 , A. Fitzler 1 , T.
Klug 1 , I. Schneider 1 , D. Tonev 1 , K. Jessen 1 , K.O. Zell 1 , P.
von Brentano 1 , and B.J.P. Gall 2 — 1 Institut für Kernphysik,
Universität zu Köln, Köln, Germany — 2 IReS, UMR7500IN2P3-CNRS,
Université Louis Pasteur, Strasbourg, France
The so-called magnetic rotation which appears in the spectra as regular
M1 bands is now a well established excitation mode seen in several lead
isotopes. It is still not clear whether it also exists in the A=130 region
where similar M1 bands are known, e.g in 124 Xe [1] and 128 Ba. Crucial
experimental observables are the B(M1) values which are expected to
decrease with increasing spin. Therefore we performed a recoil distance
measurement (RDM) with the EUROBALL spectrometer at Strasbourg
and the Köln plunger using the reaction 110 Pd( 18 O,4n) 124 Xe at a beam
energy of 86 MeV. Lifetimes of levels of the ground state band (gsb) as
well as of the M1 band could be determined with γ-γ-coincidence data.
By gating from above the levels of interest, problems due to the feeding
histories of the levels could be avoided. The experimental setup will be
presented and the deduced transition probabilities will be used to interprete
the nuclear structures of 124 Xe. Especially the bandcrossing of the
gsb with the (νh11/2) 2 and (πh11/2) 2 s-bands will be discussed.
[1] I. Schneider et al., Phys.Rev.C60, 014312 (1999)
The authors would like to acknowledge the support provided by the
EUROBALL team.
*supportedbyBMBF,ProjectNo.06OK958
HK 10.2 Tue 10:30 Foyer Chemie
Electronic timing technique and transition probabilities
in 136Nd — •Oliver Möller1 , A. Dewald1 , A. Fitzler1 , I.
Schneider1 , G. Kemper1 , K.O. Zell1 , P. von Brentano1 , J.
Jolie1 , R. Krücken2 , D. Bazzacco3 , and C. Rossi-Alvarez3 — 1Institut für Kernphysik, Universität zu Köln, Köln, Germany —
2 3 AWWNSLab, Yale University, CT, 06520 USA — Dip. di Fisicia,
Universita Padova, Italy
The beam pulsing system at the Cologne FN Tandem accelerator has
been used to measure lifetimes of excited states in 46V, 54Co and 136Nd in
the nanosecond and sub-nanosecond range. A new program for the data
analysis was developed that reproduces the time spectra of the transitions
of interest by using the measured time spectrum of a γ-line of similar
energy as a prompt reference. In addition lifetimes of excited states of
136Nd, measured with EUROBALL spectrometer at Legnaro using the
recoil distance method (RDM), will be presented. The deduced B(E2)values
including the B(E2;10 + → 8 + ) value obtained with the electronic
timing technique will be used to discuss the interaction of the ground
state band with two s-bands. *supported by BMBF; Project No. 06 OK
958
HK 10.3 Tue 10:30 Foyer Chemie
Photo-induced population of the h 11/2 isomers in 135,137Ba —
•H. von Garrel1 , D. Belic1 , P. von Brentano2 , C. Fransen2 ,
A. Gade2 , U. Kneissl1 , C. Kohstall1 , M. Kreutz1 , A. Linnemann2
, H.H. Pitz1 , M. Scheck1 , F. Stedile1 ,andV. Werner2 —
1 2 Institut für Strahlenphysik, Universität Stuttgart, Stuttgart — Institut
für Kernphysik, Universität zu Köln, Köln
Photoactivation and photon scattering experiments have been performed
at the Stuttgart bremsstrahlung facility on 135,137Ba to investigate
the nuclear structure and isomer population near the N=82 shell
closure. The combination of these methods can give valuable model independent
information, especially lifetimes of the populating levels and
the branching ratio Γiso/Γ0 [1]. For 135Ba in the photoactivation experiments
five intermediate states (IS) have been found in the energy range
1.3-2.6 MeV populating the 28.7 h isomer at 268 keV. For three of them
dipole-excited states can be suggested from the NRF measurements with
2.5 MeV bremsstrahlung endpoint energy. For 137Ba three IShave been
found in photoactivation of the 662 keV, 2.55 min. isomer in the energy
range of 2.2-3.2 MeV. From NRF also three levels can be ascribed to
these IS. The results of the measurements are discussed and compared
with theoretical calculations.
[1] D. Belic et al., Nucl. Instr. a. Meth. A 463 (2000) 26-41.
HK 10.4 Tue 10:30 Foyer Chemie
The influence of the N =50neutron-core on dipole excitations
in 87 Rb — •L. Käubler 1 , K.D. Schilling 1 , R. Schwengner 1 , D.
Belic 2 , P. v. Brentano 3 , F. Dönau 1 , C. Fransen 3 , M. Grinberg
4 , E. Grosse 1 , U. Kneissl 2 , C. Kohstall 2 , A. Linnemann 3 ,
P. Matschinsky 3 , A. Nord 2 , N. Pietralla 3 , H.H. Pitz 2 , M.
Scheck 2 , F. Stedile 2 ,andV. Werner 3 — 1 Inst. f. Kern- und Hadronenphysik,
FZ Rossendorf, 01314 Dresden — 2 Inst. f. Strahlenphysik,
Uni Stuttgart, 70569 Stuttgart — 3 Inst. f. Kernphysik, Uni zu Köln,
50937 Köln — 4 Inst. f. Nuclear Research and Nuclear Energy, Sofia,
BG-1784 Sofia
Dipole excitations in the semimagic N=50 nucleus 87 Rb were investigated
at the Stuttgart Dynamitron facility using bremsstrahlung with
an endpoint energy of 4.0 MeV. The magnetic dipole excitations are well
reproduced in the framework of the shell model, however, these calculations
cannot describe the observed electric dipole excitations. The 1/2 +
state at 3060 keV is proposed to be the weak coupling of an f5/2 proton
hole to the 3 − octupole vibrational state in the N =50core 88 Sr. The
relatively strong E1 transition from that state to the ground state is explained
as mainly the neutron h11/2 → g9/2 transition. The breakup of
the N = 50 core and neutron excitations into the h11/2 shell are essential
to describe electric dipole excitations, but neutron-core excitations
do not play an important role for the structure of magnetic dipole excitations.
∗ Supported by the DFG, contracts Br-799/9, Gr-1674/1-1 and
Kn-154/30, and the SMWK, contract 7533-70-FZR/702.
HK 10.5 Tue 10:30 Foyer Chemie
High-spin structure of the spherical nucleus 90 Y ⋆
— •R. Schwengner 1 , G. Rainovski 1,2 , K.D. Schilling 1 , A.
Wagner 1 , A. Jungclaus 3 , E. Galindo 4 , O. Thelen 5 , D.R.
Napoli 6 , C.A. Ur 7 , G. de Angelis 6 , M. Axiotis 6 , A. Gadea 6 , N.
Marginean 6 , T. Martinez 6 ,andT. Kröll 7 — 1 FZ Rossendorf —
2 INRNE Sofia — 3 Universidad de Madrid — 4 Universität Göttingen
— 5 Universität Köln — 6 INFN, LN Legnaro — 7 INFN, Università di
Padova
High-spin states in 90 Y were populated in the 82 Se( 11 B,3n) reaction
at a beam energy of 37 MeV using the XTU tandem accelerator of the
Legnaro National Laboratory. Gamma rays were detected with the spectrometer
GASP. The level scheme of 90 YwasextendeduptoJ π =(18 + )
at 9.6 MeV. Mean lifetimes of four levels were determined using the
Doppler shift attenuation method. The structure of 90 Y was interpreted
in terms of the shell model. The calculations were performed in the
model space π(0f5/2, 1p3/2, 1p1/2, 0g9/2) ν(1p1/2, 0g9/2, 1d5/2) aswellasin
an extended space including the ν(0g7/2) orbital. The calculations in the
extended model space reveal a correspondence between states in 90 Yand
89 Y. Moreover, it is possible to assign a sequence of the predicted states
with J π ≥ 14 (+) that reproduces the experimental B(M1) values of up
to about 1 W.u.
⋆ Supported by the European Commission and the Saxon Ministry of
Sciences and Arts.
HK 10.6 Tue 10:30 Foyer Chemie
Acquisition of Data from Digital Electronics for a Large Ge Array
— •N. Warr, J. Eberth, G. Pascovici, andD. Weißhaar for
the Miniball collaboration — Institut für Kernphysik, Zülpicherstr. 77,
D-50937 Köln, Germany
Modern arrays for γ-ray spectroscopy typically have over a 100 channels
and require special data acquisition systems. The current trend
towards position sensitivity through pulse-shape analysis and eventually
to γ-ray tracking imposes the use of digital electronics. We report on
the successful implementation of such a system, using commercial digital
electronics for Miniball which already has 126 Ge channels.
Each Miniball triple cluster has three 6-fold segmented Ge detectors
which yield 7 signals (core and 6 segments). 36 camac-based DGF cards
supplied by Xia are used for the six triple clusters of phase I. The data
are buffered by the DGF cards and transferred to a PC using a block
mode fast camac transfer by one PCI-based camac crate controller for
each crate. The camac crates are read out in parallel, so there is little increase
in dead time as more crates are added when using a multiprocessor
PC.

Nuclear Physics Tuesday
A complete spectrometer also requires ancillary detectors and although
the simplest method is to use the same digital electronics for the ancillary
detectors, this may be an expensive option if traditional electronics
is already available. To circumvent this problem, we have conceived a
method to use a single DGF card together with traditional analogue electronics,
where the DGF card provides a timestamp for the analogue data
which is read out in the conventional way.
Funded by BMBF under contract no. 060K958.
HK 10.7 Tue 10:30 Foyer Chemie
Picosecond lifetime determination in the mirror nuclei 47Cr and
47V — •Dimitar Tonev 1 , Pavel Petkov 1,2 , Alfred Dewald 1 ,
Silvia Lenzi 3 , Daniel R. Napoli 4 , Ventseslav Andrejtscheff 2 ,
and Peter von Brentano 1 — 1 Institut fuer Kernphysik, der Universitaet
zu Koeln, Zuelpicherstr 77, 50937 Koeln, Deutschland — 2 Bulgarian
Academy of Sciences, Institute for Nuclear Research and Nuclear Energy,
1784 Sofia, Bulgaria — 3 Dipartimento di Fisica and INFN, Sezione
di Padova, Padova, Italy — 4 INFN, Laboratory Nazionali di Legnaro,
Legnaro, Italy
Lifetime measurements in the mirror nuclei 47Cr and 47V are performed
by means of the Doppler-shift attenuation method using the multidetector
array EUROBALL. The determined transition strengths in the
yrast cascades are well described by full pf-Shell model calculations and
the behaviour of the transition quadrupole moments with increasing spin
confirms the nuclear structure and shape changes inferred in earlier works
investigating Coulomb energy differences (CED).
HK 10.8 Tue 10:30 Foyer Chemie
Transition Matrix Elements in Neutron-rich Fission Fragments
— •C. Hutter 1,2 , R. Krücken 1 , J.R. Cooper 1,3 , C.J. Barton 1 ,
C.W. Beausang 1 , M. Caprio 1 , R.F. Casten 1 , W.-T. Chou 1 ,
A.A. Hecht 1 , N. Pietralla 1,4 , N.V. Zamfir 1 , A. Aprahamian 5 ,
M. Shawcross 5 , D. Cline 6 , C.Y. Wu 6 , K.E. Gregorich 7 , R.M.
Clark 7 , A.O. Macchiavelli 7 , M. Stoyer 3 , and A. Zilges 2 —
1 WNSL-Yale University — 2 Institut für Kernphysik, Technische Universität
Darmstadt — 3 Lawrence Livermore National Laboratory —
4 Institut für Kernphysik, Universität zu Köln — 5 Notre Dame University
— 6 University of Rochester — 7 Lawrence Berkeley National Laboratory
In view of the prospects of studying neutron-rich nuclei far from stability
using RIBs it is important to get structural information on those
nuclei already accessible today by means of spectroscopy following fission.
The systematic knowledge of transition matrix elements in these nuclei is
key to observe modifications off the shell structure of nuclei far from stability.
In this contribution we report on a recoil distance Doppler shift
experiment using Gammasphere and the New Yale Plunger Device to
measure lifetimes of excited states in neutron rich nuclei produced in the
fission of 252 Cf. Fission fragments emitted in a cone of ± 20 ◦ from a thin
50 µCi 252 Cf source were detected by a set of photo cells. Complementary
fragments were stopped in a gold stopper after traveling a variable distance.
Gamma rays in coincidence with fission fragments were detected
by the Gammasphere array. First results for A≈ 100 and 140 nuclei will
be presented. Supported by the U.S. DOE (DE-FG02-91ER-40609) and NSF, and
the German DFG under contract No.Pi 393/1.
HK 10.9 Tue 10:30 Foyer Chemie
New g factor measurement of the 44 Ca(2 + 1 ) state + — •S.
Schielke 1 , K.-H. Speidel 1 , O. Kenn 1 , J. Leske 1 , G. Müller 1 ,
and J. Gerber 2 — 1 Institut für Strahlen- und Kernphysik, Univ.
Bonn, D-53115 Bonn — 2 Institut de Recherches Subatomiques, F-67037
Strasbourg, France
In view of the precise g(2 + 1 ) values obtained for Ti and Cr isotopes [1]
suggesting considerable excitations of protons and neutrons of the 40 Ca
core to fp shell orbits the first 2 + states of Ca isotopes should show a
similar behaviour. However, from an early measurement on 44 Ca [2] the
g(2 + 1 ) value was found to be negative indicating a dominant f7/2 neutron
component in the wave function. We have remeasured this g factor
by employing projectile Coulomb excitation in inverse kinematics combined
with the transient field technique. A 44 Ca beam provided by the
Cologne tandem accelerator was Coulomb excited by scattering from a
carbon target. The g factor was derived from spin precessions in ferromagnetic
Gd. Contrary to [2] the newly determined g factor is definitely
positive indicating collective admixtures due to core excitation.
+ supported by DFG
[1] R. Ernst et al., Phys. Rev. Lett. 84 (2000) 416
[2] Y. Niv et al., Phys. Rev. Lett. 43 (1979) 326
HK 10.10 Tue 10:30 Foyer Chemie
Search for hyperdeformation in the A ≈ 125 region∗ — •J. Domscheit1 , H. Amro2 , R. Clark3 , M. Cromaz3 , P. Fallon3
, A. Görgen3 , G.B. Hagemann4 , B. Herskind4 , H. Hübel1 ,
D.R. Jensen4 , I.Y. Lee3 , W.C. Ma2 , A.O. Macchiavelli3 , D.
Ward 3 , and J.N. Wilson4 — 1ISKP Univ. Bonn, Germany —
2 3 4 Mississippi State Univ., USA — LBNL, Berkeley, USA — NBI, Copenhagen,
Denmark
The compound nucleus 128Ba was produced in the symmetric reaction
64Ni + 64Ni at a bombarding energy of 265 MeV at the 88-Inch
cyclotron in Berkeley. This reaction was chosen in order to populate
high-spin states with large deformation at relatively low excitation energy.
Gamma-ray coincidences were measured with the Gammasphere
spectrometer. The strongest exit channels and their relative intensities
were: 122Xe (100), 124Ba (98), 125Ba (62), 125Cs (24) and 123Ba (7). A
search was peformed for regular sequences of discrete transitions using
different approaches, but up to date no hyperdeformed bands (axis ratio
≈ 3:1) could be established. Two different search routines are presented
and the limits for the detection of regular sequences are discussed. The
data were also used to extend and correct the previously known level
scheme of 125Cs [1,2].
[1] J.R. Hughes et al., Phys. Rev. C 44 (1991) 2390
[2] D. Ward, AIP Conf. Proc. 259 (1992) 358
∗Work supported by BMBF, Germany (contract no 06 BN 907)
HK 10.11 Tue 10:30 Foyer Chemie
High-spin spectroscopy in 161,162 Lu ∗ — •P. Bringel 1 , J. Domscheit
1 , H. Hübel 1 , A. Neusser 1 , G. Schönwasser 1 , A.K. Singh 1 ,
G.B. Hagemann 2 , D.R. Jensen 2 , D. Bazzacco 3 , S. Lunardi 3 , M.
Axiotis 4 , Th. Kröll 4 , D.R. Napoli 4 , C. Ur 4 , H. Amro 5 , S.C.
Pancholi 6 , R. Bhowmik 7 , S. Bhattacharya 8 ,andC. Petrache 9
— 1 ISKP, Univ. Bonn, Germany — 2 NBI, Copenhage, Denmark —
3 INFN e Dipart. di Fisica, Padova, Italy — 4 INFN,LNL,Legnaro,Italy
— 5 Dep. of Physics, Mississippi State University, USA — 6 Dep. of
Physics & Astronomy, Dehli University, Dehli, India — 7 Nuclear Science
Centre, New Dehli, India — 8 SINP, Calcutta, India — 9 Univ. di
Camerino, Italy
Triaxial superdeformation (TSD) has recently been established in Lu
and Hf isotopes in the mass 165 region. The aim of this work is to
search for the predicted TSD in 161 Lu and 162 Lu. High-spin states in
these nuclei have been populated in the r eaction 100 Mo( 65 Cu,xn) at 260
MeV beam energy at the Legnaro Tandem accelerator. Gamma-ray coincidences
have been measured with the GASP array. The data permit
an extension of all the known normal-deformed (ND) bands in 161,162 Lu.
The searc h for TSD is in progress.
∗ Work supported by BMBF (Contract no. 06 BN 907) and by DFG
(Contract no. Hu 325/10)
HK 10.12 Tue 10:30 Foyer Chemie
Photon scattering on 98Mo ⋆
— •G. Rusev1,2 , R. Schwengner1 , F. Dönau1 , L. Käubler1 , S.
Mallion1 , K.D. Schilling1 , A. Wagner1 , H. von Garrel3 , U.
Kneißl3 , C. Kohstall3 , M. Kreutz3 , H.H. Pitz3 , M. Scheck3 ,
and F. Stedile3 — 1Inst. für Kern- und Hadronenphysik, FZ
Rossendorf — 2INRNE Sofia — 3IfS, Universität Stuttgart
We present results of the first photon-scattering experiment on the
nuclide 98Mo. This experiment was carried out at the bremsstrahlung
facility of the Stuttgart Dynamitron accelerator at an electron energy of
3.8 MeV. Photons scattered from a 98Mo target with a mass of 1998 mg,
enriched to 98.55%, were measured with three HPGe detectors placed
at 90◦ , 127◦ and 150◦ , respectively, to the incident photon beam. We
identified five states with J = 1 in the energy range from 2.8 to 3.6 MeV.
A state at about 2.8 MeV is a candidate for the [2 + ⊗ 3− ] 1− two-phonon
excitation while states with 3.2 to 3.6 MeV may be considered as J π =1 +
states. An analogous experiment was carried out for the nuclide 100Mo and is also being analysed.
⋆ Supported by the DFG under contract no. Do 466/1-1.
HK 10.13 Tue 10:30 Foyer Chemie
Structure studies in odd-A iodine nuclei — •Hariprakash
Sharma 1,2 and P. Banerjee 3 — 1 University of Kalyani, Kalyani-741
235, India — 2 Forschungszentrum Rossendorf, PF 510119, 01314
Dresden, Germany — 3 Saha Institute of Nuclear Physics, 1/AF Bidhan
Nagar,Calcutta-700 064, India

Nuclear Physics Tuesday
Recent experimental data on odd-mass iodine isotopes (A=119-125)
have revealed several interesting structural features. These include the
observation of coexistence of prolate and oblate bands with similar proton
configurations, three quasi-particle bands, signature inversion in yrast
positive-parity bands, shape coexistence. Presently particle rotor model
calculations have been performed for the πh11/2, πg9/2 and πg7/2 bands
in 121,123,125 I using an axially symmetric deformed Nilsson potential. The
calculations reproduced the experimental results well and predict a moderate
quadrupole deformation ∼0.2 for these bands.
Work supported by BRNS-DAE under project number 99/37/30 and
BRNS/822.
HK 10.14 Tue 10:30 Foyer Chemie
γ-spectroscopic study of spin-isospin giant resonances in 208Bi —
•A. Krasznahorkay1,2 , A.M. van den Berg2 , S. Brandenburg2 ,
M. Csatlós1 , M. Fujiwara3,4 , V. Hannen2 , M. N. Harakeh2 , J.
Gulyás1 , F. Ihara4 , Z. Máté1 ,andR. Zegers2 — 1Institute of Nuclear
Research (ATOMKI) Debrecen, Hungary — 2KVI, Groningen, The
Netherlands — 3RCNP, Osaka, Japan — 4JAERI, Tokai, Japan
Spin-isospin giant resonances have been excited in 208Bi using the
208 3 Pb( He,t) reaction and the γ-decay of the states has been investigated
in order to get a deeper insight into the microscopic structure of
the spin-dipole (SD) and Gamow-Teller (GT) excitations and Isobaric
Analogue States (IAS).
The experiments were carried out at the KVI using 177 MeV 3He beams from the AGOR superconducting cyclotron. The energy of the
tritium ejectiles was analyzed by the BBSmagnetic specrometer, which
was set at zero degree with respect to the beam direction, while the energy
of the γ-rays was measured with a large NaI detector equipped with
anticoincidence shield.
We could observe transitions for the first time both from the SD and
GT resonances to low-lying states with well defined particle-hole configurations.
HK 10.15 Tue 10:30 Foyer Chemie
Investigation of the 1S0 n-n FSI using the d(d, 2He) 2nreaction-a technique to measure the n-n scattering length — •C. Bäumer1 ,
A.M. van den Berg2 , N. Blasi3 , B. Davids2 , D. Frekers1 , D.
De Frenne4 , E. Grewe1 , M. Hunyadi2 , M.A. de Huu2 , E. Jacobs4
, B. Junk1 , A. Negret4 , S.Rakers1 , R. Schmidt1 ,andH.J.
Wörtche2 — 1Westfälische Wilhelms-Universität Münster, Germany —
2 3 Kernfysisch Versneller Instituut, Groningen, The Netherlands — INFN
Milano, Italy — 4Universiteit Gent, Belgium
The cross section for the d(d, 2He) 2n reaction at Ed=170 MeV and
small momentum transfer has been measured. The experiment was carried
out at the AGOR facility of the KVI (Groningen/NL). The two
correlated protons of the 2He were momentum analyzed with the BBS
magnetic spectrometer and detected in coincidence by the ESN-detector.
An energy resolution of 140 keV was achieved.
The (d, 2He) reaction is used to map out the 2nsystemwithhighpreci sion. In the region of lowest momentum transfer the reaction is mediated
by the Gamow-Teller transition operator which excites the di-neutron
system predominantly into the 1S0 state. In the region of low internal
momentum of the 2n system the shape of the 1S0 final-state interaction
gives quantitative information about the neutron-neutron scattering
length ann.
In this talk preliminary results are presented and the advantages of the
d(d, 2He) 2n reaction over similiar approaches to extract ann are discussed.
HK 10.16 Tue 10:30 Foyer Chemie
Measurement of the M1 and M2 spin-flip strength distribution
in 48 Ca — •N. Blasi 1 , C. Bäumer 2 , A.M. van den Berg 3 ,
R. Bieber 3 , D. Frekers 2 , M. Hagemann 4 , V.M. Hannen 3 , M.N.
Harakeh 3 , J. Heyse 4 , F. Hofmann 5 , M.A. de Huu 3 , E. Jacobs 4 ,
Y. Kalmykov 5 , B.A.M. Krüsemann 3 , P. von Neumann-Cosel 5 ,
S.Rakers 2 , B. Reitz 5 , A. Richter 5 , R. Schmidt 2 , K. Schweda 5 ,
A. Shevchenko 5 ,andH.J. Wörtche 3 — 1 INFN, Milano (It) — 2 IKP,
Münster (De) — 3 KVI, Groningen (Nl) — 4 Universiteit Gent (B) —
5 IKP, Darmstadt (De)
Polarization transfer observables in intermediate energy proton-nucleus
scattering carry important information about details of the nuclear structure,
which in many cases are difficult to extract otherwise. We have
started to measure the transverse spin-flip probability Snn with highest
precision and statistics in 48 Ca scattering in order to disentangle the
isovector spin-M1 and spin-M2 resonances. Of course, for further elucidation
of the dynamics of spin magnetization, (e,e ′ )-measurements are
also required to provide additional clues for a consistent interpretation.
Our first measurements were done on 48 Ca at the focal-plane polarimeter
set-up of the AGOR BBSmagnetic spectrometer at the KVI using
polarized protons at 174 MeV. Spectral resolution of order 100 keV was
achieved, and Snn spectral functions of 250 keV bin size allow a first
insight into details of the nuclear response. The poster will describe
the novel techniques of the measurement and present various results. It
will also describe some of the potentials for future measurements of spin
observables at intermediate energies using the present facility.
HK 10.17 Tue 10:30 Foyer Chemie
Side-feeding pattern investigation in the 114Cd( 36S,xn) and
100 48 1,2 1 Mo( Ti,xn) reactions — •A.A. Pasternak , W. Gast , H.M.
Jäger1 , L. Mihailescu1 , R.M. Lieder1 , E.O. Podsvirova1,2 , D.
Bazzacco3 , R. Menegazzo3 , S. Lunardi3 , C. Rossi Alvarez3 ,
G. de Angelis4 , E. Farnea4 , A. Gadea4 , D.R. Napoli4 , T.
Rza¸ca-Urban5 ,andW. Urban5 — 1IKP, FZ Jülich, D-52425 Jülich
— 2A.F. Joffe PTI, RU-194021 St. Petersburg — 3INFN, Sezione di
Padova, I-35131 Padova — 4INFN, LNL, I-35020 Legnaro — 5IEP, Univ. Warsaw, PL-00-681 Warsaw
A new approach for the investigation of continuum γ-ray cascades has
been developed based on Monte-Carlo simulations of entry-state population
distributions and the deexcitation of the entry states. The aim
is to fit simultaneously different types of experimental data, viz. statistical
distributions of γ-ray cascades like γ-multiplicity distributions and
DSA γ-ray lineshapes, being sensitive to the time-distribution of the sidefeeding
cascades. In the deexcitation process stretched E2 bands (including
rotational damping) and statistical E1, M1 and E2 transitions have
been considered. For the near-magic nuclei 142−146Gd also superdeformed
bands (SDB) and magnetic rotational bands have been taken into account.
Fold distributions for the 114Cd( 36S,xn) 144,145,146Gd (E=182MeV)
and 100Mo( 48Ti,xn) 143,144,145Gd (E=215 MeV) reactions measured with
GASP have been fitted. For the case of 114Cd( 36S,6n) 144Gd side-feeding
time distributions have been calculated with the same fit parameters. Experimental
DSA lineshapes can be reproduced assuming a considerable
number of SDB in the continuum.
HK 10.18 Tue 10:30 Foyer Chemie
Fusion to superheavy nuclei and quasifission in the dinuclear
model — •T.M. Shneidman1,2 , G.G. Adamian1,2,3 , N.V. Antonenko1,2
, and W. Scheid1 — 1Institut für Theoretische Physik der
Justus-Liebig-Universität, D-35392 Giessen, Germany — 2Joint Institute
for Nuclear Research, 141980 Dubna, Russia — 3Institute of Nucear
Physics, Tashkent 702132, Uzbekistan
The dinuclear system concept is used to describe the evaporation
residue cross sections for the production of superheavy nuclei and charge
and mass distributions from quasifission in the same reactions. Th dinuclear
system evolves to fusion by the transfer of nucleons between the
clusters and decays with some probability into fragments with a given
mass and charge asymmetry which is the quasifission. Calculated evaporation
residue cross sections and mass and charge distributions from
quasifission are compared with available data from experiments at JINR
in Dubna and at GSI in Darmstaft.
Supported by BMBF and Volkswagen Stiftung.
HK 10.19 Tue 10:30 Foyer Chemie
Fusion to superheavy nuclei and quasifission in the dinuclear
model — •T.M. Shneidman 1,2 , G.G. Adamian 1,2,3 , N.V. Antonenko
1,2 , 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 — 3 Institute of Nucear
Physics, Tashkent 702132, Uzbekistan
The dinuclear system concept is used to describe the evaporation
residue cross sections for the production of superheavy nuclei and charge
and mass distributions from quasifission in the same reactions. The dinuclear
system evolves to fusion by the transfer of nucleons between the
clusters and decays with some probability into fragments with a given
mass and charge asymmetry which is the quasifission. Calculated evaporation
residue cross sections and mass and charge distributions from
quasifission are compared with available data from experiments at JINR
in Dubna and at GSI in Darmstadt.
Supported by BMBF and Volkswagen-Stiftung.

Nuclear Physics Tuesday
HK 10.20 Tue 10:30 Foyer Chemie
M1 and M2 modes in 180 ◦ electron scattering at the S-DA-
LINAC ⋆ — •Y. Kalmykov 1 , A. Dzhioev 2 , N. Goncharova 2 , F.
Hofmann 1 , H. Lenske 3 , P. von Neumann-Cosel 1 , B. Reitz 4 , A.
Richter 1 , and J. Wambach 1 — 1 Institut für Kernphysik, Technische
Universität Darmstadt — 2 Institute of Nuclear Physics, Moscow
State University, Russia — 3 Institut für Theoretische Physik, Universität
Giessen — 4 Jefferson Lab., Newport News, USA
Electron scattering at 180 ◦ is a proven technique for investigating magnetic
excitations of nuclei. Two projects have been performed recently
with the 180 ◦ system at the S-DALINAC: investigations of M1 and M2
transitions in self-conjugate sd-shell nuclei and M2 transitions in the
medium-heavy nucleus 58 Ni. The high experimental sensitivity allows
studies of subtle effects like isospin mixing in isoscalar M1 transitions [1].
The deduced M2 strength distributions in 24 Mg, 28 Si and 32 Sare compared
to a particle core coupling-type of shell model calculation. The
comparison of the extracted M2 strength distribution in 58 Ni and the
spin-dipole strength deduced from a (�p,�p ′ ) experiment at KVI indicates
the presence of large orbital contributions which are interpreted as the
twist mode in nuclei [2]. This finding is corroborated by QPM calculations
including the coupling to complex degrees of freedom.
⋆ Supported by the DFG under contract FOR 272/2-1.
[1] F. Hofmann et al., Phys. Rev. C , in press.
[2] B. Reitz et al., Phys. Lett. B , submitted.
HK 10.21 Tue 10:30 Foyer Chemie
The Neutron Decay Spectrometer ”aspect” — •S .Baeßler 1 , F.
Glück 1 , J. Byrne 2 , M.G.D. van der Grinten 2 , F.J. Hartmann 3 ,
W. Heil 1 , G. Pezoldt 3 ,andO. Zimmer 3 — 1 Institut für Physik,
University of Mainz, Germany — 2 School of Chemistry, Physics and Environmental
Sciences, University of Sussex, Brighton, UK — 3 Physik
Department E18, TU München, Germany
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 are 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 electron
neutrino 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. Details
can be found in [1].
[1] O. Zimmer et al., NIM A 440 (2000) 548
HK 10.22 Tue 10:30 Foyer Chemie
Hyperfinestructure, Isotope- and Isomer- shift of neutron rich
Sn isotopes up to the doubly magic 132-Sn — •Jens Lassen,
Roland Horn, andGerhard Huber for the COMPLIScollaboration
and the CERN-ISOLDE collaboration — Inst. für Physik, EXAKT,
Johannes Gutenberg-Universität
Neutron rich isotopes are produced at CERN-ISOLDE by means of
proton induced fission of 238-U. These isotopes are extraced as an ion
beam and are supplied to the experiments after mass separation. For
neutron rich Sn-isotopes a strong isobaric contamination, e.g. Te and
Cs is present. Therefore COMPLIS, an additional element- and isotopeselective
secondary, pulsed laser ion-source is used for the spectroscopy
of neutron-rich Sn isotopes [1]. COMPLIS is based on inplantation of
the primary ISOLDE ion beam into a grafite target, subsequent laserdesorption
followed by multistep resonant laser-ionization, and time-offlight
mass-spectrometry.
Optical isotope shift and hyperfine structure are determined by scanning
the first, resonant excitation laser frequency. With COMPLISthe
isotope shift and hyperfine structure of the Sn isotopes and spin isomers
from 125-Sn to the doubly magic 132-Sn were investigated spectroscopically
[2]. First results of these measurements will be presented.
[1] J. Sauvage et al., Hyperf. Interact. 129 (2000) 303-317
[2] B. Rouissiere et. al., IPN Orsay Report DR 01 017
HK 10.23 Tue 10:30 Foyer Chemie
A 3 He Magnetometer to Improve the Sensitivity of the Detection
of an Electric Dipole Moment of the Neutron — •S.
Baeßler 1 , W. Heil 1 , Y. Borisov 2 , V. Lobashev 2 , W. Kilian 3 , H.
Rinneberg 3 , P. Seifert 3 ,andY. Sobolev 3 — 1 Institut für Physik,
Mainz, Germany — 2 PNPI Gatchina, Russia — 3 PTB Berlin, Germany
In the near future new powerful sources of ultracold neutrons (UCN)
will be available. They enable us to improve the sensitivity of experiments
searching for a (static) electric dipole moment of the neutron
(EDM) to be about several 10 −28 e·cm. The main sources of systematic
uncertainties are temporal and spatial fluctuations of the magnetic field
which could be correlated with the electrical field and produce an apparent
EDM. A precondition for the above mentioned EDM experiment is
a magnetometer capable of recording and corrrecting for the magnetic
field false effect precisely.
A prototype of a 3 He magnetometer will be decribed. If its output
signal is integrated over periods of about 100 seconds, this is a typical
UCN storage time, the magnetometer is capable of recording magnetic
field fluctuations in the order of several fT in an EDM appartus corresponding
to an uncertainty of the EDM in the above mentioned range.
HK 10.24 Tue 10:30 Foyer Chemie
First measurement of β-decay properties of the proton drip-line
nucleus 60 Ga — •C. Mazzocchi for the GSI-ISOL collaboration —
GSI, Darmstadt, Germany
Nuclei with N�Z between the double shell closures 56 Ni and 100 Snare
of particular interest due to their special nuclear-structure features, including
shape coexistence, the influence of the proton dripline, and the
relevance to the astrophysical rp process. We used the 28 Si( 36 Ar,p3n) reaction
and the ISOL facility of GSI Darmstadt to investigate for the first
time the β decay of 60 Ga [1]. Beta-delayed γ rays were studied by means
of an array of a plastic scintillator and germanium detectors, whereas
charged particles were recorded in silicon-detector telescopes. The halflife
(T1/2) was found to be 70±15 ms. In analogy to the mirror nucleus
60 Cu, spin and parity of 2 + were assigned to the β-decaying 60 Ga state.
Based on the βγγ coincidence data, several 60 Zn levels were identified,
including the isobaric analogue state at 4851.9±0.7 keV and a hitherto
unobserved (2 + 2) state at 2558.7±0.5 keV. The latter lies higher than
in 62−66 Zn, which may reflect the SU(3) structure beyond 56 Ni. By using
Coulomb-displacement energy systematics, a semi-empirical proton
separation energy (Sp) of40±70 keV was derived for 60 Ga. The experimental
results on T1/2, Sp and the structure of 60 Zn levels will be
dicussed in comparison with theoretical predictions, in particular those
obtained from large-scale shell model calculations. Due to the small Sp
value of 60 Ga, only a small fraction of the rp process flow runs through
this nucleus, while its dominant part involves the β decay of 60 Zn.
[1] C. Mazzocchi et al., Eur. Phys. J. A 12, 269 (2001).
HK 10.25 Tue 10:30 Foyer Chemie
Investigation of the 208 Pb(γ,γ ′ ) Reaction Near and Above the
Neutron Emission Threshold* — T. Hartmann, Y. Kalmykov,
P. von Neumann-Cosel, A. Richter, N. Ryezayeva, •A. Shevchenko,
S.Volz, J. Wambach, andA. Zilges — Institut für Kernphysik,
Technische Universität Darmstadt, Germany
A highly-sensitive study of E1, M1 and E2 excitations in 208 Pb at
energies close to the neutron threshold is presented. The resonant photon
scattering experiment with an endpoint energy of 9 MeV has been
performed at the S-DALINAC using two HPGe detectors with 100% efficiency.
The experiment extends previous studies [1] to higher excitation
energies. A detailed picture of the fine structure of the dipole strength
near and above the neutron emission threshold in 208 Pb is obtained. The
deduced E1 strength distribution is compared to microscopic QPM calculations
including the coupling to complex degrees of freedom. The
main low-lying E1 strength is concentrated in two regions near 5.5 and
7.3 MeV. The latter one complies with RRPA predictions for the pygmy
dipole resonance [2].
[1] J. Enders et al., Phys. Lett. B486 (2000) 15.
[2] D. Vretenar et. al., Phys. Rev. C63 (2001) 047301.
* Supported by the DFG under contract FOR 272/2-1.

Nuclear Physics Tuesday
HK 10.26 Tue 10:30 Foyer Chemie
Investigation of Electric Dipole Resonances in N = 82 nuclei ∗ —
•S .Volz, M. Babilon, T. Hartmann, P. Mohr, K. Vogt, andA.
Zilges — Technische Universität Darmstadt, Institut für Kernphysik,
Darmstadt, Germany
Collective electric dipole excitations in atomic nuclei require a breaking
of the proton-neutron symmetry. In nuclei with neutron excess a
so-called Pygmy Dipole Resonance (PDR) has been predicted around 7
MeV which is caused by an oscillation of a neutron crust against a protonneutron
core. Whereas some experimental findings in Ca [1], Sn [2] and
Pb [3] nuclei seem to support such a picture, systematic evidence is still
missing. For the N=82 nuclei 138 Ba, 140 Ce and 144 Sm Nuclear Resonance
Fluorescence (γ,γ ′ ) experiments [4] have been performed in the energy
range between 3 and 10 MeV at the Darmstadt S-DALINAC accelerator.
A resonance-like structure around 7 MeV has been observed in all three
nuclei and will be discussed in the context of various model predictions.
∗ supported by the DFG (contract Zi 510/2-1 and FOR 272/2-1).
[1] T. Hartmann et al., Phys. Rev. Lett. 85, 274 (2000)
[2] K. Govaert et al., Phys.Rev.C57, 2229 (1997)
[3] T. Chapuran et al., Phys.Rev.C22, 1420 (1980)
[4] U. Kneissl et al., Prog. Part. Nucl. Phys. 37, 349 (1996)
HK 10.27 Tue 10:30 Foyer Chemie
Electric dipole strength in medium mass nuclei ∗ — •T. Hartmann
1 , M. Babilon 1 , C. W. Beausang 2 , J. R. Cooper 2 , C. Hutter
1 , R. Krücken 2 , P. Mohr 1 ,andA. Zilges 1 — 1 Institut für Kernphysik,
Schlossgartenstr.9, 64289 Darmstadt — 2 Physics Department -
WNSL, Yale University, New Haven, Connecticut 06520-8124
Recent photon scattering (γ,γ ′ ) studies focused on low lying collective
electric dipole strength in medium mass nuclei [1,2]. Electric dipole
transitions are signs for breaking the p-n-symmetry in a nucleus. Possible
explanations are a coupling of two vibrational phonons or a vibration of a
neutron skin against an inert core. For an understanding of the origin of
the observed E1 strength it is nessessary to gain information about the
detailed γ-decay pattern. We performed a 48 Ca(p,p’γ) 48 Ca test experiment
at the YRAST-Ball at Yale University to find out if an excitation
with hadronic probes allow to detect weak decay branches.
∗ Supported by DFG (Zi510/2-1 and FOR272/2-1) and by the US DOE
(DE-FG02-91ER-40609).
[1] T. Hartmann, J. Enders, P. Mohr, K. Vogt, S. Volz, and A. Zilges,
Phys.Rev.Lett.85, 274 (2000); Erratum Phys. Rev. Lett. 86, 4981
(2001).
[2] T. Hartmann, J. Enders, P. Mohr, K. Vogt, S. Volz, and A. Zilges,
Phys. Rev. C, in press.
HK 10.28 Tue 10:30 Foyer Chemie
Fine Structure of the Isoscalar Giant Quadrupole Resonance
in Closed-Shell Nuclei from High-Resolution Inelastic Proton
Scattering* — J. Carter 1 , R. Fearick 2 , S . Förtsch 3 , Y. Fujita
4 , D. Lacroix 5 , J. Lawrie 3 , Y. Kalmykov 6 , S. Mukherjee
3 , R. Newman 3 , P. von Neumann-Cosel 6 , V. Ponomarev 6 ,
A. Richter 6 , •A. Shevchenko 6 , F. Smit 3 ,andJ. Wambach 6 —
1 Physics Department, University of the Witwatersrand, Johannesburg,
South Africa — 2 Physics Department, University of Cape Town, South
Africa — 3 National Accelerator Centre (NAC), Faure, South Africa —
4 University of Osaka, Japan — 5 LPC Caen — 6 Institut für Kernphysik,
Technische Universität Darmstadt, Germany
The fine structure of giant resonances carries important information on
the coherent motion of nucleons in collective modes of excitations and on
the role of internal and external mixing for the damping.This is reflected
in characteristic energy scales which can be extracted using a wavelet
analysis [1]. After successful application to 208 Pb new experiments at
NAC with high-resolution (35-50 keV) inelastic proton scattering on a
variety of closed-shell nuclei were carried out under kinematical conditions
favoring excitation of the ISGQR. They show that the appearence
of fine structure is a global phenomenon. First results and an interpretation
in comparison to microscopic QPM calculations including coupling
to 2p-2h states are presented.
[1] D. Lacroix et al., Phys. Lett. B479 (2000) 15
*Supported by the DFG under contract FOR 272/2-1 and by the
South-African FRD.
HK 10.29 Tue 10:30 Foyer Chemie
Decay spectroscopy of the N = Z +1 nucleus 79 Y — •J. Döring
for the GSI-ISOL collaboration — GSI, Darmstadt, Germany
In the mass 80 region, the occupation of the intruder d5/2 and high-j
g9/2 orbitals in the proton-rich odd-mass strontium and yttrium nuclei
drives these nuclei to large prolate deformation which is stabilised by the
Z = 38 gap in the single-particle energies. This gives rise to low-lying
collective states which may be populated in β decay. To search for such
states, the β + /EC ground-state decay of the odd-proton N = Z +1nucleus
79 Y has been studied. The 79 Y nuclei were produced by using the
46 Ti( 40 Ca,αp2n) reaction and investigated as mass-separated and chemically
clean beams of 79 Y 19 F + ions by means of the ISOL facility of GSI
Darmstadt. The fluorination method yielded a very efficient suppression
of unwanted reaction products.
Positrons and β-delayed γ rays were measured by using a plasticscintillator
and composite germanium detectors, respectively. The known
79 Y decay scheme [1,2] was extended by about 20 new γ transitions based
on β-γ-γ coincidence relations. Some of the 79 Sr states were identified
to form a rotational-like decay sequence feeding into the 1/2 + [431]
Nilsson bandhead state at 375 keV which is known from an in-beam
study [3]. Quasiparticle-triaxial-rotor calculations indicate that a welldeformed
prolate shape is necessary to reproduce the experimental excitation
energies of this positive-parity sequence.
[1] H. Grawe et al., Z. Phys. A 341, 247 (1992).
[2] J. Mukai et al., Z. Phys. A 342, 393 (1992).
[3] S. Suematsu et al., Kyushu Univ., Tandem Acc. Lab. (1991) p. 72.
HK 10.30 Tue 10:30 Foyer Chemie
Three-Nucleon Forces in Elastic Proton-Deuteron Scattering
— •Karsten Ermisch 1 , A.M. van den Berg 1 , R. Bieber 1 , W.
Glöckle 2 , J. Golak 3 , M. Hagemann 4 , V.M. Hannen 1 , M.N.
Harakeh 1 , M.A. de Huu 1 , N. Kalantar-Nayestanaki 1 , H. Kamada
3 , M. Kiˇs 1 , J. Kuro´s- ˙ Zo̷lnierczuk 3 , M. Mahjour-Shafiei 1 ,
A. Micherdzińska 5 , A. Nogga 2 , R. Skibiński 3 , H. Wita̷la 3 ,and
H.J. Wörtche 1 — 1 Kernfysisch Versneller Instituut, Groningen, The
Netherlands — 2 Institut für Theoretische Physik II, Bochum, Germany
— 3 Institute of Physics, Jagellonian University, Cracow, Poland —
4 Department of Subatomic and Radiation Physics, Gent, Belgium —
5 Institute of Physics, University of Silesia, Katowice, Poland
In the recent years, high-quality nucleon-nucleon potentials have been
developed, which describe the current NN database with a χ 2 ≈ 1. A
question of interest is now, whether these modern nucleon-nucleon potentials
are also adequate to describe three-nucleon systems and to which
extent three-nucleon forces have to be taken into account. Possible observables
which are sensitive to three-nucleon forces are the differential
cross section and the vector analyzing power of elastic proton-deuteron
scattering. To make a systematic investigation of three-nucleon force effects,
both observables have been measured at KVI at several energies
between 100 MeV and 200 MeV for a center-of-mass angular region between
30 ◦ and 170 ◦ . In this contribution, the experimental techniques
used for the measurements along with the preliminary results of the measurements
will be presented.
HK 10.31 Tue 10:30 Foyer Chemie
Spectroscopy of 193 Os, 194 Ir and 196 Pt — •Hans-Friedrich
Wirth 1 , Yvonne Eisermann 1 , Ralf Hertenberger 1 , Gerhard
Graw 1 , Sandra Christen 2 , Oliver Möller 2 , Dimitar Tonev 2 ,
and Jan Jolie 2 — 1 Sektion Physik, LMU München — 2 IKP, Universität
zu Köln
One of the challenges of nuclear spectroscopy is to what an extend the
complex spectra of heavy nuclei result from a restricted number of relevant
degrees of freedom. Especially interesting are nuclei where because
of an assumed specific bosonic and fermionic structure supersymmetry
as a dynamical symmetry may relate the spectra of even-even, even-odd,
odd-even and odd-odd nuclei, as observed for 194 Pt, 195 Au, 195 Pt and
196 Au at low excitation energies, see A. Metz et al., Phys. Rev. Lett. 83,
1542 (1999) and Phys. Rev. C61, 064313 (2000) and J. Groeger et al.,
Phys. Rev. C62, 064304 (2000). To confirm part of the tentative assignments
made for 196 Au and to study nearby nuclei, we measured at the
Munich Q3D spectrograph ( � d,α) to 196 Au and 194 Ir and ( � d,p) to 193 Os.
A new Stern-Gerlach polarised source provided 2 Mikroamp. beam on
target, and with a new detector system we obtain at high countrates
excellent resolution in this very dense spectra and thus unique determination
of excitation energies, spin and parity. Results and experimental
techniques will be discussed.
Work supported in part by the DFG under C4-Gr894/2-3.

Nuclear Physics Tuesday
HK 10.32 Tue 10:30 Foyer Chemie
Light charged particle emission in thermal neutron-induced fission
of 252 Cf ∗ — •S .Oberstedt 1,2 , A. Oberstedt 3 , D. Rochman 1 ,
F. Gönnenwein 4 , I. Tsekhanovitsch 1 , J. Becker 3,5 , J. O. Denschlag
6 , H. Bax 2 , F.-J. Hambsch 2 , and S. Raman 7 — 1 Institut
Laue-Langevin, 6 rue Jules Horowitz, F-38042 Grenoble — 2 EC-JRC
Institute for Reference Materials and Measurements (IRMM), B-2440
Geel — 3 Institutionen för Naturvetenskap, Örebro Universitet, SE-70182
Örebro — 4 Eberhard-Karls Universität Tübingen, D-72076 Tübingen —
5 FB Physik, Bergische Universität GH Wuppertal, D-42097 Wuppertal
— 6 Institut f. Kernchemie, Universität Mainz, D-55099 Mainz — 7 Oak
Ridge National Laboratory, Oak Ridge, Tennessee 37831
High resolution spectral measurements of light charged particles (LCP)
emitted during thermal neutron-induced fission of 252 Cf ∗ (E ∗ =6.2MeV)
have been performed with the recoil mass-separator LOHENGRIN. LCP
emission yields, their mean kinetic energies and widths have been obtained
for nuclear charges Z ≥ 2. For this compound nuclear system
isotopic data for LCPs with Z ≥ 3 are presented for the first time. Emission
of LCPs with masses up to A = 36 has been observed, the heaviest
ternary particle measured so far in low-energy fission.
HK 10.33 Tue 10:30 Foyer Chemie
233 Pa(n,f) cross section for accelerator driven systems —
•Andreas Oberstedt 1 , Birger Fogelberg 2 , Franz-Josef
Hambsch 3 , Stephan Oberstedt 3 , Elisabet Ramström 1,2 ,
and Fredrik Tovesson 1,3 — 1 Dept. of Natural Sciences, Örebro
University, SE-70182 Örebro — 2 Dept. of Radiation Science, Uppsala
University, SE-61182 Nyköping — 3 EU-JRC IRMM, B-2440 Geel
The fission cross section of 233 Pa is of particular interest for reactiv-
ity calculations in accelerator driven systems (ADS) for nuclear power
production involving 232 Th- 233 U fuel cycles, since protactinium plays a
keyrole as an intermediate nucleus in the formation of the fuel 233 U. Neither
previously known experimental values nor the fission cross section
data in evaluated libraries (ENDF, JENDL) above the threshold were
sufficiently accurate to meet the requirements of the IAEA. Despite the
very short half-life of 233 Pa of T1/2=27.0 d and the corresponding high
β-activity, we recently succeeded for the first time to measure directly
the fission cross section for neutron energies between 1.0 and 6.0 MeV
[1].
[1] F. Tovesson, F.-J. Hambsch, A. Oberstedt, B. Fogelberg, E. Ramström,
S. Oberstedt, Phys. Rev. Lett. (in press)
HK 10.34 Tue 10:30 Foyer Chemie
Dilepton detection in the Plastic Ball detector at KVI —
•M. Kiˇs 1 , H. Amir Ahmadi 1 , J.C.S. Bacelar 1 , R. Castelijns 1 ,
R. Čaplar2 , K. Ermisch 1 , I. Gaˇsparić 2 , M.N. Harakeh 1 , N.
Kalantar-Nayestanaki 1 , H. Löhner 1 ,andM. Mahjour-Shafiei 1
— 1 Kernfysisch Versneller Instituut, Groningen, The Netherlands —
2 Institut Rugjer Boˇsković, Zagreb, Croatia
The Plastic Ball detector, a 4π array with approximately 550 plastic
phoswitch scintillators, has been coupled with the SALAD detector at
KVI. It was used for the detection of electron-positron pairs originating
from virtual bremsstrahlung production in a proton-proton scattering at
190 MeV.The Plastic Ball covers about 77% of the 4π solid angle which
together with the good particle identification properties of the phoswich
detector modules leads to much better conditions for the dilepton detection
as compared with previous experiment. The preliminary results of
the ongoing work on the data analysis will be presented.
HK11 Poster Session: Nuclear and Particle Astrophysics
Time: Tuesday 10:30–12:45 Room: Foyer Chemie
HK 11.1 Tue 10:30 Foyer Chemie
Quark matter in heavy-ion collisions and compact stars —
•David Blaschke 1,2 , Gerhard Burau 1 , Christian Gocke 1 ,
Hovik Grigorian 1,3 , Yuri Kalinovsky 1,4 , and Gevorg
Poghosyan 1,3 — 1 Fachbereich Physik, Universitaet Rostock —
2 Bogoliubov Lab. for Theor. Physics, JINR Dubna — 3 Department of
Physics, Yerevan State University — 4 Lab. for Information Technologies,
JINR Dubna
A nonlocal, chiral quark model approach is developed at finite temperature
and density for the description of the chiral symmetry restoration
and deconfinement phase transition as well as for the occurence of a color
superconducting phase with a nonvanishing diquark condensate. The
phase diagram as well as in-medium modification of hadronic properties
are given. Special emphasis is on the description of the Mott effect for
mesons at the deconfinement transition. Signals for this phase transition
in heavy-ion collisions and in compact stars are derived. The anomalous
J/psi suppression effect as observed by the CERN NA50 experiment is
discussed as a Mott effect for D-meson states with consequences for the
kinetics of heavy flavors (charmlike enhancement). A clustering of the
population of compact stars at the critical line dividing hadronic star
from quark core star configurations in the phase diagram (angular velocity
vs. baryon number) of accreting compact stars in low-mass X-ray
binaries is suggested as a signal for deconfinement in their interior. Consequences
of the color superconductivity transition for explosive phenomena
and for the cooling evolution of protoneutron stars are demonstrated.
HK 11.2 Tue 10:30 Foyer Chemie
Hyperon ordering in neutron star matter — •L. Mornas 1 , M.A.
Perez Garcia 1 , J. Diaz Alonso 1,2 , J.P. Suarez Curieses 1 ,and
N. Corte Rodriguez 1 — 1 Departamento de Fisica, Universidad de
Oviedo, E-33007, Oviedo, Asturias, Spain — 2 Observatoire de Paris,
DARC (UMR 8629 CNRS) F-92190 Meudon, France
In a simplified quantum hadrodynamics model where neutrons, protons
and Λ hyperons interact via the exchange of σ and ω mesons, we
compare the energy of the usually assumed uniform phase of neutron
star matter, to a configuration in which di-lambda pairs immersed in an
uniform nucleon fluid are localized on the nodes of a regular lattice. The
confining potential is calculated self consistently under the condition of
β-equilibrium. We were able to obtain stable ordered phases for some
reasonable values of the model parameters. The equation of state can be
considerably softened if such a transition takes place. This could in turn
have important consequences on the structure and cooling of neutron
stars.
[1] M.A. Pérez García, et al.,Nucl. Phys. A in press
HK 11.3 Tue 10:30 Foyer Chemie
The electro-magnetic design of the KATRIN prespectrometer
— •Björn Flatt for the KATRIN collaboration — Johannes Gutenberg
Universität Mainz, 55099 Mainz
The KArlsruhe TRItium Neutrino experiment KATRIN is a planned
next generation tritium beta decay experiment with sub-eV sensitivity
on the electron neutrino mass. In order to determine the neutrino mass
from the beta spectrum its endpoint region has to be analysed with a
high precision. A MAC-E-Filter with 1 eV energy resolution will be used
as main spectrometer. A second MAC-E-Filter will be installed as a prefilter
between β electron source and main spectrometer. The purpose of
this so-called pre-spectrometer is to prevent the main, low energy, part
of the β electrons from proceeding to the main spectrometer, where these
electrons could become a major background source. The new design of
the electrode system and the magnets of the pre-spectrometer follows
the requirement of a low trapping probability for charged particles. This
configuration, which is under construction at the FZ Karlsruhe, is presented.
Sponsored by BMBF under FKZ 05CK1UM1/5
HK 11.4 Tue 10:30 Foyer Chemie
Particle storage in MAC–E–Filters — Beatrix Müller,
•Thomas Thümmler, Jochen Bonn, Beate Bornschein, Lutz
Bornschein, Christian Weinheimer, Jean–Pierre Schall,
Björn Flatt, Fernando Conda, Christine Kraus, andErnst
W. Otten — Institut für Physik, Johannes Gutenberg–Universität
55099 Mainz
Spectrometers of the Magnetic–Adiabatic–Collimator type are used to
examine the endpoint region of the tritium /beta–decay spectrum. Due
to the low count rate of the signal a low background count rate is crucial
for the sensitivity on the neutrino mass especially for the planned
KArlsruhe–TRItium–Neutrino experiment. The magnetic and electric
field configuration of MAC–E–Filter leads to trapping conditions for
charged particles, which are suspected to be the main reason for back-

Nuclear Physics Tuesday
ground events. Our simulations show that trapping conditions can be
destroyed by use of an electric dipole field which is perpendicular to the
magnetic field lines. First experimental studies are under way at the
Mainz neutrino mass experiment.
Work sponsored by BMBF: FKZ06Mz866I/5.
HK 11.5 Tue 10:30 Foyer Chemie
Interferenzeffekt über einen weiten Energiebereich in der
6 Li(d,α) 4 He-Reaktion — •Götz Ruprecht, Daniel Bemmerer,
Konrad Czerski und Peter Heide — Technische Univerität Berlin
Eigene und Meßdaten anderer Gruppen für die Reaktion 6 Li(d,α) 4 He
im astrophysikalisch relevanten Energiebereich wurden mit Berechnungen
verglichen. Es stellte sich heraus, daß eine starke Interferenz zwischen
einer breiten, knapp unterschwelligen 2 + -Resonanz und dem direkten
Reaktionsanteil auftritt. Die Phasen beider Beiträge haben eine
ähnliche Energieabhängigkeit, so daß die Interferenz auch weit außerhalb
des eigentlichen Resonanzgebietes erhalten bleibt. Zur Berechnung
reicht nicht, wie bei schmalen Resonanzen üblich (s. z.B. [1]), das Hinzufügen
eines Interferenzterms, der lediglich die Resonanzphase enthält.
Vielmehr müssen beide Anteile komplett berechnet und kohärent addiert
werden. Dazu wurde der direkte Anteil im Rahmen der DWBA-Theorie
[2] mit Nullreichweitennäherung und der Resonanzterm in der Parametrisierung
von [3] berechnet. Die numerischen Rechnungen basieren auf
dem Quellcode des Programms DWUCK4 von [4]. Als Ergebnis zeigt
sich eine sehr gute Übereinstimung sowohl der S-Faktoren als auch der
Winkelverteilungen über einen weiten Energiebereich.
[1] T. Rauscher und G. Raimann, Phys. Rev. C 53(1996)53
[2]G.R.Satchler,Nucl. Phys. 55(1964)1
[3] A. M. Lane und R. G. Thomas, Rev. Mod. Phys. 30(1958) 257
[4] http://spot.colorado.edu/˜kunz
HK12 Poster Session: Electromagentic and Hadronic Probes
Time: Tuesday 10:30–12:45 Room: Foyer Chemie
HK 12.1 Tue 10:30 Foyer Chemie
Studying Charmed Mesons in Matter — •Olaf N. Hartmann
for the Antiproton Physics Study Group collaboration — Gesellschaft für
Schwerionenforschung, Darmstadt
The proposed antiproton facility at GSI [1] with beam momenta up
to 15 GeV/c will enable investigations of the interaction between particles
containing hidden and open charm with nucleons and nuclei. These
studies will address questions related to the connection of hadron masses
and the spontaneously broken chiral symmetry in QCD. Chiral symmetry
is expected to be partially restored in a hot and/or dense nuclear
environment, leading to observable modifications of hadronic properties
[2,3].
Recent calculations [4] for the D + and D − mesons predict a mass split
of the order of 50 MeV and large enhancements of the near threshold
production cross section. Another example is the possibility to do comprehensive
measurements of the J/ψ-N cross section. Detection of the
weakly decaying charmed hadrons requires that secondary vertices can
be reconstructed with a resolution of about 100 µm. Therefore, a silicon
pixel based microvertex detector is a central component of the detector
concept for the proposed antiproton ring at GSI. The physics potential
and first simulation results on this detector will be presented.
[1] http://www.gsi.de/GSI-Future/cdr/
[2] T. Yamazaki et.al., Phys.Lett.B 418(1998)246
[3] R. Barth et.al., Phys.Rev.Lett 78(1997)4007
[4] A. Hayashigaki, Phys.Lett.B 487(2000)96
HK 12.2 Tue 10:30 Foyer Chemie
Measurement off Virtual Compton scattering off the proton —
•D. Trnka for the TAPS- and A2 collaboration — II. Physikalisches
Institut, Heinrich-Buff-Ring 16, 35392 Giessen
Virtual Compton scattering (VCS), γp→ e + e − p, provides information
on the nucleon electromagnetic form factor and therefore allows to
investigate electromagnetic properties of the proton and its resonances
(e.g.,∆ and D13). Even though a large fraction of the VCScross section
is determined by the Bethle-Heitler (BH) process, there are kinematical
regimes where BH is suppressed so that VCSoff the proton can be studied.
The γp→ e + e − p reaction was investigated at the MAMI tagged
photon beam facility. The lepton pairs were detected with the photon
spectrometer TAPS. Preliminary results will be presented and compared
to theoretical predictions [1].
[1] A. Yu.Korchin and O. Scholten , Phys. Rev. C 62, 015205 (2000)
HK 12.3 Tue 10:30 Foyer Chemie
Research with cooled Antiprotons — •H. Orth 1 , T. Barnes 2 ,
D. Bettoni 3 , R. Calabrese 3 , W. Cassing 4 , M. Düren 4 , S.
Ganzhur 5 , A. Gillitzer 6 , O. Hartmann 1 , V. Hejny 6 , P.
Kienle 7 , H. Koch 5 , W. Kühn 4 , U. Lynen 1 , R. Meier 8 , V.
Metag 4 , P. Moskal 6 , S . Paul 7 , K. Peters 5 , J. Pochodzalla 9 ,
J. Ritman 4 , M. Sapojnikov 10 , L. Schmitt 7 , C. Schwarz 1 , K.
Seth 11 , N. Vlassov 10 , W. Weise 7 , and U. Wiedner 12 — 1 GSI,
Darmstadt — 2 Univ. Tenn., Knoxville — 3 INFN, Ferrara — 4 Univ.
Gießen — 5 Univ. Bochum — 6 FZ Jülich — 7 TU München — 8 Univ.
Tübingen — 9 Univ. Mainz — 10 JINP, Dubna — 11 Northwestern Univ.,
Evanston — 12 ISV, Uppsala
GSI has proposed to build a new international accelerator facility for
beams of ions and antiprotons. One of the main topics will be investigations
into the structure of hadrons and their interaction with the
nuclear medium using cooled antiproton beams of unprecedented quality
and intensity in the momentum range of 1.5 to 15 GeV/c stored in the
High Energy Storage Ring (HESR). The physics program consists of the
following research directions: Charmonium spectroscopy: precision measurements
of mass, width, and decay branches of all charmonium states;
establishment of the existence of QCD-predicted gluonic excitation of
hadrons (i.e. hybrids and glueballs) in the charmonium mass range (3-5
GeV); search for modifications to the properties of charm mesons in the
nuclear environment; study of single and double hypernuclei by precision
γ-ray spectroscopy. Furthermore, many additional interesting physics
topics can be addressed with increasing luminosity of the facility.
HK 12.4 Tue 10:30 Foyer Chemie
Charmonium Spectroscopy with Antiprotons — •J. Ritman for
the Antiproton Physics Study Group collaboration — II. Phys. Inst.,
Gießen
GSI-Darmstadt has recently completed a conceptual design report for
a major new international facility[1]. One of the main components is a
storage ring that allows high luminosity in-ring experiments with cooled
antiprotons between 1.5 and 15 GeV/c. A multi-faceted physics program
into the non-perturbative behavior of Quantum Chromodynamics is envisioned
using ¯p induced reactions. This program includes the attempt
to develop a quantitative understanding of quark confinement, which is a
unique feature of QCD. A promising method to learn more about quark
confinement is to study the excitation spectrum of a bound charm anticharm
quark pair. This system is heavy enough to apply perturbative
methods, and deviations can be attributed to confinement effects. The
physics potential of measuring charmonium states in ¯pp reactions will be
presented together with detailed simulations of the proposed detector’s
performance. Specific emphasis is given to the identification of leptons
(e ± ,µ ± ) with high transverse momentum that are used to identify the
charmonium states.
[1] Conceptual Design Report: http://www.gsi.de/GSI-Future
HK 12.5 Tue 10:30 Foyer Chemie
Optional Extension of the Physics Program with Antiprotons at
GSI — •Sergey Ganzhur for the AntiprotoPhysics Study Group collaboration
— Ruhr UniversitäBochum, Institut für Experimentalphysik I
A major new facility has been proposed at GSI-Darmstadt, which covers
a wide physics program [1]. One of the major components of the
upgrade is a High Energy Storage Ring (HESR) for cooled antiprotons
(1.5–15GeV/c) enabling experiments with a luminosity as high as
about 2 × 10 32 cm −2 s −1 . The first measurements will deal with charmonium
physics, the search for spin-exotic states, medium modification of
hadrons in nuclei, and spectroscopy of double hypernuclei. In this presentation
a possible extension of this program including the measurement of
CP-violation in the charm and hyperon sectors, D-meson spectroscopy
and the study of the dynamics of quarks and gluons in the nucleon and
other hadrons using the inverted Deeply Virtual Compton Scattering
(DVCS) is reported.
This poster will present the physics case and detailed GEANT4 simula-

Nuclear Physics Tuesday
tions of the proposed detector system. Particular emphasis will be placed
on the performance of the central tracking detectors which is a crucial
factor for the feasibility of these extentions to the antiproton physics
program.
[1] Conceptual Design Report: http://www.gsi.de/GSI-Future
HK 12.6 Tue 10:30 Foyer Chemie
The Search for Excited Glue with Antiproton Beams — •C.
Schwarz for the Antiproton Physics Study Group collaboration — GSI,
Darmstadt
One of the main thrusts of the recently proposed High Energy Storage
Ring (HESR) for antiprotons at GSI [1] is the search for gluonic excitations
in the charmonium mass range. Beams of cooled antiprotons with
momenta of 1.5 to 15 GeV/c on an internal target allow the search for
charmed hybrids and glueballs up to a mass of 5.5 GeV/c 2 . Here, all
states are directly populated and allow a measurement with a mass resolution
of δm/m ≈ 10 − 5. In the charmed region the number of resonances
is relatively small and the relative decay widths are narrower than in the
light quark sector. Hence, unambigous identification of the production
and formation experiments is easily performed. The proposed detector
is capable to measure electrons, gammas, and the hadronic final states.
Above points and implicated good particle identification based on imaging
Cherenkov detectors (DIRC,Aerogel Counters) is emphasized in the
present poster This concept of particle identification has been proven to
work by GEANT4 simulations. The measurement of hadronic channels
will allow a selective filtering of final states with gluonic (bosonic) degrees
of freedom.
[1] Conceptual Design Report: http://www.gsi.de/GSI-Future
HK 12.7 Tue 10:30 Foyer Chemie
Hypernuclear Physics with Antiprotons — •J. Pochodzalla for
the Antiproton Physics Study Group collaboration — Inst. f. Kernphysik,
Mainz
One of the main components of the proposed international accelerator
facility at the GSI [1] is a storage ring that allows high luminosity
in-ring experiments with cooled antiprotons between 1.5 and 15 GeV/c.
Due to the large yield of hyperon-antihyperon pairs produced at these
energies a large-scale production of single and double hypernuclei under
unique experimental conditions will be feasible. The precision γ-ray
spectroscopy of these exotic nuclei and the study of their weak decays
provide a large variety of new and exciting perspectives ranging from genuine
hypernuclear states with new symmetries not available in ordinary
nuclei, over non-mesonic weak decays which offer the unique chance to
study the interplay of the quark-exchange and meson-exchange aspects of
the baryon-baryon forces, up to the possibility to study basic properties
of hyperons and strange exotic objects. The physics potential of these
measurements will be presented together with detailed considerations on
the technical realisation of this project.
[1] Conceptual Design Report: http://www.gsi.de/GSI-Future
HK 12.8 Tue 10:30 Foyer Chemie
Calibration of the neutron polarimeter for GE,n — •Frank Klein
— Institut für Kernphysik, J. Gutenberg-Universität Mainz
Previous double polarization measurements of GE,n at the Mainz
microtron MAMI yielded a new parametrization for the electric form
factor of the neutron [1]. This parametrization lies almost a factor of
two above the so far favoured extraction of GE,n from elastic D(e, e ′ )
scattering, where the Paris potential has been used [2]. In order to verify
GE,n in a model-independent way also at higher momentum transfers in
the range of 0.6 − 0.8 (GeV/c) 2 , a neutron polarimeter for a D(�e, e ′ �n)p
experiment was built at the three-spectrometer facility. The results
from the calibration of this polarimeter will be presented.
This work was supported by the DFG (SFB 443).
[1] C. Herberg et al., Eur. Phys. J. A5, 131 (1999)
[2] S. Platchkov et al., Nucl. Phys. A 510, 740 (1990)
HK 12.9 Tue 10:30 Foyer Chemie
Analysis of the pilot experiment (e,e ′ pn) at MAMI — •J. Heim
— Physikalisches Institut, Universität Tübingen, for the Amsterdam,
Glasgow, Mainz (A1) and Tübingen Collaboration
Two-nucleon emission experiments with real and virtual photons represent
an important tool for the study of nuclear many-body systems
beyond the independent particle motion. 3 He and 16 O have been selected
as the benchmark targets for a comprehensive investigations. The
(e,e ′ pp) and the (γ,pN) reactions studied so far have shown indications
of the role of nucleon-nucleon correlations competing with two-body currents
which also result in 2N emission. The (e,e ′ pn) reaction are expected
to give information on tensor correlations, which cannot be seen in pp
knockout. The analysis of the pilot experiment including D, 3 He and 16 O
targets will be presented.
This work is supported by DFG, DAAD, EPSRC, NWO and FOM.
HK 12.10 Tue 10:30 Foyer Chemie
First Analysis of COMPASS Data — •Martin von Hodenberg,
A. Danasino, H. Fischer, J. Franz, A. Grünemeier, S. Hedicke,
F.H. Heinsius, F. Karstens, W. Kastaun, K. Königsmann, J.
Reymann, T. Schmidt, H. Schmitt, andJ. Worch for the COM-
PASS collaboration — Fakultät für Physik, Universität Freiburg
COMPASS is an experiment at the SPS at CERN, which is aiming at a
better understanding of the spin structure of the nucleon, by performing
a measurement of the gluon polarisation ∆G/G. In order to achieve this
goal, polarised muons with an energy of 160 GeV are scattered from a
polarised LiD-target and events are studied where the underlying process
is the fusion of a virtual photon with a gluon of the nucleon. In the year
2001 COMPASS has taken its first data with an almost complete setup
and the analysis is in full activity. The presentation will inform about
the current status of the ongoing analysis.
This project is supported by BMBF.
HK 12.11 Tue 10:30 Foyer Chemie
Der Myontrigger des COMPASS Experiments — •Mario Leberig
für die COMPASS-Kollaboration — Institut für Kernphysik, Universität
Mainz
Eines der Ziele der COMPASS-Kollaboration ist die Messung des
Gluonbeitrags zum Nukleonspin in der polarisierten tiefinelastischen
Myon–Nukleon–Streuung. Dazu steht am SPS (CERN) ein polarisierter
160 GeV Myonstrahl mit einer Intensität von etwa 5 · 10 7 µ/s zur
Verfügung. Die besondere Kinematik des interessanten Prozesses – der
Photon-Gluon-Fusion – und die Eigenarten des Myonstrahles machen
den Aufbau eines vielschichtigen Triggersystems nötig. Der Vortrag beschreibt
das Triggerkonzept und dessen Realisierung für die Datennahmeperiode
im Sommer 2001. Ein besonderer Schwerpunkt wird dabei
auf die Bestimmung der Triggereigenschaften Anhand aktueller Daten
gelegt.
HK 12.12 Tue 10:30 Foyer Chemie
of the
New Results on the Polarized Structure Function gd 1
Deuteron from the HERMES Experiment — •Christoph
Weiskopf for the HERMEScollaboration — University of Erlangen,
Germany
The HERMESexperiment at DESY investigates the spin structure of
the nucleon in deep-inelastic scattering of longitudinally polarized electrons
or positrons on polarized internal gas targets of high purity. The
scattered and produced particles are detected in a forward spectrometer
with high momentum and angular resolution and a reliable particle
identification.
Between 1998 and 2000, data have been taken with a polarized atomic
deuterium target. The double-spin asymmetry Ad 1 in the virtual-photon
nucleon cross section has been measured, which is directly related to the
spin structure function gd 1 .
Compared to previous analyses of HERMESdeuteron data, the kinematic
range has been extended to values of Bjorken-x down to 0.0021 and
photon virtualities Q2 down to 0.1 GeV 2 . The data analysis is outlined
in its most important steps, and the most recent results are presented.
This work is supported by the German Bundesministerium für Bildung
und Forschung.
HK 12.13 Tue 10:30 Foyer Chemie
Azimuthal Single-Spin Asymmetries in Semi-Inklusive Deep-
Inelastic Scattering — •C. Schill for the HERMEScollaboration —
Fakultät für Physik der Universität Freiburg, Hermann-Herder-Str. 3,
D-79104 Freiburg.
In the HERMESexperiment azimuthal single-spin asymmetries have
been observed in semi-inclusive deep-inelastic scattering of 27.5 GeV electrons
off a polarized hydrogen target. Azimuthal target spin asymmetries
provide access to the chiral-odd spin structure function h1(x, Q 2 )
of the nucleon. This structure function is related to the transversity
distribution δq(x) of the quarks in the nucleon. The transversity distri-

Nuclear Physics Tuesday
bution describes the probability to find a transversely polarized quark
in a transversely polarized nucleon. The unpolarized quark density q(x),
the longitudinally polarized quark density ∆q(x) and the transversity
distribution δq(x) together provide a complete description of the quark
and spin density distributions in leading order (twist-2).
For semi-inclusively produced π + and π 0 on a hydrogen target a significant
moment of sin φ is observed in the azimuthal distribution. For π −
the sin φ moment is found to be small. Since 1998 HERMES is taking
data with a polarized deuteron target.
An investigation of the flavour dependence of the transversity distribution
δq(x) will be possible with the measurement of single-spin asymmetries
for different hadrons (π + , π 0 , π − and K + ) and different target
nucleons.
This project is supported by the German BMBF.
HK 12.14 Tue 10:30 Foyer Chemie
Measurement of inclusive K-meson production in B-meson decays
using the BABAR detector — •Stefan Christ for the
BABAR collaboration — AG Elementarteilchenphysik, Universitätsplatz
3, 18051 Rostock
A method to measure the K-meson spectrum from B 0 , ¯ B 0 , B + and
B − decays at the BABAR detector is presented. The BABAR detector is
operated at the PEP-II asymmetric B-meson factory at SLAC. B-mesons
are produced in pairs from Υ(4S) decays with opposite b-quark flavour.
Fully reconstructing one B-meson that decayed into a flavour tagging
channel provides information about the b-quark flavour of this second
B-meson. All particles not used for the reconstruction have to originate
from the second B-meson. By identifying these particles the K-meson
spectrum can be measured for each flavour individually. The analysis
method is presented. The performance of the particle identification is
determined without Monte Carlo simulation.
HK 12.15 Tue 10:30 Foyer Chemie
Measurement of Inclusive η Production in e + e − -Annihilation
Reactions with the BABAR Experiment — •Denis Altenburg
for the BABAR collaboration — TU Dresden, Institut fuer Kern- und
Teilchenphysik, 01062 Dresden
The η momentum spectra and multiplicities in multihadronic events
from e + e − -annihilation reactions are measured using 14.3 fb −1 on the
Υ(4S) resonance ( √ s ≈ 10.58 GeV) and 2.6 fb −1 off resonance data
( √ s ≈ 10.54 GeV) collected with the BABAR detector. The η mesons
are reconstructed using the decay mode η → γγ. The inclusive branching
ratio of B mesons to η mesons B(B →ηX ) has been determined and has
been found to be in reasonable agreement to the corresponding CLEO
result.
HK 12.16 Tue 10:30 Foyer Chemie
Search for the Decay D ∗ s → Dsπ 0 and Measurement of the Partial
Widths Ratio Γ(D ∗ s → Dsπ 0 )/Γ(D ∗ s → Dsγ) with BABAR —
•Martin Dickopp for the BABAR collaboration — Inst. f. Kern- und
Teilchenphysik, TU Dresden, 01062 Dresden
The search for the isospin violating decay D ∗ s → Dsπ 0 in data accumulated
with the BABAR detector located at the asymmetric e + e −
storage facility PEP-II at SLAC is presented. Furthermore, the partial
widths ratio Γ(D ∗ s → Dsπ 0 )/Γ(D ∗ s → Dsγ) has been measured. The
result improves the precision of a measurement by CLEO in 1995.
HK 12.17 Tue 10:30 Foyer Chemie
Search for Eta-nucleus bound state at COSY, Juelich — B. Roy,
H. Machner, •B. Roy, andH. Machner for the GEM collaboration
and the GEM collaboration — Institut für Kernphysik, Forschungszentrum
Jülich, Jülich, Germany
In contrast to the π -nucleon interaction, the η-nucleon interaction
is strong and attractive at low energies ( S-wave ). This provides an
interesting possibility of the existence of the eta-nucleus bound states,
and their production in near threshold η production in proton nucleus
collisions. We plan to produce these η-nuclei in p+ A ZX → 3 He+ A−2
Z−1Yη
or p+ A Z
X → d+A−1
Z Xη reactions by choosing the “magic momentum”of
the proton-beam and the detection angle of 3 He/d such that the η is
produced with very small momentum. In order to detect the η -mesic
nucleus events in the presence of large background, it would be necessary
to demand a triple coincidence of 3 He and the η -mesic nucleus decay
particles, namely, protons and pions. In order to tag the η -mesic nucleus
through its decay products, a large acceptance plastic scintillator
detector “ENSTAR” is being built in Mumbai, India. The detector fab-
rication is at an advanced stage at BARC, Mumbai and will be shipped
to Jülich immediately after the completion of the construction work.
HK 12.18 Tue 10:30 Foyer Chemie
Search for a quasi-bound 3 Heη state at the COSY-TOF spectrometer
— •A. Gillitzer for the COSY-TOF collaboration — IKP,
Forschungszentrum Jülich
The peculiar behavior of the pd → 3 Heη cross section close to threshold
has been interpreted as being the result of a quasi-bound state of the
3 Heη system just below the threshold. We will study this longstanding
question in a formation experiment at the COSY-TOF spectrometer, by
measuring the excitation function of the reaction pd → pppπ − in the
bound region of the 3 Heη system. This is a sensitive observable because
the decay of a quasi-bound 3 Heη state is expected to be dominated by
the ηN → πN channel with two spectator nucleons, a final state having
a characteristic kinematical topology. The COSY-TOF spectrometer including
the forward calorimeter is particularly well-suited for the study
the of the pppπ − final state, i.e. the absorption of the η mesononthe
neutron in 3 He, since the TOF spectrometer has both large acceptance
for the pπ − pair and good particle identification for the pp spectator pair.
The outline of the experiment will be presented, including a discussion
of expected background reactions.
HK 12.19 Tue 10:30 Foyer Chemie
Study of η production on light nuclei — M. Ulicny 1 , H. Machner
2 , •M. Ulicny 1 ,andH. Machner 2 for the GEM collaboration and
the GEM collaboration — 1 University of P. J. ˇ Safárik, Koˇsice, Slovakia
— 2 Institut für Kernphysik, Forschungszentrum Jülich, Jülich, Germany
The production of η-mesons on light nuclei in proton induced reactions
is of interest, because of the high momenta transferred in the reaction,
considerably larger than in pion production. Such high momenta can not
be transferred in a NN-interaction This makes the p + 6 Li → 7 Be + η
reaction especially interesting. We have started to study this reaction
near the kinematical threshold. A proton beam of 1297 MeV/c from the
Cosy accelerator has been used to test the experimental setup. For the
detection of the recoiling nuclei, the magnetic spectrograph BIG KARL
operates as a full solid angle detector. A new introduced detection system
in the focal plane area being completely in vacuum ensures high
kinematical resolution of the heavy recoil. Results of the test run as well
as further detector improvements are discussed.
HK 12.20 Tue 10:30 Foyer Chemie
Deeply bound pionic states in Sn isotopes — •A. Gillitzer 1 , M.
Fujita 2 , H. Geissel 3 , H. Gilg 4 , R.S. Hayano 5 , S. Hirenzaki 2 , K.
Itahashi 6 , M. Iwasaki 6 , P. Kienle 4 , L. Maier 4 , M. Matos 3 , G.
Münzenberg 3 , T. Ohtsubo 7 , M. Sato 6 , M. Shindo 5 , K. Suzuki 5 ,
T. Suzuki 5 , H. Weick 3 , M. Winkler 3 , T. Yamazaki 8 , and T.
Yoneyama 6 — 1 IKP, Forschungszentrum Jülich — 2 Nara Women’s
University — 3 GSI Darmstadt — 4 Technische Universität München —
5 University of Tokyo — 6 Tokyo Institute of Technology — 7 Niigata University
— 8 RI Beam Science Lab., RIKEN
The comparative measurement of binding energy and width of deeply
bound pionic states in nuclei with different N/Z ratio allows to separately
determine the isoscalar and the isovector part of the pion-nucleus potential.
For this purpose the population of deeply bound pionic states in Sn
isotopes was studied in a recent experiment at the GSI Fragmentseparator
(FRS), using the (d, 3 He) reaction from 112,116,120,124 Sn targets. The
incident d beam kinetic energy was chosen to be 500 MeV in order to allow
the formation of substitutional pionic 1s states coupled to 3s1/2 neutron
hole states in recoilfree kinematics. Prominent peaks in the excitation
energy spectrum corresponding to the pionic 1s state were observed in
the irradiation of 116,120,124 Sn. First results of the data analysis will be
presented.
HK 12.21 Tue 10:30 Foyer Chemie
Luminosity determination at COSY-11 using the pd elastic scattering
— •S .Steltenkampfor the COSY-11 collaboration — Institut
für Kernphysik, Universität Münster, Germany
Measurements on the near-threshold η and η ′ meson production in
the reaction channel pd → 3 HeX have been performed at the internal
beam experiment COSY-11 [1,2]. To extract total and differential cross
sections, the proton-deuteron elastic scattering has been measured simultaneously
as reference reaction for normalization purposes. Close to
the η and η ′ meson production thresholds (pthr.,η = 1.570 GeV/c, pthr.,η ′
= 2.434 GeV/c) the COSY-11 facility allows for an identification and

Nuclear Physics Tuesday
momentum reconstruction of elastically scattered protons using a set of
two drift chambers and a scintillation wall. Additionally, a granulated
silicon pad detector enables to detect the corresponding deuterons in
coincidence.
The experimental method will be discussed and recent results will be
presented.
[1] H.-H. Adam, diploma thesis, Universität Münster, Germany (2000).
[2] I. Geck, Staatsexamensarbeit, Universität Münster, Germany (2001).
HK 12.22 Tue 10:30 Foyer Chemie
Luminosity determination in pp experiments at ANKE — •P.
Fedorets 1 , M. Büscher 2 , V. Chernyshov 1 , S.Dymov 3 , V. Komarov
3 , and Yu. Uzikov 3 for the ANKE collaboration — 1 ITEP,
Moscow — 2 Forschungszentrum Jülich — 3 JINR, Dubna
In Jan./Feb. 2001 a first beam time on the a + 0 production in the
reaction pp → da + 0 was performed using the cluster jet target at the
magnetic spectrometer ANKE at COSY Jülich. One way to determine
the average luminosity during this beam time is to use the elastic
proton-proton scattering where the differential cross section is well
known. With ANKE one of the elastically scattered proton is detected
in the forward detection system. The value obtained by this method
yields L =(2.70 ± 0.55) × 10 31 s −1 cm −2 .
HK 12.23 Tue 10:30 Foyer Chemie
Investigation of the reaction pp → nK + Σ + — •Peter Schönmeier
for the COSY-TOF collaboration — Institut für Kern- u. Teilchenphysik,
Technische Universität Dresden *
Reactions of the type pp → NKY are presently studied at COSY in
very detail, in particular the channels Y = (Λ, Σ 0 ). Data on Σ + , Σ − are
not known close to threshold. The COSY-TOF spectrometer complemented
by the neutron detector COSYnus provides access to the nK + Σ +
channel. Its identification is rendered possible by the detection of a neutron,
kaon, and Σ + → nπ + ,pπ 0 decay which results, in general, in an
angle between the tracks of the charged primary and secondary particle.
However, one neutral particle remains undetected. Hence, control of the
large background due to pp → npπ + reactions is of utmost importance
in order to obtain a clear nK + Σ + -signal. We present first results from a
measurement performed at a beam momentum of 2.85 GeV/c.
∗ supported by BMBF and FZJ
HK 12.24 Tue 10:30 Foyer Chemie
Hyperon Production in the channel pp → K + Λp at COSY-TOF ∗
— •W. Schroeder, W. Eyrich, M. Fritsch, F. Stinzing, M.
Wagner,andS.Wirthfor the COSY-TOF collaboration — Physikalisches
Institut, Universität Erlangen-Nürnberg
The exclusive measurement of hyperon production reactions in proton
proton collisions near threshold is one of the main topics at the timeof-flight
spectrometer COSY-TOF. For the hyperon program a complex
start detector system is used in combination with a segmented stop detector.
The setup covers the full phase space and allows the extraction and
reconstruction of the reaction pp → K + Λp almost without background.
The extension of the stop detector by a ring and a barrel-hodoscope to
a 3 m version increases the detector efficiency and improves the angular
and time-of-flight resolution.
Using this upgraded detector version in a measurement in January 2000
Λ-samples with large statistics were recorded at the two beam momenta
of 2.95 and 3.20 GeV/c.
After a short introduction to the analysis methods the preliminary results
of these data will be discussed and compared to Λ-data of previous
measurements at COSY.
∗ supported by BMBF and FZ Jülich
HK 12.25 Tue 10:30 Foyer Chemie
The Reaction pd → 3 Heη at COSY-11 — •H.-H. Adam for the
COSY-11 collaboration — Institut für Kernphysik, Universität Münster,
Germany
The production of mesons in proton-deuteron interactions provides the
possibility to study reaction processes with more than only one involved
target nucleon, i.e. two-step processes [1,2]. Such data might also be of
importance in the context of meson production in heavy ion collisions.
Of considerable interest is the production of η mesons in the
pd → 3 He η reaction channel, which exposes remarkable features [3,4].
The unexpected large threshold amplitude decreases by a factor of three
from threshold up to an excess energy of Q ∼ 7 MeV. This strong
decrease in the near threshold region is commonly attributed to a
strong η 3 He final state interaction and is therefore of special interest
in view of the existence of η-mesic nuclei. Although being topic of
several theoretical investigations, the possibility for the formation of
quasi-bound 3 He − η states is still an open question. Therefore, the
COSY-11 physics program has been extended to near-threshold meson
production experiments in the proton-deuteron interaction. Recent
results on the pd → 3 Heη reaction, studied at excess energies ranging
from Q = 5 MeV to Q = 40 MeV will be presented.
[1] K. Kilian, H. Nann, AIP Conf. Proc. No. 221 (1990) 185.
[2]G.Fäldt and C. Wilkin, Nucl. Phys. A 587 (1995) 769.
[3] J. Berger et al., Phys. Rev. Lett. 61 (1988) 919.
[4] B. Mayer et al., Phys. Rev. C 53 (1996) 2068.
HK 12.26 Tue 10:30 Foyer Chemie
Messung und Analyse der Reaktion γp → K0Σ+ — •Ralf Lawall
für die SAPHIR-Kollaboration — Nussallee 12, 53115 Bonn
Eine neue Messung der Reaktion γp → K0Σ + ist mit dem
SAPHIR-Detektor am Elektronen-Stretcher-Ring ELSA durchgeführt
worden. Die Daten überspannen den Photonenergiebereich von der
Schwelle bis 2.6 GeV und den vollen Produktionswinkelbereich des
2-Teilchenendzustandes. Totale und differentielle Wirkungsquerschnitte
und die Σ + -Polarisation sind bestimmt worden.
HK 12.27 Tue 10:30 Foyer Chemie
Messung der Reaktion γp → K + π + Σ− — •Inez Schulday für die
SAPHIR-Kollaboration — Nussallee 12, 53115 Bonn
Zur Analyse der Reaktion γp → K + π + Σ− sind Daten ausgewertet worden,
die mit dem 4π-SAPHIR-Detektor am Elektronen-Stretcher-Ring
ELSA aufgenommen wurden. Totale und differentielle Wirkungsquerschnitte
sind für den Energiebereich von der Schwelle bis 2.6 GeV bestimmt
worden.
HK 12.28 Tue 10:30 Foyer Chemie
Messung des Differentiellen Wirkungsquerschnitts der Reaktion
γp → pη mit η → 2γ bei Photonenenergien von 0.7 GeV bis
1.3 GeV mit dem CB-ELSA Detektor — •Imrich Fabry für die
CB-ELSA-Kollaboration — ISKP, Universität Bonn
Nach nahezu einem Jahrzehnt erfolgreicher Datennnahme am
CERN wurde der Crystal Barrel Detektor nach Bonn gebracht, wo
am Elektronen-Stretcher-Ring ELSA des Physikalischen Instituts der
Universität Bonn die erste Serie von Experimenten bei ELSA-Energien
bis zu 3.2 GeV durchgeführt worden ist.
Im Schwellenbereich wird die Reaktion dominiert durch die Produktion
der N(1535)S11 Nukleon-Resonanz. Diese Resonanz spielt
eine grosse Rolle in der Baryonenspektroskopie. Dieser Bereich
ist mit übereinstimmenden Ergebnissen durch frühere Experimente
(TAPS,GRAAL,PHOENICS) gut vermessen. Oberhalb von 1 GeV
existieren jedoch nur wenige Datenpunkte. Messungen bis 1.1 GeV
wurden von GRAAL und PHOENICSdurchgeführt, mit sich teilweise
widersprechenden Resultaten. Unsere Daten, die bis 2.8 GeV Photonenenergie
reichen, können zur Klärung der Situation beitragen. Eine
erste Analyse eines Teildatensatz bei einer Photonenenergie von bis
zu 1.4 GeV mit neuen, vorläufigen Ergebnissen zum Differentiellen
Wirkungsquerschnitt werden vorgestellt.
Gefördert durch die DFG.
HK 12.29 Tue 10:30 Foyer Chemie
η photoproduction cross section in η → 2γ and η → 3π 0 decays
with the CB-ELSA experiment at ELSA — •Michael Fuchs for
the CB-ELSA collaboration — ISKP, Universität Bonn
Data on η photoproduction off protons were taken by the CB-ELSA
experiment at the electron stretcher accelerator (ELSA) at Bonn. The
crystal barrel detector is a nearly 4π photon calorimeter and is – in
combination with an inner scintillating fibre trigger detector – an ideal
instrument to investigate multiphoton final states.
A topic of the experiment is the η and η’ photoproduction, especially
the production via baryon resonances. Differential cross sections for η
decaying into 3π 0 and into 2γ will be presented. The photon energy
range up to 2.8 GeV extends the one of previous experiments by a factor
of 2.
Supported by the DFG.

Nuclear Physics Tuesday
HK 12.30 Tue 10:30 Foyer Chemie
Search for Narrow Nucleon Resonances Below Pion Threshold
— •M. Kohl, C. Rangacharyulu, A. Richter, andG. Schrieder
for the A1 collaboration — Institut f. Kernphysik, TU Darmstadt
The question if resonance states exist in the invariant mass region between
the nucleon mass and the pion threshold is of particular importance
for the structure of the nucleon. Since the decay energy of such states is
not large enough to produce a pion, only electromagnetic or weak decay
is possible, leading to extremely narrow decay widths. Recently, some
experimental indications for such resonances have been reported. In pp
scattering, narrow excited states of the nucleon at 1004, 1044, and 1094
MeV/c 2 have been observed [1]. The high-resolution three-spectrometer
facility of the A1 collaboration at the Mainz Microtron MAMI is particularly
suited to verify the existence of such narrow nucleon resonances. A
test experiment in the 1 H(e,e’π + )X reaction provided first indication for
a state at MX = 1007 MeV/c 2 - yet with small significance. The status
of the measurements will be reported.
[1] B. Tatischeff et al., Phys. Rev. Lett. 79 (1997) 601
Supported by DFG under contract RI 242/15-2.
HK 12.31 Tue 10:30 Foyer Chemie
Investigation of the Polarisation Asymmetry in Eta-
Photoproduction on Protons in the GDH-Experiment at ELSA
— •Melitta Godo and Thilo Michel for the GDH-Kollaboration
collaboration — Physikalisches Institut IV, Erwin-Rommel-Str. 1, 91058
Erlangen
An analysis of the data taken by the GDH-Experiment at ELSA in
the energy range between 700 and 1000 MeV has shown the possibility
to extract information about the asymmetry of the eta-photoproduction.
The reaction is identified by a missing-mass-method. With regard to
this method, the acceptance of the GDH-detector for this particular reaction
channel has been simulated. This presentation outlines the acceptance
calculations and first experimental data of an asymmetry in
eta-photoproduction.
HK 12.32 Tue 10:30 Foyer Chemie
Strange decays from excited states of the nucleon — •Ralph
Castelijns, J. Bacelar, and H. Löhner for the Crystal Barrel/TAPScollaboration
— Kernfysisch Versneller Instituut, Groningen,
The Netherlands
The spectrum of excited states of the nucleon can provide essential
information on the quark-gluon structure of hadrons. Complete information
on various decay channels is mandatory, however some channels have
hardly been explored. In particular, decays with many photons in the
final state are difficult to access. We exploit the opportunity of a joint
HK13 Poster Session: Heavy Ions
experiment with the TAPSphoton spectrometer (528 BaF2 crystals) and
the Crystal Barrel detector (1290 CsI detectors) at the tagged photon
beam of ELSA in Bonn to study the barely known decay of excited nucleon
states into a neutral K meson and a Sigma hyperon. This decay
channel may reveal unknown resonances, in particular one expected near
the production threshold. The experiment requires the measurement of
six photons and a proton in the final state. We report on the feasibility
studies and present first results from a commissioning experiment with
photonuclear reactions on the proton.
HK 12.33 Tue 10:30 Foyer Chemie
High-Precision Measurements of Proton-Proton
Bremsstrahlung — •M. Mahjour-Shafiei 1 , H. Amir-Ahmadi 1 ,
J.C.S. Bacelar 1 , R. Castelijns 1 , K. Ermisch 1 , I. Gaˇsparić 2 ,
M.N. Harakeh 1 , N. Kalantar-Nayestanaki 1 , M. Kiˇs 1 , and
H. Löhner 1 — 1 Kernfysisch Versneller Instituut, 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. One
of the simplest reactions to study this force, besides elastic scattering,
is proton-proton Bremsstrahlung. In 1996 a series of experiments were
set up at KVI to study real and virtual proton-proton bremsstrahlung
at 190 MeV in which the kinematics was chosen such that one goes as
far away as possible from the elastic channel, thereby producing higher
energy photons. In continuation of that work and in order to cover a
much larger area of the available phase space, a new set up employing
the SALAD and the Plastic-Ball detectors together was used with which
much smaller photon energies were measured, thus moving toward the
elastic channel. The preliminary results of the first measurements will
be presented.
HK 12.34 Tue 10:30 Foyer Chemie
Investigation of the Polarisation Asymmetry in Eta-Photoproduction
on Protons in the GDH-Experiment at ELSA —
•Melitta Godó and Thilo Michel — Physikalisches Institut IV,
Erwin-Rommel-Str. 1, 91058 Erlangen
An analysis of the data taken by the GDH-Experiment at ELSA in
the energy range between 700 and 1000 MeV has shown the possibility
to extract information about the asymmetry of the eta-photoproduction.
The reaction is identified by a missing-mass-method. With regard to
this method, the acceptance of the GDH-detector for this particular reaction
channel has been simulated. This presentation outlines the acceptance
calculations and first experimental data of an asymmetry in
eta-photoproduction.
Time: Tuesday 10:30–12:45 Room: Foyer Chemie
HK 13.1 Tue 10:30 Foyer Chemie
Close dilepton pair rejection strategies for HADES — •Jaroslav
Bielcik —GSI,Darmstadt
The second-generation dilepton spectrometer HADESat GSI has recently
started to take physics data from heavy-ion induced reactions in
the 1-2 AGeV energy range. The main contribution to the combinatorial
background in the measured e + e− continuum comes from conversion
pairs induced by π0 decay photons.The identification of these pairs and
their removal from the track sample decreases significantly the combinatorial
background to be subtracted from the reconstructed e + e − mass
distribution in order to isolate the vector meson e + e − signal. A full simulation
of the HADESspectrometer response to conversion pairs has been
performed and was used to develop efficient strategies based on a cluster
analysis in MDC and RICH subdetectors to identify such pairs.Our
methods will be presented and results will be discussed.
HK 13.2 Tue 10:30 Foyer Chemie
The HADES second level trigger algorithm: principles and first
results from experiments with 12 C beam — •Alberica Toia,
Wolfgang Kuehn, James Ritman, Joerg Lehnert, Markus
Petri, Michael Traxler, Ingo Froehlich, Daniel Kirschner,
Daniel Schaefer, andAdrian Gabriel for the HADEScollaboration
— II. Physikalisches Institut, Giessen
The dilepton spectrometer HADESat GSI Darmstadt investigates lepton
decays of vector mesons in elementary and heavy ion reactions. Since
the branching ratio of these decays is in the order of 10 −5 , a highly selective
real time trigger is needed in order to improve the quality of data and
the statistics. This trigger consists of 3 Image Processing Units which
perform pattern recognition to detect lepton signatures in different subdetectors
and a Matching Unit which combines the position information
into tracks to make the final decision. To investigate and characterize
the functionality of this trigger, all hardware components have been emulated
with software. After testing the emulation with simulated and
real data, the performance of the hardware trigger has been investigated
with data from recent beamtimes. The goals, methods and results of this
analysis will be presented.
HK 13.3 Tue 10:30 Foyer Chemie
Correlation studies with INDRA@GSI — •C. Schwarz for the
ALADIN-INDRA collaboration —
GSI, Darmstadt
Correlation funcions, constructed from light-particle coincidences, give
access to the spatial extension of the emitting source. This is due to the
final-state interaction of the emitted particle pairs which depend on their
spatial proximity. Using this technique, the interaction zone as well as
the quasi-projectile and quasi-target sources of light particles were inves-

Nuclear Physics Tuesday
tigated for several reaction systems studied at beam energies between 40
and 150 AMeV during the INDRA@GSI campaign. The observed dependence
of the source size on the impact parameter and on the collision
partners agree well with the expectations for the reaction geometry.
HK 13.4 Tue 10:30 Foyer Chemie
Pions in Spectator Fragmentation Induced by Relativistic 12 C
Projectiles — •Ketel Turzó for the ALADIN-INDRA collaboration
— GSI Darmstadt, Planckstr. 1, D-64291 Darmstadt
As part of the INDRA@GSI campaign in 1998/1999, fragmentation
in asymmetric systems like 12 C+ 197 Au and 12 C+ 112,124 Sn was studied
at bombarding energies ranging from 95 to 1800 AMeV. At angles
θlab ≥ 45 ◦ , particle detection and identification with high resolution was
achieved with the Si-Si-CsI(Tl) calibration telescopes of the INDRA multidetector
system, including the identification of charged pions.
Delta and pion production and absorption represent an efficient heating
mechanism in collisions at relativistic energies. The present data permit
the study of correlations between pion and fragment emissions, i.e. between
emissions reflecting properties of the primary heating phase of the
collision and of the subsequent decay of a highly equilibrated spectator
system. First results, indicating an anticorrelation between the multiplicities
of pions and intermediate-mass fragments for lower spectator
excitations, will be presented.
HK 13.5 Tue 10:30 Foyer Chemie
Particle Intensities at the GSI Secondary Beam Facility —
•M. Ardid 1 , J. Diaz 1 , A. Andronic 2 , A. Banu 2 , O. Busch 2 , M.
Gersabeck 2 ,andR.S. Simon 2 — 1 Institut de Física Corpuscular, Universitat
de València and Centro Superior de Investigaciones Científicas,
E-46071 València, Spain — 2 Gesellschaft für Schwerionenforschung, D-
64291 Darmstadt, Germany
Using protons and 12 Cand 14 N ions from the 18 Tm heavy–ion synchrotron
SIS, secondary beams of electrons and pions are produced and
delivered to the experimental areas in the SIS target hall. We discuss
the production mechanism in the pencil–like thick target rods and address
the transport performance of the beam lines as well as the impact
of diagnostic detectors for monitoring and precise momentum definition.
Mixed π − /e − beams with momenta between 0.5 and 2.0 GeV/c have been
extensively used for prototype tests of the ALICE Transition Radiation
Detector, while π + beams around 1 GeV/c with maximum intensity and
optimal π + /p ratio are required for physics runs at the HADESand Kaon
Spectrometer.
HK 13.6 Tue 10:30 Foyer Chemie
Λ - Production in C+C Reactions at 158 AGeV* — •I. Kraus 1 ,
L. Betev 2 , A. Billmeier 1 , C. Blume 1 , R. Bramm 2 , P. Buncic 2 , P.
Dinkelaker 2 , M. Ga´zdzicki 2 , T. Kollegger 2 , C. Markert 3 , R.
Renfordt 2 , A. Sandoval 1 , R. Stock 2 , H. Ströbele 2 , D. Vranić 1 ,
A. Wetzler 2 ,andJ. Zaranek 2 for the NA49 collaboration — 1 GSI,
Darmstadt — 2 Institut für Kernphysik, Frankfurt — 3 Yale, New Haven,
USA
The number of hyperons (Λ) per participating nucleon is higher in
A+A than in p+p collisions [1]. It is interesting to measure the detailed
behavior of hyperon production as a function of the system size in order
to determine the onset of this type of strangeness enhancement.
NA49 has taken data not only on Pb+Pb but also C+C collisions.
The results from the light C+C system are compared to earlier measurements
of Λ hyperons in central S+S (NA35), central Pb+Pb and p+p
interactions.
[1] A.Mischke et al. (NA49 Collab.), Proceedings of the 6th International
Conference on Strangeness in Quark Matter 2001
* Supported by GSI and BMBF
HK 13.7 Tue 10:30 Foyer Chemie
Production of φ → e + e − in central Pb+Pb collisions at
158AGeV ∗ — •Peter Dinkelaker 1 , L. Betev 1 , C. Blume 2 , R.
Bramm 1 , P. Buncic 1 , M. Ga´zdzicki 1 , T. Kollegger 1 , I. Kraus 2 ,
A. Mischke 2 , R. Renfordt 1 , A. Sandoval 2 , R. Stock 1 , H.
Ströebele 1 , D. Vranic 1 , A. Wetzler 1 ,andJ. Zaranek 1 for the
NA49 collaboration — 1 Institut für Kernphysik, Universität Frankfurt
— 2 Gesellschaft für Schwerionenforschung, Darmstadt
The first results on φ → e + e − production in central Pb+Pb collisions
at 158 AGeV are presented. They are based on the NA49 data (3 million
events) taken in the dedicated run in 2000. The obtained upper limit
estimate for the φ yield is compared with the results for the hadronic decay
channel φ → K + K − measured in NA49 and for the leptonic decay
channel φ → µ + µ − measured in NA50. A review of models concerning
φ production and possible differences between results obtained from
leptonic and hadronic decay channels is given.
∗ supported by BMBF and GSI
HK 13.8 Tue 10:30 Foyer Chemie
Calibration and charged particle distributions of the Forward-
TPCs in the STAR Experiment — •Jörn Putschke, Volker
Eckardt, Andreas Gärtner, Gaspare Lo Curto, Markus
Oldenburg, Patrizia Krok, Maria Mora, Andreas Schüttauf,
Norbert Schmitz, Janet Seyboth, Peter Seyboth, Frank
Simon, and Michael Vidal — Max-Planck-Institut für Physik,
Föhringer Ring 6, 80805 München
The two Forward-TPCs, designed and constructed at the Max-Planck-
Institut für Physik in Munich, expand the overall acceptance of the STAR
detector at the Relativistic Heavy Ion Collider (RHIC) to the pseudorapidity
region 2.5 < |η| < 4. Due to the high multiplicity of approximatly
500 charged particle in each Forward-TPC in a central Au+Au collisions
at √ sNN = 200 GeV, a radial drift configuration perpendicular to the
magnetic field was choosen to improve the two-track separation.
To calibrate the drift velocity and the � E × � B corrections in the nonuniform
radial drift field a laser calibration system was used. In contrast
to a standard configuration TPC a good measurement of the drift velocity
is essential to accurately determine the spatial positions of the hit
clusters and to precisely determine the momenta of the charged particles.
Preliminary results will be discussed on the charged particle distributions
and the baryon number flow as difference in the distributions of
positively and negatively charged particle as a function of η.
HK 13.9 Tue 10:30 Foyer Chemie
The role of three-body collisions in φ mesonproduction processes
near threshold in heavy-ion reactions — •H.W. Barz 1 ,
B. Kämpfer 1 , M. Zetenyi 2 ,andGy. Wolf 2 — 1 FZ Rossendorf,
D-01314 Dresden — 2 KFKI Budapest, H-1525 Budapest
The amplitude of subthreshold φ meson production is calculated using
dominant tree-level diagrams for three-body collision. It is shown that
the production can overwhelmingly be described by two consecutive twostep
processes, i.e. the cross section factorises in two sub-cross-sections
with an intermediate on-shell particle. As a consequence to desribe the
production of heavy mesons within transport models all intermediate
particles have to be included in the calculations. The effect is demonstrated
in calculating φ production in heavy-ion collisions at bombarding
energies around 2 GeV per nucleon as recently measured by the FOPI
collaboration. Including elementary ρ − N, ρ − ∆andπ − ρ collisions the
calculated production rates increase by about a factor of three compared
to earlier calculations which do not include these channels. Momentum
spectra of φ mesons and dilepton spectra which are accessible in future
HADESand FOPI experiments are given.
HK14 Poster Session: Instrumentation and Applications
Time: Tuesday 10:30–12:45 Room: Foyer Chemie
HK 14.1 Tue 10:30 Foyer Chemie
Quantitative analysis of lepton induced Cherenkov rings in
a CsI based RICH — •L. Fabbietti, T. Eberl, J. Friese, R.
Gernhäuser, J. Homolka, H.-J. Körner, M. Münch, B. Sailer,
and S. Winkler for the HADEScollaboration — Technische Universität
München, James-Franck-Strasse 1,D-85748 Garching
A Monte-Carlo based understanding of the lepton induced Cherenkov
ring recognition in the RICH detector is crucial for the whole lepton
identification in the HADESspectrometer.
A dedicated measurement was performed which allows to study the
response of the RICH detector to the photon signal. The results of these
studies were used to optimize the digitasation procedure for the RICH detector,
in order to achieve a good agreement between real and simulated
data for the heavy ion reaction environment.

Nuclear Physics Tuesday
A set of full GEANT simulations of the HADESspectrometer, using
UrQMD and thermal sources as input, was analysed and compared
to the experimental data for the reaction C+C@1.5AGeV and
Cr+Al@1.5AGeV. The quantitative evaluation of these comparisons will
be presented.
∗ supported by BMBF (6TM970I) and GSI (TM-FR1).
HK 14.2 Tue 10:30 Foyer Chemie
Impact of the calibration of the HADES drift chambers on the
quality of the tracking — •Peter Zumbruch for the HADEScollaboration
— GSI, Gesellschaft für Schwerionenforschung, Darmstadt,
Germany
HADES, a High Acceptance DiElectron Spectrometer, is a second generation
experiment at the GSI SIS facility in Darmstadt. Its scientific
program includes studies of in-medium properties of hadrons in hadronic
matter and the electromagnetic structure of hadrons.
High quality tracking is needed to provide a high invariant mass resolution
(1 background.
In the HADESsetup a high precision tracking is performed by two
pairs of two multiwire drift chamber (MDC) modules in front and behind
of the toroidial magnet field.
The quality of the tracking is mainly affected by the performance and
the alignment of the individual chambers as well as the accuracy of the
drift time measurements. Hence, precise time calibration strategies - developed
with data and simulation - are essential to meet the ambitious
design goals of HADES.
supported by
GSI, BMBF, DFG, INTAS, EC
HK 14.3 Tue 10:30 Foyer Chemie
The HADES Run Control ∗ — •B. Sailer, T. Eberl, L. Fabbietti,
J. Friese, R. Gernhäuser, J. Homolka, H.-J. Körner, M.
Münch, andS. Winkler — Technische Universität München, James-
Franck-Strasse 1, D-85748 Garching
The new High Acceptance DiElectron Spectrometer HADES has been
setup at GSI Darmstadt and is now ready to take data. The ATM-based
data aquisition together with a multilevel trigger system will be able to
read out 70 000 channels with a first level trigger rate of 10 5 Hz with zero
supression and transport 1−2×10 3 events to mass storage every second.
To operate this complex system consists of more than 1 000 frontend and
over 100 VME boards with a large number of different tasks and layouts,
a run control system based on the EPICSpackage has been developed
making use of its network communication layer, monitoring capabilities
and sequencing. In particular an interface has been developed that allows
to bring several thousand parameters from different sources to the run
control system and to write back status information to a database. The
layout of the system will be presented.
∗ supported by BMBF (6TM970I) and GSI (TM-FR1).
HK 14.4 Tue 10:30 Foyer Chemie
Programmable Downscalers and Dead-Time Measurement for
HADES — •D. Schäfer, I. Fröhlich, A. Gabriel, D. Kirschner,
W. Kühn, J. Lehnert, M. Petri, J. Ritman, A. Toia, andM.
Traxler for the HADEScollaboration — II. Physikalisches Institut
Universität Giessen, Heinrich-Buff-Ring 14, 35392 Giessen
The HADES-Spectrometer at GSI Darmstadt allows the production of
dilepton pairs in hadron and heavy ion induced reactions up to 2 AGeV to
be investigated. The trigger system (raw event rate 100 kHz) is designed
to reduce the event rate by a factor of 100.
The HADESTrigger system is a distributed modular system. It includes
dedicated Detector Trigger Units for each detector subsystem
which all communicate with the Central Trigger Unit (CTU) via the
first and second level trigger bus.
In order to accomodate a large variety of experiments the functionality
of the CTU will be extended by an additional module. This module
provides programmable downscaling and dead time measurement for
each of the individual inputs. Dead-time measurements will be made by
determining the rates before and after the downscaling for each input.
The add-on will be implemented into a Field Programmable Gate Array
(FPGA) to allow flexible configuration.
HK 14.5 Tue 10:30 Foyer Chemie
Concept for a Dedicated Multi-Node Data Processing System
for Realtime Trigger and Analysis Applications — •D.
Kirschner, I. Fröhlich, A. Gabriel, W. Kühn, J. Lehnert, M.
Petri, J. Ritman, D. Schäfer, A. Toia, andM. Traxler —II.
Phys. Inst. Giessen,, Heinrich-Buff-Ring 14, 35392 Giessen
Modern Experiments in hadron physics like the HADESdetector 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 (posibility
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 concept of a prototype VME-Bus card for data distribution and
analysis in a multi-node environment will be presented. The card will
be divided into two major units: a network unit featuring two Gigabit
Ethernet connections and a computational part featuring several Digital
Signal Processors.
HK 14.6 Tue 10:30 Foyer Chemie
Status of the HADES detector alignment — •Alexandre
Sadovski 1 , H. Agakichiev 2 , H. Alvarez-Pol 3 , I. Duran 3 , B.
Fuentes 3 , J. A. Garzon 3 , W. König 2 , R. Kotte 1 , V. Pechenov 4 ,
M. Sanchez 3 ,andP. Zumbruch 2 for the HADEScollaboration —
1 Forschungszentrum Rossendorf, Institut für Kern- und Hadronenphysik,
Dresden, Germany — 2 GSI Darmstadt, Germany — 3 Universidade de
Santiago de Compostela, Spain — 4 Joint Institute of Nuclear Research,
Dubna, Russia
The accurate determination of the masses of various vector mesons decaying
into e + e − pairs is among the physics goals of the starting HADES
experiments at SIS/GSI Darmstadt. This requires an overall invariant
mass resolution of about 1 %. To achieve the corresponding momentum
resolution a precise knowledge of the detector position is needed. A common
way to do this is to correct (align) for possible deviations from the
nominal positions using calibration data and the knowledge of the detector’s
geometry. Several alignment procedures have been developed and
tested using tracks from data on heavy-ion collisions aquired during several
data taking periods. Alignment corrections for the multiwire drift
chamber (MDC) positions have been found. Checks for MDC alignments
have been developed and successfully applied. The methods and results
used will be presented and surveyed.
HK 14.7 Tue 10:30 Foyer Chemie
A client - server based online monitoring system based on
ROOT,QT and OpenGL for the use in the HADES experiment.
— •Jörn Wüstenfeld for the HADEScollaboration — Johann
- Wolfgang Goethe Universität Frankfurt, Institut für Kernphysik
August-Euler-Stra¨se 6 D-60486 Frankfurt / M
Even though the prices for CPU’s and memory are low, no experiment
has ever enought computing power available. Therefore new techniques
for the online/offline analysis have to be developed. One possible way
is to use a client - server model, where the computing intensive part is
done on one central machine with fast CPU’s and big memory, while
the displaying task is hosted by decentral machines with less computing
power.
Following this concept, a monitoring system has been implemented in
the HADESanalysis framework. Besides basic functionalities it provides
global detector performace monitoring and a 3D eventdisplay of HADES.
The talk will present the conceptual design of the monitoring system and
a demonstration of the achieved monitor capabilities.
This work was supported by GSI, BMBF, DFG, INTAS, EC.
HK 14.8 Tue 10:30 Foyer Chemie
Datenaufbereitung und -analyse für das A4-Experiment an
MAMI — •Sebastian Baunack für die A4-Kollaboration — Institut
für Kernphysik, Johannes-Gutenberg-Universität Mainz, 55099 Mainz
Das totalabsorbierenden Bleifluorid-Kalorimeter des A4-Experimentes
an MAMI zur Messung der Paritätsverletzung in der elastischen Streu-

Nuclear Physics Tuesday
ung polarisierter Elektronen an unpolarisiertem Wasserstoff ist seit Inbetriebnahme
im Sommer 2000 erfolgreich im Einsatz. Seither wurden
viele Hundert Stunden Daten am Strahl genommen.
Um im Meßbetrieb eine schnelle Qualitätsprüfung vornehmen zu
können, wurde ein Online-Datenanalysesystem entwickelt, das die
Energiespektren des Kalorimeters auswertet und graphisch darstellt.
Die Zusammenführung mit weiteren Daten (Strahlmonitorierung etc.)
bildet die Basis für die spätere Offline-Analyse.
Datenaufbereitung und -analyse für einen ersten Datenpunkt werden
vorgestellt.
HK 14.9 Tue 10:30 Foyer Chemie
Monitorierung strahlbedingter Asymmetrien für das A4-
Experiment an MAMI — •Thorsten Hammel für die
A4-Kollaboration — Institut für Kernphysik, Johannes-Gutenberg-
Universität Mainz, 55099 Mainz
Die Kollaboration A4 an MAMI strebt die Vermessung eines möglichen
Beitrags der Strangeness zu den Pauli-Formfaktoren des Nukleons
an. Die experimentelle Methode besteht in der Bestimmung der paritätsverletzenden
Asymmetrie in der Zählrate der elastischen Streuung
von rechts- und linkshändig polarisierten Elektronen an einem unpolarisiertem
Flüssig-Wasserstoff-Target.
Während des Experiments ist eine Messung von allen Größen, die im
Falle einer Korrelation mit der Polarisationsumschaltung eine systematische
Veränderung der gemessenen Asymmetrie bewirken können, erforderlich.
Hierzu werden Strahlparameter, wie Strom, Intensität, Energie,
Strahllage, Strahlwinkel, sowie die Targetdichte während der gesamten
Messzeit gleichzeitig zum laufenden Experiment überwacht. Das hierzu
entwickelte Detektorsystem ist seit 1999 aufgebaut und erfolgreich im
Einsatz.
Es werden das Detektorsystem sowie Messungen mit dem vollständigen
Aufbau und Ergebnisse vorgestellt und diskutiert.
HK 14.10 Tue 10:30 Foyer Chemie
Aufbau der Ausleseelektronik für das A4-Experiment an MAMI
— •Rainer Kothe für die A4-Kollaboration — Institut für Kernphysik,
Johannes-Gutenberg-Universität Mainz, 55099 Mainz
Die Kollaboration A4 an MAMI strebt die Vermessung des Beitrags
der Strangeness zu den Pauli-Formfaktoren des Nukleons an. Die experimentelle
Methode besteht in der Bestimmung der paritätsverletzenden
Asymmetrie in der Zählrate der elastischen Streuung rechts- und
linkshändig polarisierter Elektronen an einem unpolarisiertem Flüssig-
Wasserstoff-Target.
Die gestreuten Elektronen werden mit 1022 Bleifluoridkristallen nachgewiesen.
Die Energie der Einzelereignisse wird mittels der nachgeschalteten
Ausleseelektronik bestimmt und kanalweise histogrammiert.
Vorgestellt wird diese Ausleseelektronik, im Hinblick auf deren Aufbau,Test
und Weiterentwicklung, sowie Ergebnisse bisheriger Messungen.
HK 14.11 Tue 10:30 Foyer Chemie
Investigation of Parametric X–Radiation under small Bragg angles
at MAMI — •G. Kube, C. Ay, H. Backe, N. Clawiter, M.
El Ghazaly, F. Hagenbuck, K.-H. Kaiser, W. Lauth, H. Mannweiler,
H. Rochholz, andT. Weber — Institut für Kernphysik,
Universität Mainz, J.-J. Becher Weg 45, 55099 Mainz
When a charged ultrarelativistic particle passes through a perfect crystal
the particle field can be diffracted in the vicinity of the Bragg angle.
The emitted radiation is called quasi– Čerenkov radiation or parametric
X–radiation. The energy ¯hω of the X–ray photons which are
most efficiently radiated is predicted for silicon with plasma frequency
ωp =31eV/¯hand a Lorentz factor γ = 1672, as for the Mainz Microtron
MAMI, to be ¯hω = γ ¯hωp = 51.8 keV [1]. Angular distributions of (111),
(333) and (444) reflections for silicon single crystals of various thicknesses
between 100 and 500 µm have been investigated at MAMI for Bragg angles
θB ≤ 5◦ . The measured intensity distributions will be compared with
theoretical calculations.
[1] A. Caticha, Phys.Rev. B45 (1992) 9541
Work supported by the DFG under contract BA 1336/1-3
HK 14.12 Tue 10:30 Foyer Chemie
Stabilization system for the A4-Compton-Polarimeter —
•Jürgen Diefenbach for the A4 collaboration — Institut für
Kernphysik, Universität Mainz
The A4-Collaboration at the University of Mainz measures parity violation
in electron proton scattering. The longitudinal polarization of
the electron beam is to be measured with a compton backscattering polarimeter.
The intracavity design requires long laser resonator arms. It is
therefore important to properly stabilize the optics. First an overview of
the stabilization requirements is given, then implementation methods using
analog and digital filters are presented. The effects on the measuring
accuracy are discussed.
HK 14.13 Tue 10:30 Foyer Chemie
Elemental Analysis of Soil Samples from Toshki in Upper Egypt
by using Instrumental Neutron Activation Analysis Techniques
— •Atef Eltaher 1,2 , K. L. Kratz 1 , A. Nosser 2 ,andA. Azzam 3 —
1 Institut für Kernchemie, J. Gutenberg-Universität, D-55128 Mainz, Germany
— 2 Physics Department, Faculty of science, Al-Azher University,
Assiut Egypt — 3 Nuclear Physics Deparment, Atomic Energy Authority,
Cairo Egypt
Instrumental neutron activation analysis techniques (INAA) were applied
for elemental analysis of soil samples collected from Toshki area 280
km from Aswan city in Upper Egypt. The samples were irradiated with
thermal neutrons at the TRIGA Mainz research reactor. Gamma-ray
spectra were recorded using a HPGe detector to determine the contents
of major, minor and trace elements in these samples. As a result of the
analysis, altogether 32 elements were identified qualitatively and quantitatively.
These elements are: Na, Mg, Al, Cl, K, Sc, Ca, Cr, Ti, V, Mn,
Fe,Co,Zn,Rb,Zr,As,Nb,Sn,Ba,Cs,La,Ce,Nd,Eu,Sm,Yb,Lu,Hf,
Ta, Th and U. In several cases, X-ray fluorescence analysis (XRF) was
used for comparison. Furthermore delayed neutron activation analysis
(DNAA) was used to determine the uranium content from these samples.
The results from different analysis techniques will be compared and
discussed.
HK 14.14 Tue 10:30 Foyer Chemie
Implementation of a RISC CPU in FPGA
— •A. Danasino, H. Fischer, J. Franz, A. Grünemaier, S.
Hedicke, F.H. Heinsius, M. von Hodenberg, F. Karstens, W.
Kastaun, K. Königsmann, J. Reymann, T. Schmidt, H. Schmitt,
and J. Worch for the COMPASS collaboration — Fakultät für Physik,
Universität Freiburg
The CATCH modules are the central building blocks of the readout
system of the COMPASS experiment. The CATCH acts as a local event
builder, adding information useful for the localization of the signals sent
from the detectors. The CATCH is designed with several programmable
logic devices (FPGA and CPLD). For monitoring and control of the data
flow a complete system-on-a-chip design is implemented in one FPGA.
It includes a 16 bit RISC processor which is clocked with 10 MHz. The
microprocessor core is derived from the XSOC project developed by Jan
Gray of Gray Research LLC. Very flexible programming can be done
in integer C which is translated to the MIPSbased instruction set of
the microprocessor. It can communicate to all other FPGAs on the
CATCH, reset and monitor mezzanine cards and send serial initialization
data to the front end boards. It can drive a four character display
on the front panel of the CATCH module. For further information:
http://hpfr02.physik.uni-freiburg.de/projects/compass/electronics
This project is supported by the BMBF.
HK 14.15 Tue 10:30 Foyer Chemie
X-ray diagnostics and calibration of the COMPASS straw detectors
— •Klaus Platzer 1 , Wolfgang Duennweber 1 ,andHermann
Wellenstein 2 — 1 Sektion Physik der LMU, Am Coulombwall 1,
85748 Garching — 2 Physics Department, Brandeis University, Waltham
MA 02454
A scanning device consisting of a continuous beam, 50kV X-ray tube
and a 20mm x 30mm CCD has been installed for the inspection of the
straw tracking system of the COMPASS experiment at CERN. One double
layer of about 800 straws, covering an area of 3.2m x 2.7m, is scanned
in about 30 hours. The result is a grid of 5000 wire positions. The control
of wire and wall spacing is possible with a local resolution better than
5 µm. The absolute wire positions are determined with an accuracy of
about 50 µm, wich is sufficient as compared with the particle tracking
resolution of about 200 µm of a single straw.

Nuclear Physics Tuesday
HK 14.16 Tue 10:30 Foyer Chemie
Tracking Capabilities of COMPASS GEM Detectors † — •Frank
Simon 1 , Jan Friedrich 2 , Boris Grube 2 , Bernhard Ketzer 3 ,
Igor Konorov 2 , Stephan Paul 2 ,andFabio Sauli 3 for the COM-
PASS collaboration — 1 Max–Plank–Institut für Physik, München, Germany
— 2 Physik–Department E18 TU München, Garching, Germany —
3 CERN, Geneva, Switzerland
For the small angle tracking of the COMPASS Experiment at CERN’s
SPS accelerator, a total of 20 triple–GEM detectors, each with an active
area of 31×31 cm 2 , are used. Prior to their successful operation in
the COMPASS physics run in 2001, the detectors were tested in various
particle beams to determine their tracking capabilities. The spatial
resolution was shown to be better than 50 µm and an efficiency of 99%
was reached for minimum–ionizing particles. The GEM detectors are
equipped with an orthogonal two–dimensional projective readout that
leads to a correlation between the charge collected on both readout coordinates.
The charge ratio has a mean value close to unity and a width
σ

Nuclear Physics Tuesday
In this talk we discuss the possible application of new reconstruction
techniques in nuclear physics experiments. Furthermore the problem of
generalisation and implementation in other fields such as medical imaging
will be discussed. As an application we present the status of ongoing
work with planar low energy x-ray images obtained at small stereo angles.
HK 14.24 Tue 10:30 Foyer Chemie
Performance of the CERES TPC — •H. Appelshaeuser 1 and A.
Marin 2 for the CEREScollaboration — 1 Physikalisches Institut der
Universität Heidelberg — 2 Gesellschaft für Schwerionenforschung mbH
In 1998 the CERESspectrometer was upgraded by the addition of
a large cylindrical Time Projection Chamber (TPC) operated inside
the field of a new magnet system to provide momentum measurement.
Key issue is the improvement in mass resolution in the ρ/ω/φ region to
∆m/m < 2%. The TPC adds also to the electron identification capability
via dE/dx. Furthermore, the TPC opens the possibility of reconstructing
the φ meson through its K + K − decay channel.
The operation of a radial drift TPC inside an inhomogeneous magnetic
field requires a very detailed understanding of the underlying electric and
magnetic field configurations, drift properties for the Ne:CO2 (80:20) gas
mixture, and detector geometry. We present the status of the TPC calibration
and discuss the present performance.
HK 14.25 Tue 10:30 Foyer Chemie
Laboratory High Speed DAQ — •F. Karstens, A. Danasino, H.
Fischer, J. Franz, A. Günemeier, S. Hedicke, F.H. Heinsius,
M. v. Hodenberg, W. Kastaun, K. Königsmann, J. Reymann,
T. Schmidt, H. Schmitt, andJ. Worch —Fakultät für Physik der
Universität Freiburg, Hermann-Herder-Str. 3, D-79104 Freiburg.
Hitherto data acquisition systems in laboratories were characterized by
flexible setups, but slow data rates. High data rates are mainly realized
in fixed setups at large accelerator experiments. This poster presents a
solution, which involves both - high data rates and flexible usability.
The DAQ of the COMPASS-Experiment at CERN has been adapted
for laboratory purpose with two additional modules - a trigger-logiccontroller
and a trigger-distributor - substituting the sophisticated trigger
system. In our system trigger signals are generated by a programmable
combinatoric logic in a VME-module using modern FPGA technology.
Alternatively the module can be used as a programmable prescaler. The
second module, realized in NIM-standard, provides a fan out for the trigger
signals and the experiment clock. It interfaces to the existing DAQ,
in particular to the Freiburg CATCH-module.
The DAQ system is scalable and conveniently adjustable to different
inputs due to exchangeable mezzanine cards, what makes it interesting
for a variety of experiments.
For further information:
http://hpfr02.physik.uni-freiburg.de/projects/compass/electronics
This project is supported by BMBF.
HK 14.26 Tue 10:30 Foyer Chemie
Development of the ALICE TRD Radiator — •Damian Bucher
for the ALICE-TRD collaboration — Institut für Kernphysik, Westfälische
Wilhelms-Universität, Münster, Germany
In this poster we present the design and tests of the radiator for the
ALICE Transition Radiation Detector (TRD). The ALICE TRD consists
of 540 individual detector modules which cover an overall area of about
750 m 2 . Individual modules, which consist out of a radiator followed by
a drift chamber, have entrance windows with a maximum size of about
1.2 ∗ 1.6 m 2 which are covered by the radiators.
The radiator for this detector not only has to give a very good transition
radiation yield but also acts as one of the main mechanical supporting
structures of the detector modules. The crucial goal is to keep
the entrance windows, which serve as the cathodes of the drift chambers,
within the tolerated deflection of 1 mm.
To achieve this, various materials were evaluated during several test
beamtimes and checked for their mechanical properties. The requirements
for the radiator resulting from the detector design as well as the
final foam/fibre sandwich construction are presented.
HK 14.27 Tue 10:30 Foyer Chemie
A new Data Acquisition System for COSY TOF ∗ — •A. Erhardt
1 , M. Drochner 2 , T. Sefzick 2 ,andP. Wuestner 2 for the
COSY-TOF collaboration — 1 Physikalisches Institut der Universität
Tübingen — 2 Forschungszentrum Jülich
Driven by the need for a faster data acquisition and implementation
of the delayed-pulse technique for π + identification by use of multihit
TDCs, the TOF collaboration decided to build a new data acquisition
system. The experiment messaging system (EMS) has been chosen for
several reasons: The system is successfully in use at several other experiments
at COSY and the know-how is nearby since the system has been
designed by people working at the Forschungszentrum Jülich. The new
DAQ has been installed before the August 2001 beamtime and has been
successfully used in that beamtime. This contribution shows how the different
components cooperate, how compatibility with the collaborations’
data analysis demands will be assured, and which further developments
are planned. ∗ supported by BMBF (06 TÜ 987) and DFG (European
Graduate School)
HK 14.28 Tue 10:30 Foyer Chemie
LED-Flashers for the TOF detectors — •I. Martin, P. Grabmayr,
T. Hehl, andJ. Heim — Physikalisches Institut, Univ. Tübingen
For the detection of neutrons at intermediate energies the time-of-flight
method employing fast scintillation counters is the only one which provides
sufficient resolution for precision studies. A pulser system with
Light Emitting Diodes has been developed for calibration, adjustment
and surveillance during data taking. This system has been improved
recently with blue ultra-bright LEDs. The electronic and mechanical redesign
will be presented. Results from bench test will be shown as well as
the performance during data taking at the (γ,NN) experiments at MAMI
will be discussed.
[1] T. Hehl al., Nucl. Instr. Meth. A354 (1995) 505
This work is supported by the DFG (European Graduate School Basel-
Tübingen and SPP 1034)
HK 14.29 Tue 10:30 Foyer Chemie
The Nuclear Polarization of Molecules from Recombined
Polarized Hydrogen and Deuterium Gas Atoms — •Hellmut
Seyfarth 1 , Ralf Engels 2 , Peter Kravtsov 3 , Bernd Lorentz 1 ,
Maxim Mikirtytchiants 1,3 , Hans Paetz gen. Schieck 2 , Frank
Rathmann 1 , Hans Ströher 1 , Nikolay Tchernov 3 ,andAlexandre
Vassiliev 3 — 1 Institut für Kernphysik, Forschungszentrum Jülich,
52425 Jülich, Germany — 2 Institut für Kernphysik, Universität zu
Köln, 50937 Köln, Germany — 3 High Energy Physics Department, St.
Petersburg Nuclear Physics Institute, 188300 Gatchina, Russia
During the past decade, polarized atomic H and D storage-cell gas
targets have been successfully applied at storage rings. However, a fraction
of the polarized atoms recombines in wall collisions. The nuclear
polarization, of the molecules is not directly accessible with a Breit-Rabi
polarimeter (as used at HERMES), only the polarization of the atoms
extracted from the cell can be measured. In order to overcome the resulting
systematic uncertainty in the total overall nuclear polarization
of the target gas, the nuclear polarization of recombined H2 molecules
was recently studied in a separate experiment [1]. A high value has been
found for a strong external magnetic holding field. In the framework of
an ISTC project [2], additional investigations of polarized hydrogen and
new studies of polarized deuterium molecules are being prepared. These
will also include different hyperfine state compositions and variation of
the storing conditions like material and dimensions of the cell walls.
[1] T. Wise et al., Phys. Rev. Lett. 87, 042701 (2001).
[2] International Science and Technology Center, project no. 1861.
HK 14.30 Tue 10:30 Foyer Chemie
Study of the liquid hydrogen jet properties at the ANKE pellet
target — •P. Fedorets 1 , V. Balanutsa 1 , W. Borgs 2 , M.
Büscher 2 , A. Bukharov 3 , V. Chernetsky 1 , V. Chernyshov 1 ,
M. Chumakov 1 , A. Gerasimov 1 , V. Goryachev 1 , L. Gusev 1 , Z.
Khorguashvili 4 , and S. Podchasky 1 for the ANKE collaboration
— 1 ITEP, Moscow — 2 Forschungszentrum Jülich — 3 MPEI, Moscow —
4 IPH GAS, Tbilisi
A pellet target will be utilized at the ANKE spectrometer to reach
highest luminosities with a hydrogen pellet jet crossing the stored, circulating
COSY beam. One of the main experimental tasks is to produce
a stable liquid hydrogen jet, which will further be broken into microdroplets
of about 50 µm diameter by acoustic excitation and finally freeze
into pellets. Special care has to be taken about the jet-production boundary
conditions. For this purpose jet modifications close to the triple-point
(T =14K,p = 100 mbar) were studied, since only there stable jet can
be generated. The status of the ANKE pellet target and the results of

Nuclear Physics Tuesday
the hydrogen jet investigations will be presented.
HK 14.31 Tue 10:30 Foyer Chemie
Beam Properties of the ANKE Atomic Beam Source —
•Alexandre Vassiliev1 , Reinhard Emmerich2 , Ralf Engels2 ,
Vladimir Koptev1 , Peter Kravtsov1 , Jürgen Ley2 , Bernd
Lorentz3 , Stefan Lorenz4 , Maxim Mikirtytchiants1,3 , Mikhail
Nekipelov1,3 , Hans Paetz gen. Schieck2 , Frank Rathmann3 ,
Hellmut Seyfarth3 , Erhard Steffens4 , and Hans Ströher3 — 1High Energy Physics Department, Petersburg Nuclear Physics
Institute, 188300 Gatchina, Russia — 2Institut für Kernphysik,
Universität zu Köln, 50937 Köln, Germany — 3Institut für Kernphysik,
Forschungszentrum Jülich, 52425 Jülich, Germany — 4Physikalisches Institut II, Friedrich-Alexander Universität, 91058 Erlangen, Germany
The polarized atomic beam source (ABS) will be utilized to feed the
storage-cell gas target in future experiments at the magnetic spectrometer
ANKE. The ABSproduces an intensity of (6.9 ± 0.3) · 1016 hydrogen
atoms/s in two hyperfine substates, measured with a compression tube
having the dimensions of the feeding tube of the storage-cell and installed
at its position. For future polarization studies and experiments
with polarized internal gas targets a Lamb-shift polarimeter, built at
the University of Cologne, has been installed at the ABS. First measurements
of the nuclear polarization of the atomic hydrogen beam yield
Pz =0.889 ± 0.009. In addition, measurements of the degree of dissociation
and of the beam profile at the position of the storage cell feeding
tube will be discussed.
HK 14.32 Tue 10:30 Foyer Chemie
Calibration of a Compton polarimeter in a wide energy range∗ — C. Hutter1 , •D. Galaviz1 , K. Sonnabend1 , T. Hartmann1 ,
P. Mohr1 , W. Rochow2 , K. Vogt1 , S . Volz1 , and A. Zilges1 — 1Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstraße
9, D-64289 Darmstadt — 2Physikalisches Institut, Universität
Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen
A fourfold segmented High Purity Germanium detector can be used
as Compton-polarimeter [1] in order to derive parities from photon scattering
experiments. In order to calibrate the analyzing power of the
polarimeter, (p, pγ), (p, αγ), and (α, γ) reactions have been studied in
detail.
We present a complete set of results up to a γ energy of 10 MeV.
[1] B. Schlitt et al., Nucl. Instr. and Meth. in Phys. Res. A337 (1994)
416
∗ supported by DFG (Zi 510/2-1 und FOR 272/2-1)
HK 14.33 Tue 10:30 Foyer Chemie
Ergebnisse der Streukorrektur für die PET bei der Schwerionentherapie
— •Falk Pönisch und Wolfgang Enghardt —
Forschungszentrum Rossendorf e.V., Postfach 510119, 01314 Dresden
Die Behandlung von Tumourpatienten mit 12 C-IonenwirdanderGSI
Darmstadt seit Dezember 1997 durchgeführt. Bei der Dosisapplikation
entstehen durch Wechselwirkung des Therapiestrahls mit dem bestrahlten
Gewebe β + -emittierende Nuklide. Ihre räumliche Verteilung kann
online mit dem am Strahl befindlichen Doppelkopf PET Scanner nachgewiesen
werden. Voraussetzung für eine retrospektive Kontrolle der Dosislokalisation
ist die Rekonstruktion der Radioaktivitätsverteilung aus den
Messdaten mit Hilfe eines Maximum Likelihood Expectation Maximization
(MLEM) Algorithmus. Die Comptonstreuung der Annihilationsphotonen
im Gewebe des Patienten beeinträchtigt die Abbildungstreue der
rekonstruierten Verteilung erheblich; deshalb sind die Messdaten dagegen
zu korrigieren. Die vom Strahlentherapeuten verordnete Dosis bestimmt
die Zählstatistik der PET-Studien. Die Zahl der registrierten Ereignisse
liegt 2 bis 3 Grössenordnungen unter der in der Nuklearmedizin üblichen.
Deswegen sind die dort ausgearbeiteten Verfahren der Streukorrektur
auf PET bei der Schwerionentherapie nicht anwendbar und so wurde ein
Verfahren der Streukorrektur in den MLEM-Rekonstruktionsalgorithmus
integriert. Anhand der Rekonstruktionen von Phantom- und Patientenmessungen
konnte die Richtigkeit der Methode bestätigt werden.
HK 14.34 Tue 10:30 Foyer Chemie
BunchlengthmeasurementsatELBE— •Pavel Evtushenko,
Ulf Lehnert, Peter Michel, and Jochen Teichert —
Forschungszentrum Rossendorf (FZR),Institut fuer Kern und Hadronenphysik,Postfach
510119,01314 Dresden
Last year the first ELBE accelerating module was commissioned. During
the commissioning the electron beam parameters such as transverse
emittance, energy spread and bunch length were measured. Each of them
was studied at different bunch charges as a function of RF field phase
in the first accelerating cavity. Especially for an accelerator like ELBE,
which is intended to be a driver for free electron laser (FEL), bunch length
measurement in picosecond range becomes very important and impose
some challenge. Coherent transition radiation (CTR) technique was used
to measure bunch length. This technique uses the Martin-Puplett interferometer
to measure the autocorrelation of the CTR pulse yielding a
minimum 2 ps RMSbunch length at 77pC bunch charge. Short description
of the method, experimental setup, data evaluation procedure and
results of the measurements will be presented.
HK 14.35 Tue 10:30 Foyer Chemie
Investigation of light spots and related field emission at the
S–DALINAC ⋆ — •M. Gopych, W. Beinhauer, M. Brunken, H.-
D. Gräf, T. Hartmann, M. Hertling, S.Kostial, U. Laier, A.
Lenhardt, M. Platz, A. Richter, B. Schweizer, A. Stascheck,
O. Titze, andS.Watzlawik—Inst.für Kernphysik, TU Darmstadt,
Schlossgartenstr. 9, 64289 Darmstadt
Above certain field thresholds spots of light associated with field emission
have been observed on the surface of an RF niobium superconducting
cavity at the S–DALINAC. The spectrum of the optical radiation has
been measured by an spectrometer set up on axis at the beam line exit
of the accelerator. It shows a sharp peak at 693 nm and three small ones
at about 670 nm, 705 nm, and 714 nm. Measurements of field dependence
and intensity of the light spots revealed a behaviour similar to the
electroluminescence phenomenon. Additional results of measurements
aiming at the investigation of the emission of light and related field emission
performed at the superconducting cavities will be presented.
⋆ Supported by the DFG (FOR 272/2-1 and GRK 410/2)
HK 14.36 Tue 10:30 Foyer Chemie
Trigger and Readout for the Auger-Fluorescence telescopes —
•Andreas Kopmann, Hermann-Josef Mathes, Hartmut Gemmeke,
Matthias Kleifges, Alexandre Menshikov, and Denis
Tcherniakhovski — Institut f”ur Prozessdatenverarbeitung und Elektronik,
Forschungszentrum Karlsruhe
The Pierre Auger Collaboration started with the construction of the
first hybrid detector in Argentina. In the final state this experiment will
consist of a large array of Cerenkov water detectors and 30 fluorescence
telescopes to observe fluorescence light of EAS(Extensive air shower)
with energies above 10 18 eV. Each telescope will be equipped with an
independent trigger and readout system. The combination of fast hardware
based pattern recognition and special software algorithms provide
a trigger rate of a few events per hour.
Since October 2001 two of this camera systems are operational. They
demonstrate the power of the realized concept. The actual implemented
trigger algorithms and their efficiency as well as the first data are presented.
HK 14.37 Tue 10:30 Foyer Chemie
ROOT-based off-line and on-line analysis of COSY-TOF data ∗
— •Martin Schulte-Wissermann and Leonhard Karsch for the
COSY-TOF collaboration — Institut für Kern- und Teilchenphysik, TU
Dresden, Germany
The COSY-TOF spectrometer is used to study proton-proton collisions
with up to 2.5 GeV kinetic energy. During an experiment which
lasts typically several weeks data in the order of 100 GB are stored on
tape. Due to the modular setup of the detector, which is optimized for
each individual experiment, the data analysis software has to be adapted
accordingly.
Using ROOT as the fundamental framework, we have developed a strategy
(set of rules) how to efficiently combine the contributions of all collaborators
involved in the data analysis. We provide interfaces, data
containers, and function libraries which are easy to use, robust, and well
documented. The application of these tools in the analysis of COSY-
TOF data will be demonstrated.
The usefullness of the whole concept in the on-line supervision and calibration
was shown during a recent run. ∗ Supported by BMBF and FZJ.

Nuclear Physics Tuesday
HK15 Plenary Session
Time: Tuesday 14:00–16:15 Room: Plenarsaal
Plenary Talk HK 15.1 Tue 14:00 Plenarsaal
Recent Progress in Lattice QCD — •Uwe-Jens Wiese — Institut
fuer Theoretische Physik, Universitaet Bern, Sidlerstrasse 5, CH-3012
Bern
Lattice QCD provides a framework in which one can hope to understand
the strong interactions from first principles. In this approach quark
and gluon fields are regularized nonperturbatively on a Euclidean spacetime
lattice with spacing a. In his original formulation, Wilson avoided
the fermion doubling problem at the cost of breaking chiral symmetry
explicitly at non-zero a. Recently, the fermion doubling problem has
been solved completely. In the resulting lattice fermion formulation chiral
symmetry remains exact already at non-zero a. The lattice QCD path
integral takes the form of a 4-d statistical mechanics system that can be
simulated with Monte Carlo methods. In practice, lattice QCD simulations
must reach the infinite volume limit, the continuum limit of zero
a, as well as the chiral limit of light quarks. Recent progress has been
made in all these directions. Still, the simulation of dynamical quarks remains
the bottleneck of lattice QCD calculations. D-Theory provides an
alternative formulation of lattice QCD in which Wilson’s classical link
matrices are replaced by discrete quantum links to which the efficient
meron-cluster algorithm may be applicable.
Plenary Talk HK 15.2 Tue 14:45 Plenarsaal
Chiral Extrapolation of Lattice QCD data for Baryon Properties
— •Thomas R. Hemmert — Physik Department T39, TU
München
QCD should predict basic baryon properties like masses, magnetic moments,
form factors, etc. However, these quantities are not accessible in
terms of quark-gluon perturbation theory. In this talk we focus on two
techniques—Lattice simulations of QCD and Chiral Perturbation Theory
(ChPT)—which currently begin to develop significant overlap in addressing
such questions. Baryon ChPT has been successfully applied to study
the influence of the spontaneously broken chiral symmetry on low energy
processes involving pions and nucleons. In the present context we are interested
in the explicit breaking of chiral symmetry by the finite (current-)
quark masses in low energy baryon observables. Such observables can be
calculated in computer simulations on a finite space-time grid—Lattice
QCD. However, these simulations are usually not performed with realistic
small quark masses as the simulation of full QCD with three light
flavors u, d, s is technically quite challenging. For reasons of numerical
stability it is standard practice in Lattice QCD to work with sets of quite
heavy quark masses and then extrapolate the results to physical quark
masses. We will show that ChPT via its built-in explicit breaking of chiral
symmetry can provide guidance for this extrapolation procedure that
goes beyond the traditionally used linear ansatz. Furthermore, we discuss
extensions of standard baryon ChPT to so called (partially-) quenched
baryon ChPT that allow to estimate the size of artificial modifications of
HK16 Theory II
baryon properties due the use of the “quenching” simplification.
Plenary Talk HK 15.3 Tue 15:15 Plenarsaal
Electric dipole strength in atomic nuclei – a key to the breaking
of isospin symmetry — •Andreas Zilges — Institut für Kernphysik,
TU Darmstadt, Schlossgartenstrasse 9, D-64289 Darmstadt, Germany
A global or local breaking of the symmetry of proton and neutron distributions
in nuclei leads to electric dipole excitations. The most prominent
feature is the Giant Dipole Resonance (GDR) at energies of about
15 MeV. At the other end of the energetic scale a bound two phonon
octupole–quadrupole excitation has been established as a fundamental
E1 mode around 4 MeV in all medium and heavy mass nuclei.
In recent photon scattering experiments at the Superconducting Darmstadt
Linear Accelerator S–DALINAC we investigated several nuclei near
shell closures in the energy range between the two phonon state and the
neutron threshold. Collective electric dipole strength exhausting up to
one percent of the energy weighted sum rule has been observed. These
excitations are clearly separated from the GDR. Possible interpretations
in terms of a local breaking of isospin symmetry and the influence of a
neutron skin will be discussed.
∗ supported by the DFG (contracts Zi 510/2-1 and FOR 272/2-2).
Plenary Talk HK 15.4 Tue 15:45 Plenarsaal
Nuclear Physics with a Free Electron LASER $ — •N. Pietralla
— Institut für Kernphysik, Universität zu Köln — WNSL, Yale University,
U.S.A.
The electron storage ring at the Duke Free Electron LASER Laboratory
operates at electron energies between 0.2 and 1.1 GeV. Its beam
drives the OK-4 Free Electron LASER with tunable wavelengths in the
optical range. The high photon density inside of the optical cavity enables
one to obtain a large luminosity for Compton scattering processes
between the polarized optical LASER photons and the relativistic electrons
in the ring. Compton scattered photons experience a forwardpeaked
Lorentz-boost by a factor of 106 –108 by transformation to the lab
system and they form after collimation a nearly monochromatic, tunable,
completely polarized γ-ray beam with an intensity of up to 109 γ’s/sec.
This “High Intensity γ-ray Source” (HIγS), with a degree of linear polarization
of Pγ > 99% and a narrow band width of ∆Eγ/Eγ < 4%,
offers new conditions for experiments with photo-nuclear reactions, e.g.,
for the photo-disintegration of the deuteron or for Nuclear Resonance
Fluorescence (NRF) close to the particle emission threshold. First NRF
experiments have recently been performed [1] at HIγS. Parity quantum
numbers of J = 1 states of 138Ba and 88Sr have been measured. The results
demonstrate the experimental progress made by the new technique.
[1] N.Pietralla et al., Phys. Rev. Lett. 88 (2002), in press.
$
Supported by the U.S.-DOE and by the Emmy Noether-Programm of the DFG
under contract Pi 393/1.
Time: Tuesday 16:45–18:45 Room: A
Group Report HK 16.1 Tue 16:45 A
Glueballs and Instantons — •Hilmar Forkel — Institut für Theoretische
Physik, Uni Heidelberg, Philosophenweg 19, 69120 Heidelberg
The impact of QCD instantons on scalar glueball properties is studied
in the framework of an instanton-improved operator product expansion
(IOPE) for the 0 ++ glueball correlation function. Direct instanton contributions
are found to strongly dominate over those from perturbative fluctuations
and soft vacuum fields. All IOPE sum rules, including the one
involving a subtraction constant, show a high degree of stability and are,
in contrast to previous glueball sum rules, consistent with the low-energy
theorem for the zero-momentum correlator. The predicted glueball mass
mG =1.53 ± 0.2 GeV is less sensitive to the instanton contributions then
the glueball coupling (residue) fG =1.01 ± 0.25 GeV, which increases by
about half an order of magnitude. Both glueball properties are shown
to obey scaling relations as a function of the average instanton size and
density.
HK 16.2 Tue 17:15 A
Scale setting with Hypercubic Blocking — •Roland Hoffmann
— Institut für Theoretische Physik, Universität Regensburg, Universitätsstrasse
31, D-93053 Regensburg
We measure the static potential from Wilson loops constructed using
hypercubic blocked (HYP) links. The HYP smearing mixes gauge
links within hypercubes attached to the original link only. The HYP
potential agrees with the potential measured using thin links for distances
r/a ≥ 2. We calculated the lowest order perturbative expansion
of the lattice Coulomb potential of HYP links. These results are used
in analyzing the static potential with Wilson’s action as well as with the
Lüscher-Weisz action. The statistical accuracy of the potential with HYP
links improves by about an order of magnitude, which makes it possible
to determine a reliable scale even with limited statistics.

Nuclear Physics Tuesday
HK 16.3 Tue 17:30 A
Spectral Function of Quarks in Quark Matter — •Frank
Frömel, Stefan Leupold, and Ulrich Mosel — Institut für
Theoretische Physik, Universität Gießen, Germany
We investigate the spectral function of light quarks in infinite quark
matter using a simple albeit self-consistent model. Relations between
correlation functions and collision rates are used to calculate the spectral
function in an iterative process. Similar calculations have already
been performed for nucleons in nuclear matter [1]. It was found there
that this approach reproduces the results of many-body theory using a
pointlike nucleon interaction with constant scattering amplitude. In our
calculations the interactions between the quarks are described by the
SU(2) Nambu–Jona-Lasinio model. We apply this method to calculate
the quark spectral function at zero temperature and finite chemical potential.
Work supported by DFG.
[1] J. Lehr, H. Lenske, S. Leupold, U. Mosel, nucl-th/0108008
HK 16.4 Tue 17:45 A
Chiral symmetry restoration and the Z3 sectors of QCD —
•Wolfgang Söldner, Christof Gattringer, P.E.L. Rakow,
and Andreas Schäfer — Institut für Theoretische Physik, Universität
Regensburg, D-93040 Regensburg, Germany
Quenched SU(3) lattice gauge theory shows three phase transitions,
namely the chiral, deconfinement and Z3 phase transition. Knowing
whether or not the chiral and deconfinement phase transition occure at
the same temperature for all Z3 sectors could be crucial to understand the
underlying microscopic dynamics. We find that the spectral gap opens
up at the same critical temperature in all Z3 sectors in contrast to earlier
claims in the literature.
HK 16.5 Tue 18:00 A
Thermal QCD on the Lattice: Quasiparticles And Confinement
— •Roland A. Schneider 1 and Wolfram Weise 1,2 — 1 Physik-
Department, Technische Universität München, Garching, Germany —
2 ECT*, Villazzano (Trento), Italy
We propose a novel quasiparticle interpretation of the equation of state
of deconfined QCD at finite temperature. Using appropriate thermal
masses, we introduce a phenomenological parametrization of the onset
HK17 Nuclear Physics / Spectroscopy II
of confinement in the vicinity of the predicted phase transition. Lattice
results of the energy density, the pressure and the interaction measure of
pure SU(3) gauge theory are excellently reproduced. We find a relationship
between the thermal energy density of the Yang-Mills vacuum and
the chromomagnetic condensate 〈B 2 〉T. Finally, an extension to QCD
with dynamical quarks is discussed. Good agreement with lattice data
for 2, 2+1 and 3 flavour QCD is obtained. We also present the QCD
equation of state for realistic quark masses. Applications to dilepton
production in heavy-ion collisions are outlined. Published in Phys. Rev.
C64 (2001) 055201.
Work supported in part by BMBF and GSI.
HK 16.6 Tue 18:15 A
Kaons in nuclear matter — •Thomas Roth, Michael Buballa,
and Jochen Wambach — Institut f. Kernphysik, TU Darmstadt
We investigate the modification of Kaons in isospin symmetric and
non symmetric nuclear matter. Using the leading s-wave couplings of
the SU(3) chiral meson-baryon Lagrangian we solve the coupled channel
Kaon-nucleon scattering equation selfconsistently.
We obtain a description of the in medium properties of the Kaonnucleon
scattering amplitude dominated by the Λ(1405) resonance. The
in-medium Kaon propagator is calculated for different densities and different
proton-neutron mixtures.
While the Λ(1405) resonance is little affected by increasing density, we
find that the Kaon mass experiences a strong downward shift. This will
be important for the concept of Kaon condensation in neutron stars.
HK 16.7 Tue 18:30 A
Alpha Cluster Condensation in 12 Cand 16 O — •G. Röpke 1 , A.
Tohsaki 2 , H. Horiuchi 3 ,andP. Schuck 4 — 1 FB Physik, Universität
Rostock, D-18051 Rostock, Germany — 2 Department of Fine Materials
Engineering, Shinshu University, Ueda 386-8567, Japan — 3 Department
of Physics, Kyoto University, Kyoto 606-8502, Japan — 4 Institut de
Physique Nucleaire, F-91406 Orsay Cedex, France
Anewα-cluster wave function is proposed which is of the α-particle
condensate type. Applications to 12 Cand 16 O show that states of low
density close to the 3 and 4 α-particle thresholds in both nuclei are possibly
of this kind. It is conjectured that all self-conjugate 4n nuclei may
show similar features.
Time: Tuesday 16:45–18:45 Room: B
Group Report HK 17.1 Tue 16:45 B
Peculiar Properties of Deformed Odd-Odd N = Z Nuclei —
•Alexander Lisetskiy, N. Pietralla, K. Jessen, I. Schneider,
A. Schmidt, andP. von Brentano — Institut für Kernphysik, Universität
zu Köln, D-50937 Köln, Germany
The near degeneracy of the states with total isospin quantum numbers
T =0andT = 1 in odd-odd N=Z nuclei and very strong magnetic
dipole (M1) transitions between them [1,2] are among the most interesting
phenomena observed in N = Z nuclei. Furthermore the nuclei
along the N = Z line offer a possibility to estimate the isospin mixing
in the low-lying states from electromagnetic transition strengths. In the
present work we analyze recent data and theoretical results on the structure
of the odd-odd N=Z nuclei 46 V, 50 Mn, and 54 Co [1-4]. New data in
combination either with the full pf-shell model or with collective rotorplus-quasideuteron
model results help to establish systematic regularities
for isovector M1 transitions, to reveal collective band structures in deformed
odd-odd N = Z nuclei 46 Vand 50 Mn, and to estimate the small
isospin mixing (0.4 %) between low-lying states with T =1andT =0
in the odd-odd N = Z nucleus 54 Co.
[1] A. F. Lisetskiy et al., Phys. Rev.C60, 064310 (1999).
[2] A. F. Lisetskiy et al., Phys. Lett. B 512, 290 (2001).
[3] I. Schneider et al., Phys.Rev.C61, 044312 (2000).
[4] N. Pietralla et al., Phys. Rev.C65, in press (2002).
Group Report HK 17.2 Tue 17:15 B
High-accuracy mass measurements on N = Z nuclei using
ISOLTRAP — •Frank Herfurth 1 , F. Ames 2 , G. Audi 3 , D.
Beck 4 , K. Blaum 4 , G. Bollen 5 , A. Kellerbauer 1 , H.-J. Kluge 4 ,
D. Lunney 3 , R.B. Moore 6 , D. Rodrígez 4 , E. Sauvan 1 , C.
Scheidenberger 4 , S.Schwarz 5 , G. Sikler 4 , C. Weber 4 ,andthe
ISOLDE-Collaboration 1 — 1 CERN, Geneva — 2 LMU, Munich
— 3 CSNSM, Orsay — 4 GSI, Darmstadt — 5 NSCL, East Lansing —
6 McGill Univ., Montreal
ISOLTRAP is a Penning trap mass spectrometer installed at the online
mass separator ISOLDE at CERN/Geneva. It serves for highaccuracy
mass measurements of radioactive nuclides by determining their
cyclotron frequency. After high-accuracy mass measurements on 74 Rb,
74 Kr and 34 Ar, the mass of 32 Ar was measured recently. A relative uncertainty
below 10 −7 was reached despite the short half-life of only 98 ms.
This mass value is needed in the context of the search for scalar contributions
to the standard model of weak interactions [1]. The experimental
QEC value for the 32 Ar superallowed β decay has now the required uncertainty
of only a few keV. 72 Kr is one of the two waiting point nuclei that
define the speed of the astrophysical rp-process beyond A = 64. Among
other things, its mass is an important input for the correct understanding
and modeling of the rp-process in this region. The mass of 72 Kr was
measured with a relative uncertainty of about 10 −7 .
[1]E.G.Adelbergeret al., Phys. Rev. Lett. 83, 1299 and 3101 (1999)
.

Nuclear Physics Tuesday
HK 17.3 Tue 17:45 B
Study of the oblate deformed g9/2 band in the N=Z+1 nucleus
69 Se — •I. Stefanescu 1 , J. Eberth 1 , G. Gersch 1 , T. Steinhardt
1 , O. Thelen 1 , N. Warr 1 , D. Weisshaar 1 , G. de Angelis
2 , T. Martinez 2 , D. Curien 3 , K.P. Lieb 4 , A. Jungclaus 4 , R.
Schwengner 5 ,andE. Stefanova 5 for the Euroball collaboration —
1 Institut für Kernphysik, Zülpicherstr. 77, D-50937 Köln, Germany —
2 Laboratori Nazionali INFN, I-35020 Legnaro, Italy — 3 CRN Strasbourg,
F-67037 Strasbourg, France — 4 II. Phys. Institut, Universität Göttingen,
D-37073 Göttingen, Germany — 5 Inst. für Kern- und Hadronenphysik ,
Forschungszentrum Rossendorf, Germany
The γ-ray transitions in the 69 Se nucleus have been investigated in the
40 Ca( 32 S,2pn) 69 Se reaction at 105 MeV using the Euroball array coupled
with ancillary detectors. The target consisted of a 800 µg/cm 2 99.965 %
enriched self-suporting 40 Ca foil.
The level scheme of 69 Se has been established by means of particlegated
γ-γ and γ-γ-γ coincidences up to 13.7 MeV and J π =53/2 + for the
prolate-deformed band which crosses the oblate band built on the g9/2
orbital. Some new lines have also been added to the structure resulting
from the coupling of one octupole phonon to the 9/2 + state in the prolate
band.
The spins of the levels were deduced, whenever possible, from the analysis
of the directional correlation ratios from oriented states (DCO) using
the γ-γ and the neutron-γ-γ events.
Funded by German BMBF under Contract No. 06OK958.
HK 17.4 Tue 18:00 B
Nature of the Scissors Mode near Shell Closure ⋆ — •P. von
Neumann-Cosel 1 , E. Guliyev 2 , F. Hofmann 1 , A.A. Kuliev 3 ,and
A. Richter 1 — 1 Institut für Kernphysik, Technische Universität Darmstadt
— 2 Department of Engineering Physics, Ankara University, Turkey
— 3 Department of Physics, Sarkara University, Turkey
While the global features of the scissors mode in heavy nuclei are quite
well understood, peculiarities remain to be solved in nuclei near shell
closure. There, the simple geometrical picture of a scissors-like motion
of deformed proton and neutron bodies breaks down. Two examples
are discussed. QRPA calculations of the low-energy dipole strength in
122−130 Te are reported which provide new insight into the complex distributions
which cannot be understood in spherical models. The extracted
deformation dependence of the scissors mode strength is discussed with
respect to various models. Another interesting case are the 194,196 Pt isotopes
in the region of γ-softness near the N = 126 shell gap. Photon
scattering experiments surprisingly suggest an upward shift of the scissors
mode centroid in 194 Pt by about 500 keV with respect to the sys-
HK18 Nuclear and Particle Astrophysics II
tematics in rare-earth nuclei. First microscopic calculations of the M1
and E1 strengths in 194,196 Pt are presented using the above model.
⋆ Supported by the DFG under contract FOR 272/2-1.
HK 17.5 Tue 18:15 B
Phase transitions and two-neutron separation energies in
algebraic models — •Ruben Fossion 1 , Kris Heyde 1 , and
Jose-Enrique Garcia-Ramos 2 — 1 Department of Subatomic
Physics, University of Gent, Proeftuinstraat,86 B-9000 Gent(Belgium)
— 2 Departamento de Fiscia Aplicada. EPSLa Rabida, Universidad de
Huelvam 21819 Palos de la Frontera (Spain)
In the last few years, interest for the study of phase transitions and
phase coexistence in atomic nuclei has been revived, in particular making
use of algebraic methods such as the Interacting Boson Model (IBM).
In the present study we consider the three transitional regions in which
one observes rapid structural changes i.e. (a) the Nd-Sm-Gd region, (b)
the Ru-Pd region and, (c) the Os-Pt region. Although these regions
have been studied extensively emphasizing excited state properties, not
so much attention has been given, up to now, concerning possible phase
transitions in the nuclear ground-state properties.
In this work, a new type of plot is presented that allows the study of
phase transitions in finite systems, such as atomic nuclei. This approach
allows to establish a connection between excited-state properties and
binding energies. It can be shown that the binding energy and in particular
the 2-neutron separation energy presents a very sensitive observable
that allows to discriminate between apparently equivalent Hamiltonians.
We also present results on the systematics of 2-neutron separation energies
in long chains of isotopes.
HK 17.6 Tue 18:30 B
Cluster interpretation of the properties of the alternating parity
bands in actinides — •T.M. Shneidman 1,2 , G.G. Adamian 1,2,3 ,
N.V. Antonenko 1,2 , R.V. Jolos 1,2 , 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
— 3 Institute of Nucear Physics, Tashkent 702132, Uzbekistan
A cluster model interpretation is suggested for the properties of the
alternating parity bands in Ra, Th and U isotopes, which includes a
description of the parity splitting [1] and the Eλ (λ=1,2,3) transition
probabilities. The mass asymmetry and relative distance coordinates are
the most important variables of the model. The characteristics of the
Hamiltonian used are determined in investigations of heavy ion reactions
at low energies.
[1] T.M.Shneidman et al., Phys.Lett. B(2002), in press.
Time: Tuesday 16:45–18:45 Room: C
Group Report HK 18.1 Tue 16:45 C
Nuclear Input Data for the r-Process: Cosmochronometer for
Old Halo Stars — •B. Pfeiffer 1 , K.-L. Kratz 1 , H. Schatz 2 ,and
J.J. Cowan 3 — 1 Inst. f. Kernchemie, Univ. Mainz — 2 NSCL, Michigan
State Univ., East Lansing, USA — 3 Dep. of Phys. and Astr., Univ.
Oklahoma, Norman, USA
The description of the rapid neutron-capture process (r-process) requires
environments with a high neutron density, where neutron captures
are faster than β-decays, even for unstable nuclei up to 15 - 30 units from
stability near the neutron drip-line. These exotic nuclei with a large neutron
excess are of considerable interest not only for astrophysics but for
nuclear structure studies. They experience dramatic changes giving rise
to new shell structures characterized by vanishing gaps [1].
The updated nuclear physics input is applied for classical r-process
models. The calculated abundances are compared to new observations
of extremely metal-poor, old stars in the Galactic halo. The observed
abundances for heavier neutron-capture elements (including the third rprocess
peak elements) are consistent wth a scaled solar system distribution.
Our theoretical production value for Th/U ratio combined with the
new observations make more reliable chronometric age estimates possible
[2]. These ages are lower limits for the age of the Universe.
[1] B. Pfeiffer et al., Nucl. Phys. A693, 282 (2001)
[2] R. Cayrel et al., Nature 409, 691 (2001); J.J. Cowan et al., submitted
to Ap. J.
HK 18.2 Tue 17:15 C
Measurement of the 197 Au(γ,n) 196 Au cross section close above
the reaction threshold ∗ — •P. Mohr, K. Vogt, M. Babilon,
W. Bayer, T. Hartmann, C. Hutter, K. Lindenberg, K.
Sonnabend, S . Volz, and A. Zilges — Institut für Kernphysik,
Technische Universität Darmstadt, D-64289 Darmstadt, Germany
Recently, the interest in (γ,n) reactions has been revived because of
their astrophysical relevance for the nucleosynthesis of neutron-deficient
p nuclei [1]. It has been shown that the astrophysical (γ,n) reaction rate
depends on the (γ,n) cross section only in narrow energy window – a
Gamow-like window – above the (γ,n) threshold [1,2]. We have measured
(γ,n) reaction rates for several nuclei in a quasi-thermal photon
bath at typical temperatures of a supernova explosion [1,3].
The cross section of the reaction 197 Au(γ,n) 196 Au has been measured at
the S-DALINAC close above the reaction threshold at Ethr =8.071 MeV
using the method of photoactivation. From a combination of our result
and data from literature [4] we derive the 197 Au(γ,n) 196 Au cross section
from threshold to the giant dipole resonance with very small uncertainties.
This cross section can be used as standard in future experiments.
[1] P. Mohr et al., Phys. Lett. B 488, 127 (2000).
[2] P. Mohr et al., Nucl.Phys.A688, 82c (2001).
[3] K. Vogt et al., Phys.Rev.C63, 055802 (2001).
[4] B. L. Berman et al., Phys.Rev.C36, 1286 (1987); A. Veyssiere et
al., Nucl.Phys.A159, 561 (1970); G. M. Gurevich et al., Nucl.Phys.
A351, 257 (1981); H. Utsunomiya et al., to be published.

Nuclear Physics Tuesday
∗ supported by DFG (contracts Zi 510/2-1 and FOR 272/2-1).
HK 18.3 Tue 17:30 C
Resonance strengths for the reaction 28 Si(α, γ) 32 S at low energies
— •M. Babilon, T. Hartmann, C. Hutter, P. Mohr,
K. Sonnabend, K. Vogt, S.Volz,andA. Zilges — Institut für
Kernphysik, Technische Universität Darmstadt, Schlossgartenstrasse 9,
D-64289 Darmstadt, Germany
Silicon burning is supposed to be the dominant mechanism for element
synthesis in the mass range A = 28-65. Capture reactions like (α, γ),
(p,γ), (n,γ) and the inverse photodisintegration processes are involved
[1].
During a calibration of a Compton polarimeter [2] γ-decays of eight resonances
in the 28 Si(α, γ) 32 Sreaction have been studied. The results for resonance
strengths and decay branches from previous measurements [3-5]
were verified, and in several cases the uncertainties in resonance strengths
could be significantly reduced.
∗ supported by the DFG (contracts Zi510/2-1 and FOR272/2-1)
[1] C. E. Rolfs, W. S. Rodney, ”Cauldrons in the Cosmos” (1988)
[2] C. Hutter et al., this conference
[3]D.W.O.Rogersel al., Nucl.Phys.A281, 345 (1977)
[4]J.W.Toevsel al., Nucl.Phys.A172, 589 (1971)
[5]P.J.M.Smuldersel al., Physica30, 1197 (1964)
HK 18.4 Tue 17:45 C
Determination of the (n,γ) reaction rate of unstable 185 W
in the astrophysical s-process via its inverse reaction — •K.
Sonnabend, P. Mohr, K. Vogt, M. Babilon, W. Bayer, D.
Galaviz, T. Hartmann, C. Hutter, S.Volz,andA. Zilges —
Institut für Kernphysik, Technische Universität Darmstadt, D-64289
Darmstadt, Germany
The β-unstable isotope 185 W is a branching point in the astrophysical
s-process. Therefore the ratio of the (n,γ) reaction rate and β-decay rate
of 185 W is of common interest. We have measured the inverse reaction
186 W(γ,n) 185 W due to the experimental difficulties in measuring the (n,γ)
reaction rate of an unstable isotope directly. Our preliminary result is
in agreement with theoretical predictions for the (γ,n) cross section [1]
and available data [2-4]. Therefore, the predicted (n,γ) cross section under
s-process conditions of about 700 millibarn and the derived neutron
density [5] are confirmed.
∗ supported by the DFG (contracts Zi510/2-1 and FOR272/2-1)
[1] T. Rauscher, F.-K. Thielemann, At. Data Nucl. Data Tables 75, 1
(2000)
[2] B.L. Berman et al., Phys. Rev. 185, 1576 (1969)
[3] A.M. Goryachev, G.N. Zalesnyĭ, IZV. An. KazSSR 6, 8 (1978)
[4] G.M. Gurevich et al., Nucl. Phys. A351, 257 (1981)
[5] F. Käppeler et al., ApJ. 366, 605 (1991)
HK 18.5 Tue 18:00 C
Electron Screening in Metals — •Francesco Raiola, Claus
Rolfs, andFrank Strieder for the LUNA collaboration — Institut
für Experimentalphysik III, Ruhr-Universität Bochum
Recently, the electron screening effect on the d(d,p)t reaction has been
studied in the metals Al, Zr, and Ta, where deuterated metals were produced
via implantation of low-energy deuterons. The resulting S(E) data
show the well known exponential enhancement, however the extracted
electron screening potential values Ue are one order of magnitude larger
than the values found in the corresponding gas-target experiment as well
as that predicted from the adiabatic limit. In a new measurement at the
100 kV accelerator at the Ruhr-Universität Bochum the observation of
the large electron screening effect in the d(d,p)t reaction using a deuterated
Ta target has been confirmed using somewhat different experimental
approaches. Studies using other deuterated metals are on the way and
new results will be presented in this talk.
HK 18.6 Tue 18:15 C
ERNA: a status report — •Daniel Schürmann for the ERNA
collaboration — Institut für Experimentalphysik III, Ruhr-Universität
Bochum, Universitätsstr. 150, 44780 Bochum
The European Recoil Separator for Nuclear Astrophysics (ERNA) is
currently in an advanced stage of construction and testing at the Dynamitron
Tandem Laboratory of the Ruhr-Universität Bochum. It is
mainly devoted to a new measurement of the astrophysically important
12 C(α, γ) 16 O reaction cross section. Exploiting the separation of beam
and recoil ions one measures the total cross section. Furthermore it is
possible to clean up the γ-ray spectra by coincidence techniques and
obtain information about the γ-ray angular distribution. Key parameters
characterising the separator are the suppression factor of the carbon
beam and the recoil acceptance. Measurements of these quantities and
comparison with optical calculations are presented.
HK 18.7 Tue 18:30 C
The Trojan-Horse Method in Nuclear Astrophysics — •Stefan
Typel 1 und Hermann Wolter 2 — 1 NSCL/Michigan State University,
USA — 2 University of Munich, Germany
The Trojan-Horse method (THM) is an indirect way to determine the
energy dependence of nuclear cross sections at the very low energies of
astrophysical interest. In this method the Coulomb barrier in the astrophysical
reaction is effectively reduced by adding a spectator to one of the
participating nuclei and by studying the breakup of the final three-body
system in the particular region of the phase space where the momentum
transfer to the spectator is small. In the plane-wave impulse approximation
the cross section is a product of three factors: (1) a kinematical
factor, (2) a momentum distribution, (3) an off-shell two-body cross section.
The relation of the latter to the on-shell cross section was previously
assumed in a heuristic approximation. We present inprovements in the
theoretical description of the process starting from a distorted wave Born
approximation. It yields a simple connection between the on-shell and
off-shell cross sections. Applications of the THM in recent experiments,
e.g. 7 Li(p,α)α and 6 Li(d,α)α, are discussed.
HK19 Electromagnetic and Hadronic Probes II
Time: Tuesday 16:45–18:45 Room: D
Group Report HK 19.1 Tue 16:45 D
Meson Spectroscopy with BABAR∗ — •Klaus Götzen for
the BABAR collaboration — Institut für Experimentalphysik I,
Ruhr-Universität Bochum
The high luminosity of PEP-II in combination with the vertexing possibilities
of the BABAR-Detector offers unique opportunities on light
meson spectroscopy. The basic interest in this domain is the search for
exotic states. In order to find those, the spectrum of conventional mesons
must be precisely known. Earlier analyses were not able to resolve all
ambiguities arising because of overlapping states. Some ambiguities can
be resolved using a clean initial state which restricts the final state to
specific quantum numbers, such as the weak decays of D ± s
-mesons into
three pseudoscalars, allowing only a few resonances to occur.
Discussed in particular are the decays D ± s → K0 S K0 S π± and D ± s →
π + π − π ± , and the data selection and Dalitz plot analyses are presented.
These decays are of particular interest for the discussion of the existence
and the spin of isoscalar resonances above 1.5 GeV/c 2 .Inthismassre-
gion the glueball ground state is conjectured to lie and might mix strongly
with other isoscalar J PC =0 ++ -states.
∗ supported by the BMB+F
Group Report HK 19.2 Tue 17:15 D
Measurement of time–dependent CP–Asymmetries in B 0 –
mesondecays to CP–eigenstates and studies of charmonium
decays of B–mesons — •Jens Brose for the BABAR collaboration
— Institut für Kern- und Teilchenphysik, TU Dresden, 01062 Dresden
The BABAR detector, at the PEP-II asymmetric B-meson factory at
SLAC collected a sample of 52 events/fb whilst operating at energies near
the Υ(4S) resonance in 2000/2001.
A study of time-dependent CP–asymmetries in events where one neutral
B meson is fully reconstructed in a charmonium final state (J/ΨK 0 S,
J/ΨK 0 L , Ψ(2S)K0 S , χc1K 0 S and J/ΨK∗0 (K ∗0 → K 0 S π0 )) is presented.
Since the final state J/ΨK ∗0 is an admixture of CP-even and CPodd
states, an analysis of the different decay amplitudes is necessary.

Nuclear Physics Tuesday
The results of this analysis are reported together with measurements of
B → charmonium branching fractions.
HK 19.3 Tue 17:45 D
Hard exclusive electroproduction of real photons and π + on the
proton at HERMES — •Björn Seitz for the HERMEScollaboration
— II. Physikalisches Insitut, Justus–Liebig Universität Giessen,
Heinrich–Buff Ring 16, 35392 Giessen, F.R.G.
The production of mesons (or photons) in deep–inelastic lepton scattering
gives access to information on the structure of hadrons that is
otherwise hard to obtain. When the production process involves at least
on hard scale and is exclusive, the data can be interpreted in terms of
the recently introduced generalized parton distributions (GPDs). These
GPDs provide a unified description of hadronic structure, which can be
applied to many different reactions.
Single Spin Asymmetries in the hard, exclusive electroproduction of
real photons (DVCS) and π + on the proton have been measured for the
first time by HERMES. Sizeable asymmetries for DVCS using a polarized
beam and unpolarized target have been observed. A large asymmetry
using an unpolarized beam and a longitudinal polarized target has been
observed in the exclusive electroproduction of π + . These data provide a
first testing ground for the GPD formalism.
HK 19.4 Tue 18:00 D
Azimuthal asymmetries in pion and kaon production in SIDIS
off longitudinally polarized proton and deuterium targets at
HERMES — •Peter Schweitzer 1 , Klaus Goeke 2 ,andAnatoli
Efremov 3 — 1 Dipartimento di Fisica Nucleare e Teorica, Universitá
degli Studi di Pavia, Pavia, Italy — 2 Institut für Theoretische Physik
II, Ruhr-Universität Bochum, Germany — 3 Joint Institute for Nuclear
Research, Dubna, 141980 Russia
Recently azimuthal asymmetries in pion production from SIDIS off
a polarized proton target have been measured by HERMESand SMC.
New HERMESdata from a longitudinally polarized deuetrium target
will be released soon (possibly in February). The asymmetries can be
explained by the Collins effect and contain information on the transversity
distribution function and the T-odd Collins’ fragmentation function.
Recently a very successful approach has been developed which is based
on 2 ingredients and explains well existing data and allows unambigous
predictions for new experiments with no free parameters. Ingredient (1)
HK20 Heavy Ions II
is experimental information on the Collins fragmentation function from
DELPHI. Ingredient (2) are results from non-perturbative calculations
of the transversity distribution function in the chiral quark soliton model
and in the instanton model of the QCD-vacuum.
HK 19.5 Tue 18:15 D
Extraction of polarized quark distributions of the nucleon at
HERMES — •Brecht Hommez — University of Gent, Proeftuinstraat
86, B 9000 Gent, Belgium
New results from the HERMESexperiment on polarized quark distributions
for the valence and the sea quarks in the nucleon will be presented.
The HERMESexperiment has measured double spin asymmetries in
the cross section for deep-inelastic scattering of longitudinal polarised
positrons off longitudinal polarised hydrogen and deuterium targets.
From these asymmetries, based on inclusive and semi-inclusive measurements,
polarised quark distributions were extracted as a function of x.
Since 1998, a dual-radiator Ring Imaging Cherenkov detector has been
installed in HERMES, which allows the identification of kaons, pions and
protons over almost the entire kinematic range of the experiment. Semiinclusive
kaon asymmetries will provide an enhanced sensitivity on the
polarisation of the strange sea quarks in the sea.
HK 19.6 Tue 18:30 D
η photo- and electroproduction on nucleons — •Eugenio
Marco, Bugra Borasoy, and Stefan Wetzel — Physik-
Department, Technische Universität München
The Swave contribution to photo- and electroproduction of the η ′ meson
on both the proton and neutron is investigated within a relativistic
chiral unitary approach based on coupled channels. We work with an
effective chiral Lagrangian which includes the η ′ as an explicit degree
of freedom and incorporates important features of the underlying QCD
Lagrangian such as the axial U(1) anomaly. Unitarity constraints are imposed
in performing the resummation of the amplitudes obtained from
chiral perturbation theory and cross sections of η ′ photo- and electroproduction
from nucleons are obtained. The investigation of the η ′ -nucleon
system may offer new insights into the role of gluons in chiral dynamics.
Work supported in part by the DFG and the Alexander von Humboldt
Foundation.
Time: Tuesday 16:45–18:45 Room: E
Group Report HK 20.1 Tue 16:45 E
The Compressed Baryonic Matter experiment at the future
facility at GSI — •Volker Friese 1 , Anton Andronic 1 , Peter
Braun-Munzinger 1 , Christian Finck 1 , Bengt Friman 1 , Norbert
Herrmann 2 , Romain Holzmann 1 , Wolfgang Koenig 1 ,
Matthias Lutz 1 , Peter Senger 1 , Yanghwan Shin 1 , Reinhard
Simon 1 , Herbert Ströbele 3 , and Joachim Stroth 1,3 — 1 GSI
Darmstadt — 2 Univ. Heidelberg — 3 Univ. Frankfurt
A major field of research at the proposed accelerator facility at GSI will
be the production and investigation of super-dense strongly-interacting
matter. The exploration of the QCD phase diagram in the region of high
baryon densities is complementary to the studies of matter at high temperatures
performed at the CERN-SPS, RHIC and the future LHC. The
planned experimental program will focus on diagnostic probes which have
not been measured before in the beam energy range between 2 and 40
AGeV: light vector mesons decaying into electron-positron pairs, hidden
and open charm and multi-strange hyperons. In addition, hadronic observables
such as protons, pions and kaons will be detected with large acceptance.
The experimental challenge is the efficient identification of rare
probes (both hadrons and electrons) embedded in events with charged
particle multiplicities of up to 1000 at reaction rates of up to 10 MHz.
The proposed layout of the detector system and performance simulations
will be presented.
Group Report HK 20.2 Tue 17:15 E
Kaon and Antikaon Production in Nucleus-Nucleus Collisions
at SIS Energies — •Florian Uhlig for the KaoScollaboration —
TU Darmstadt
The study of the
properties of hadrons in dense matter and the nuclear equation-of-state
at high baryon densities represents a major goal of today’s
heavy-ion collision experiments.
The production of strange particles
serves as a sensitive tool for probing both issues [1][2].
Systematic measurements of kaons and antikaons emitted in C+C,
Ni+Ni
and Au+Au collisions were performed with the Kaon Spectrometer
KaoSat
SIS/GSI. The particle yields were determined as function of momentum,
collision centrality and emission angle. Of particular interest with
respect to in-medium effects is the azimuthal emission pattern of
kaons and antikaons. Recent results will be presented.
[ ∗ ] supported by BMBF and GSI
[1] F. Laue, C. Sturm et al., Phys. Rev. Lett. 82 (1999) 1640
[2] C.Sturm et al., Phys. Rev. Lett. 86 (2001) 39
HK 20.3 Tue 17:45 E
Measurement of long-lived strange resonances in FOPI ∗ —
•Markus Merschmeyer for the FOPI collaboration — Physikalisches
Institut der Universität Heidelberg
K 0 and Λ have been measured in the reactions Ni+Ni at 1.93 AGeV
and Ru+Ru at 1.69 AGeV. Spectra and rapidity distributions are discussed
and point, as is the case for charged kaons, in the theoretical
description to the necessity for introducing in-medium potentials. Further
information on this topic can be gained from the investigation of
subthreshold production of double strange baryons at SIS energies. The

Nuclear Physics Tuesday
capability of the FOPI detector for measuring Ξ − and theoretical predictions
from thermal model calculations are presented.
∗ supported by BMBF (06HD953) and GSI (HD-PEL)
HK 20.4 Tue 18:00 E
Direct Measurement of Delta Production in 40 Ar + nat Ca at
0.8A GeV — •Ana Marin for the TAPScollaboration — Gesellschaft
für Schwerionenforschung, D-64291 Darmstadt, Germany
Charged pions and protons can be identified in the modularized photon
spectrometer TAPSif one restricts the analysis to isolated BaF2
crystals in the hit response and if one correlates time–of–flight and deposited
energy. This method is exploited in 40 Ar+ nat Ca at 0.8A GeV to
investigate the production of ∆(1232) resonances in the rapidity range
0.2

Nuclear Physics Tuesday
HK 21.5 Tue 18:15 F
Recent Developments at the S–DALINAC ⋆ — •U. Laier 1 ,
W. Beinhauer 1 , M. Brunken 1 , M. Gopych 1 , H.-D. Gräf 1 , T.
Hartmann 1 , M. Hertling 1 , S . Kostial 1 , A. Krassilnikov 2 , A.
Lenhardt 1 , P. Michel 3 , M. Platz 1 , A. Richter 1 , G. Schrieder 1 ,
B. Schweizer 1 , A. Stascheck 1 , O. Titze 1 , S . Watzlawik 1 , T.
Weiland 2 ,andH. Weise 4 — 1 Inst. für Kernphysik, TU Darmstadt
— 2 Fachgebiet TEMF, TU Darmstadt — 3 FZ Rossendorf — 4 TESLA
collaboration, DESY Hamburg
We report on new developments and studies at the S–DALINAC. Results
of measurements performed at the superconducting cavities which
revealed the emission of light in conjunction with field emission are presented.
The former concept of a fully digital RF control system was
changed to a hybrid system consisting of a fast analog feedback circuit
and a DSP-based unit. A fast computer code (V-code) using the model
of ensembles to describe the beam properties was implemented to study
injector beam dynamics. Diagnostics for transverse beam properties using
tomographic techniques have been developed and tested. Compton
diodes developed for the bremsstrahlung diagnosis at the S–DALINAC
were also used for special measurements at TTFL and at ELBE. A new
high energy bremsstrahlung facility was set up to measure the polarizability
of the nucleon by Compton scattering and the 169 ◦ -magic-angle
spectrometer was equipped with silicon microstrip detectors for resolu-
HK22 Plenary Session
tion improvement.
⋆ Supported by the DFG (FOR 272/2-1 and GRK 410/2)
HK 21.6 Tue 18:30 F
An Electrostatic Storage Ring at IAP — •Carsten Welsch 1 ,
Alwin Schempp 1 ,andHorst Schmidt-Boecking 2 — 1 IAP, Goethe
University, Robert-Mayer Strasse 2-4, D-60054 Frankfurt / Main —
2 IKF, Goethe University, August-Euler-Strasse 6, 60486 Frankfurt /
Main
An electrostatic storage ring may be seen as a cross between an electromagnetic
trap and ’classical’ rings. Low costs, small size combined
with mass independence of the necessary fields and good accessibility of
the experimental sections are some of its interesting properties. Possible
experiments with such a machine cover a wide range: Especially the
advantage of being able to store heavy biomolecules and the absence of
magnetic fields makes experiments possible one cannot cover with magnetic
rings.
At IAP design studies have been made for a ring to store particles of
energies up to 50 keV and a quarter ring section is presently being build
up. The necessary optical elements are presented here as well as diagnostic
elements and the control system. An overview of the beam dynamics
calculation shows the high flexibility of the circulating beam and gives
an idea of possible experiments.
Time: Wednesday 08:30–10:00 Room: Plenarsaal
Plenary Talk HK 22.1 Wed 08:30 Plenarsaal
Investigation of K + -meson production in pp and pA collisions
with ANKE — •M. Büscher for the ANKE collaboration — Institut
für Kernphysik, Forschungszentrum Jülich, 52425 Jülich
ANKE is a magnetic spectrometer located at an internal target position
in one of the straight sections of COSY-Jülich. In a first series of measurements
with ANKE, the production of K + -mesons in pA (A =C,Cu,Ag,
Au) collisions in a wide range of beam energies, T =1.0 ...2.3GeV, has
been investigated. The main experimental challenge is that far below the
free NN threshold (TNN =1.58 GeV) the cross section for K + -production
is extremely small, e.g. σtot = 39 nb for pC collisions at 1.0GeV.
For the first time, the complete momentum spectrum of kaons produced
at angles ϑ

Nuclear Physics Wednesday
Group Report HK 23.2 Wed 11:15 A
Renormalization Group Flow in large Nc and beyond — •Kai
Schwenzer for the Rhone-Neckar-Flow collaboration — Institut fuer
Theoretische Physik, Universitaet Heidelberg, Philosophenweg 19, 69120
Heidelberg
We calculate renormalization group flow equations for the bosonized
Nambu–Jona-Lasinio model in large Nc approximation. The flow equations
decouple and can be solved analytically. The solution is equal to
a self consistent solution of the NJL model in the same approximation,
which shows that flow equations are a promising method to solve the
NJL model. Including explicit chiral symmetry breaking, the large Nc
approximation describes physics reasonably well. We further compare
the analytic solution to the usually used polynomial truncation and find
consistency. Further we also discuss the inclusion of meson loops by an
extension to higher orders in 1/Nc.
HK 23.3 Wed 11:45 A
Renormalization in Self-Consistent Approximation schemes at
Finite Temperature — •Hendrik van Hees 1 and Jörn Knoll 2 —
1 Fakultät für Physik, Universität Bielefeld, Universitätsstraße, D-33615
Bielefeld — 2 GSI Darmstadt, Theorie, Planckstraße 1, D-64291 Darmstadt
Within finite temperature field theory, we show that self-consistent
Dyson resummation schemes can be renormalized with all counter terms
defined at the vacuum level (1) provided that the underlying theory is
renormalizable and that the self-consistent scheme follows Baym’s Φderivable
concept. The scheme generates the renormalized self-consistent
equations of motion and the same time the corresponding generating
functional and the thermodynamical potential in consistency with the
equations of motion. This guarantees the standard Φ-derivable properties
like thermodynamic consistency and exact conservation laws also for
the renormalized approximation schemes to hold. First numerical applications
for the φ 4 -theory including the tadpole and the sunset self-energy
diagram are presented in order to show the practicability of the scheme
(2). The question of symmetry violations of such schemes and the concepts
to recover the symmerties (like Goldstone modes) are discussed
(3).
(1) H. van Hees and J. Knoll, Phys. Rev. D, Dec 15 2001; hepph/0107200
(2) H. van Hees and J. Knoll, Phys. Rev. D, submitted; hep-ph/0111193
(3) H. van Hees and J. Knoll, to be submitted to Phys. Rev. D.
HK 23.4 Wed 12:00 A
Evaluation of QCD sum rules for light vector mesons at finite
density and temperature — •Sven Zschocke 1 , Burkhard
Kaempfer 1 ,andOleg Pavlenko 2 — 1 Research Center Rossendorf
e.V., PF 510119, 01314 Dresden, Germany — 2 Institute for Theoretical
Physics, 252143 Kiev-143, Ukraine
The Borel QCD sum rules are evaluated at finite nucleon densities
and temperatures to determine the in–medium behaviour of the lightest
vector mesons ρ, ω and φ. The influence of the poorly known four–
quark condensate is considered. The ρ meson mass drops with increasing
density quite independent of the temperature, while the ω meson experi-
HK24 Nuclear Physics / Spectroscopy III
ences a positive or negative mass shift depending on the parametrization
of the four–quark condensate. On the contrary, the φ meson in–medium
behaviour is mainly determined by the chiral condensate of the strange
quarks and depends on the hidden strangness fraction in the nucleon.
The investigations address a density and temperature region relevant for
the starting experiments of HADES.
HK 23.5 Wed 12:15 A
Chiral Dynamics of the η ′ — •Niklas Beisert, Bugra Borasoy,
and Stefan Wetzel — Physik-Department, Technische Universität
München
We investigate chiral dynamics of the η ′ at low energies based on a
U(3) chiral Lagrangian.
As a first example, the dominant hadronic decay mode of the η ′ ,
η ′ → ηππ, is evaluated up to one-loop order. For the evaluation of loop
integrals we employ infrared regularization which makes 1/Nc counting
rules redundant. Reasonable agreement with data is obtained without
finetuning any parameters.
In the second part of the report, the spectrum of scalar resonances
is analysed by non-pertubative means. The chiral effective Lagrangian
is combined with a coupled-channel Bethe-Salpeter approach which generates
bound state poles of two pseudoscalar mesons. By taking the
next-to-leading order Lagrangian into account we observe a number of
resonances, including exotics, around 1.5 GeV, some of which can be
identified with resonances found in nature.
Work supported in part by the DFG.
HK 23.6 Wed 12:30 A
The case for a large polarized antiquark flavor asymmetry
∆ū(x) − ∆ ¯ d(x) — R.J. Fries 1 , K. Goeke 2 , M. Polyakov 2 , A.
Schäfer 1 ,and•C. Weiss 1 — 1 Institut für Theoretische Physik, Universität
Regensburg, D–93053 Regensburg, Germany — 2 Institut für
Theoretische Physik II, Ruhr–Universität Bochum, D–44780 Bochum,
Germany
The flavor asymmetry of the polarized antiquark distributions in the
proton, ∆ū(x) − ∆ ¯ d(x), is measured in semi-inclusive DISat HER-
MESand in future polarized Drell–Yan / W ± production experiments at
RHIC. Standard explanations for the origin of the antiquark flavor asymmetries
are i) the Pauli blocking effect in a constituent quark picture of
the nucleon, or ii) “meson cloud” contributions to the DISprocess. Estimates
of ∆ū(x) − ∆ ¯ d(x) from rho meson contributions have resulted in
very small values [1]. We show that a sizable polarized flavor asymmetry
is obtained in the meson cloud picture from the interference of πN and
σN contributions to the DISprocess [2]. The value of ∆ū(x) − ∆ ¯ d(x)
expected from this effect is compatible with the Pauli blocking model of
Glück and Reya [3], as well as with the prediction of the chiral quark–
soliton model based on the Nc →∞limit of QCD [4]. We comment on
the experimental consequences of a large polarized flavor asymmetry.
[1] R.J. Fries and A. Schäfer, Phys. Lett. B 443, 40 (1998)
[2]B.Dressler,K.Goeke,M.V.PolyakovandC.Weiss,Eur.Phys.J.C
14, 147 (2000)
[3]M.Glück and E. Reya, Mod. Phys. Lett. A 15, 883 (2000)
[4] D.I. Diakonov et al. Nucl. Phys. B 480, 341 (1996)
Time: Wednesday 10:45–12:45 Room: B
Group Report HK 24.1 Wed 10:45 B
Cluster Knockout from Halo Nuclei — •L.V. Chulkov for the
S174 collaboration — Gesellschaft für Schwerionenforschung, D-64291
Darmstadt, Germany — Russian Research Centre “Kurchatov Institute”,
R-123182 Moscow, Russia
Quasi-elastic scattering of a proton on a cluster inside the halo nuclei
6 He and 8 He has been studied at relativistic energies. The purpose of the
experiment is to determine the spectroscopic factor of the α-cluster in
6 He and in 8 He and the relative contribution of the 6 He ∗ +2n configuration
in the 8 He wave function. These quantities are of vital importance
for understanding the structure of halo nuclei. Additionally, the 4 He projectile
was used as a bench mark nucleus to illustrate the kinematics of
different reaction mechanisms.
The experimental setup consisted of a 600 mg/cm 2 liquid hydrogen
target, a forward spectrometer for tracking and identifying the projectile
fragments and position sensitive detectors for the detection of the recoil
protons. The direction of the fragment has been measured together
with the momentum vector of the recoil proton. The processes of valence
neutron or α-cluster knockout dominate the reaction mechanism.
These processes are well separated by the reaction kinematics through
the correlations in azimuthal and polar angles of the detected particles.
The combination of the relativistic energy beams with the comprehensive
kinematical analysis provides a direct method to determine the
structure of exotic nuclei. The experiment has no analogy with any
other radioactive beam experiments and the experimental data obtained
are unique.

Nuclear Physics Wednesday
Group Report HK 24.2 Wed 11:15 B
Search for the Spin-Dipole Resonance in 12 B — •M.A. de Huu 1 ,
A.M. van den Berg 1 , N. Blasi 2 , M. Hagemann 3 , M.N. Harakeh 1 ,
J. Heyse 3 , M. Hunyadi 1 , R. de Leo 4 , S. Micheletti 2 , H. Okamura
5 , and H.J. Wörtche 1 for the EuroSuperNova collaboration
— 1 Kernfysisch Versneller Instituut, Groningen, The Netherlands —
2 INFN, Milano, Italy — 3 Vakgroep Subatomaire en Stralingsfysica, Universiteit
Gent, Belgium — 4 INFN, Bari, Italy — 5 Saitama University,
Saitama, Japan
We report on an experiment performed at KVI to search for the spindipole
resonance in 12 B and to decompose it into its three different spin
components (J π =0 − ,1 − ,and2 − )byusingthe( � d, 2 He + n) reaction on
12 C. To populate states in 12 B, we used a purely tensor-polarized deuteron
beam at Ed = 170 MeV extracted from the AGOR-cyclotron. The two
outgoing protons of the unbound 2 He nucleus from the 12 C(d, 2 He) reaction
were measured with the Big-Bite Spectrometer and the EuroSuperNova
focal-plane detection system. In coincidence, neutrons emitted
from unbound states in 12 B were detected with the EDEN detector using
a time-of-flight technique for the energy determination of the neutrons.
Both the data obtained for the tensor analyzing power and the angular
correlations for the neutron-decay channels will be used to disentangle
the contributions of the different spin-dipole states. Preliminary results
of the analysis will be shown.
HK 24.3 Wed 11:45 B
Observation of microwave-induced transitions between hyperfine
levels of antiprotonic helium — •Eberhard Widmann —
Department of Physics, University of Tokyo
The ASACUSA collaboration at the Antiproton Decelerator of CERN
succeeded in the year 2001 for the first time to observe two microwaveinduced
transitions between hyperfine levels of antiprotonic helium. The
hyperfine levels are those of a highly excited state (principal quantum
nunber 37, angular quantum number 35) of the exotic three-body system
¯p–e − –He 2+ . The observed transitions at ∼ 12.91 GHz correspond
to an electron spin flip in the orbital magnetic field of the antiproton.
The experimental accuracy is ∼ 1.5×10 −5 , and the measured frequencies
agree with three-body QED calculations on the level a few 10 −5 . The
current precision of the theory is limited by the omission of terms of order
α 2 ≈ 5 × 10 −5 which is worse than the experimental resolution.
This constitutes the first precise measnurement of the orbital magnetic
moment of a composite particle. In addition to providing a benchmark
for three-body QED calculations, the hyperfine structure of antiprotonic
helium is sensitive to the magnetic moment of the antiproton, an important
quantity related to CPT invariance. An increased accuracy of both
experiment and theory may yield an improved value of the antiproton
magnetic moment which is only known with an accuracy of 3 × 10 −3 .
HK 24.4 Wed 12:00 B
Gamow-Teller matrix elements from the (d, 2 He) reaction at
170 MeV — •S .Rakers, C. Bäumer, D. Frekers, E. Grewe,
B. Junk, andR. Schmidt for the EUROSUPERNOVA collaboration
— Institut für Kernphysik, Westfälische Wilhelms-Universität Münster,
Wilhelm-Klemm-Str. 9, D-48149 Münster
The (d, 2 He) reaction, where 2 He denotes the unbound system of two
protons being in a 1 S0 state, is a charge-exchange reaction of (�n,�p) type.
HK25 Nuclear and Particle Astrophysics III
At extreme forward angles, the probe excites Gamow-Teller states with
high purity.
We have performed (d, 2 He) experiments on the N=Z nuclei 12 Cand
24 Mg at Ed=170 MeV. The protons from the 2 He decay were detected
in coincidence with the BBS-ESN spectrometer/detector setup at the
AGOR cyclotron in Groningen. Energy resolutions of 145 keV were
achieved, allowing a detailed spectroscopy of the final nuclei 12 Band
24 Na.
In the talk, we will present spectra, angular distributions, and DWBA
calculations. In the case of the 24 Mg, the 0 ◦ spectrum is compared with
(p,n) reaction data in which the same levels in the analog nucleus 24 Al are
populated. A detailed one-to-one correspondence is observed. Spectra
canalsobecomparedwith(p,p ′ ) data, yielding a complete level scheme
for 1 + states in the A=24 (T=1) isospin triplet.
HK 24.5 Wed 12:15 B
Exclusive measurement of breakup reactions with the oneneutron
halo nucleus 11 Be — •R. Palit for the LAND collaboration
— Institut für Kernphysik, Johann Wolfgang Goethe Universität,D-
60486 Frankfurt, Germany
One-neutron removal reactions of 520 MeV/u 11 Be projectiles impinging
on carbon and lead targets were studied in a kinematically complete
experiment using the LAND set-up at GSI. The 10 Be fragments, neutrons,
as well as gamma-rays from the excited states of the fragment
were detected in coincidence and the partial cross sections populating
the ground and excited states of the core nucleus were deduced. The
relative energy spectrum between the 10 Be core and a neutron in the
continuum was derived, yielding the spectroscopic factor for the neutron
in the 2s halo state. The comparison of electromagnetic and nuclear
contributions to the breakup will be presented. It has been found that
Coulomb breakup predominantly populates the core ground state, while
excited states account for only a few percent of the total cross section.
Model calculations interconnecting the structure of 11 Be and the experimental
cross sections will be presented.
Supported by BMBF (06OF112, 06MZ864) and by GSI (OF ELZ, MZ KRK).
HK 24.6 Wed 12:30 B
Systematic study of the structure of neutron rich oxygen isotopes
— •Kate Jones for the LAND/S188/S233 collaboration —
Gesellschaft für Schwerionenforschung (GSI), Planckstr. 1, D-64291
Darmstadt, Germany
The one neutron removal from isotopes of oxygen with A = 17 to
23 has been studied in complete kinematics using the LAND/ALADIN
setup at GSI at energies around 500 MeV/A. The radioactive beams
were produced via fragmentation using the fragment separator, FRS.
Targets of carbon and lead have been used to study the nuclear knockout
and Coulomb dissociation respectively. The charged (A-1) fragments
and neutrons were detected in coincidence with the gamma-rays emitted
from excited states of the residual nucleus. The single particle structure
of the projectile can be deduced from the low-lying E1 strength using a
direct break up model. Detailed structural information of the odd-mass
oxygen isotopes, including the halo nucleus candidate 23 O, has been derived
from Coulomb dissociation.
Supported by BMBF (06OF112, 06MZ864) and by GSI (OF ELZ, MZ KRK).
Time: Wednesday 10:45–12:15 Room: C
Group Report HK 25.1 Wed 10:45 C
Astrophysical S factor for 7 Be(p,γ) 8 B from precision cross section
measurements — •A.R. Junghans 1 , E.C. Mohrmann 1 , K.A.
Snover 1 , T.D. Steiger 1 , E.G. Adelberger 1 , J.M. Casandjian 1 ,
H.E. Swanson 1 , L. Buchmann 2 , S.H. Park 2 ,andA. Zyuzin 2 —
1 CENPA, University of Washington, Seattle WA, U.S.A. — 2 TRIUMF,
Vancouver B.C., Canada
Super-K and SNO are sensitive mainly to neutrinos from the decay of
8 B produced by the 7 Be(p,γ) 8 B reaction in the Sun. An improved determination
of this cross section (Sfactor) at solar energies is necessary
at the level of ±5% in order that this reaction rate not be the dominant
uncertainty in the νe flux predicted by solar model calculations 1 . We
have made new, direct measurements of the 7 Be(p,γ) 8 B cross section at
27 points from Ecm = 0.18 to 1.2 MeV using the van de Graaff accelerator
of the University of Washington with a Terminal Ion Source, and a
106 mCi 7 Be target produced at TRIUMF and deposited on a Mo backing.
The water-cooled target, mounted on the end of a rotating arm,
is irradiated in the proton beam and then rotated 180 degrees in front
of a Si-detector where the α particles following the β decay of 8 Bare
counted. Our technique involves a number of improvements over previous
measurements. In our measurements, we have achieved a precision
±5% or better per point. Results will be presented and compared with
model calculations and with other experiments. 1 J. Bahcall et al. Phys.
Lett. B433 (1998) 1

Nuclear Physics Wednesday
HK 25.2 Wed 11:15 C
The 18 O(α, γ) rate during stellar He burning — •Sa’ed Dababneh
1 , Joachim Görres 2 , Michael Heil 1 , Franz Käppeler 1 , Rene
Reifarth 1 , and Michael Wiescher 2 — 1 Forschungszentrum Karlsruhe,
Institut für Kernphysik, 76021 Karlsruhe — 2 University of Notre
Dame, Department of Physics, Notre Dame, IN 46556, USA
The 22 Ne(α,n) reaction is the dominant neutron source for the weak
s process in massive stars and plays also a significant role in s-process
nucleosynthesis in thermally pulsing AGB stars. 22 Ne is produced by the
reaction sequence 14 N(α, γ) 18 F(β + ) 18 O(α, γ) 22 Ne. While the first reaction
is well understood, α-capture on 18 O is still affected by considerable
uncertainties. At the temperatures of interest the reaction rate is dominated
by two resonances at α-energies of 470 keV and 566 keV. Since
these resonances were not yet observed directly, the rates had to be based
on estimated resonance strengths. We have searched for these resonances
using an intense α-beam and a Ge-clover detector in combination with
BGO detectors. First results of this experiment will be reported, and the
implications for stellar neutron production will be discussed.
HK 25.3 Wed 11:30 C
Study of the 14N(p,γ) 15O reaction at low energies — •Frank
Strieder for the LUNA collaboration — Institut für Physik mit Ionenstrahlen,
Ruhr-Universität Bochum, Germany
The 14N(p,γ) 15O capture reaction is a crucial reaction in stellar models,
being the limiting reaction in the CNO cycle. Therefore, this reaction
controlls not only the energy generation in the CNO cycle but also influences
the determination of the age of globular clusters in our galaxy.
The cross section of the 14N(p,γ) 15O reaction has already been measured
by different groups but large uncertainties remain in the absolute value
of the astrophysical Sfactor. By using the new 400 kV LUNA accelerator
at the Gran Sasso underground laboratory (LNGS) the cross section
of this reaction will be studied complementary with a solid and a gas
target to energies far below the 278 keV resonance. The solid target
set-up consists of targets produced by plasma deposition techniques and
several large volume HPGe detectors taking advantage of the very low
γ-ray background at LNGS. The gas target set-up is based on a large
BGO summing crystal and a windowless gas target system with the target
chamber placed inside the detector central hole. A progress report
on the details of the experiments and the first results will be given in this
talk.
HK 25.4 Wed 11:45 C
Alpha decay of low-lying states in 19Ne: studies toward a determination
of the 15O(α,γ) 19Ne reaction rate in novae and Xray
bursts — •B. Davids1 , R. Siemssen1 , A. M. van den Berg1 ,
F. Fleurot1 , M. Hunyadi1 , M. de Huu1 , R. E. Segel2 , H. W.
Wilschut1 ,andH. J. Wörtche1 — 1Kernfysisch Versneller Instituut,
Zernikelaan 25, 9747 AA Groningen, the Netherlands — 2Department of
Physics and Astronomy, Northwestern University, 2145 Sheridan Road,
Evanston, Illinois 60208 USA
The rate of the 15 O(α,γ) 19 Ne reaction strongly influences breakout
from the hot CNO cycles into the rp process in novae and X-ray bursts.
As a direct measurement of the cross section for this reaction is not yet
feasible, measurements of the reduced alpha widths of low-lying states
in 19 Ne using transfer reactions with stable beams offer the most reliable
information on the resonant reaction rate. At the KVI, we have carried
out a preliminary measurement of this kind using the highly selective
p( 21 Ne,t) 19 Ne reaction. The principles of this technique and initial results
will be presented.
HK 25.5 Wed 12:00 C
Determination of S�1 and S�2 for 12 C(α,γ) 16 O from Gamma
Angular Distribution Measurements — •Michael Fey 1 , J.W.
Hammer 1 , D. Malcherek 1 , R. Kunz 1 , A. Lefèbvre 2 , J. Kiener 2 ,
V. Tatischeff 2 , M. Assunção 2 , A. Coc 2 , C. Grama 2 , F. Hammache
2 , F. Hannachi 2 , A. Korichi 2 , A. Lopez-Martens 2 , J.P.
Thibaud 2 , F. Haas 3 , C. Beck 3 , S.Courtin 3 , M. Rousseau 3 , N.
Rowley 3 , S . S zilner 3 , S. Harissopulos 4 , E. Galanopoulos 4 ,
G. Kriembardis 4 , T. Paradellis 4 , G. Staudt 5 , J. Weil 6 , and
F. Fleurot 7 — 1 Institut für Strahlenphysik, Universität Stuttgart,
Germany — 2 CSNSM, Orsay, France — 3 IRes, Strasbourg, France —
4 N.C.S.R. “Demokritos”, Athens, Greece — 5 Physikalisches Institut,
Universität Tübingen, Germany — 6 University of Kentucky, Lexington,
USA — 7 KVI, University of Groningen, Netherlands
Several Experiments on 12 C(α,γ) 16 O have been performed at the
4MV Dynamitron accelerator in Stuttgart with arrays of high efficient
HPGe(BGO)-detectors to obtain γ angular distributions in a wide energy
range. From these the E1 andE2 cross sections can be separated, which
are required to describe the complex capture mechanism of this reaction
with several interfering states and the non-resonant capture. From an
R-matrix analysis one obtains an appropriate model description of this
reaction and the extrapolation into the stellar energy range of stellar
burning temperatures. The status of the experiments and several results
will be presented and discussed.
HK26 Electromagnetic and Hadronic Probes III
Time: Wednesday 10:45–12:45 Room: D
Group Report HK 26.1 Wed 10:45 D
Electromagnetic structure of the nucleon investigated by free
and quasi-free Compton scattering — •Martin Schumacher,
Karsten Kossert, Marcus Camen und Frank Wissmann für
die A2-Kollaboration — Zweites Physikalisches Institut der Universität,
Bunsenstraße 7–9, D-37073 Göttingen
The electromagnetic structure of the nucleon may be parameterized
through amplitudes for one pion photoproduction or through invariant
amplitudes for Compton scattering. In addition structure constants are
used having a straightforward physical interpretation. These structure
constants are the E2/M1 ratio of the p → ∆ transition, the electromagnetic
polarizabilities α and β and the spin polarizabilities γ0 and
γπ. Recently, these structure constants have been measured at MAMI
(Mainz) by Compton scattering at the free proton and the proton and
neutron bound in the deuteron using different experimental setups. It is
reported about the experiments and about new results for the backward
spin polarizability γπ and the electromagnetic polarizabilities α and β for
the proton and the neutron.
Group Report HK 26.2 Wed 11:15 D
The COMPASS Experiment at CERN — •F.H. Heinsius for the
COMPASS collaboration — Universität Bonn — Universität Freiburg
The COMPASS experiment at CERN investigates the hadron structure
by deep inealistic muon scattering and hadronic production processes.
The main goal of the experiment is to measure the gluon contribution
to the nucleon spin via open charm production and hadron pairs with
high transverse momentum. A major part of the experiment has been installed
in 2001 and first data taking has started. Highlights of the physics
programme as well as the status of the experiment will be presented.
The project is supported by BMBF.
HK 26.3 Wed 11:45 D
Simulations for the Measurement of the Polarizabilities of the
Pion at COMPASS* — •Roland Kuhn, Jan Friedrich, Stephan
Paul, and Lars Schmitt for the COMPASS collaboration — TU
München, Physik-Department E18, James-Franck-Straße, 85747 Garching,
Germany
A Monte Carlo simulation of the Primakoff Compton scattering pro-

Nuclear Physics Wednesday
cess π − N → π − γN is presented which demonstrates the feasibility of the
measurement of the pion polarizabilities α and β with the COMPASS
spectrometer at the CERN SPS. Data samples with a total of 2.9 million
events, corresponding to three days of COMPASS data taking, were
generated using the Polaris event generator and have been analyzed to
study event selection algorithms and reconstruction efficiency. For the
hadronic background 4.5 million events have been simulated using the
Fritiof event generator. The results of this study and the accuracy which
can be achieved will be presented. *This project is supported by the
BMBF and the Maier-Leibnitz-Labor, Garching
HK 26.4 Wed 12:00 D
Near-threshold π 0 production from the neutron in d(γ,π 0 n)p —
•D.L. Hornidge for the A2 collaboration — University of Saskatshewan,
Saskatoon, Canada — Johannes Gutenberg–Universität, Mainz
A significant body of experimental results now exists for the proton
photo-pion amplitudes near threshold and is in good agreement with
ChPT predictions. Due to the experimental intricacies involved, there is
a clear lack of data in the threshold region for the neutron. Preliminary
attempts to determine the neutron amplitudes using the coherent production
from the deuteron were hampered by the difficulties in separating
out nuclear effects. For these reasons, a measurement of π 0 photoproduction
in the threshold region from the neutron via the d(γ,π 0 n)p reaction
channel has been performed using the Mainz Microtron (MAMI). Photons
in the energy range Eγ = 95.7 − 208.5 MeV were tagged using
the Glasgow tagger, the TAPSspectrometer was employed to detect the
neutral-pion decay photons, and a segmented liquid-scintillator detector
covering the angular range θn =21.5 ◦ ± 8.5 ◦ , φn =0.0 ◦ ± 8.5 ◦ was
used to detect recoil neutrons under quasi-free kinematical conditions.
Preliminary results will be presented.
HK 26.5 Wed 12:15 D
Pion production in p + d reactions in the resonance region
— H. Machner and •H. Machner for the GEM collaboration and
the GEM collaboration — Institut für Kernphysik, Forschungszentrum
Jülich, Jülich, Germany
Pion production is the first inelastic channel in pp interactions. The
pd → 3 Heπ 0 and pd → 3 Hπ + reactions are the key reactions for the
understanding of meson production on nuclei. We have measured com-
HK27 Heavy Ions III
plete angular distributions and total cross sections for both reactions in
the region of the ∆(1232) resonance for seven different beam momenta.
No data existed for the first reaction in this range, while previous data
for the second reaction were sometimes in disagreement. The recoiling
trinucleons were detected with the GEM detector (Ref. 1). The data
show two two components: one for small momentum transfer and the
second one for large momentum transfer. While the first one can be reproduced
by model calculations the models fail to account for the second
component. The possible reaction mechanisms will be discussed.
[1] M. Betigeri et al., Nuclear Instr. Methods in Physics Research A 421
(1999) 447
HK 26.6 Wed 12:30 D
First results from the new pionic hydrogen experiment —
•M. Hennebach1 , D. F. Anagnostopoulos2 , W. Breunlich3 , H.
Fuhrmann3 , D. Gotta1 , A. Gruber3 , P. Indelicato4 , Y.-W. Liu5 ,
B. Manil4 , V. Markushin5 , N. Nelms6 , A. J. Rusi El Hassani7 ,
L. M. Simons5 ,andH. Zmeskal3 — 1IKP, FZ Jülich — 2Dept. of
Mat. Science, Univ. of Ioannina — 3IMEP, Österr. Akademie der Wiss.,
Wien — 4 Lab. Kastler-Brossel, UPMC Paris — 5 PSI, Villigen — 6 Univ.
of Leicester — 7 Dept. de Phys., Tanger, Morocco
A new high–precision measurement of the strong–interaction shift (ɛ1s)
and broadening (Γ1s) of the ground state in pionic hydrogen (πH) has
been started at PSI. This experiment constitutes a direct measurement
of the πN scattering lengths and is an important test of the methods of
chiral perturbation theory (χPT).
Pions from the πE5 beam at PSI are slowed down into a cryogenic gas
target installed inside the cyclotron trap to form pionic atoms. Resultant
x–rays are reflected onto a large area CCD array by a Bragg spectrometer.
ɛ1s is derived by comparing the measured energy with a pure QED
calculation; Γ1s is obtained after deconvolution of the crystal response
function. Collision processes during the cascade of the pion through the
atomic levels could skew the measured values - molecular formations of
the form [(π − pp)p]ee could shift the measured energy, and Coulomb deexcitation
will increase the width of the line. The possible influence of these
collision processes is investigated by varying the target density. During
the first production run, conducted in spring 2001, measurements ranged
from 3 bar to liquid hydrogen (eqv. pressure ∼700 bar).
Time: Wednesday 10:45–12:45 Room: E
Group Report HK 27.1 Wed 10:45 E
Particle flow at RHIC — •Christian Fuchs, Amand Faessler,
Eugene Zabrodin, andLarissa Bravina — Institut für Theoretische
Physik, Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen,
Germany
We investigate directed (v1) and elliptic flow (v2) of hadrons in heavy
ion collisions at RHIC energies, i.e. at √ s = 130 and 200 AGeV. The
microscopic quark-gluon string model (QGSM) is used. Available data
on the elliptic flow from the STAR Collaboration [1] are well described
by this approach, in particular the pt dependence of v2 is reproduced also
at high pt where hydrodynamical models usually fail [2]. The origin of
the elliptic flow within the QGSM model is discussed and predictions for
v1 are given. The success of the QGSM model for the description of the
elliptic flow is thereby due to the variety of string excitations included
in that model. We further present predictions for the flow of negatively
and positively charged kaons at SPS and RHIC. Here the change in the
flow pattern reflects in a clear way the transition from baryon to meson
dominated matter when going from SPS to RHIC energies.
[1] K.H. Ackermann et al., STAR Collab., Phys. Rev. Lett. 86 (2001)
402
[2] E. Zabrodin, C. Fuchs, L. Bravina, A. Faessler, Phys. Lett. B508
(2001) 184
Group Report HK 27.2 Wed 11:15 E
Charmonium Evolution in a Hot and Dense Environment —
•Alberto Polleri 1 , Thorsten Renk 1 , Roland A. Schneider 1 ,
and Wolfram Weise 1,2 — 1 Physik Department, TU München, D-
85747 Garching,Germany — 2 ECT*, I-38050 Villazzano (TN), Italy
It has been suggested long ago that the measurement of the J/ψ production
cross section in ultra-relativistic nuclear collisions can provide
an important signal of quark-gluon deconfinement. Intense theoretical
work has been performed in order to understand the production process
in proton-nucleus collisions. This piece of information is used to provide
a baseline to the study of the subsequent evolution of J/ψ and,
more generally, of charmonia, in the hot and dense medium produced in
more complex high-energy nucleus-nucleus collisions. With this input,
we study the subsequent interactions of charmonia as they collide with
the constituents of the produced fireball. The latter evolves in a manner
controlled by the equation of state as given by lattice QCD, and is constructed
in such a way that the observed hadronic spectra are correctly
reproduced. A kinetic description of charmonium interactions with both
quark-gluon and hadronic degrees of freedom allows to study in microscopic
detail the evolution in different regimes, controlled by collision
energy, kinematics (rapidity and pT ) and geometry (centrality). While
the amount of data collected at the CERN-SPS accelerator is well described,
new predictions for the presently running BNL-RHIC machine
are presented.
[*] Work supported in part by BMBF and GSI.
Group Report HK 27.3 Wed 11:45 E
Chemical Freeze-out of Antihyperons in Relativistic Heavy Ion
Collisions — •Carsten Greiner — Institut fuer Theoretische Physik,
Universitaet Giessen
We elaborate on our recent suggestion on antihyperon production in
relativistic heavy ion collisions solely by means of multi-mesonic (fusiontype)
reactions. It will be shown that the antihyperons are driven towards
chemical equilibrium with pions, nucleons and kaons on a timescale of
1–3 fm/c in a still moderately baryon-dense hadronic environment. Explicit
rate calculations for a dynamical setup will be presented and detail
the proposed picture. For an estimated entropy to baryon ratio of

Nuclear Physics Wednesday
S/A ≈ 30 − 40 at maximum SPS energies yields of each antihyperon
specie are obtained which are consistent with chemical saturated populations
of T ≈ 150 − 160 MeV. The proposed picture thus supports
dynamically the chemical freeze-out for the antibaryons at such a temperature.
The production process should also dominate at AGSenergies
or at energies of possible future heavy ion facilities at GSI.
HK 27.4 Wed 12:15 E
Dilepton radiation from a fireball — •Thorsten Renk 1 , Roland
A. Schneider 1 ,andWolfram Weise 1,2 — 1 Technische Universität
München — 2 ECT ∗ ,Trento
Dileptons are important probes in the context of heavy ion collisions,
as they do not thermalize but rather escape at all stages of the fireball
evolution, therefore providing a window to the early conditions where the
quark-gluon plasma (QGP) presumably exists. Using a thermodynamically
self-consistent model for the fireball created in a heavy ion collision,
we calculate the emission of dilepton radiation during the fireball evolution
and compare to SPS 40 and 160 AGeV data. For the QGP phase of
the evolution, we use a quasiparticle model to obtain the thermal spectral
function which determines the dilepton rate. In the hadronic phase,
the spectral function is calculated using an improved vector meson dominance
model combined with chiral dynamics. We find good agreement
HK28 Instrumentation and Applications III
to the data. Predictions for the PHENIX experiment at RHIC are also
given.
Work supported in part by BMBF and GSI.
HK 27.5 Wed 12:30 E
Diffusion in relativistic systems — •Georg Wolschin — 69120
Heidelberg
Phase-transition scenarios to a quark-gluon phase are based on the assumption
that at least a substantial part of the system thermalizes. In
this work, the kinetic equilibration in the system of participant baryons
is investigated analytically in the relativistic diffusion model (RDM, [1])
from SIS via AGS to SPS and RHIC energies.
The dissipation-fluctuation theorem (Einstein relation) is fulfilled at
low SIS-energies, whereas progressively larger deviations rising to an order
of magnitude are found at AGS-, SPS- and RHIC-energies. This
effect is investigated as a consequence of the strong-coupling character of
the system. The rapidity diffusion coefficient becomes time-dependent.
Predictions for the 40 A GeV/c SPS, and 2*100 A GeV/c RHIC runs are
made. In spite of the successful application of thermodynamical concepts
to hadron production, the system does not reach thermal equilibrium.
[1] G. Wolschin, Eur. Phys. J. A 5 (1999) 85; Europhys. Lett. 47
(1999) 30.
Time: Wednesday 10:45–12:45 Room: F
Group Report HK 28.1 Wed 10:45 F
The Readout System of the COMPASS Experiment
— •Thomas Schmidt 1 , H. Angerer 2 , A. Danasino 1 , H. Fischer
1 , J. Franz 1 , B. Grube 2 , A. Grünemaier 1 , S. Hedicke 1 ,
F.H. Heinsius 1 , M. von Hodenberg 1 , F. Karstens 1 , W. Kastaun
1 , K. Königsmann 1 , I. Konorov 2 , J. Reymann 1 , H. Schmitt 1 ,
L. Schmitt 2 , and J. Worch 1 for the COMPASS collaboration —
1 Fakultät für Physik, Universität Freiburg — 2 Physik-Department E18,
Technische Universität München
COMPASS is a fixed-target experiment at CERN to investigate the spin
structure of the nucleon, particularly seeking to determine the gluon polarization.
Large data and event-rates made the development of a new
Data Acquisition (DAQ) System necessary. Data are digitized directly
at the detector and transfered to common readout interfaces (CATCH).
These initialize all frontend-boards at the start of the data acquisition,
distribute the clock and trigger-signals of the trigger-control system to
all connected equipments and monitor the trigger and data-flow.
CATCH is realized as a 9U VME-module based on reprogrammable
FPGA chips. For adaptation of different types of detectors the inputs are
designed as exchangeable mezzanine-cards. Data arriving at the CATCH
are sorted and transfered to a networked DAQ system via optical S-Link
at a rate of up to 1.2 Gbit/s in a detector independent format.
In 2001 data of more than 150 000 electronic channels have been
recorded. Functionality and performance of the CATCH and the DAQsystem
during last year’s beam time are presented.
This project is supported by the BMBF.
HK 28.2 Wed 11:15 F
Silicon Microstrip Detectors for the COMPASS Experiment* —
•Robert Wagner, Boris Grube, Rita De Masi, Igor Konorov,
Stephan Paul, andMichael Wiesmann for the COMPASS collaboration
— TU München, Physik-Department E18, James-Franck-Straße,
85747 Garching, Germany
The fixed target experiment COMPASS at the CERN SPS started
taking data in 2001. As part of its tracking system, double-sided silicon
microstrip detectors have been commissioned in the target region of
the experiment. The readout system is based on the APV25 chip and
a low-noise ADC module performing zero suppression. The detector design
and setup is described. While operation at cryogenic temperatures
is planned in 2002, for the 2001 run emphasis was still set on investigating
the detectors’ properties. The system has been operated in the
COMPASS high-intensity muon beam, where the noise performance, the
ADC data reduction algorithms, the time resolution and further detector
parameters could be studied. *This project is supported by the BMBF
and the Maier-Leibnitz-Labor, Garching
HK 28.3 Wed 11:30 F
Beam Loss Monitor for HERMES — •Andreas Reischl, Martin
van Beuzekom, Othmane Bouhali, Sander Mos, andJos Stejiger
for the HERMEScollaboration — NIKHEF POBox 41882, 1009 DB
Amsterdam, The Netherlands
A Beam Loss Monitor (BLM), made of ionization chambers, has been
designed and constructed. It is installed in the HERMESfront region
and will be used as a fast trigger for the HERA lepton-beam dump kicker.
The aim is to protect radiation sensitive detector components like the so
called Lambda Wheels, Recoil Detector and the target cell etc., against
accidental beam losses. A sudden and large increase in the radiation level
near the experiment is a suitable indication of beam inabilities leading to
a loss of beam. The amount of radiation caused by these accidents can
be reduced greatly by kicking the beam out of the machine. The detector
system and the beam dump magnet have to be fast. The detector,
together with a fast electronic trigger and an optical link (about 4km)
which route the trigger signal, serves the kicker magnets, which can be
powered in a sufficiently short time. We report of the design principles,
the calibration done on a X-Ray generator and the first results of tests
done at HERMESin the fall of 2001.
HK 28.4 Wed 11:45 F
A Scintillating Fibre Hodoscope for High Rate Applications at
COMPASS ∗ — •R. Webb 1 , J. Bisplinghoff 2 , D. Eversheim 2 ,
W. Eyrich 1 , R. Joosten 2 , O. Nähle 2 , F. Stinzing 3,1 , A. Teufel
1 , S.Wirth 2,1 und R. Ziegler 1,2 — 1 Physikalisches Institut, Universität
Erlangen-Nürnberg, D-91058 Erlangen — 2 Institut für Strahlenund
Kernphysik, Universität Bonn, D-53115 Bonn — 3 Fakultät für Physik,
Universität Freiburg, D-79104 Freiburg i. Br.
Scintillating fibre detectors are at the present the only technology capable
of tracking at rates of 10 6 particles/s/mm 2 .
Such capability is required for tracking in the central area of the spectrometer
at the COMPASS experiment. Eight detector stations with
19 planes having space resolutions between 0.5 and 1.0 mm have been
realized. Results from the 2001 beam time which show that these fibre
hodoscopes fulfil all expectations in the areas of time resolution and
efficiency will be presented.
∗ supported by BMBF
HK 28.5 Wed 12:00 F
The HERMES Polarized Internal Gas Target — •Mark Henoch
for the HERMEScollaboration collaboration — Physikalisches Institut,
Univ. Erlangen-Nürnberg, 91058 Erlangen
The HERMES experiment (HERa MEasurement of Spin) at DESY
uses the HERA polarized lepton beam in combination with the polarized
internal target technique in order to determine the spin dependent structure
functions of the proton and neutron via deep-inelastic scattering.

Nuclear Physics Wednesday
The HERMEStarget consists of a storage cell internal to the HERA
lepton ring in which hydrogen or deuterium gas is injected from an atomic
polarized source.
A sampled beam is extracted from the center of the storage cell to
analyse the target gas for atomic polarization and atomic fraction using
a Breit-Rabi-Polarimeter and a target gas analyser.
These values can be related to the average values inside the storage
cell using sampling corrections.
The analysis of the average target polarization of the year 2000 with
deuterium gas in a longitudinal magnetic holding field will be presented
as well as preparations and first results of the change to a transversal
holding field using hydrogen gas.
HK 28.6 Wed 12:15 F
The Common GEM and Silicon Readout for the COMPASS Experiment
[ ∗ ]—•Boris Grube 1 , Rita De Masi 1 , Jan Friedrich 1 ,
Igor Konorov 1 , Stephan Paul 1 , Lars Schmitt 1 , Frank Simon 1 ,
Robert Wagner 1 , Michael Wiesmann 1 ,andBernhard Ketzer 2
for the COMPASS collaboration — 1 TU München, Physik-Department
E18, James-Franck-Straße, 85748 Garching, Germany — 2 CERN, CH-
1211 Genève 23, Switzerland
COMPASS is a fixed target experiment at the CERN SPS which uses
GEM and Silicon detectors for small angle tracking. For both detector
types the APV 25, a development of the CMScollaboration, was chosen
as the frontend chip. The system utilizes the ’Multi’ readout mode of the
APV, in which the chip sends three consecutive samples for each event.
By calculating the ratios of the amplitudes of the different samples, it
is possible to determine the position along the assumed pulse shape and
thus to get precise timing information. The readout chain is based on
reconfigurable logic in the form of Field Programmable Gate Arrays
HK29 Theory IV
(FPGAs) and is designed to stand high trigger rates of up to 100 kHz.
The analog signals of the APV are digitized by 10 bit ADCs. The digital
signals are then processed and sparsified by a zero suppression logic. Because
fluctuations of the baseline of the APV are observed, the data have
to be corrected for this ’common mode noise’, before a threshold cut can
be applied. This correction is performed in the hardware using a combination
of averaging and histogramming. [ ∗ ] This project is supported by
the BMBF and the Maier-Leibnitz-Labor, Garching
HK 28.7 Wed 12:30 F
The new TAPS electronics — •Peter Drexler for the TAPS
collaboration — II. Physikalisches Institut, Justus-Liebig-Universität
Giessen
To adapt the photonspectrometer TAPSto the needs of advanced,
state-of-the-art experiments, a completely new readout for 4 channels
per module has been designed to replace and improve the currently used
electronics. The main goal for the new design has been the need for
a better handling, easier maintainance, improved performance and the
capability to cope with higher rates. The readout of a typical TAPS-
BaF2-signal comprises 4 QACs for the separate integration of the long
and short scintillation components in two different dynamic ranges, a
TAC and 2 LEDs for more sophisticated trigger conditions. A CFD is
included to optimize the timing information. A PLD provides the slow
control. These combined analog and digital functions are implemented
on a piggyback residing on a commercial motherboard, developed by
the HADEScollaboration. Therefore, the compatibility allows combined
experiments with the HADESsetup. First results of in-beam test experiments
obtained with the new electronics with regard to energy and time
resolution will be presented.
Time: Wednesday 14:00–15:30 Room: A
Group Report HK 29.1 Wed 14:00 A
Towards the theory of coherent hard dijet production on
hadrons and nuclei — •Vladimir Braun 1 , Dmitry Ivanov 1 ,
Andreas Schäfer 1 , and Lech Szymanowski 2 — 1 Institut für
theoretische Physik, Universität Regensburg, D-93040, Regensburg —
2 CPhT, École Polytechnique, F-91128 Palaiseau, France
We carry out a detailed calculation of the cross section of a pion diffraction
dissociation in two jets with large transverse momenta, originating
from a hard gluon exchange between the pion constituents. Both the
quark and the gluon contribution are considered and in the latter case
we present calculations both in covariant and in axial gauges. We find
that the standard collinear factorization does not hold in this reaction.
The structure of non-factorizable contributions is discussed and the results
are compared with the experimental data. Our conclusion is that
the existing theoretical uncertainties do not allow, for the time being, for
a quantitative extraction of the pion distribution amplitude.
HK 29.2 Wed 14:30 A
Twist-3 generalized parton distributions from instantons —
•Dmitri Kiptily 1 and M.V. Polyakov 1,2 — 1 Institute for Theoretical
Physics II, Ruhr University Bochum, 44780 Bochum, Germany —
2 Petersburg Nuclear Physics Institute, 188350 Gatchina, Russia
The Deeply Virtual Compton Scattering (DVCS) is a two photon scattering
off a hadron considered in the Bjorken limit, when initial photon
has a large virtuality. The leading twist contribution to the DVCSamplitude
expresses through the Generalized Parton Distributions (GPD).
The leading (twist-3) power corrections consist of two parts: the pure
quark “kinematical” contribution expressed through twist-2 GPDs and
the quark-gluon one originated from non-diagonal hadronic matrix elements
of type 〈P ′ |¯qGq|P 〉. The latter is supposed to be small relative to
the “kinematical” one, although there wasn’t suggested any theoretical
justification to this hypothesis.
We discuss the twist-3 quark-gluon effects in the DVCS. We estimate
the non-diagonal hadronic matrix elements in a framework of the model
of the instanton vacuum. It turns out, that the contribution is parametrically
small due to the small packing fraction of the instanton vacuum.
HK 29.3 Wed 14:45 A
Nucleon Spectral Function by Transport Theory — •Jürgen
Lehr, Horst Lenske, Stefan Leupold, andUlrich Mosel —Institut
für Theoretische Physik, Universität Gießen, Germany
We calculate the nucleon spectral function in nuclear matter using the
relation between collision rates and correlation functions known from
quantum transport theory. Contributions to the correlational self energy
of 2p1h and 1p2h structure are considered. For the calculations
we use a constant matrix element. The obtained spectral functions und
momentum distributions are in good agreement with results from manybody
calculations, thus indicating that the hole-type spectral function is
dominated by the average short-range correlation strength. First results
from the implementation of the spectral function into our BUU transport
model are discussed.
Work supported by BMBF and DFG.
HK 29.4 Wed 15:00 A
Nucleon Form Factors in intermediate Momentum Transfer
— •Nils Mahnke 1 , Vladimir Braun 1 , Alexander Lenz 1 , and
Eckart Stein 1,2 — 1 Inst. für theor. Physik, Universität Regensburg,
D-93040 Regensburg, Germany — 2 Physics Department, Maharishi University
of Management, NL-6063 NP Vlodrop, Netherlands
This Talk will present our results for the proton and neutron form factors
in intermediate momentum transfer, based on the systematic study
of higher-twist light-cone distribution amplitudes of the nucleon in QCD.
HK 29.5 Wed 15:15 A
A relativistic point-coupling model in Hartree- and Hartree-
Fock-approximation — •Thomas Bürvenich 1 , T. Cornelius 1 , A.
Sulaksono 1 , S.Schramm 2 , J. A. Maruhn 1 , P.-G. Reinhard 3 , D.
G. Madland 4 ,andW. Greiner 1 — 1 Institut für Theoretische Physik,
Universität Frankfurt am Main — 2 Nuclear Theory Group, Argonne National
Laboratory — 3 Institut für Theoretische Physik II, Universität
Erlangen–Nürnberg — 4 T-16 Division, Los Alamos National Laboratory
Relativistic point-coupling models (RMF-PC) are powerful tools for
typical nuclear structure applications [1] with a quality comparable to
other mean-field approaches like the relativistic mean-field model with

Nuclear Physics Wednesday
meson exchange (RMF-FR) and the Skyrme-Hartree-Fock (SHF) model.
A comparison of the predictions of these models for a variety of observables
makes it possible to study the influence of the different ingredients
of the models on their predictive power. Especially the role of finite range
and relativistic framework can be investigated separately. The structure
of the RMF-PC model allows Hartree-Fock calculations which are hardly
HK30 Nuclear Physics / Spectroscopy IV
more expensive than calculations on the Hartree level. We discuss first
results and show perspectives for the near future. Supported by BMBF,
GSI, DFG.
[1] T. Bürvenich, D. G. Madland, J. A. Maruhn, und P.-G. Reinhard,
nucl-th/0111012 (2001), accepted for publication in Phys. Rev. C
Time: Wednesday 14:00–15:30 Room: B
Group Report HK 30.1 Wed 14:00 B
Intruder and Multi–Phonon States in 108 Cd — •A. Gade, P. von
Brentano, J. Jolie, C. Fransen, A. Linnemann, andV. Werner
— Institut für Kernphysik, Zülpicher Straße 77, 50937 Köln
Therareisotope 108 Cd was investigated using the powerful combination
of two different experimental techniques: γγ–spectroscopy following
the β–decay of 108 In and the non–selective (α, n) fusion evaporation reaction.
This resulted in the observation of 120 new states and more than
580 new transitions, the determination of more than 80 multipole mixing
ratios and eight effective lifetimes resulting from a DSA analysis in the
fusion evaporation reaction.
The proton 2p–2h intruder band, which is typical for near proton–magic
nuclei, was established up to the 4 + member including lower limits for the
absolute transition strengths of inter– and intraband decays. The heavily
suppressed absolute E2 transition strength out of the proposed intruder
band indicates this band structure to be fairly pure. These findings are
compared to neighboring Cd isotopes and related structures.
A further particularly interesting problem is the coupling of the lowest
quadrupole and octupole modes in nuclei. We report on the observation
of the complete quadrupole–octupole coupled quintuplet of negative
parity (2 + 1 ⊗ 3 − 1 ) (J− ) in 108 Cd, the fourth complete quadrupole–octupole
multiplet ever proposed. The energy splitting within the multiplet is calculated
using a simple Hamiltonian which results in an analytical single–
parameter description for the energies.
Partly supported by the DFG under contract Br799/10–1.
HK 30.2 Wed 14:30 B
Isomer spectroscopy and large scale shell model calculations
at the borderline to fission — •H. Grawe1 , K. Hauschild2 , M.
Rejmund2 , E. Caurier3 , F. Nowacki 3 , J. Döring1 , M. Górska1 ,
K. Helariutta4 , P. Jones4 , R. Julin4 , W. Korten2 , M. Leino4 ,
K. Schmidt1 , and J. Uusitalo4 — 1GSI, Darmstadt, Germany —
2 3 DAPNIA/SPhN CEA, Saclay, France — IReS,Strasbourg, France —
4JYFL, Jyväskylä,Finland
Nuclear structure calculations in the complementary mean field and
shell model approaches are limited in their predictive power due to the
neglect of correlations and the model space truncation, respectively. The
availability of large-scale shell model codes enables separation of truncation
effects from deficiencies in the realistic interactions employed.
Progress in detection techniques, such as recoil decay tagging, allows for
γ-ray spectroscopy at the borderline to fission down to cross sections of
< 1µb [1,2]. The N=126 isotones up to 217Pa were studied and compared
to shell model predictions in the full 82≤ Z ≤126 proton model space using
the Kuo-Herling realistic interaction. Excellent agreement is found for
masses, excitation energies and E2 properties, while E3 correlations due
to the neglect of neutron degrees of freedom and 208Pb core excitations
cannot be described. Enhanced pair scattering, besides the expected
L=3 correlations, are found to be responsible for the non-existence of the
Z=92 subshell [1] predicted in early mean field calculations [3].
[1] K. Hauschild et al., Phys. Rev. Lett. 87, 072501 (2001)
[2] R. Herzberg et al., Phys. Rev. C 65, 014303 (2002)
[3] K. Rutz et al., Nucl. Phys. A 634, 67 (1998)
HK 30.3 Wed 14:45 B
Evidence for proton excitations in 130−136Xe isotopes from measurements
of g factors of first excited 2 + and 4 + states + — •K.-H.
Speidel1 , R. Ernst1 , G. Jakob2 , N. Benczer-Koller2 , G. Kumbartzki2
, J. Holden2 , T.J. Mertzimekis2 , A.E. Stuchbery3 , A.
Pakou 4 , P. Maier-Komor5 , A. Macchiavelli6 , M. McMahan6 ,
L. Phair6 ,andI.Y. Lee6 — 1Institut für Strahlen- und Kernphysik,
Univ. Bonn, D-53115 Bonn — 2Dept. of Physics and Astronomy, Rutgers
Univ., New Brunswick, NJ 08903, USA — 3Dept. of Nuclear Physics,
Australian National Univ., Canberra ACT 0200, Australia — 4Dept. of
Physics, Univ. of Joannina, Greece — 5Technische Univ. München,
D-86748 Garching — 6Lawrence Berkeley National Lab., Berkeley, CA
94720, USA
The g factors of the 2 + 1 ,4 + 1 and 2 + 2 states in the stable 130−136 Xe isotopes
have been measured via projectile Coulomb excitation in inverse
kinematics in combination with the transient field technique. Isotopically
pure Xe beams were provided by the 88-inch LBL cyclotron. The results
show a steady decrease in g(2 + 1 ) as the number of neutron holes increases
in the lighter nuclei below the closed N=82 neutron shell. The g factors
of the 4 + 1 states in 132,134 Xe are consistently larger than the g factors of
the 2 + 1 states, a characteristic of proton excitation. In contrast, the g
factors of the 2 + 1 ,4 + 1 and 2 + 2 states in 130 Xe are approximately equal as
would be expected for a vibrational nucleus.
+ supported by BMBF and DFG
HK 30.4 Wed 15:00 B
Magnetic and collective rotation in 79 Br
— •F. Dönau 1 , R. Schwengner 1 , T. Servene 1 , H. Schnare 1 ,
J. Reif 1 , G. Winter 1 , L. Käubler 1 , H. Prade 1 , S . S koda 2 , J.
Eberth 2 , H.G. Thomas 2 , F. Becker 2 , B. Fiedler 2 , S. Freund 2 ,
S. Kasemann 2 , T. Steinhardt 2 , O. Thelen 2 , T. Härtlein 3 , C.
Ender 3 , F. Köck 3 , P. Reiter 3 ,andD. Schwalm 3 — 1 FZ Rossendorf
— 2 Universität Köln — 3 MPI Heidelberg
Excited states of the nucleus 79 Br were investigated via the reaction
76 Ge( 7 Li,4n) at35MeV.Amagneticdipole(M1) band starting at J π =
15/2 − wasobserveduptoJ π = (29/2 − ). Mean lifetimes were deduced
for most of the levels of the M1 band. We have interpreted the M1 band
by applying the hybrid version of the Tilted-Axis-Cranking (TAC) model
together with the shell-correction method. The Total Routhian Surfaces
calculated within the TAC model predict a substantial triaxial deformation
for the excited 3qp configuration π(g9/2) ν(g9/2) ν(fp) assigned to the
M1 band. The comparison of experimental characteristics with predictions
of the TAC calculations shows that the M1 band can be described
by this tilted configuration which implies a strong magnetic component.
On the other hand, considerable contributions of the collective spin are
necessary to generate high spin. The M1 band is therefore considered as
a band including components of both, magnetic and electric rotation.
HK 30.5 Wed 15:15 B
Mixed-symmetry excitations near the Z=38 sub-shell ∗ — •V.
Werner 1 , D. Belic 2 , P. von Brentano 1 , C. Fransen 1 , A. Gade 1 ,
H. von Garrel 2 , U. Kneissl 2 , C. Kohstall 2 , A. Linnemann 1 , A.
Lisetskiy 1 , N. Pietralla 1 , H.H. Pitz 2 , M. Scheck 2 ,andF. Stedile
2 — 1 Institut für Kernphysik, Universität zu Köln — 2 Institut für
Strahlenphysik, Universität Stuttgart
Isovector excitations are particularly sensitive to the proton-neutron
interaction, which plays a fundamental role in the nuclear many-body
system, and which can well be studied, e.g., in light N=Z nuclei. The
investigation of mixed-symmetry (MS) states as, e.g., described in the
IBM-2 framework, gives a complementary approach to the study of the
proton-neutron interaction in other, heavier open-shell even-even nuclei.
The fundamental MSstate, the low-lying one-phonon 2 + ms state, has been
identified in the N=52 nuclei 94 Mo [1] and 96 Ru [2]. We present new
results of a photon scattering experiment on 92 Zr, performed at the Dynamitron
accelerator of the Institut für Strahlenphysik in Stuttgart.
Several J=1 and J=2 states of 92 Zr have been observed and the 2 + 2 state
has been identified as the one-phonon MSstate based on its large M1strength
to the 2 + 1 state. It is shown that the excitation energy of the
2 + ms state is lowered systematically when approaching the Z=38 sub-shell
closure. The discussed structures are also studied in the shell model, and
the results support the MScharacter of the 2 + 2 state of 92 Zr.
[1] N. Pietralla et al., Phys. Rev. Lett. 83, 1303 (1999).
[2] N. Pietralla et al., Phys. Rev. C 64, 031301(R) (2001).
∗ gefördert durch die DFG, Sachbeihilfe Br799/9-3

Nuclear Physics Wednesday
HK31 Nuclear Physics / Spectroscopy V
Time: Wednesday 14:00–15:30 Room: C
Group Report HK 31.1 Wed 14:00 C
Nuclear radii and moments of short-lived isotopes in the range
17−28 Ne — •W. Geithner 1 , S. Kappertz 1 , M. Keim 1 , R. Neugart 1 ,
S.Wilbert 1 , P. Lievens 2 , K. Marinova 3 , K.-M. Hilligsoe 4 , H.
Simon 5 , S. Franchoo 6 , L. Weissman 6 ,andISOLDE Collaboration
6 — 1 Inst. für Physik, Univ. Mainz — 2 K.U. Leuven — 3 Univ. Sofia
— 4 Univ. Aarhus — 5 TU Darmstadt — 6 CERN, Geneva
Laser spectroscopy experiments at the ISOLDE mass separator on
neon isotopes from 17 Ne at the proton drip line to the neutron-rich 28 Ne
have revealed interesting aspects of nuclear structure in the lower sdshell
region. These include the question of a proton halo structure of
17 Ne and the mirror properties in comparison with 17 N, the N = 8 neutron
shell closure as well as the development of single-particle and deformation
properties with the number of neutrons in the sd shell. The
changes of nuclear mean square charge radii, and the magnetic moments
and quadrupole moments are obtained from the measurement of isotope
shifts and hyperfine structure of optical spectral lines. For experiments
on light elements the required accuracy and sensitivity of collinear laser
spectroscopy was achieved by improving the determination of Doppler
shifts and by employing a β-activity detection in combination with stateselective
collisional ionization. Recently, these improvements were also
exploited to complement earlier data on argon isotopes and to investigate
73 Kr for which a remarkably large inverted odd-even staggering was
observed. (Supported by BMBF and EU.)
HK 31.2 Wed 14:30 C
New experimental campaign on the 20 Ne(4 + ) g factor + — •J.
Leske 1 , K.-H. Speidel 1 , O. Kenn 1 , S. Schielke 1 , G. Müller 1 , J.
Gerber 2 , N. Benczer-Koller 3 ,andG. Kumbartzki 3 — 1 Institut
für Strahlen- und Kernphysik, Univ. Bonn, D-53115 Bonn — 2 Institut
de Recherches Subatomiques, F-67037 Strasbourg, France — 3 Dept. of
Physics and Astronomy, Rutgers Univ., New Brunswick, NJ 08903, USA
In view of the eminent role of 20 Ne for nuclear structure calculations the
early measurements of magnetic moments on the first 2 + and 4 + states
have caused tremendeous turmoil (see e.g. [1]). All these experiments
in which the technique of transient magnetic fields was employed have
yielded surprisingly a much smaller g factor for the 4 + state compared
to the 2 + state. It was argued that in analogy to heavy nuclei the pronounced
backbending in 20 Ne might be responsible for this observation.
However, such a scenario would be in striking contradiction with isospin
conservation: for pure T=0 states the g factors of 2 + and 4 + should be
equal to g � +0.5. Sensible T=1 admixtures cannot explain the observed
large difference. New measurements were performed at the Cologne tandem
accelerator in substantially improved experimental conditions. The
states of interest were populated in the reaction 12 C( 12 C, α) 20 Ne using
a technically improved multilayered target with evaporated Gd. Deexcitation
γ rays were measured in coincidence with α particles emitted at
backward and forward angles implying two different Ne velocities. Experimental
details and preliminary results will be discussed.
+ supported by DFG
[1] K.-H. Speidel et al., Nucl. Phys. A378 (1982) 130
HK 31.3 Wed 14:45 C
First γ rays produced by radioactive beams at REX-ISOLDE —
•Heiko Scheit for the MINIBALL collaboration and the REX-ISOLDE
collaboration — Max-Planck-Institut für Kernphysik, Heidelberg
During the commissioning of the REX radioactive beam accelerator
at ISOLDE/CERN in October and November of 2001 one of the MINI-
BALL triple cluster detectors was placed near the target station of the
REX accelerator. The aim was to study the operation of such a detector
under realistic conditions. Especially the γ background due to β decay of
the radioactive beam nuclei, and due to the proximity of the RF cavities
of the accelerator to the experimental station was investigated together
with the influence of the macro- and micro-structure of the REX beam.
In addition to the triple cluster detector a double-sided Si strip detector
was used to detect scattered particles in coincidence with γ rays.
The commissioning of the accelerator went exceptionally well and stable
23 Na and radioactive 24,25 Na isotopes were accelerated to 2 A·MeV
and transmitted to the target station with intensities between 10 5 and 10 7
particles per second, where 58 Ni and Be targets of 1 mg/cm 2 were used
to populate excited states via Coulomb excitation and nuclear reactions.
Preliminary results will be presented and an outlook on the experiments
to be performed at REX-ISOLDE using MINIBALL in 2002 will
be given.
Partly supported by the BMBF.
HK 31.4 Wed 15:00 C
ATRAP on the way to cold antihydrogen — •D. Grzonka for
the ATRAP collaboration — Research Centre Jülich, Germany
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. For high precision measurements of atomic
transitions cold atoms of antihydrogen are essential which requires trapping
techniques. The present first phase of the ATRAP experiment deals
with the production of antihydrogen. In the last year the trapping and
handling of antiprotons and positrons in the trap was studied and optimized
resulting in a loss free trapping over longer periods which is
crucial for any recombination experiments. Furthermore two schemes
for antihydrogen production the Pulsed Field Recombination [1] and the
Three Body Recombination were studied. An intense interaction between
the overlapping antiproton and positron clouds has been achieved which
was demonstrated by the clear observation of a positron cooling of the
antiprotons [2]. It is very likely that in such a configuration also Rydberg
antihydrogen has been produced but the observed signals in the
performed studies are not sufficient for a clear statement. Status and
further steps on the the experimantal studies at ATRAP are given.
[1] C. Wesdorp et al., Phys. Rev. Lett. 84 (2000) 3799.
[2] G. Gabrielse et al., Phys. Lett. 507 (2001) 1.
HK 31.5 Wed 15:15 C
Analyzing-power of pp-bremsstrahlung ∗ — •Andrea Wilms for
the COSY-TOF collaboration — Institut für Experimentalphysik I,
Ruhr–Universität Bochum
The high angular acceptance of the time of flight spectrometer COSY–
TOF and the good emittance of the extracted proton beam make it
possible to measure cross sections of two and three particle reactions
down to the µb region. COSY extracted its first polarized proton beam
with a beam momentum of p = 798.0 MeV/c in Dec. 98, which provides
the possibility to measure polarization observables like asymmetries and
analyzing–powers by using an unpolarized LH2-target.
The event selection and the results for the angular distributions of several
reaction channels in the COSY energy range particularly of �pp–
bremsstrahlung, are presented. Additionally, the evaluation of the beam
polarization by using the well–known analyzing–power Ay of the elastic
proton scattering is shown. ∗ supported by the BMB+F
HK32 Electromagnetic and Hadronic Probes IV
Time: Wednesday 14:00–15:30 Room: D
Group Report HK 32.1 Wed 14:00 D
Neutral meson photoproduction off nuclei — •M. Pfeiffer for
the TAPSand A2 collaboration — II. Physikalisches Institut, Heinrich-
Buff-Ring 16, 35392 Giessen
The photoproduction of mesons allows a detailed study of lower lying
nucleon resonances. A series of experiments has been carried out with
photon energies up to 820 MeV at the Mainz Microtron (MAMI) using
different production targets.
The 3 He experiment focuses on the coherent eta production. Former
experiments on other light targets ( 2 H, 4 He) show small coherent contributions
only. However, the quantum numbers of 3 He suggest a larger
coherent signal. Standard theoretical models of the coherent photoproduction
fail to explain the cross section in the vicinity of the production
threshold, but calculations by Shevchenko et. al. [1] take the possibility

Nuclear Physics Wednesday
of so-called eta-mesic nuclei into account. These quasi bound states of η
and nucleus might be responsible for the near threshold behaviour of the
cross section.
In another experiment, the meson photoproduction off carbon was
studied. This experiment offers the possibility to investigate in-medium
modifications of the ω meson. On the proton, the ω (mω=782 MeV) is
out of reach of the MAMI energy regime. But, assuming a modification
of the omega mass and width in the carbon nucleus, the cross section
for incident photon energies up to 882 MeV becomes measurable. First
results are shown and compared to theoretical calculations [2].
[1] N. V. Shevchenko et.al., nucl-th/0108031
[2] W. Cassing, private communications
HK 32.2 Wed 14:30 D
Static Magnetic Moment of the ∆ + (1232) — •Martin Kotulla
for the TAPS/A2 collaboration — II. Physikalisches Institut, Heinrich-
Buff-Ring 16, 35392 Giessen
Static magnetic moments of baryons are important properties which
provide a crucial test for hadron structure calculations. SU(3) e.g., predicts
µ∆ = Q(∆)µp for the ∆ isobars. Information on µ ∆ + can be obtained
from the observation of a γ transition within the ∆ resonance.
Therefore, the reaction γ p → π ◦ γ ′ p wasmeasuredwiththeBaF2
calorimeter TAPSat the Mainz Microtron accelerator facility. The extraction
of µ ∆ +, however, requires the application of a reaction model.
The experimental results will be presented and the feasibility to extract
µ ∆ + based on theoretical models [1],[2] will be discussed.
[1] D. Drechsel, M. Vanderhaeghen, Phys.Rev.C64:065202,2001
[2] A.I. Machavariani, A. Faessler, to be submitted
HK 32.3 Wed 14:45 D
Photoproduction of pion pairs from nuclei — •Silke Janssen for
the TAPS- und A2 collaboration — II. Physikalisches Institut, Heinrich-
Buff-Ring 16, 35392 Giessen
The photoproduction of pion pairs from nuclei has been studied in the
range of incident photon energies from 400-460 MeV. The experiments
were performed with the tagged photon beam at the MAMI electron accelerator
facility using the photon spectrometer TAPSfor the detection
of neutral and charged pion pairs. The invariant mass distribution of the
two pions shows a different behaviour as a function of the target mass
HK33 Heavy Ions IV
depending on the isospin of the pion pair. For the π 0 π 0 (I=0) channel a
shift in the invariant mass distribution towards the 2π - threshold is observed
for increasing nuclear mass number while no change in the shape
of the invariant mass distribution is found for the π 0 π ± (I=1) channel.
This observation can not be explained by final state interaction but is
consistent with theoretical predictions for a partial restoration of chiral
symmetry at normal nuclear matter density.
[1] R.Rapp et al., Phys.Rev.C 59(99)1237
[2] M.Lutz et al., NPA 542(92)521
[3] T.Hatsuda et al., Phys.Rev.Lett. 82(99)2840
HK 32.4 Wed 15:00 D
Investigation of the 3He(e, e ′ pn)p reaction at MAMI — •P.J.
Barneo — NIKHEF, Amsterdam, in collaboration with the Universities
of Mainz, Tübingen and Glasgow.
The 3He(e, e ′ pn)p reaction has been studied in the spectrometer-hall of
the A1-collaboration at MAMI (Mainz). Data were taken at an energy
transfer of 220 MeV and three-momentum transfer of 375 MeV/c.
The reaction cross section is sensitive to nucleon-nucleon correlations
in the three-nucleon system and the contributions of two-body mechanisms,
i.e. intermediate ∆-excitation and meson-exchange currents.
The data analysis will be discussed and preliminary experimental results
will be compared to existing data for the complementary reaction
3 ′ He(e, e pp)n, measured at AmPS(Amsterdam), and to continuum Faddeev
calculations of the Bochum group, performed with realistic NN interactions.
HK 32.5 Wed 15:15 D
Analyse der Photoproduktion der Vektormesonen ω und Φ—
•Jens Barth for the SAPHIR collaboration — Physikalisches Institut,
Nussallee 12, 53115 Bonn
Zur Analyse der Photoproduktion der Vektormesonen ω und Φ wurden
die beiden Reaktionen γp → pω → pπ + π−π 0 und γp → pΦ →
pK + K− aus den Daten des SAPHIR-Detektors am Elektronen-Stretcher-
Ring ELSA untersucht. Es sind totale und differentielle Wirkungsquerschnitte,
sowie Zerfallswinkelverteilungen im Gottfried-Jackson- und im
Helizitätssystem bei Photonenergien von der Reaktionsschwelle bis zu 2.6
GeV bestimmt worden.
Time: Wednesday 14:00–15:30 Room: E
HK 33.1 Wed 14:00 E
Strangeness production in p+p interactions and collisions of
light ions at Elab=158 AGeV/c — •Claudia Höhne, Volker
Friese, and Falk Pühlhofer for the NA49 collaboration — Fachbereich
Physik, Philipps-Universität Marburg*
New data of the CERN experiment NA49 allow a systematic study of
strangeness production varying not only the beam energy and the centrality
of the interaction but also the size of the colliding system using
protons and light ions as reaction partners. Of particular interest are
small systems in which no phase transition into the QGP is expected
and the role of multiple nucleon-nucleon collisions can be investigated.
According to UrQMD calculations rescattering of newly created particles
should play a minor role in such reactions.
The production of kaons and φ-mesons in p+p, C+C and Si+Si collisions
was measured at the CERN SPS with a beam energy of 158 AGeV.
Phase space distributions of these particles as well as for pions were extracted.
Strangeness enhancement with respect to p+p collisions is found
already in semicentral C+C interactions; it increases further in Si+Si reactions.
*supported by BMBF
HK 33.2 Wed 14:15 E
Correlation Study of Strange Baryons in Pb+Pb Reactions
at 158 AGeV ∗ — •C. Blume 1 , L. Betev 2 , A. Billmeier 2 , R.
Bramm 2 , P. Buncic 2 , P. Dinkelaker 2 , M. Ga´zdzicki 2 , T. Kollegger
2 , I. Kraus 1 , C. Markert 1 , A. Mischke 1 , R. Renfordt 2 ,
A. Sandoval 1 , R. Stock 2 , H. Ströbele 2 , D. Vranić 1 , A. Wetzler
2 ,andJ. Zaranek 2 — 1 GSI Darmstadt — 2 IKF Frankfurt
The large number of strange baryons produced in ultrarelativistic
heavy ion collisions makes the study of their correlations feasible. Of
special interest is the measurement of the correlation function of Λ pairs,
since it can shed light on the nature of their mutual interaction. Since, on
the other side, the interaction of Λs with protons is rather well known,
the pΛ correlation function can be used to extract information on the
spacial extent of the emitting source. Compared to the analysis of pp
correlations this method has the advantage of avoiding the influence of
the Coulomb interaction.
We will present preliminary results on ΛΛ and pΛ correlations in central
Pb+Pb reactions at 158 AGeV. The measurements will be compared to
theoretical caluclations and their implications will be discussed.
∗ Supported by BMBF und GSI
HK 33.3 Wed 14:30 E
Energy Dependence of Kaon and Pion Production in Central
Pb+Pb Collisions — •Roland Bramm 1 , L. Betev 2 , C. Blume 3 ,
P. Buncic 2 , P. Dinkelaker 2 , M. Gazdzicki 2 , T. Kollegger 2 , I.
Kraus 3 , A. Mischke 3 , R. Renfordt 2 , A. Sandoval 3 , R. Stock 2 ,
H. Ströbele 2 , D. Vranic 3 , A. Wetzler 2 ,andJ. Zaranek 2 for the
NA49 collaboration — 1 CERN, Genève — 2 IKF, Universität Frankfurt
— 3 GSI, Darmstadt
The experiment NA49 investigates pion and kaon production in central
Pb+Pb collisions at CERN-SPS energies (20-158 AGeV). The pion
spectra are obtained from the analysis of distributions of all negatively
charged hadrons. The kaon spectra are acquired using the particle identification
based on the analysis of the specific energy loss (dE/dx) and in
the midrapidity region via the analysis of the time of flight data (ToF).
Rapidity and transverse momentum spectra at 40, 80 and 158 AGeV
will be presented. A transition from a ”pion suppression” to a ”pion
enhancement” compared to the p+p data at a collision energy around
40 AGeV is observed. The K+ to pi+ ratio shows a non-monotonic be-

Nuclear Physics Wednesday
haviour with a maximum located close to 40 AGeV. A comparison with
models is included.
HK 33.4 Wed 14:45 E
Directed and elliptic flow in Pb+Pb collisions at 40 A GeV ∗ —
•Alexander Wetzler 1 , Latchezar Betev 1 , Christoph Blume 2 ,
Nicolas Borghini 3 , Roland Bramm 1 , Predrag Buncic 1 ,
Phuong Mai Dinh 4 , Peter Dinkelaker 1 , Marek Ga´zdzicki 1 ,
Thorsten Kollegger 1 , Ingrid Kraus 2 , André Mischke 2 ,
Jean-Yves Ollitrault 4 , Art Poskanzer 5 , Rainer Renfordt 1 ,
Andres Sandoval 2 , Reinhard Stock 1 , Herbert Ströbele 1 ,
Danilo Vranic 2 ,andJacek Zaranek 1 for the NA49 collaboration
— 1 Institut für Kernphysik, Universität Frankfurt — 2 Gesellschaft für
Schwerionenforschung, Darmstadt — 3 Université Libre de Bruxelles
— 4 CEA-Sacclay, Gif-sur-Yvette — 5 Lawrence Berkeley Laboratory,
Berkeley California
Azimuthal distributions of pions and protons have been measured by
the NA49 experiment in Pb+Pb collisions at 40 A GeV over a wide range
in rapidity and tranverse momentum. Analyses in terms of first and second
order Fourrier coefficients [1] and by the cumulant method [2] yield
consistent results for the values of directed (v1) and elliptic (v2) flow.
At 40 A GeV beam energy we obtain values of v1 and v2 averaged over
rapidity and transverse momentum. These results are compared to the
corresponding values at 158 A GeV.
[1] A. M. Poskanzer, S.A. Voloshin, Phys. rev. C58,1671(1998); S.A.
Voloshin, A.M. Poskanzer, Phys. Lett. B474(2000)27 [2] N. Borghini,
P.M. Dinh, J-Y. Ollitrault, Phys. rev. C64(2001)054901
( ∗ )gefördert von BMBF und GSI
HK 33.5 Wed 15:00 E
Centrality and Beam Energy Dependence of HBT Correlations
at SPS — •Heinz Tilsner and Harald Appelshäuser for the
CEREScollaboration — Physikalisches Institut der Universität Heidelberg,
Philosophenweg 12, D-69120 Heidelberg
HK34 Instrumentation and Applications IV
The Analysis of Bose-Einstein momentum correlations of identical pions
(HBT interferometry) provide an ideal tool to gain insight into the
space-time evolution as well as the existence of collective velocity fields
at the time of thermal freeze-out of the pion emitting source, created in
ultra-relativistic collisions of heavy ions.
The CERESspectrometer was upgraded in 1998 by the addition of
a cylindrical Time Projection Chamber (TPC) to improve the momentum
resolution. Furthermore, the upgrade also improved substantially
the hadron detection capability of the spectrometer and allowed for a
systematic investigation of hadronic observables at midrapidity.
We present the centrality and beam energy dependence of two-pion
HBT correlations in 40, 80 and 158 AGeV Pb+Au collisions.
HK 33.6 Wed 15:15 E
Rescattering in Heavy Ion Collisions - Charge Fluctuations —
•Michael Döring 1,2,3 and Volker Koch 1,2 — 1 Theory Group, GSI,
Planckstrasse 1, 64291 Darmstadt — 2 Nuclear Theory Group, LBNL,
Cyclotron Rd. 1, 94720 Berkeley — 3 University of Münster, Dep. of
Theoretical Physics, 48149 Münster
One major goal in heavy ion collisions is to produce evidence of the
quark gluon plasma (QGP). A possible signature is reduced charge fluctuation
due to the fractional charge of the quarks in the QGP. In the
hadronic phase fluctuations may be screened or enhanced caused by
hadronic interaction. Using an effective Lagrangian based on vector dominance,
we calculate the charge fluctuations up to second order in a hot
pion gas applying finite temperature field theory.
Time: Wednesday 14:00–15:30 Room: F
Group Report HK 34.1 Wed 14:00 F
Simulations concerning the design of a general purpose detector
for use at the proposed HESR project at GSI Darmstadt
— •V. Hejny for the Antiproton Physics Study Group collaboration —
Institut für Kernphysik, Forschungszentrum Jülich
A Conceptual Design Report for a major new international facility
at GSI Darmstadt 1 has recently been published. One part covers the
installation of a High-Energy Storage Ring (HESR), in which antiprotons
in a momentum range between 1.5 GeV/c and 15 GeV/c can be
stored. This will allow experiments, for example, concerning charmonium
spectroscopy, the search for hybrids and glueballs and the interaction
of hidden and open charm particles with nucleons and nuclei. It is
proposed to use a modular general-purpose spectrometer, which meets
all basic requirements for these investigations. This has to be proved by
doing a detailed Monte-Carlo simulation of the detector system. These
simulations are done using the OO-based package Geant4 together with
Pluto++ for primary event generation and Root for further data analysis
in an integrated environment. After the presentation of the current
design of the detector - based on the physics goal - and its basic features,
the implementation of the simulation and first results are discussed.
1 Conceptual Design Report: http://www.gsi.de/GSI-Future
Group Report HK 34.2 Wed 14:30 F
Track Reconstruction with Prototypes for ALICE TRD —
•Oliver Busch for the ALICE TRD collaboration — GSI Darmstadt
Hard processes, and in particular studies of charm and beauty production,
have become the center stage for the ALICE physics program. The
Transition Radiation Detector (TRD), in conjunction with other ALICE
detectors, will allow to explore various aspects of dielectron physics,
among them the production of quarkonia like J/ψ, ψ ′ and the members
of the Υ family. The study of such rare probes requires good electron
identification and dedicated triggers to make the relevant signatures
accessible to ALICE with sufficient statistics. The TRD provides the
necessary capabilities to trigger on high pt (>3 GeV) electrons by means
of track reconstruction in a magnetic field.
We have tested prototypes of the TRD composed of a radiator and a
drift chamber with pad readout, filled with a Xe,CO2(15%) mixture and
operated in a magnetic field of up to 0.3 T. The tests have been performed
using the secondary pion beam at GSI Darmstadt with a momentum of
1 GeV/c. We compare results for different shapes of pads as well as
various chamber geometries, in terms of trajectory reconstruction and
single point resolution. As an important application, the Lorentz angle
of ionization electrons drifting in a Xe based mixture has been measured
directly for the first time. This quantity is relevant for the trajectory
reconstruction in the final detector. We present the experimental results
and compare them to GARFIELD calculations.
HK 34.3 Wed 15:00 F
The STAR Level-3 Trigger System ∗ — •Clemens Adler 1 , Jens
Berger 1 , Martin Demello 2 , Thomas Dietel 1 , Dominik Flierl 1 ,
Jeff Landgraf 3 , Söeren Lange 1 , Micheal LeVine 3 , Ante Ljubicic,Jr.
3 , John Nelson 4 , Dieter Röhrich 5 , Reinhard Stock 1 ,
Christof Struck 1 ,andPablo Yepes 2 — 1 Institut für Kernphysik,
Universität Frankfurt, Frankfurt, Germany — 2 Rice University, Houston,
Texas, USA — 3 Brookhaven National Laboratory, Upton, New York,
USA — 4 University of Birmingham, Birmingham, United Kingdom —
5 University of Bergen, Bergen, Norway
The STAR experiment at RHIC is a large acceptantance detector for
the measurement of a wide variety of observables. The STAR Level-3
trigger system is a high level trigger, based on the real-time reconstruction
of the events. A simple analysis of physics observables based on the
particle track information is performed and a trigger decision can be issued.
Central Au+Au collisions can be processed at a rate of up to 50s −1 .
In 2001 the Level-3 system was used for the first time to enhance rare
physics signals in central Au+Au collisions. In earlier runs the Level-3
system has been useful for quality assurance and background rejection.
( ∗ )gefördert von BMBF und GSI

Nuclear Physics Wednesday
HK 34.4 Wed 15:15 F
GRID Computing ∗ — •Rüdiger Berlich — Lehrstuhl für Experimentalphysik
1, Ruhr-Universität Bochum, 44780 Bochum
The availability of high-performance network connections and the need
to process and store huge amounts of data has led to a natural progression
in the way the existing computer infrastructure is perceived and used.
The requirements of the LHC experiments have led to a new paradigm
in distributed computing, called ”the GRID”. The huge amounts of
data produced by the upcoming LHC experiments cannot be processed
entirely at CERN anymore. Instead, processing and storage capacities
from participating institutions around the world are seemlessly bundled
HK35 Plenary Session
together, effectively creating a ”virtual supercomputer”. Today, GRID
computing is an important research topic beyond the boundaries of particle
physics. Within Germany, GRID research is funded by the BMBF,
European-wide projects like the European Data Grid are realised with
the help of the European Union. The talk highlights the current developments
in parallel and distributed computation with special emphasis
on GRID computing. It gives examples from particle physics (BaBar)
and explains the mission of the newly founded competence centre for
GRID computing at the Forschungszentrum Karlsruhe, which will play
an important role in the BaBar computing model.
∗ supported by the BMB+F
Time: Thursday 08:30–10:30 Room: Plenarsaal
Plenary Talk HK 35.1 Thu 08:30 Plenarsaal
The Muon Magnetic Moment — •Klaus Jungmann 1 and on behalf
of the muon g-2 collaboration 2 — 1 Kernfysisch Versneller
Instituut, Zernikelaan 25, NL 9747 AA Groningen — 2 Brookhaven National
Laboratory, Upton, New York, USA
The anomaly of the muon magnetic moment describes the deviation
of the particles magnetic g-factor from the value 2 predicted in the Dirac
theory for spin 1/2 particles. The quantity can be calculated to very
high precision using standard theory. The by far largest contribution
arises from Quantum Electrodynamical effects, i.e. photon and lepton
fields. There are contributions of some 60 ppm due to hadronic vacuum
polarization and some 1.3 ppm from weak interaction. Compared to the
electron magnetic anomaly, the muon is more sensitive to the heavier
particles by the square of the mass ratio. Therefore, precision calculations
and accurate measurements together offer a possibility to search
for physics beyond the standard theory. Either hints to yet unknown
forces in nature may be gained (in case of disagreement) or parameters
in existing speculative models can be significantly bounded (in case of
agreement). At the Brookhaven National Laboratory, USA, a magnetic
storage ring experiment reached a first result which at the time of publication
disagreed with the most recent and most accurate calculations.
Careful reevaluations of the theoretical situation were started and are
being continued. Of special interset are the hadronic contributions in
particular hadronic light by light scattering. The experiment has in the
mean time taken more data which is being analyzed. Work in progressing.
Plenary Talk HK 35.2 Thu 09:00 Plenarsaal
High-temperature QCD and relativistic heavy ion collisions —
•Dietrich Bödeker —Fakutät für Physik, Universität Bielefeld, D-
33516 Bielefeld
Relativistic collisions of large nuclei create strongly interacting matter
at high energy densities. If there are sufficiently many interactions
such a system will thermalize which would allow for a study of Quantum
Chromodynamics at finite temperature. I discuss recent theoretical developments
in this field and their confrontation with experimental data.
Plenary Talk HK 35.3 Thu 09:30 Plenarsaal
Experimental verification of the GDH sum rule at ELSA and
MAMI — •Klaus Helbing for the GDH-Collaboration collaboration
— Erlangen: Universität Erlangen-Nürnberg, Physikalisches Institut,
Abteilung IV, Erwin-Rommel-Str. 1, D-91058 Erlangen
The Gerasimov-Drell-Hearn (GDH) sum rule connects static properties
of the nucleon like the anomalous magnetic moment κ and the nucleon
mass m, with the helicity dependent photoabsorption cross sections σ3/2
and σ1/2, which are observables of the dynamics of the excitation spec-
trum.
�∞
HK36 Plenary Session
0
dν
ν
�
σ3/2(ν) − σ1/2(ν) �
= 2π2 α
m 2 · κ 2
For the first time this fundamental sum rule is verified experimentally
with circularly polarized real photons and longitudinally polarized nucleons.
First results of our measurements on the proton in the photon
energy range 200-800 MeV at the Mainz electron accelerator MAMI have
been published. The measurements of the GDH-Collaboration have been
continued at the accelerator ELSA in Bonn where a tagged photon facility
allows to study photon energies from 680 MeV up to 3 GeV. Our new
data provide up to now unaccessible information about the spin structure
of the proton from the resonance region up to the onset of the Regge
regime.
Plenary Talk HK 35.4 Thu 10:00 Plenarsaal
Compton Scattering off the Nucleon at MAMI Energies —
•Stefan Scherer — Institut für Kernphysik, Johannes Gutenberg-
Universität, 55099 Mainz
In recent years, real and virtual Compton scattering off the nucleon
have attracted considerable interest from both the experimental and theoretical
side. Real Compton scattering gives access to the so-called electromagnetic
polarizabilities containing the structure information beyond
the global properties of the nucleon such as its charge, mass, and magnetic
moment. These polarizabilities have an intuitive interpretation in
terms of induced dipole moments and thus characterize the response of
the constituents of the nucleon to a soft external stimulus. The use
of virtual photons considerably increases the possibilities to investigate
structure and dynamics of the target. The virtual Compton scattering
reaction e − p → e − pγ allows one to map out the local response to external
fields and can be described in terms of generalized electromagnetic polarizabilities.
We will discuss experimental results for the polarizabilities of
the proton which have been obtained at the Mainz Microtron (MAMI)
and compare them with theoretical predictions. A simple classical interpretation
in terms of the induced electric and magnetic polarization
densities is proposed.
Time: Thursday 11:00–12:45 Room: Plenarsaal
Plenary Talk HK 36.1 Thu 11:00 Plenarsaal
Chiral Symmetry and the Medium Modifiaction of Hadrons —
•Jochen Wambach —IKPTU-Darmstadt
A fundamental question in strong interaction physics is how mass is
generated in the sector of light quarks. The answer lies in the nonperturbative
structure of the QCD vacuum itself in which quarks and
gluons condense. This is in marked contrast to the heavy-quark sector
where the masses of the hadrons are determined by the quark masses
themselves. When nuclear matter is subjected to extreme conditions in
density and temperature such as in the interior of neutron stars or in
central relativistic heavy-ion collisions, the QCD vacuum will be altered,
eventually leading to the liberation of the elementary constituents in a
new state of matter. Such a restructuring of the vacuum must be accompanied
by significant changes in the spectral properties of hadrons. In
the framework of effective field theory this relationship and observable
consequences for the meson spectrum will be addressed.

Nuclear Physics Thursday
Plenary Talk HK 36.2 Thu 11:45 Plenarsaal
Search for Missing Baryon Resonances — •Ulrike Thoma —
Thomas Jefferson National Laboratory, 12000 Jefferson Avenue, Newport
News, VA 23606, USA
It is widely accepted that QCD is most probably the correct theory of
strong interactions. But a major goal of QCD is still unfulfilled: to provide
the theory of quark confinement. Instead, constituent quark models
have been developed which describe the baryon spectrum with good success.
However there is an interesting controversy in baryon spectroscopy.
Constituent quark model calculations predict much more resonances than
have been observed so far. Two very different explanations have been
proposed:
1) The ”missing” states are not missing. They have not been observed
so far because of lack of high quality data in channels different from πN.
If these states decouple from πN they would not have been observed so
far.
2) The ”missing” states are not missing, they do not exist. The
nucleon-resonances could have a quark-diquark structure. This reduces
the number of internal degrees of freedom and therefore the number of
existing states.
Photoproduction experiments investigating channels different from πN
are expected to have a big discovery potential if these states really exist.
This is one of the goals of the CB-ELSA experiment in Bonn and of the
CLASexperiment at Jefferson Laboratory. Recent progress in the search
for these ”missing” states will be discussed.
HK37 Theory V
Plenary Talk HK 36.3 Thu 12:15 Plenarsaal
THE ROLE OF NUCLEAR PHYSICS IN PROVIDING DATA
FOR ASTROPHYSICS — •Stephane Goriely —IAA-Universite
Libre de Bruxelles, CP 226, Campus de la Plaine, B-1050 Brussels
Impressive progress has been made for the last decades in the various
fields related to nuclear astrophysics. However, major problems and
puzzles remain, which challenges continuously the nuclear astrophysics
concepts and findings. To put them on a safer footing requires a deeper
and more precise understanding of the many nuclear physics processes
operating in the astrophysical environment.
More specifically, major difficulties related to the specific conditions of
the astrophysical plasma remain (capture of charged particles at low energies,
large number of nuclei and properties to consider, exotic species,
high-temperature and/or high-density environments, ...). In many astrophysical
scenarios, only theoretical predictions can fill the gaps. The
nuclear ingredients to the reaction or weak interaction models should
preferentially be estimated from microscopic global predictions based on
sound and reliable nuclear models which, in turn, can compete with more
phenomenological highly-parametrized models in the reproduction of experimental
data. The latest developments made in deriving the nuclear
inputs of relevance in astrophysics applications are reviewed. Emphasis
is made on the possibility to make use of reliable microscopic models for
practical applications.
Time: Thursday 14:00–15:30 Room: A
Group Report HK 37.1 Thu 14:00 A
Dynamical Correlations in In-Medium Hyperon and Nucleon
Interactions — •Ch. Keil, H. Lenske, andC. Greiner — Institut
für Theoretische Physik, Universität Gießen, Germany
The extension of isospin nuclear structure physics into the full SU(3)f
flavor sector is investigated in a field-theoretical approach using Dirac-
Brueckner theory and the DDRH field theory for finite nuclei. Baryonbaryon
interactions in free space and hadronic matter are calculated in a
SU(3)f scheme by solving the K-Matrix equations for the lowest meson
nonets and baryon octets. Results for BB interactions in infinite hadronic
matter are presented. The structure of correlated two-baryon wave functions
in nuclear matter is discussed and applications in HBT-analyses of
hyperon production in heavy ion collisions are indicated. DDRH theory is
used to extract density dependent meson-baryon vertices, allowing applications
to finite nuclei in a covariant and thermodynamically consistent
approach. RMF calculations for single Λ hypernuclei are in good agreement
with observed hyperon separation energies and spin-orbit splittings.
The ΛΛ correlation energy, however, derived experimentally from recent
measurements of 6 ΛΛHe is underestimated, indicating that correlation dynamics
are likely to play an important role for in-medium hyperon interactions.
Taking into account loop diagrams extensions of the theory
beyond the ladder-approximation are envisaged. As a first application
we determine from a re-analysis of the Urbana nuclear equation of state
the content of RPA loop diagrams. They are found to introduce a density
dependence, shifting the equilibrium point to the empirical position.
Work supported by BMBF.
HK 37.2 Thu 14:30 A
Medium Effects in Ae, e ′ p Reactions at High Q 2 — •Dimitri Debruyne
and Jan Ryckebusch — INW, proeftuinstraat 86, B-9000
Gent, Belgium
Medium dependencies of bound nucleons are studied in a fully relativistic
and unfactorized framework for the description of exclusive A(e,e’p)
processes. The theoretical framework, which is based on the eikonal approximation,
can accommodate both optical-potential and Glauber approaches
for the treatment of final-state interactions. We have performed
calculations for the target nuclei He4, C12 and O16 in kinematic situations
corresponding with Q 2 values in the range 0.5 ≤Q 2 ≤ 10 (GeV/c) 2 .
One of the major findings of our investigations is that in kinematic
regions where both the optical-potential and the Glauber approach seem
justified, both methods for treating final-state interactions produce comparable
results. We have not found any evidence for the onset of the
color transparency phenomenon below Q 2 ≤ 8(GeV/c) 2 .
Another issue which has received our attention is the predicted medium
modification of the electromagnetic form factors for bound nucleons. By
incorporating model predictions for the medium dependence of the electromagnetic
form factors in our theoretical framework, we can estimate
the effect on the (�e, e ′ �p) observables as a function of the nuclear density
and Q 2 .
HK 37.3 Thu 14:45 A
Strangeness photoproduction on the nucleon in the resonance
region — •Stijn Janssen and Jan Ryckebusch — Proeftuinstraat
86, 9000 Gent, Belgium
A study of three strangeness photoproduction processes on the proton
(γp → K + Λ, γp → K + Σ 0 and γp → K 0 Σ + )withinaneffectiveLagrangian
formalism is presented [1,2]. By comparing model calculations
to the SAPHIR data, we explore the contributions from different N ∗ and
∆ ∗ resonances in the reaction mechanism. Special attention is paid to
the issue of the “missing resonances”. Some of those missing nucleon
states are expected to be revealed in these strange channels. In addition,
we survey the sensitivity of the extracted resonance information to the
uncertainties inherent to the treatment of the background contributions.
We show that those background terms inevitably produce a dominant
part of the reaction amplitude and compare predictions obtained with
three plausible techniques of dealing with those terms. We conclude that
model dependent effects can not be neglected in the analyses at this
stage.
[1] S. Janssen, J. Ryckebusch, W. Van Nespen, D. Debruyne and
T. Van Cauteren, Eur. Phys.J. A 11, 105 (2001)
[2] S. Janssen, J. Ryckebusch, D. Debruyne and T. Van Cauteren,
Phys. Rev. C 65, 015201 (2001)
HK 37.4 Thu 15:00 A
Contribution of Single Pion Photoproduction to Spin Asymmetry
and GDH Sum Rule for the Deuteron — •Eed Darwish 1,2 ,
Hartmuth Arenhövel 1 ,andMichael Schwamb 1 — 1 Institut für
Kernphysik, J. Gutenberg-Universität, J.-J. Becher-Weg 45, D-55099
Mainz, Germany — 2 Physics Department, Faculty of Science, South Valley
University, Sohag, Egypt
The contribution of incoherent single pion photoproduction to the spin
asymmetry for the deuteron is evaluated up to 550 MeV photon energy
with inclusion of NN and πN rescattering in the final state. For the
elementary production operator γN → πN, we have taken into account
the standard pseudovector Born terms as well as the contribution of the
∆(1232) resonance [1]. For the NN and πN interactions we use the separable
representations from Haidenbauer et al. [2] and Nozawa et al. [3],
respectively.

Nuclear Physics Thursday
The effect of final state rescattering on the spin asymmetry for pion
photoproduction on the deuteron is discussed. The corresponding
Gerasimov-Drell-Hearn integrals evaluated up to 550 MeV are also
presented.
It turns out that the inclusion of final state interaction is important
and should be considered in forthcoming theoretical studies.
[1] R. Schmidt et al., Z.Phys.,A355 (1996), 421
[2]J.Haidenbaueret al., Phys.Rev.,C30 (1984), 1822
[3] S. Nozawa et al., Nucl. Phys., A513 (1990) 459
HK 37.5 Thu 15:15 A
Strong two-body decays of baryons in a covariant quark model
— •Dirk Merten, Ulrich Löring, Sascha Migura, Bernard
Metsch, andHerbert-R. Petry — Institut für Theoretische Kernphysik,
Nussallee 14-16, D-53115 Bonn, Germany
HK38 Theory VI
Strong two-body baryon decays are considered in a covariant quark
model for baryons and mesons. The model is based on the Bethe-Salpeter
equation in instantaneous approximation with a phenomenological confinement
potential and a residual interaction induced by instantons. The
parameters have been fixed to the spectra of meson and baryon resonances.
The widths of strong two-body baryon decays are then evaluated
without any additional free parameter in a formally covariant way.
Time: Thursday 14:00–15:30 Room: C
HK 38.1 Thu 14:00 C
Bottom-Antibottom and Quarkonium Hadroproduction in k⊥-
Factorization at High Energies — •Philipp Hägler 1 , Roland
Kirschner 2 , Andreas Schäfer 1 , Lech Szymanowski 3 ,andO.V.
Teryaev 4 — 1 Institut für Theoretische Physik, Universität Regensburg,
D-93040 Regensburg — 2 Institut für Theoretische Physik, Universität
Leipzig, D-04109 Leipzig — 3 Centre de Physique Theorique, Ecole Polytechnique,
91128 Palaiseau Cedex, France — 4 Bogoliubov Laboratory of
Theoretical Physics, JINR, 141980 Dubna
We have studied the hadroproduction of b ¯ b, direct χc and J/ψ in the
framework of the k⊥ factorization approach at high energies. The NLLA
BFKL q¯q-production vertex provides a gauge invariant description of the
processes and plays a central role in our considerations. The calculated b ¯ b
cross sections are significantly larger than in the collinear approach and
give a good description of the Tevatron data. Concerning Quarkonium
production we find that the color-singlet contributions are essentially
larger than in the collinear approach. For the J/ψ the color singlet contribution
is still an order of magnitude below the data. This deficit may
be well described in the framework of NRQCD by color octet contribu-
tions. The value of the color octet matrix element < 0|O J/ψ
8 ( 3 S1)|0 > is
substantially decreased in comparison with fits in the collinear factorization.
This should lead to a reduction of the large transverse polarization,
predicted in the collinear approach.
HK 38.2 Thu 14:15 C
Confinement in the Chromodielectric Model — •Gunnar
Martens, Carsten Greiner, Stefan Leupold, and Ulrich
Mosel — Institut für Theoretische Physik, Universität Gießen,
Germany
The phenomenon of confinement is an open problem and not understood
from first principles. The chromodielectric model [1,2] describes it
as the consequence of the interaction between color electromagnetic fields
and the vacuum having dielectric properties. The vacuum is described
via a scalar field with selfinteraction designed to separate perturbative
from nonperturbative spatial regions. We investigate static properties of
meson and baryon type configurations. For the mesons, we find the linear
rising string potential and reproduce the string tension found in heavy
quark meson spectroscopy. For the three quark system we study the field
configuration to distinguish between the ∆ and the Y type models of the
baryon.
Work supported by BMBF.
[1] R. Friedberg, T.D. Lee; Phys.Rev. D 15 (1977) 1694
[2] C.T. Traxler, U. Mosel, T.S. Biro; Phys.Rev. C 59 (1999) 1620
HK 38.3 Thu 14:30 C
The Spectrum of the Dirac Operator in the linear sigma model
with Quarks — •Thomas Spitzenberg 1 , kai Schwenzer 2 , and
hans juergen pirner 2 for the Chiral dynamics Mainz Heidelberg
collaboration — 1 institut fuer kernphysik, uni-mainz, johann-joachim
becher weg 45, 55099 mainz, germany — 2 institut fuer theoretische
physik, uni heidelberg, phil. weg 19,69120 Heidelberg, germany
The QCD Dirac operator spectrum in the large NC approximation is
derived using renormalization group flow equations. The spectrum is
presented beyond the usual low energy regime.
HK 38.4 Thu 14:45 C
Photoproduction of φ mesons off nuclei — •Pascal Mühlich,
Thomas Falter, Carsten Greiner, Jürgen Lehr, Marcus Post,
and Ulrich Mosel — Institut für Theoretische Physik, Universität
Gießen, Germany
We investigate the consequences of possible medium modifications of
the φ mesoninnuclearmatteronφ photoproduction off nuclei. Various
models predict both a mass-shift and/or a in-medium broadening of the
φ meson at finite nuclear matter density [1][2]. In principle, photoproduction
provides a clean method to learn about the in-medium properties
of the φ meson. Our purpose is to check the feasability of a proposed
experiment [3], in which one tries to observe the φ properties through the
K + K − -invariant mass spectrum, restricting the momentum of the φ to
small values. In our calculation, we use the BUU transport model, which
allows for a detailed analysis of the final state interactions both of the φ
and the kaons. Due to these effects, we find only a small sensitivity of
the K + K − -invariant mass distribution on the in-medium properties of
the φ.
Work supported by DFG and BMBF.
[1] G. E. Brown, M. Rho, PRL 66 (1991), 2720.
[2] E. Oset, A. Ramos, NPA 679 (2001), 616.
[3] T. Nakano et al., NPA 684 (2001), 71.
HK 38.5 Thu 15:00 C
Chiral Dynamics and Nuclear Matter — •Stefan Fritsch 1 , Norbert
Kaiser 1 ,andWolfram 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
) two-pion exchange
(modulo functions of kf/mπ). Already at order O(k4 f
produces realistic nuclear binding. Without inclusion of any further
short-range terms the empirical saturation point and nuclear compressibility
K � 250 MeV are well reproduced at order O(k5 f) with a momentum
cut-off of Λ � 0.65 GeV. In the same framework we calculate the
density-dependent asymmetry energy, reproducing its empirical value of
A0 � 34 MeV. We also evaluate the momentum and density dependent
single particle potential of nucleons in isospin-symmetric nuclear matter.
The contributions from one- and two-pion exchange diagrams give
rise to a potential depth for a nucleon at rest of U(0,kf0) =−53.2MeV
at saturation density. The momentum dependence of the single particle
potential can be translated into a mean effective nucleon mass of
¯M ∗ � 0.8M. Finally, we extend our scheme to small non-zero temperatures
and observe the liquid–gas phase transition of nuclear matter at
Tc � 26 MeV and ρc � 0.5ρ0.
Work supported in part by BMBF, GSI and DFG.

Nuclear Physics Thursday
HK 38.6 Thu 15:15 C
Proton–antiproton annihilation and the partonic structure of
the nucleon — •A. Freund 1 , A.V. Radyushkin 2 , A. Schäfer 1 ,
O.V. Teryaev 3,1 ,andC. Weiss 1 — 1 Institut für Theoretische Physik,
Universität Regensburg, D–93053 Regensburg, Germany — 2 Theory
Group, Jefferson Lab, Newport News, VA 23606, USA, and Old Dominion
University, Norfolk, VA 23529, USA — 3 Laboratory of Theoretical
Physics, JINR Dubna, Russia
We consider exclusive proton–antiproton annihilation into two photons,
p¯p → γγ, ats ≫ m 2 N, which could be studied with the proposed
1–15 GeV antiproton storage ring (HESR) at GSI [1]. We argue that
in QCD this process is dominated by contributions in which the two
photons are emitted in a single quark–antiquark annihilation process,
HK39 Nuclear Physics / Spectroscopy VI
accompanied by soft annihilation of the spectators (“handbag graph”).
This description is analogous to the “soft mechanism” dominating wide–
angle real Compton scattering off the proton [2]. The amplitude for p¯p
annihilation can thus be expressed in terms of a function describing the
decay of the p¯p system into a q¯q pair. This function is the deeply timelike
variant of the double distribution of quarks measured in wide–angle real
and also deeply virtual Compton scattering (generalized parton distributions).
We present an estimate of the expected annihilation cross section
based on a simple model for the decay function, and discuss experimental
signatures for the dominance of the “handbag” mechanism.
[1] “An International Accelerator Facility for Beams of Ions and Antiprotons”,
GSI Conceptual Design Report, November 2001
[2] A. V. Radyushkin, Phys. Rev. D58 (1998) 114008
Time: Thursday 14:00–15:15 Room: B
Group Report HK 39.1 Thu 14:00 B
Neutron decay studies of the Isoscalar Giant Dipole Resonance
— •M. Hunyadi 1 , A.M. van den Berg 1 , N. Blasi 2 , B. Davids 1 , U.
Garg 3 , J. Gulyás 4 , M.N. Harakeh 1 , M.A. de Huu 1 , D. Sohler 4 ,
and H.J. Wörtche 1 — 1 Kernfysisch Versneller Instituut, Groningen,
The Netherlands — 2 INFN Milano, Milano, Italy — 3 University of Notre
Dame, Notre Dame, USA — 4 Institute of Nuclear Research, Debrecen,
Hungary
The Isoscalar Giant Dipole Resonance (ISGDR) is the response of the
nucleus to the second-order isoscalar dipole operator. motion). Its energy
systematics are important in the determination of the nuclear incompressibility.
So far, only singles experiments, using inelastic α-scattering,
gave evidence for the ISGDR in a few nuclei, but they suffered from
strong instrumental and nuclear-continuum backgrounds at very forward
angles, and a partial overlap with the isoscalar giant octupole resonance.
Presently, no experimental data are available on the decay properties of
the ISGDR, which would be a crucial test for the theoretical descriptions
of its microscopic structure and damping process.
Recently we performed coincidence experiments using inelastic α- scattering
at 50 MeV/A searching for the direct neutron decay of the ISGDR
in 208 Pb, 124 Sn and 90 Zr. A clear indication of the presence of the direct
decay component was obtained. Moreover, we exploited the advantage of
the coincidence technique resulting in a considerable suppression of the
background contribution. These results enabled the direct comparison
with a recently published CRPA calculation.
HK 39.2 Thu 14:30 B
Search for triaxial superdeformation in 170 Hf* — •A. Neusser 1 ,
S. Bhattacharya 2 , P. Bringel 1 , D. Curien 3 , O. Deveraux 3 , J.
Domscheit 1 , G.B. Hagemann 4 , F. Hannachi 5 , H. Hübel 1 , D.R.
Jensen 4 , A. Lopez-Martens 5 , E. Mergel 1 , N. Nenoff 1 ,andA.K.
Singh 1 — 1 Institut für Strahlen- und Kernphysik, Univ. Bonn — 2 SINP,
Calcutta — 3 IReS, Strasbourg — 4 Niels Bohr Institute, Copenhagen —
5 CSNSM, Orsay
Triaxial superdeformation (TSD) has recently been established in Lu
and Hf isotopes in the mass 165 region. In this work we report on the
first evidence for TSD in 170 Hf. High-spin states in 170 Hf have been populated
at the Vivitron accelerator of IReS, Strasbourg, using the reaction
124 Sn( 50 Ti,4n) at 216 MeV beam energy. Gamma-ray coincidences were
detected with the EUROBALL spectrometer. A preliminary analysis of
the coincidence data leads to an extension of all known normal-deformed
(ND) bands in 170 Hf to higher spins. In addition, one new ND band has
been found. First results of the search for TSD in 170 Hf revealed a band
with similar characteristics as the TSD bands in neighbouring 168 Hf.
*Work supported by BMBF, Germany (Contract no. 06 BN 907) and
by DFG (Contract no. HU 325/10)
HK 39.3 Thu 14:45 B
Dipole strength distribution in the well deformed nucleus 178 Hf
and the systematics of the Scissors Mode in the even-even Hf
nuclei — •M. Scheck 1 , D. Belic 1 , P. von Brentano 2 , J.J. Carrol
3 , A. Gade 2 , H. von Garrel 1 , U. Kneissl 1 , C. Kohstall 1 ,
A. Linnemann 2 , H.H. Pitz 1 , F. Stedile 1 , R. Toman 3 , and V.
Werner 2 for the collaboration — 1 Institut für Strahlenphysik, Universität
Stuttgart,D-70569 Stuttgart — 2 Institut für Kernphysik, Universität
zu Köln, D-50937 Cologne — 3 Dep. of Physics and Astronomy,
Youngstown State University, USA
The strength distribution of low-lying dipole excitations in 176 Hf was
studied in nuclear resonance fluorescence experiments (NRF) performed
at the Stuttgart bremsstrahlung facility (endpoint energy 4.1 MeV).
Spectroscopic information on about 40 new spin 1 states in 176 Hf have
been obtained. Ascribing to all observed K=1 states a positive parity,
the detected total B(M1) ↑ strength in the energy range of the Scissors
Mode amounts to 3.1(4) µ 2 N as for midshell rare earth nuclei [1] and is
higher as in 178,180 Hf [2]. The M1 strength in 176 Hf fits well into the systematics,
however, is more fragmented as in 178,180 Hf. On the other hand,
the distribution patterns look quite similiar in all even-even Hf isotopes,
with two strength concentrations at 2.7 and 3.7 MeV, respectively.
Supported by the DFG, contract Nos. Kn-154/31, Br-799/6,
[1] U. Kneissl et al., Prog. Part. Nucl. Phys. 37, (1996), 349.
[2] N. Pietralla et al., Nucl. Phys. A618, (1997), 147.
HK 39.4 Thu 15:00 B
Lifetimes of triaxial superdeformed states in 163 Lu and 164 Lu ∗ —
•G. Schönwaßer 1 , H. Hübel 1 , G.B. Hagemann 2 , J. Domscheit 1 ,
A. Görgen 1 , B. Herskind 2 , G. Sletten 2 , J.N. Wilson 2 , D.R.
Napoli 3 , C. Rossi-Alvarez 4 , D. Bazzacco 4 , R. Bengtsson 5 , H.
Ryde 6 , P.O. Tjøm 7 ,andS.W. Ødeg˚ard 7 — 1 ISKP, Univ. Bonn,
Germany — 2 NBI, Copenhagen, Denmark — 3 LNL, Legnaro, Italy —
4 Dip. di Fisica, Univ. Padova, Italy — 5 Dep. of Math. and Phys., Lund
Inst. of Technology, Sweden — 6 Dep. of Phys., Univ. Lund, Sweden —
7 Dep. of Phys., Univ. Oslo, Norway
Lifetimes of states in the yrast superdeformed bands of 163 Lu and
164 Lu were determined in a Doppler-shift attenuation-method experiment.
High-spin states were populated in the reaction 139 La( 29 Si,xn) at
145 MeV. The beam was provided by the Legnaro Tandem accelarator.
Gamma-ray coincidences were measured with the GASP Ge-detector ar-
ray. From fractional Doppler-shifts and line shapes, average transition
quadrupole moments, Qt =8.2 +1.0
−0.6 band7.1 +0.5
−0.6 b, were deduced for one
of the bands in 163 Lu and 164 Lu, respectively. These values are much
larger than the quadrupole moment of the normal-deformed yrast band
in 163 Yb, Qt =4.9 +1.3
−0.4 b, that was also determined in this experiment.
Comparison to cranking calculations indicates that both superdeformed
bands correspond to a local potential energy minimum with a pronounced
triaxiality, γ ∼ 20 0 .
∗ Work supported by BMBF, Germany (contract no. 06 BN 907) and
by the EU (TMR/LSF contract no. ERBFMGECT980110)

Nuclear Physics Thursday
HK40 Electromagnetic and Hadronic Probes V
Time: Thursday 14:00–15:30 Room: D
Group Report HK 40.1 Thu 14:00 D
Electroproduction of Strangeness on Light Nuclei ∗ — •Frank
Dohrmann for the E91016 collaboration — FZ Rossendorf, Inst. f.
Kern- u. Hadronenphysik, Dresden, Germany
Jefferson Lab experiment E91016 recently studied the electroproduction
of kaons, A(e,e ′ K + ), on targets of H2, D2, 3 He, 4 He, C and Al. The
variety of nuclear targets involved allows for a study of the dependences
of the elementary processes involving strange hadrons upon both mass
number and nuclear density. In particular, the measurements on 3,4 He
are the first performed. Results for the missing mass spectra from the
various targets will be shown. Quantitative descriptions of these spectra
need to take into account hyperon-nucleon (YN) final state interactions
that are sensitive to YN potentials. The quasifree production cross sections
and their angular and energy dependence for the Λ and Σ hyperons
on the various target nuclei will be presented. It is of special interest
to determine if the elementary production mechanisms are subject to
medium modifications. Specifically, since the Λ and Σ hyperons have
different isospins, medium modifications may have potentially different
effects on the production of these hyperons. The presence of Λ and pos-
sible Σ hypernuclear states will be addressed. We see clear evidence for
the 4 ΛH on 4 He as well as the 12
Λ B bound state on carbon. ( ∗ this work
was supported in part by the A.v.Humboldt-Stiftung through a Feodor
Lynen-Fellowship)
HK 40.2 Thu 14:30 D
First results of the CB-ELSA experiment — •Volker Credé for
the CB-ELSA collaboration — ISKP, University of Bonn
Constituent quark models predict far more states in the baryon
spectrum than have been experimentally observed up to now. As nearly
all results stem from πN scattering, photoproduction experiments seem
to have a large discovery potential. The search for missing resonances is
a topical aim of the CB-ELSA experiment. A large amount of data has
been taken with a new setup since December 2000 at the e − accelerator
ELSA in Bonn. In a first series of experiments, the Crystal Barrel
Detector was used in a combination with Time-Of-Flight walls in the
forward direction. This setup almost forms a 4π arrangement and was
used to measure a variety of multi-photon final states. Almost 200 000
events of the type γp → pπ 0 π 0 and 40 000 events of the type γp → pπ 0 η
could be identified and reconstructed. First hints for resonance
production is given and cascades of the type N ∗∗ → N ∗ → π 0 π 0 (π 0 η)p
are observed. Indications for a P33(1940)∆ are seen. Furthermore,
differential cross sections for η photoproduction up to 2.8 GeV could
be extracted from the data. Good consistency is found for η → γγ as
well as for η → 3π 0 . In addition, reactions of the type γp → pω and
γp → pπ 0 ω are being analysed. The combined investigation of all these
channels will help to answer questions as to what the relevant degrees
of freedom and effective forces in hadrons are.
Supported by DFG.
HK41 Heavy Ions V
HK 40.3 Thu 14:45 D
Study of pηη, pω, pπ 0 ω and pη ′ final states observed by the
CB-ELSA-Experiment — •Jörg Junkersfeld for the CB-ELSA
collaboration — ISKP, Universität Bonn
One aim of the Crystal-Barrel-Experiment at ELSA is the study of
high-mass nucleon resonances in photoproduction off protons in a liquid
hydrogen target. The detector system covers a large solid angle (98 %
of 4π in the lab sytem) and has a large angular and energy resolution.
These features allow the investigation of final states with high photonmultiplicity.
Data at photon energies up to 2.8 GeV were taken. From
these data 200000 pπ 0 π 0 and 40000 pπ 0 η events were identified. The
covered energy range gives also access to rare final states like pηη, pω,
pπ 0 ω and pη ′ . The search for these final states and the first results will
be presented.
Supported by DFG.
HK 40.4 Thu 15:00 D
Photoproduction of π 0 π 0 on protons at CB-ELSA — •Igor Horn
for the CB-ELSA collaboration — ISKP, Universität Bonn
The Crystal Barrel is a detector optimized to detect multiphoton final
states with a large solid-angle coverage. During the last year photoproduction
data including various final states with neutral mesons were taken
by the CB-ELSA experiment at the electron stretcher accelerator (ELSA)
in Bonn. In particular attention is paid to the γp→pπ 0 π 0 reaction. The
data show clear structures due to resonance production. Evidence for
successive decays of high-mass nucleon resonances via ∆ (1232) and via
resonances of higher mass is observed in different mass regions. The new
data taken at photon energies up to 2.8 GeV will be presented.
Supported by DFG.
HK 40.5 Thu 15:15 D
Quasifree bremsstrahlung in the dp → dpγ reaction above the
pion production threshold — •L. Demirörs 1 , J. Greiff 2 , Y. Ilyina
1 , C. Pauly 1 ,andW. Scobel 1 for the CELSIUS/WASA collaboration
— 1 Institut für Experimentalphysik, Hamburg University, Luruper
Chaussee 149, D–22529 Hamburg — 2 The Svedberg Laboratory, Thunbergsvägen
5A, Box 533, S–75121 Uppsala
Experimental results of the dp → dpγ reaction are presented for
several observables with deuteron projectile energies between 437
MeV and 559 MeV. Measurements were initially performed with the
PROMICE/WASA setup, located at the CELSIUS storage ring [1]. Due
to the limited acceptance of the detector, only a fraction of the phase
space was accessible, that revealed a dominance of a quasifree reaction
mechanism. To investigate competing mechanisms, recent measurements
were carried out with the CELSIUS/WASA setup, which has a nearly
4π–acceptance of the solid angle. Results of both measurements will be
shown and discussed.
[1] J. Greiff et al. Phys. Rev. C66 (2002)
Time: Thursday 14:00–15:30 Room: E
Group Report HK 41.1 Thu 14:00 E
Development and Series Production of the ALICE TPC
Readout Chambers — •Danilo Vranic 1 , Gerd Augustinski 1 ,
Peter Braun-Munzinger 1 , Heinz Daues 1 , Ulrich Frankenfeld
1 , Chilo Garabatos 1 , Joerg Hehner 1 , Rudolf Schmidt 1 ,
Herbert Stelzer 1 , Peter Glässel 2 , Bernd Windelband 2 ,and
Rainer Renfordt 3 — 1 GSI Darmstadt — 2 Universität Heidelberg —
3 Universität Frankfurt
The Time Projection Chamber (TPC) is the central detector of the AL-
ICE experiment at the LHC. It is designed to operate at unprecedented
particle multiplicities - up to 25000 charged particles may be produced in
a central PbPb collision into the TPC acceptance. This puts special and
unusual requirements on the read-out chambers. The chambers have to
run, e.g., at an average gain of 20000 and with expected currents exceeding
10 micro-amperes. In this presentation we report on the design and
testing of these read-out chambers and describe in detail their perfor-
mance. This includes optimization of the wire and pad geometry as well
as beam tests with a full size prototype at the SIS. We further report on
the development of a detailed production plan for all 72 modules covering
an area of about 36 sqm, including various quality control measures and
acceptance tests. Finally, the actual status of the production is given.
HK 41.2 Thu 14:30 E
The ALICE Transition Radiation Detector — •Johannes P.
Wessels for the ALICE-TRD collaboration — Physikalisches Institut,
Universität Heidelberg
In this talk an overview of the ALICE Transition Radiation Detector
(TRD) is presented. The ALICE TRD consists of 540 individual detector
modules with a total of 1.2 million readout channels. It allows
electron identification above a momentum of 1 GeV/c and it will be capable
of providing a very fast and efficient trigger for electrons with large
transverse momentum pt. The detector will operate in the very high multiplicity
environment of heavy-ion collisions at the Large Hadron Collider

Nuclear Physics Thursday
(LHC), where rapidity densities of charged particles up to dN/dy = 8000
are anticipated in collisions of Pb nuclei at √ s =5.5 ATeV.
Along with a general overview of the detector, results from extensive
in-beam tests with regard to transition radiation yield, pion rejection,
and tracking performance will be presented. Using the experimental data
the performance of the fast electron trigger has been simulated. Finally,
the anticipated performance of the trigger for quarkonia measurements
at central rapidity will be demonstrated.
HK 41.3 Thu 14:45 E
Investigation of the event anisotropy with the CERES/NA45
experiment — •Jana Slivova and Jovan Milosevic for the
CERES/NA45 collaboration — Physikalisches Institut der Universität
Heidelberg, Philosophenweg 12, 69120 Heidelberg
Using the data obtained at the CERES/NA45 experiment the elliptic
event anisotropy was studied in Pb+Au collisions at 40, 80, and 158
AGeV/c. This anisotropy is quantified by the second Fourier coefficient
(v2). Results are obtained both for identified pions and for charged particles.
We will compare values of v2 obtained using different methods
- standard flow analysis with respect to the reaction plane, two-particle
correlations, and preliminary results from the recently introduced method
of cumulants (Phys. Rev. C 63, 054906 (2001)).
HK 41.4 Thu 15:00 E
Charge fluctuations in nuclear collisions: experimental results
and model studies. — •Jacek Zaranek 1 , P. Dinkelaker 1 , L.
Betev 1 , C. Blume 2 , R. Bramm 1 , P. Buncic 1 , M. Ga´zdzicki 1 ,
T. Kollegger 1 , I. Kraus 2 , A. Mischke 2 , R. Renfordt 1 , A.
Sendoval 2 , R. Stock 1 , H. Ströbele 1 , D. Vranic 2 ,andA. Wetzler
1 for the NA49 collaboration — 1 University of Frankfurt, IKF —
2 GSI, Darmstadt
HK42 Instrumentation and Applications V
Study of event-by-event fluctuations of electric charge in high energy
nucleus-nucleus collisions may provide information on the state of matter
in an early stage of the collision. They should be also sensitive to the
number of resonances at chamical freez-out. Preliminary experimental
data obtaind by NA49 on charge fluctuations in central Pb+Pb collisions
at 40, 80 and 158 AGeV will be shown. The results will be discussed in
the framework of serveral models in which the effects of global charge
conservation, resonances decay kinematics and QGP formation are studied.
HK 41.5 Thu 15:15 E
Event-by-Event Fluctuations at 40, 80 and 158 AGeV/c in
Pb+Au Collisions from CERES/NA45 — •Hiroyuki Sako and
Harald Appelshäuser —GSI,Darmstadt
Event-by-event fluctuations have been proposed as probes to search
for the QCD critical point and deconfined phase.
We present fluctuations of mean pT and charge multiplicity ratios at
40, 80, and 158 AGeV/c in Pb+Au Collisions. We also compare them
with other experimental data and with theoretical expectations.
Time: Thursday 14:00–15:30 Room: F
Group Report HK 42.1 Thu 14:00 F
The AGOR facility — •S. Brandenburg, W. van Asselt, J.P.M.
Beijers, H.R. Kremers, T. Nijboer, H. Post, and S . van
der Veen — Kernfysisch Versneller Instituut, 9747 AA Groningen, the
Netherlands
The heart of the AGOR facility at the KVI is a superconducting cyclotron,
constructed by a collaboration of the KVI and the IPN, Orsay,
France. The facility is operational since 1997 for some 4500 hours per
year. The cyclotron can accelerate both light and heavy ions (e.g. protons
up to 190 MeV, lead down to 6 MeV/nucleon). It is equipped with
ion sources for polarized hydrogen, light and heavy ions.
The basic characteristics and performance of the facility will be described.
The design issues related to the wide range of ions and energies
will be discussed. Furthermore attention will be given to new developments,
such as the acceleration of low-intensity triton beams.
HK 42.2 Thu 14:30 F
New Developments in Cryo Targets for the External COSY Experiments
— •S. Abdel-Samad, M. Abdel-Bary, andK. Kilian
for the COSY-TOF collaboration — Forschungszentrum Juelich
For pp and pd interaction studies at COSY a very light cryo target
has been developed. The target thickness in beam direction defines the
interaction probability and thus the statistical precision. However all
material which can be hit by particles from the reaction under study
will produce secondary scattering and unwanted background. Therefore
already the target thickness has to be kept short. Much more important
is to keep the transversal size of the target very small and the heat conductors,
mounting elements and thermal isolation as light as possible.
The Juelich cryo targets have been optimized over some years in this
aspect. A drastic reduction of the total mass of the target arrangement
was achieved by using very thin walled, small diameter heat pipes, by
using aluminum for condensers, by target cells of galvanically deposited
copper and by 0.9 µm Mylar windows. Up to 2 meter long heat pipes
are operational. For bubble free operation a temperature stability with
< 0.2 K fluctuation has to be achieved. Details of the targets will be
shown.
HK 42.3 Thu 14:45 F
A Silicon Tracking Telescope for Spectator Proton Detection
— •A. Mussgiller 1 , G. Fiori 1 , T. Krings 1 , S. Merzliakov 2 ,
D. Protic 1 , and R. Schleichert 1 for the ANKE collaboration —
1 Institut für Kernphysik, Forschungszentrum Jülich — 2 Laboratory of
Nuclear Problems, JINR, Dubna, Russia
The identification and tracking of low energy protons enables the use of
deuterons as an effective neutron target. For this purpose a self-triggering
tracking telescope has been developed. The telescope consists of three
layers of double-sided silicon strip detectors mounted inside the COSY
vacuum. The setup allows the identification of protons from 1.5 MeVto
40 MeV via the ∆E/E method and particle tracking over a wide range
from 1.5 MeV protons to minimum ionizing particles. Results of the first
measurements will be presented.
HK 42.4 Thu 15:00 F
Nuclear Polarization of Molecular Hydrogen — •F. Rathmann 1 ,
J.T. Balewski 2 , J. Doskow 2 , W. Haeberli 3 , B. Lorentz 1 , H.O.
Meyer 2 , P.V. Pancella 4 , R.E. Pollock 2 , B. v. Przewoski 2 ,
P.A. Quin 3 , T. Rinckel 2 , Swapan K. Saha 5 , B. Schwartz 3 , T.G.
Walker 3 , A. Wellinghausen 2 ,andT. Wise 3 — 1 IKP, FZJ, Jülich,
Germany — 2 IUCF, Bloomington, USA — 3 Dep. of Physics, University
of Wisconsin-Madison, USA — 4 Western Michigan University, Kalamazoo,
USA — 5 Bose Institute, Calcutta, India
We have measured the nuclear polarization of hydrogen molecules
formed by recombination of polarized atomic hydrogen gas [1]. A polarized
atomic hydrogen beam is incident upon a copper recombination
zone and subsequently drifts into an internal target located in a straight
section of the IUCF Cooler ring. The target contains an internal valve
that allows us to rapidly alternate between a mostly atomic and a mostly
molecular target. A comparison of the target polarization for these two
states can be used to determine the fraction of the initial atom polarization
that survives recombination and subsequent wall collisions in the
target. That fraction was studied for temperatures between 50 K and
300 K and for applied magnetic fields between 0.5 mT and 0.6 T. The
target polarization was measured with a 200 MeV longitudinally polarized
proton beam using the known [2] large pp elastic spin correlation
coefficient Azz. The apparatus, measurement methods, results and inter-

Nuclear Physics Thursday
pretation will be descussed.
[1] T. Wise et al., Phys. Rev. Lett. 87, 042701 (2001).
[2] B. Lorentz et al., Phys. Rec. C 61 54002(2000).
HK 42.5 Thu 15:15 F
A Lamb-shift Polarimeter for the Polarized Gas Target at
ANKE/COSY — •Ralf Engels 1 , Reinhard Emmerich 1 , Jürgen
Ley 1 , Hans Paetz gen. Schieck 1 , Maxim Mikirtytchiants 2,3 ,
Frank Rathmann 2 , Hellmut Seyfarth 2 ,andAlexandre Vassiliev
3 — 1 Institut für Kernphysik der Universität zu Köln, Zülpicher
Str.77, 50937 Köln — 2 Institut für Kernphysik, FZ Jülich, Leo-Brandt-
Str., 52425 Jülich — 3 High Energy Physics Dept., St. Petersburg Nucl.
Phys. Inst., 188350 Gatchina, Russia
With a Lamb-shift polarimeter it is possible to measure the occupation
HK43 Theory VII
numbers of the individual hyperfine substates in a beam of hydrogen or
deuterium atoms. Therefore one can calculate the nuclear polarization of
the atomic beam in magnetic fields of varying strength. The polarization
of a slow (500-2000 eV) ion beam can be measured as well.
The modular components of the polarimeter consisting of a Glavishtype
ionizer, a Wienfilter, a Cs cell, a spinfilter, and a quenching region
were designed, produced and then tested at the Universität zu Köln with
an unpolarized (horizontal) ion beam. At the Forschungszentrum Jülich
the tests were completed by measuring the necessary correction factors
and the polarization of the vertical atomic beam of the source for the
polarized gas target at ANKE/COSY with a 90˚ deflector behind the
ionizer. First results obtained with a polarized hydrogen and deuterium
beam are presented. Planned studies to investigate the polarization of
the gas in storage cells are discussed as well.
Time: Thursday 16:00–18:00 Room: A
Group Report HK 43.1 Thu 16:00 A
Two-pion production on the nucleon — •Sonja Schneider,
Siegfried Krewald, andJosef Speth — Institut für Kernphysik,
FZ Jülich
We developed a meson-theoretical model for the pion-induced two-pion
production on the nucleon. In a first step, our model was formulated
strictly at the tree level. Accounting for ππ final state interaction, the
exchange of a σ- oraρ-meson was replaced by the exchange of correlated
two-pion states. With this second version we already achieved a good
description of the data except for the ∆33-dominated π + p → π + π + n and
π + p → π + π 0 p channels. In a third step, a simple treatment of threebody
unitarity has to be implemented, accounting in particular for the
unitarization of the πN P33 partial wave.
Group Report HK 43.2 Thu 16:30 A
The baryon spectrum in a covariant quark model with
instanton-induced forces — •Ulrich Löring, Dirk Merten,
Bernard Metsch, Herbert-R. Petry, andChristian Haupt —
Institut für Theoretische Kernphysik, Univerität Bonn, Nußallee 14-16,
53115 Bonn
On the basis of the Bethe-Salpeter equation in instantaneous approximation
we formulated a relativistic quark model for baryons. Motivated
by the success of the non-relativistic quark model, the full quark propagators
are replaced by their free forms with constituent quark masses,
and the interactions of the quarks are described by unretarded, static potentials.
To generate the hyperfine structure of the baryon spectrum we
adopt ’t Hooft’s force which is derived from QCD-instanton-effects. This
relativistic model allows a very successful description of the complete
baryon spectrum up to 3 GeV with spins up to J =15/2. In particular
several prominent features such as the linear Regge-trajectories, the low
position of the Roper resonance (and its strange counterparts) as well
as the striking phenomenon of approximate parity doublets can be uniformly
explained. In this respect the specific role of instanton-effects is
discussed, and we demonstrate that the alternative one-gluon-exchange,
however, is not able to reproduce the excited baryon spectrum correctly.
HK 43.3 Thu 17:00 A
Relativistic Mean Field Theory with Generalized Nucleon-
Meson Couplings — •Stefan Typel 1 und Hermann Wolter 2 —
1 NSCL/Michigan State University, USA — 2 University of Munich, Ger-
many
Nuclear matter and finite nuclei can be qualitatively well described in
quantum hadrodynamics (QHD) with constant meson-nucleon couplings
in the mean field approximation. For a quantitative description an effective
medium dependence has to be introduced, e.g. by assuming nonlinear
meson self-couplings or a density dependence of the nucleon-meson couplings.
From Dirac-Brueckner theory of nuclear matter it is well known
on the other hand that the nuclear self energies are both density and
momentum dependent. The momentum dependence is essential for a
description of elastic proton-nucleus scattering. We therefore introduce
generalized nucleon-mesons couplings in the QHD-Lagrangian which lead
to density and momentum dependent self energies. Two models are considered.
In the first model we investigate couplings of the mesons fields
to derivatives of the nucleon field. This leads to new source terms in the
field equations of the mesons and density-dependent meson masses. In
the second model the meson-nucleon couplings are assumed to be functions
of derivative densities generating rearrangement contributions in the
self-energies. We suggest parametrizations of the generalized couplings
and study their effect on the equation of state of nuclear matter and the
energy dependence of the Schrödinger equivalent optical potential.
HK 43.4 Thu 17:15 A
Short-ranged Central and Tensor Correlations in the Nuclear
Many-Body System — •Thomas Neff, Hans Feldmeier, and
Robert Roth — Gesellschaft für Schwerionenforschung, Darmstadt
Realistisc nucleon-nucleon interactions have a strong repulsive core and
a strong tensor force. We introduce a unitary correlation operator that
takes care of the short-ranged central and tensor correlations induced by
the nuclear force. This unitary correlation operator allows us to perform
ab initio calculations of nuclei up to A ≈ 50 in a mean-field or
shell model many-body approach. The unitary correlation operator is
the product of a central correlation operator that performs radial shifts
in the two-body density and a tensor correlation operator that aligns the
two-body density with the total spin of two nucleons. An effective interaction
can be defined by correlating the bare nuclear interaction. The
unitary correlation operator method provides a method to extract the
common low-energy behavior of realistic nuclear interactions.
HK 43.5 Thu 17:30 A
Nucleon-Nucleon potential from two body Dirac equations at
medium energies — •Davaadorj Bayansan 1 , Andreas Funk 1 ,
Bin Liu 2 , Horace W. Crater 2 , Heinrich V. von Geramb 1 ,and
Hugo Arellano 3 — 1 Nuclear Theory , University Hamburg — 2 Space
Institute, University Tennessee, Tullahoma — 3 Fisica, Universidad de
Chile, Santiago
We investigate the implication and use of Dirac’s instant form dynamics
in applications of two-body Dirac equations. First, it yields a center
of momentum reduction of the two-body Dirac equations to Schrödingerlike
equations with effective energy dependent potentials. Second, a link
to known and optimally fitted NN potentials (Nijmegen,AV18) as well as
quantum inversion potentials is made. Third, the effective potentials are
extented, above meson production threshold, as NN optical potentials.
The latest NN phase shifts up to 3 GeV are fitted. Some application of
the resulting NN potentials in medium energy nucleon-nucleus scattering,
formulated in terms of NA full folding optical models, are also shown.
HK 43.6 Thu 17:45 A
Production of the f0(980) in the reaction π − p → π 0 π 0 n — •Felix
Sassen, Siegfried Krewald, andJosef Speth — Forschungszentrum
Jülich, IKP (Th), D-52425 Jülich
Lately the E852-Collaboration at Brookhaven published data on pion
production in the charge exchange reaction π − p → π 0 π 0 n. [1] The published
S-wave mass spectrum taken at low momentum transfer t to the
nucleon shows a sharp dip at mππ ≈ 1 GeV where as the same spectrum
taken at high t exhibits a sharp peak at the same position.
This behaviour sheded some doubt on the interpretation of the f0(980)
as a K ¯ K molecule.[2] We show using a model with two production mechanisms
(π- anda1-exchange) that the above experimental results do not
oppose the K ¯ K interpretation of the f0(980). In our model the final state

Nuclear Physics Thursday
interaction between the outgoing pions is generated using the Jülich meson
exchange model with dispersion theoratical form factors for t-channel
exchanges.
HK44 Theory VIII
[1] J.Gunter et al., Phys.Rev.D 64,072003(2001)
[2] V.V.Anisovich et al., Phys.Lett.B 355,363 (1995)
Time: Thursday 16:00–18:00 Room: C
Group Report HK 44.1 Thu 16:00 C
Self-consistent many-body approach and properties of neutron
star matter — •Tobias Frick, Khalaf Gad, Jan Kuckei, Fernando
Montani, andHerbert Müther — Institut für theoretische
Physik der Universität Tübingen
Within a Green’s functions approach, the neutron and the proton properties
are studied in asymmetric nuclear matter, starting from realistic
NN potentials. Going beyond a quasi-particle approximation, we account
for the depletion of the hole states in the many-body system by
introducing multiple poles in the two-particle propagator that appears in
the ladder-equation for the effective interaction, each of them carrying a
strength that is deduced from the nuclear single-particle spectral functions.
The nuclear self-energies are calculated within different approximations,
treating the backward-propagation of intermediate two-holeone-particle
configurations perturbatively, but also in a non-perturbative
Galitsii-Feynman approach. Due to a non-vanishing spectral distribution
of the single-particle strength for momenta very close to the Fermi
surface, a gap is introduced in the single-particle spectrum. In a natural
way, this leads to a supression of the well-known pairing instability. The
results of this Green’s function approach for the equation of state are
compared to corresponding predicitions of the conventional Brueckner-
Hartree-Fock approach. Furthermore we present the predicitions for the
spectral function and momentum distribution. The sensitivity of theses
on the NN interaction is discussed.
Group Report HK 44.2 Thu 16:30 C
Energy dependence of QCD cross sections: Saturation effects
from HERA to RHIC and LHC — •Heribert Weigert 1 ,
Kari Rummukainen 2 , Andreas Schäfer 1 ,andRainer Fries 1 —
1 Universität Regensburg — 2 Nordita, Kopenhagen
Gluon evolution enhances the importance of multiple interaction effects
in eA and AA collisions at high energies. These mimic properties
such as screening and saturation in ways otherwise only known from
dense media. They are responsible for the unitarization of cross sections,
the infrared safety of properly resummed perturbation theory and allow
us to calculate the energy dependence of various cross sections semiperturbatively.
I will try to highlight the key ingredients to the underlying
physical picture and the ensuing technology (a renormalization group
w.r.t. xBj) and its conceptual relevance to HERA, eRHIC, RHIC and
LHC experiments.
HK 44.3 Thu 17:00 C
Energy loss of high pt hadrons by final hadronic state in ultrarelativistic
heavy ion collisions — •Kai Gallmeister, Carsten
Greiner, Gunnar Martens, andZhe Xu — Institut für Theoretische
Physik, Universität Gießen, Germany
When discussing the parton jet quenching phenomena in ultrarelativistic
heavy ion collisions typically hadronization is assumed to take place
in vacuum outside the reaction zone. On the other hand simple quantum
mechanical estimates give a hadronization time τh ≈ E/GeV ∗ fm.For
pt ≤ 10 GeV hadronization thus might well take place inside the fireball.
Typical (in-)elastic collisions of these high pt particles with the dominant
low momentum hadrons of the fireball have √ s ≤ 4 GeV and are
thus soft and nonperturbative. The mean free path in the late hadronic
stage is estimated to be λ ≈ 1 − 5 fm, resulting in in a few collisions
L/λ =0, 1, 2,.... An analysis within this opacity expansion by means
of the FRITIOF collisions scheme for various hadrons will be presented
and it shows that these collisions can account for the modification of the
pt-spectrum observed for central collisions at RHIC.
Work supproted by BMBF.
HK 44.4 Thu 17:15 C
Dispersion Effects in Nucleon Polarisabilities — •Robert Hildebrandt,
Harald Griesshammer, andThomas Hemmert —Institute
for Theoretical Physics (T39), TU Muenchen, Germany
The dynamical nucleon polarisabilities can be defined via a multipole
expansion of the structure amplitudes in nucleon Compton scattering [1].
In contradistinction to the static polarisabilities, dynamical polarisabilities
gauge the response of the internal degrees of freedom of a nucleon
to an external, real photon field of arbitrary energy but definite multipolarity.
Being energy dependent, they therefore contain additional information
about dispersive effects induced by internal relaxation, baryon
resonances or meson production thresholds of the nucleon.
We present the different diagrams contributing in leading order ChPT —
i. e. on the one pion loop level — in theories with and without explicit
∆(1232) degrees of freedom [2]. We further compare our results with
a dispersion relation analysis. Once two counter terms are fixed at the
static values, we obtain excellent predictions even well above the pion
mass.
Work supported in part by DFG and BMBF.
1) H. Grießhammer, T. Hemmert: nucl-th/0110006
2) T. R. Hemmert, H. W. Griesshammer, R. P. Hildebrandt: in preparation
HK 44.5 Thu 17:30 C
Hadron formation in high energy photonuclear reactions —
•Thomas Falter and Ulrich Mosel — Institut für Theoretische
Physik, Universität Gießen, Germany
Photo- and electroproduction on nuclei offer a great opportunity to investigate
the physics of hadron formation. The results are usually interpreted
using simple Glauber theory to describe the final state interactions
(FSI) of the produced particles. We show that this purely absorptive
treatment of the FSI might lead to wrong estimates of formation time
and color transparency effects. We use a semi-classical transport model
based on the BUU equation which allows for a realistic coupled channel
description of the FSI that goes far beyond simple Glauber theory. The
model has already been successfully used to describe heavy ion collisions,
pion and proton induced reactions as well as photon and electron induced
reactions in the resonance region. We present a possibility to account for
coherence length effects within this model, which makes it possible to
describe photo- and electroproduction at higher energies. As an example
we will discuss inclusive and exclusive meson photoproduction in the
energy range from 1 to 7 GeV.
Work supported by DFG.
HK 44.6 Thu 17:45 C
PP bremsstrahlung and low energy NN interaction — •Mircea
Dan Cozma 1 , Olaf Scholten 1 , John Tjon 1,2 ,andRob Timmermans
1 — 1 KVI, Zernikelaan 27, 9747 AA Groningen, The Netherlands
— 2 ITP, Utrecht, The Netherlands
For the study of bremsstrahlung several microscopic models have been
developed. Despite of the richness of included physics, these models are
posed with problems; predictions differ substantially from experiment
in some kinematical regions. It appears that this is mainly due to the
high sensitivity of the bremsstrahlung process with respect to the NN
interaction at low energies.
The high accuracy KVI bremsstrahlung experiments showed that microscopical
bremsstrahlung models using np potentials were observed to
fail describing the data in the above mentioned way. We will consider
a field theoretical model of the NN interaction in the 1 S0 channel which
also takes into account the Coulomb interaction. This model is then incorporated
in a field theoretical toy model for bremsstrahlung. Phase
shifts of the NN toy model are in good agreement with the experimental
pp phase shift in the low energy region.
We end by presenting a fit of the NN potential of Fleischer and Tjon
to the experimental pp phase shifts. Bremsstrahlung is then computed
within the microscopic model of Martinus et al.. Although they are reduced,
the discrepancies are still present.

Nuclear Physics Thursday
HK45 Nuclear Physics / Spectroscopy VII
Time: Thursday 16:00–18:00 Room: B
Group Report HK 45.1 Thu 16:00 B
β-decay studies of exotic nuclei and states close to 100 Sn : 94 Ag
and 100 In — •C. Plettner for the GSI-ISOL collaboration — GSI,
Darmstadt, Germany
Nuclei along the N=Z line up to the doubly-magic 100 Sn have been
subject to extensive experimental studies both in β decay and in-beam
experiments. In various theoretical approaches the proton-neutron (πν)
interaction in identical orbits has been addressed, which gives rise to
a new S=1 pairing mode and, in stretched configurations, to spin-gap
isomers. The interplay of mean field (single-particle energies), residual
πν-interaction (empirical vs. realistic) and model space (core excitation)
will be demonstrated for two key examples: • 94 Ag is the heaviest N=Z
nucleus studied in detailed β-decay spectroscopy. It exhibits three β-
decay parent states, namely the T=1, I π =0 + , T1/2 =29± 29
10 ms ground
state [1], a T=0, I π =(7 + ), T1/2 =0.36 ± 3 s isomer and a T1/2 =0.3 ± 2
s, I > 15 high-spin isomer. The latter is suspect to establish records
both in spin (I π =21 + ) and excitation energy Ex > 6 MeV among the
known part of the Segré chart. • 100 In is the closest neighbour to 100 Sn
studied both in high-resolution and total absorption spectroscopy. Spin
I π =7 + and T1/2 =6.2 ± 4 s were determined for its ground state, which
is at variance with various shell model predictions.
[1] A. Stolz et al., Proc. PINGST 2000, Selected Topics on N=Z Nuclei,
eds. D. Rudolph, M. Hellström, Lund, Sweden, LUIP003, Bloms i Lund,
2000, p.113
Group Report HK 45.2 Thu 16:30 B
Shape coexistence in the Pb region — •kris heyde1 , ruben
fossion1 ,andjose-enrique garcia-ramos2 — 1Department of subatomic
and radiation physics, University of Gent, Proeftuinstraat,86 B-
9000 Gent (Belgium) — 2Departamento de Fisica Aplicada. EPSLa
Rabida, Universidad de Huelvam 21819 Palos de la Frontera, Spain
The Pb region has formed a most interesting testing region and in recent
experiments (in-beam work, beta-decay, alpha-decay,..) using stateof-the
art techniques, evidence has resulted for the coexistence of both
spherical, oblate and prolate structures. The data basis at present encompasses
both the region near the doubly-closed shell Z=82,N=126, the
neutron-deficient region spanning all the way down to neutron mid-shell
N=104 and also, presently, is bringing in results on the heaviest Pb nuclei
( beyond N=126).
Using both algebraic methods in which multi-particle multi-hole excitations
across the Z=82 shell are treated as extra pairs, as well as using
deformed mean-field calculations, a comprehensive set of results is obtained.
Thereby we accentuate both the symmetry aspects that govern
the interacting boson model algebraic structures as well as the shape
degrees of freedom that become active in these single-closed shell nuclei.
We shall higlight both the extensive data basis as well as the recent
theoretical results.
HK 45.3 Thu 17:00 B
Spin-Orientation in a projectile-fragmentation reaction —
•dana borremans1 , Gerda Neyens1 , Dimiter Balabanski1 ,
Nico Coulier1 , Jean-Michel Daugas1 , Francois de Oliveira2 ,
Georgi Georgiev1,2 , Marek Lewitowitz2 , Oscar Navilliat
Cuncic3 , Iolanda Matea2 , Mihai Stanoiu2 , Stephanie
Teughels1 , and Katrien Vyvey1 — 1Celestijnenlaan 200D,
3001Heverlee,Belgium — 2GANIL, Caen,France — 3LPC, Caen, France
To measure nuclear moments of short-lived nuclei, we need often an
initially oriented ensemble of nuclear spins. This orientation can be the
result of nuclear reactions. For the production of exotic nuclei, we use
a projectile-fragmentation reaction. It has been shown that nuclei produced
in such reaction are spin-oriented [1-4], but the spin orientation
mechanism is not yet completely understood. At GANIL we studied the
orientation in a projectile-fragmentation reaction using β-Level Mixing
techniques [5]. In this talk the idea behind the measurement of spinorientation
and the orientation mechanism will be explained, concluding
with some results.
[1] W.D.Schmidt-Ott et al., Z. Phys. A350 (1994) 215
[2] K.Asahi et al., Phys Lett. B 251 (1990) 488
[3] K.Asahi et al., Phys.Rev. C 43 (1991) 456
[4] G.Neyens et al., Phys.Lett. B393 (1997) 36
[5] G.Neyens et al., Phys. Res. A340 (1994) 555
*D.B.is an assistant researcher,G.N. a post-doctoral researcher of
FWO-Vlaanderen.
HK 45.4 Thu 17:15 B
γ-Spectroscopy of 40 Ca and 42 Ca — •S . Torilov 1 , S. Thummerer
1 , W. von Oertzen 1 , B. Gebauer 1 , H.G. Bohlen 1 , Tz.
Kokalova 1 , A. Tumino 1 , G. de Angelis 2 , M. Axiotis 2 , A.
Gadea 2 , E. Farnea 2 , N. Marginean 2 , T. Martinez 2 , D.R.
Napoli 2 , M. De Poli 2 , S.M. Lenzi 3 , C. Ur 3 , C. Beck 4 , M.
Rousseau 4 , and P. Papka 4 — 1 Hahn-Meitner-Institut Berlin —
2 INFN, Laboratori Nazionali di Legnaro — 3 Dipartimento di Fisica and
INFN, Padova — 4 Institut de Recherches Subatomiques
In the present work high-lying levels of two even isotopes of Ca were
studied using particle-γ coincidence. To select the reaction channels for
γ-spectroscopy the Si-ball ISIS has been used in combination with the
GASP γ-detector array at LNL Legnaro.
From this experiment 19 new levels and 25 new transitions for 40 Ca
for excitation energies up to 21 MeV and 5 new levels and 5 new transitions
for 42 Ca up to 13 MeV were found. The present data show in 40 Ca
clearly sperarated rotational bands with a 4p-4h and 8p-8h structure and
a mixture of different structures in the yrast line.
For 42 Ca some very good candidates were found for the 12 + state of
the 6p-4h band.
HK 45.5 Thu 17:30 B
Structure of excited K π =0 + bands in 168 Er. — •A. Linnemann
1 , J. Jolie 1 , H.G. Börner 2 , M. Jentschel 2 ,andP. Mutti 2
— 1 Institut für Kernphysik, Universität zu Köln — 2 Institut Laue-
Langevin,38042 Grenoble, France
In order to investigate the character of excited K π =0 + bands, that
can be interpreted as β- orγγ-bands, the knowledge of absolute decay
rates is mandatory. We have studied the second excited K π =0 + band
in 168 Er using neutron capture on 167 Er and the γ-ray-induced Dopplerboardening
technique (GRID) to measure the lifetimes. The experiment
was performed at the double-flat-crystal spectrometer GAMS4 installed
at the Laue-Langevin (ILL) in Grenoble. The lifetimes of the 2 + 4 state
at 1493 keV and the 4 + 4 state at 1656 keV could be measured for the
first time. The collectivity of this band can be studied using the absolute
transition rates.
HK 45.6 Thu 17:45 B
Bremsstrahlung emission in the α decay of 210 Po — •Hans Boie,
Jörg Fitting, Frank Köck, Martin Lauer, Heiko Scheit, and
Dirk Schwalm —MPIfür Kernphysik, Heidelberg
The emission of bremsstrahlung is usually well described by a semiclassical
treatment. However, in an α decay the α particle is tunneling
through the Coulomb barrier of the nucleus, a process which can only be
understood quantum-mechanically. The question that arises is: How is
the bremsstrahlung emission influenced by the tunneling process?
A typical emission probability of bremsstrahlung in the α decay
of 210 Po in the interesting Eγ region (∼400 keV) is about 10 −12
keV −1 decay −1 . Recent measurements [1] show that the simple Coulomb
acceleration model overestimates the data by more than an order of
magnitude. Several theoretical treatments of the problem have been
published (e.g. [2]). Due to poor statistics the data available so far does
not allow to distinguish between these models. In addition, the results
of [1] are in disagreement with a previous measurement.
To clarify the situation and to provide high statistics data an experiment
is presently being performed at the MPI-K Heidelberg, where the
bremsstrahlung γ rays and the coincident α particles are detected by a
cluster of three sixfold segmented HPGe detectors (of MINIBALL type
[3]) and two silicon strip detectors, respectively. The experimental setup
and preliminary results will be presented.
[1]J.Kasagiet.al.,Phys.Rev.Lett.79, 371 (1997).
[2] T. Papenbrock and G. F. Bertsch, Phys. Rev. Lett. 80, 4141 (1998).
[3] J. Eberth et. al., Prog. Part. Nucl. Phys. 46, 389 (2001).

Nuclear Physics Thursday
HK46 Electromagnetic and Hadronic Probes VI
Time: Thursday 16:00–18:00 Room: D
Group Report HK 46.1 Thu 16:00 D
Exclusive Measurements of the Two-Pion Production
in Proton-Proton Collis ions ∗ — •J. Kress, J. Pätzold, H.
Clement, E. Dorochkevitch, A. Erhardt, G.J. Wagner, andU.
Weidlich for the COSY-TOF collaboration and the PROMICE/WASA
collaboration — Physikalisches Institut der Universität Tübingen
After installation and commissioning of the central calorimeter at
COSY-TOF runs at Tp = 750 MeV and 800 MeV have been carried out
with polarized beam to study the reaction �pp → ppπ + π − over a large
solid angle. Deuterons, protons and pions emerging from the pp collision
in the LH2 target are identified by the ∆E − E method, π + particles in
addition by the recently installed delayed pulse technique. The status
of the data analysis of these runs is presented. Data taken previously
with the PROMICE/WASA detector at CELSIUS in the energy range
Tp = 650-775 MeV have now been fully analyzed. The final results are
discussed. Besides of the exclusive data for the ppπ + π − channel also
integral cross sections for the channels ppπ 0 π 0 and pnπ + π 0 have been
obtained. The exclusive data show that the pp → ppπ + π − reaction at
these energies proceeds via σ exchange and subsequent excitation of
the Roper resonance. Its decay into Nππ is observed to be practically
exclusively into (ππ)I=l=0 pairs, either directly by N ∗ → Nσ or via
N ∗ → ∆π.
∗supported by BMBF (06 TÜ 987) and DFG (European Graduate
School)
Group Report HK 46.2 Thu 16:30 D
Measurement of hadronic cross sections with the KLOE experiment
in Frascati — •Stefan E. Müller for the KLOE collaboration
— Institut für Exp. Kernphysik Universität Karlsruhe, Postfach 3640,
76021 Karlsruhe
The KLOE experiment at the Frascati e + e − collider DAΦNE working
at the φ(1.02 GeV) resonance started data taking in 1999. Although optimized
to study neutral kaons, the KLOE detector is suited to cover a
much wider field of physics. Especially appealing is the measurement of
hadronic cross sections from 1.02 GeV down to the two pion threshold.
The precise determination of these cross sections can be used to lower the
uncertainty of the theoretical calculations for the hadronic contribution
to the muon’s anomalous magnetic moment. Since DAΦNE is working
at a fixed energy, the measurement is done by selecting events where the
e + or the e − emits a hard photon. In this way the collision energy of the
electron and the positron is lowered. The method of the measurement
is presented in detail and first results for σ(e + e − → π + π − )areshown.
In addition further recent results from the KLOE physics program are
presented.
HK 46.3 Thu 17:00 D
ω-Production on a Neutron Target at ANKE — •I. Lehmann 1
and S . Barsov 2 for the ANKE collaboration — 1 Forschungszentrum
Jülich — 2 PNPI, Gatchina
In August 2001 a test beam time to investigate the reaction: pd →
pspdω took place at ANKE/COSY. It could be shown, that the slow
spectator proton (Tkin =2.5 − 30 MeV) can be identified simultaneously
with the fast deuteron (p ≈ 2 GeV/c) in the detection systems of ANKE.
The former is detected in a near-target-silicon telescope and the latter is
identified using the momentum resolution of the magnetic spectrometer
together with energy losses in two layers of scintillators and the response
from inclined Čerenkov counters.
In the talk the methods to determine the ω-cross section from a missing
mass spectrum with large background from multi-pion and ρ-production
will be discussed and preliminary results will be presented.
HK 46.4 Thu 17:15 D
Pion-Proton-Scattering at Low Energies — •Holger Denz,
Johannes Breitschopf, Heinz Clement, Margit Cröni,
Arthur Erhardt, Rudolf Meier, Jens Pätzold, Florian von
Wrochem, andGerhard J. Wagner for the CHAOScollaboration
and the LEPScollaboration — Universität Tübingen, Physikalisches
Institut, Auf der Morgenstelle 14, 72076 Tübingen, Germany
From πp observables, important quantities of the strong interaction
can be extracted: the πNN coupling constant, the πN sigma-termand
the size of isospin symmetry violation. Presently, there is no agreement
on the value of any of these quantities. This is partly due to the unsatisfactory
status of the πp data base, in particular at low energies. New
measurements of πp observables at low energies are aimed at providing
additional information and resolving discrepancies. Elastic scattering
cross sections have been measured with the CHAOSdetector at TRI-
UMF for several pion energies down to 15 MeV. A large angular range
has been covered with special emphasis on forward angle measurements
in the Coulomb-nuclear interference region. Elastic scattering polarization
observables have been measured, both with the CHAOSdetector
and, at PSI, with the LEPS spectrometer and an active polarized target.
An experiment measuring the π − p→ π ◦ n total cross section from
30 to 250 MeV using a transmission technique has started taking data
at PSI. Status and/or results of these experiments will be discussed.
This work is supported by BMBF (06Tü987I) and DFG (Europäisches
Graduiertenkolleg Basel-Tübingen).
HK 46.5 Thu 17:30 D
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 , P. Jesinger 1 , R. Meier 1 ,andG. J. Wagner 1 —
1 Physikalisches Institut, Universität Tübingen — 2 Racah Institute of
Physics, The Hebrew University, Jerusalem, Israel
The mass difference of up- and down-quarks is the origin of isospin
violation in the strong interaction. Isospin breaking can in principle be
tested in a number of ways in the pion-nucleon system. Currently experimentally
accessible is the comparison of elastic scattering of positively
and negatively charged pions from protons with the charge exchange
reaction π − p → π 0 n (SCX). Analyses of this system, based on the existing
scattering data base, found unexpectedly large isospin breaking in
s-waves for pion energies below 100 MeV. These analyses probably are
not suffficiently restricted by the low amount of SCX data. Therefore,
further measurements of SCX cross sections and analyzing powers are
needed to test this result.
A measurement of the SCX total cross section in the energy region from
30 to 250 MeV has been started at PSI. The experiment employs a transmission
technique using a 4π box detector consisting of thin plastic scintillators.
A first beam time covered the high energy part from 60 to
250 MeV, a second beam time in 2002 will take data from 30 to 90 MeV.
The measuring procedure and the status of the experiment are discussed.
This work is supported by BMBF (06Tü987I) and DFG (Europäisches
Graduiertenkolleg Basel-Tübingen).
HK 46.6 Thu 17:45 D
Investigation of the a + 0 (980) Resonance at ANKE — •V. Kleber
for the ANKE collaboration — Institut für Kernphysik, Forschungszentrum
Jülich, 52425 Jülich
In a recent ANKE beam time at COSY Jülich a first experiment on
the production of scalar mesons in pp collisions was performed. The goal
of this experiment is to investigate the a + 0 (980) resonance, a candidate
for the scalar meson nonet, in the reaction pp → da + 0 .
The a0(980) is known to decay in KK, πη and 2γ. At ANKE the
deuteron and the decay K + or π + are detected. The mesons are identified
by TOF and energy loss, the coincident deuterons by their TOF
relative to the mesons. Subsequently the a + 0 (980) is investigated with a
missing mass analysis.
In case of a K + and a deuteron a clean sample of dK + K 0 events is obtained
due to energy and strangeness conservation. In the missing mass
distribution m(pp,d) a narrow structure is observed mainly given by the
KK production threshold (mmin=991 MeV) and the COSY beam energy
of T=2.65 GeV (mmax=1038 MeV).
In the missing mass distribution m(pp,dπ + ) a clear peak from η mesons
on a broad background is seen as well as a shoulder in the distribution
m(pp,d) at the a0(980) mass which reveals a peak structure after background
subtraction.

Nuclear Physics Thursday
HK47 Heavy Ions VI
Time: Thursday 16:00–18:00 Room: E
Group Report HK 47.1 Thu 16:00 E
Investigation of nuclear structure of light nuclei far from the
stability line — •Haik Simon for the FRS/LAND collaboration and
the ISOLDE collaboration — Institut für Kernphysik, Technische Universität
Darmstadt
The study of exotic nuclei – far from the valley of β-stability – has
become one of the main topics in modern nuclear structure physics. Results
of experimental investigations probing the single particle and cluster
structure of light exotic nuclei are presented and consequences for
nuclear models are drawn. Selected examples of experiments performed
at GSI with relativistic secondary beams with energies between 0.2-1.5
GeV/nucleon are given, where cross sections, momentum distributions,
angular and energy correlations after break-up reactions have been measured.
Momentum distributions of the charged fragments, especially in
coincidence with γ radiation that is emitted if a substantial core polarisation
is present, provide first information about the single particle
structure of the reacting projectiles whereas detailed spectroscopic information
for the ground state and continuum structure of projectiles and
intermediate, unbound systems in the decay channels can be obtained
using fragment-neutron correlation measurements in addition. Experiments
performed at ISOLDE/CERN investigating the decay probabilities
into states of the daughter nuclei with known structure represent a
different approach to determine the structure of the decaying systems.
This will be discussed for the bound systems 6,8 He, 11 Li, 14 Be, 8 Band
19 C as well as for the unbound systems 5,7 He, 10 Li and 13 Be.
Supported by BMBF (06DA915I) and GSI (DARIK).
Group Report HK 47.2 Thu 16:30 E
Au + Au collisions at 40 to 150 A MeV studied with INDRA —
•Jerzy Lukasik for the ALADIN-INDRA collaboration — GSI Darmstadt,
Planckstr. 1, D-64291 Darmstadt
The emission of intermediate-mass fragments in collisions of 197Au on
197Au has been systematically studied over the range of incident energies
from 40 to 150 A MeV using the 4π-multidetector INDRA and beams
from the heavy-ion synchrotron SIS at GSI. The analysis was performed
as a function of incident energy and of impact parameter, defined through
the total transverse energy of light charged particles (Z≤2).
In more peripheral collisions, strong forward-backward asymmetries in
the emission patterns with respect to the excited projectile and targetlike
fragments are observed and interpreted in the framework of statistical
multifragmentation and molecular dynamics models. The transversevelocity
spectra of intermediate mass fragments produced at mid-velocity
are found to show an intriguing invariance with respect to the incident
energy which may be related to the role of Pauli blocking.
In central collisions, the onset and rapid rise of collective radial flow has
been observed. The considerable anisotropies in the flow pattern along
the beam direction are interpreted within the statistical multifragmentation
model which has been modified to allow for source deformation and
collective motions.
HK 47.3 Thu 17:00 E
Low-Mass Lepton Pair Production in Pb-Au Collisions at 40
AGeV — •Sanja Damjanovic for the CERES/NA45 collaboration
— University Heidelberg, Germany, Philosophenweg 12, 69120
Low-Mass Lepton Pair Production in Pb-Au Collisions at 40 AGeV
Sanja Damjanovic for the CERES/NA45 Collaboration
The CERES/NA45 experiment at the CERN SPS has previously measured
e + e− pair production in 160 AGeV Pb-Au collisions. In the mass
region m>0.2 GeV/c2 , an enhancement of 2.7 ± 0.4(statist.) ± 0.5(syst.)
compared to the expectation from known hadronic decay sources was
observed. In the 40 AGeV data taken in 1999, an enhancement is
again found; a preliminary analysis gives the even larger value of
4.5 ± 1.2(statist.).The results are compared to theoretical model calculations
based on π + π − annihilation with a modified ρ-propagator.
HK 47.4 Thu 17:15 E
Pion production in Au-Au collisions at 1.5 AGeV — •Tanja
Schuck for the KaoScollaboration — GSI, Planckstr 1, 64291 Darmstadt
The production of pions is the dominant inelastic hadronic channel in
nuclear processes and hence influences significantly the reaction dynamics
of nucleus-nucleus collisions. However, a detailed and quantitative
understanding of pion creation and reabsorption in those collisions - in
particular in the resonance region - is still lacking.
Using the Kaon Spectrometer KaoS at SIS/GSI the phasespace distributions
of charged pions were measured in Au-Au collisions at a beam
energy of 1.5 AGeV. This is well above the threshold for the population
of hadronic resonances which contribute by their decay to the pion yield.
The experimental data will be discussed and compared to results of
calculations performed with the UrQMD transport code which aims to
include these decays.
HK 47.5 Thu 17:30 E
Isospin Dynamics in Nuclear Fragmentation — •Hermann
Wolter 1 , Virgil Baran 2 , Maria Colonna 3 , Massimo Di Toro 3 ,
and Malgorzata Zielinska-Pfabe 4 — 1 University of Munich,
Germany — 2 Nat. Inst. Phys. and Nucl. Eng., Bucharest, Romania —
3 LNSCatania, Italy — 4 Smith Coll., Mass, USA
The isospin dependence of the nuclear equation-of-state is still rather
unknown away from saturation density; however, it is important in the
structure of unstable nuclei and in astrophysical contexts. One way to
test it is in heavy ion collisions at high density (nuclear flow) and at low
density (in fragmentation processes). In this contribution we investigate
the second approach. Fragmentation reactions are seen as signatures
of chemical and mechanical instabilities and phase transitions in binary
proton-neutron systems, which are influenced significantly by the isospin
dependence of the eos. We investigate these phenomena in the framework
of transport calculations, where we follow in particular the isospin
dynamics, i.e. the evolution of the charge asymmetry of the fragments
(liquid) and the light particles (gas) in relation to the initial asymmetry.
Such processes have recently been studied experimentally and we make
first comparisons to data.
HK 47.6 Thu 17:45 E
Isoscaling in Light-Ion Induced Reactions and its Statistical
Interpretation — •Alexandre Botvina 1 , Oleg Lozhkin 2 , and
Wolfgang Trautmann 1 — 1 GSI, Planckstrasse 1, D-64291 Darmstadt
— 2 KRI, St.Petersburg, Russia
Isotopic effects observed in fragmentation reactions induced by protons,
deutrons and alpha-particles of incident energies between 0.66 and
15.3 GeV on 112-Sn and 124-Sn targets are discussed. The exponential
scaling of the yield ratios with the third component of the fragment
isospin (N-Z)/2 is observed in all reactions, with the scaling parameters
that depend on the incident energy. Breakup temperatures for these reactions
are deduced from double ratios of isotopic yields and tested for
their relation with the isoscaling parameters. The observed isoscaling
can be understood as a consequence of a statistical origin of the emitted
fragments in these reactions. The Statistical Multifragmentation Model
analysis shows that the exponent describing the isoscaling behavior is
proportional to the strength of the symmetry term of the fragment binding
energy. A symmetry-term coefficient around 22.5 MeV for fragments
at low density breakup stage is deduced from the experimental data, that
is slightly weaker than for isolated nuclei.

Nuclear Physics Thursday
HK48 Instrumentation and Applications VI
Time: Thursday 16:00–18:00 Room: F
Group Report HK 48.1 Thu 16:00 F
Investigaions of scintillation detectors for relativistic heavy ion
calorimetry — •Radomira Lozeva 1,2 , Jürgen Gerl 1 , Ivan Kojouharov
1 , Samit Mandal 1 ,andJuri Kopatch 1 — 1 GSI, Darmstadt,
Germany — 2 Faculty of Physics, University of Sofia, Sofia, Bulgaria
To gain information on the energy resolution of scintillators for heavy
ion detection at high particle energy an in-beam test was performed at
the Fragment Separator, FRS at GSI. Primary 197 Au beam was transported
through FRSand particle identification detectors to the scintillator
set-up. CsI(Tl)+PMT, CsI(Tl)+PIN diode, NaI(Tl), BGO and
Plastic scintillation detectors were selected for investigation.
The results of the in-beam test analysis showed satisfactory results for
the CsI(Tl)+PMT scintillator. An energy resolution of 0.46% FWHM
for 197 Au ions of 306 MeV/n ion energy was achieved with appropriate
analysis conditions. The obtainable resolution is sufficient for further
mass determination of heavy ions by calorimetry and will therefore be
chosen for the fast beam RISING [1] campaign at GSI.
[1] http://www-aix.gsi.de/ ∼ wolle/EB at GSI/rising.html
HK 48.2 Thu 16:30 F
Performance of the Pre-Shower System in the HADES Spectrometer
— •Jerzy Pietraszko for the HADEScollaboration — GSI,
Darmstadt
The Pre–Shower detector system of the HADES spectrometer is applied
to electron identification with emphasis on fast pion rejection at
forward angles. The detector is operated in the self–quenching streamer
mode (SQS) to simplify on-line recognition of electromagnetic showers.
Stable electronics at low noise guarantee robust pattern recognition
through the experimental runs. On-line analysis results delivered by
dedicated pattern recognition units show perfect agreement with results
derived in the off-line analysis. The performance of the detector and
readout system will be presented.
HK 48.3 Thu 16:45 F
HADES Drift Chambers (MDC III) — •Kalliopi Kanaki,
Frank Dohrmann, Rugard Dressler, Wolfgang Enghardt,
Eckart Grosse, Klaus Heidel, Jochen Hutsch, Burkhard
Kämpfer, Roland Kotte, Lothar Naumann, Alexandre
Sadovski, Joachim Seibert, and Manfred Sobiella for the
HADEScollaboration — Forschungszentrum Rossendorf, Institut für
Kern- und Hadronenphysik, Dresden, Germany
The starting experiments with the High Acceptance Di-Electron
Spectrometer (HADES) at GSI/Darmstadt require a momentum resolution
of about 1%, i.e. the determination of particle tracks with a precision
better than 100 µm. The tracking is accomplished mainly by largearea
Multiwire Drift Chambers. Four of the MDC’s of the third plane
(MDC III), produced in the Research Centre Rossendorf, have been already
installed in the HADESspectrometer. In this talk, the technical
aspects of the MDC III construction, the operational characteristics, and
several tests performed are discussed. We also presented simulations
of the electrical field configurations and resulting drift velocity patterns
which are aimed at an optimision of the chamber performance.
HK 48.4 Thu 17:00 F
Measurement of π 0 -induced leptons in the HADES RICH ∗ —
•T. Eberl, L. Fabbietti, J. Friese, R. Gernhäuser, J. Homolka,
H.-J. Körner, M. Münch, B. Sailer, andS. Winkler — Technische
Universität München, James-Franck-Strasse 1,D-85748 Garching
A fast Ring Imaging Cherenkov detector (RICH) is the central device
of the new dilepton spectrometer HADESat GSI, Darmstadt. It serves
as a hadron blind trigger device for e + e − pairs in hadron and heavy ion
induced collisions at 1-2 AGeV incident energy, in which π 0 are produced
abundantly.
The main sources of lepton pairs with small opening angles (1-15
degrees) are π 0 -Dalitz decays (π 0 → e ± γ) and photo conversion pairs
(π 0 → 2γ; γ → e ± ) from the target, the C4F10 gas radiator and the VUV
transparent CaF2 window. These lepton signals contribute significantly
to the combinatorial background, if they are not identified properly.
We report on the analysis and classification of measured lepton-induced
ring patterns on the RICH photocathode from a dedicated low magnetic
field measurement in correlation with data from the HADEStracking
(MDC) and time-of-flight (TOF wall) subdetectors.
∗ supported by BMBF (6TM970I) and GSI (TM-FR1).
HK 48.5 Thu 17:15 F
Charged Particle Detection with PbWO4 — •Matthias Hoek 1 ,
Werner Döring 1 , Volker Hejny 2 , Herbert Löhner 3 , Volker
Metag 1 , Rainer Novotny 1 , and Heinrich Wörtche 3 — 1 II.
Physikalisches Institut, Universität Giessen, Germany — 2 Institut für
Kernphysik, FZ-Jülich, Germany — 3 Kernfysich Versneller Instituut,
Groningen, The Netherlands
TheresponseofPbWO4 to high energy charged hadrons has been investigated
in two test experiments at the proton beam facilities COSY,
FZ-Jülich (E=1.2 GeV) and AGOR, KVI, Groningen (E=85MeV). For
the first time, the energy resolution for protons and deuterons below 360
MeV energy, which were stopped within 150 mm of PbWO4, has been
determined to σ/E=0.97%/ √ E + 3.33%. The result is comparable to
the previously deduced photon response. Energy spectra of inelastically
scattered protons below 85MeV measured with pure and doped PbWO4crystals
are compared to similar distributions obtained for BaF2- and
CeF3-detectors. The comparison to the response of charged pions indicates
a strong quenching factor (¿3) of the scintillation light for hydrogen
isotopes. The obtained results document the applicability of PbWO4 in
photon and particle detection at medium energies.
HK 48.6 Thu 17:30 F
Large-Area Glass Resistive Plate Chambers (GRPC) as Fast
Timing Detector — •Zbigniew Tyminski — Gesellschaft für Schwerionenforschung,
Darmstadt, Germany
In the framework of the FOPI upgrade project our collaboration is
planning to build another time-of-flight detector shell capable of coping
with the expected multiplicity of 80-100 charged particles (central
Au+Au collisions at 1.5A GeV) at time resolutions below 100 ps. A possible
solution are Glass Resistive Plate Chambers [1]. We have studied
several prototypes of such detectors (400 cm 2 big) with 4 gaps of 300µm
between glass plates of 0.5-2 mm thickness and intermediate strip electrodes
formed of 12 or 16 parallel strips (pitch ≈ 3mm) which are read
out on each side. The time is obtained by mean timing of the 2 signals,
their difference delivers the position along the strip; charge averaging
over neighbouring strips yields the perpendicular position. We describe
details of the prototypes as well as tests in which we have obtained σ ≈ 70
ps at efficiencies above 95%.
[1] P.Fonte et al., NIM A449(2000)295
HK 48.7 Thu 17:45 F
The potential of in-beam PET for proton therapy monitoring:
first experimental investigation — •Katia Parodi 1 , Wolfgang
Enghardt 1 ,andThomas Haberer 2 — 1 Forschungszentrum
Rossendorf e.V., Postfach 510119, 01314 Dresden — 2 Gesellschaft für
Schwerionenforschung, Planckstr. 1, 64291 Darmstadt
On the basis of the positive clinical impact of in-beam PET on the
quality assurance of carbon ion therapy at GSI Darmstadt [1] we started
to investigate the potential extension of the technique to proton therapy.
This is non-trivial, since protons cannot suffer the projectile fragmentation
process which leads to a pronounced maximum of the β + activity in
close vicinity to the dose maximum in the carbon ion case.
In our experiment three monoenergetic proton beams in the energy
and intensity range of therapeutic interest were stopped in targets of
PMMA (C5H8O2) placed in the centre of the field of view of the in-beam
positron camera installed at the GSI heavy ion therapy facility. The β +
activity signal was found to be three times larger than that induced by
carbon ions at the same range and applied physical dose. The reconstructed
spatial β + activity distributions were well reproduced in shape
by a calculation based on experimental cross-sections and on the proton
flux given by the FLUKA Monte Carlo code. Despite the weaker
spatial correlation between activity and dose depth-distributions in the
proton case, our experiment supports the feasibility of in-beam PET for
the monitoring of proton therapy based on a comparison between measured
and calculated β + activity distributions, as already implemented
for carbon ion therapy.
[1] W. Enghardt et al, Nucl. Phys. A 654 1047c (1999)

Nuclear Physics Friday
HK49 Plenary Session
Time: Friday 08:30–10:30 Room: Plenarsaal
Plenary Talk HK 49.1 Fri 08:30 Plenarsaal
New Results from HERMES — •Michael Düren for the HERMES
Kollaboration collaboration — II. Phys. Inst. Univ. Giessen
The HERMESexperiment at DESY studies the spin and flavor structure
of nucleons using the 27 GeV polarized electron beam at HERA
scattered off longitudinally polarized gas targets. After 6 years of data
taking HERMEShas produced a large variety of physics results. An
overview of the recent results is given. This year HERMESstarts to
take data on transversely polarized targets to study the transversity distributions
of quarks in nucleons. In a new proposal HERMESplans to
complete the spectrometer by a large angle recoil detector to allow for a
precision measurment of hard exclusive processes.
Plenary Talk HK 49.2 Fri 09:00 Plenarsaal
New Results from the BaBar Experiment — •Stefan Spanier
for the BABAR collaboration — SLAC
The BaBar collaboration has observed a significant CP violation in
the neutral B-meson system and is able to search for physics beyond the
Standard Model. The experiment is situated at the asymmetric e + e − collider,
PEP II of the Stanford Linear Accelerator Center (SLAC). More
than 120 million B mesons have been collected at the Υ(4S) resonance.
This allows for precision studies of lifetime-time dependent properties
and for the observation of many rare decays.
A review of the rich physics program of BaBar, which also includes
the study of D-mesons, charmed baryons, τ-leptons, and radiative processes
will be presented. Emphasis will be placed on measurements of
CP violation in the B system.
Plenary Talk HK 49.3 Fri 09:30 Plenarsaal
Nuclear quests in astrophysics — •Karlheinz Langanke —University
of Aarhus (DEnmark)
Willy Fowler once jokingly refered to astrophysics as applied nuclear
physics. Indeed nuclear physics plays a keyrole in many astrophysical
models and observations ranging from big bang to supernovae and the astrophysical
simulations cannot be better than their nuclear inputs. Very
HK50 Plenary Session
often this involves radioactive short-lived nuclei matching optimally recent
experimental and theoretical developments in nuclear physics.
The nuclear input required to model astrophysical processes should
ultimatively come from experiment. In reality, however, data have to be
supplemented by theoretical models which in turn must be constrained
and guided by experiment. There has been significant progress in modelling
nuclei, as they, for example, are important in supernovae. Much of
this is due to recent advances in modern shell model techniques. The talk
will highlight some of this progress, but also future needs in selected important
astrophysical processes. These include core-collapse supernovae,
r-process nucleosynthesis and neutron stars in binary systems.
Plenary Talk HK 49.4 Fri 10:00 Plenarsaal
Acceleration of radioactive ion beams at REX-ISOLDE — •O.
Kester for the REX-ISOLDE collaboration — Sektion Physik der LMU
München, Am Coulombwall 1, D-85748 Garching
In 2001 the linear accelerator of the Radioactive beam Experiment
(REX-ISOLDE) delivered for the first time accelerated radioactive ion
beams with a beam energy of 2 MeV/u. REX-ISOLDE uses the method
of charge state breeding, in order to enhance the charge state of the ions
before injection into the LINAC. Radioactive singly charged ions delivered
by the on-line mass separator ISOLDE are first accumulated in a
Penning trap, then charge bred to an A/q = 4.5 in an electron beam
ion source (EBIS) and finally accelerated in a LINAC from 5 keV/u to
the final energy between 0.8 and 2.2 MeV/u. Measurements of the interplay
between the REXTRAP, the transfer line and the EBIShave been
done as well as the first commissioning of the accelerator. Therewith
the properties of the different elements could be determined and a first
optimization of the system could be carried out. In two test beam times
in 2001 stable and radioactive Na isotopes ( 23 Na- 26 Na) have been accelerated
and transmitted to a preliminary target station. There 58 Ni and
Be targets have been used to populate exited states via Coulomb excitation
and nuclear transfer reactions. First results of the commissioning
and of the beam times will be presented. supported by the BMBF under
06LM974 and 06HD802I
Time: Friday 11:00–12:30 Room: Plenarsaal
Plenary Talk HK 50.1 Fri 11:00 Plenarsaal
The Advantage of Exclusiveness — •Rainer Jakob —BUGH
Wuppertal, Theoretische Physik, Gauss-Str.20, 42097 Wuppertal
Exclusive hard processes provide a distinguished view on the quark
and gluon substructure of hadrons. The additional constraint on the final
state in exclusicve processes enforces strict requirements on possible
reaction mechanisms operative at non-asymptotic momentum transfers.
The event of generalized parton distribution not only has emphasized
the close relationship between perturbative QCD descriptions of inclusive
and exclusive processes, but has greatly contributed in putting the formalism
of exclusive reactions on a sound basis in the context of Quantum
Field Theory. In generalizing the well-known and well-trusted concepts
of forward parton distribution to the non-forward cases it became evident
that only exclusive measurements can shed light on the question about
the spatial location of partons inside hadrons, and related items like the
orbital angular momentum of partons.
On overview about the present status in the description of hard exclusive
reactions will be attempted. Where are we now, and where are we
heading for ?
Plenary Talk HK 50.2 Fri 11:30 Plenarsaal
Neutron beta decay and the CKM matrix — •Oliver Zimmer
—TUMünchen, Physik Department E18, 85748 Garching
In the standard model of electroweak interactions, the quark mass
eigenstates are linked to the weak eigenstates via the Cabibbo-Kobayashi-
Maskawa (CKM) quark-mixing matrix. Traditionally, the first element
of this matrix, Vud, is determined from well-selected, pure Fermi nuclear
beta decays. An alternative derivation, which is free from corrections due
to nuclear structure, employs neutron beta decay data. Thereby comparable
accuracy has recently been attained, combining the values of the
neutron lifetime and of the neutron beta-asymmetry. Results of most accurate
determinations of Vud from both methods, including values of Vus
and Vub from high-energy physics, are in contradiction to the unitarity
of the CKM matrix. The origin of the discrepancy is still unresolved. A
survey of the field is given, emphasizing recent and ongoing developments
in neutron decay experimentation.
Plenary Talk HK 50.3 Fri 12:00 Plenarsaal
QUADRUPOLE AND MAGNETIC MOMENTS OF
NEUTRON-RICH NUCLEI FROM PROJECTILE FRAG-
MENTATION. — •Gerda Neyens for the University of Leuven,
GANIL, University of Sofia, FLNR-JINR Dubna, University of
Gottingen. collaboration — University of Leuven, Instituut voor Kernen
Stralingsfysica, Celestijnenlaan 200 D, B-3001 Leuven, Belgium
Recent advances in measuring the static moments of beams of radioactive
nuclei will be presented. In particular the study of nuclei produced
and spin-oriented in fragmentation reactions will be addressed [1-4]. By
combining different types of spin-orientation (alignment, polarization)
with different experimental techniques it is possible to measure the magnetic
dipole moments, electric quadrupole moments as well as the spin
of exotic nuclei. Some examples of recent results obtained at the GANIL
facility, such as moments and spins of nuclei near 32Mg [5,6] will be
discussed.
[1] G. Neyens et al., Nuclear Instrum. and Methods, Sect. A 340, 555
(1994).
[2] G. Neyens et al., Phys. Lett. B 393, 1-2, 36 (1997).
[3] N. Coulier et al., Phys. Rev. C 59, 1935 (1999).
[4] G. Neyens et al., Phys. Rev. Lett. 82, 497 (1999).
[5] S. Teughels et al., Ph.D. thesis K.U. Leuven, 2001
[6] D. Borremans et al., submitted Phys. Lett. B.

ALADIN-INDRA Collaboration
G. Auger1 , Ch.O. Bacri2 , M.L. Begemann-Blaich3 , N. Bellaize4
, R. Bittiger3 , F. Bocage4 , B. Borderie2 , R. Bougault4 ,
B. Bouriquet1 , Ph. Buchet5 , J.L. Charvet5 , A. Chbihi1 ,
R. Dayras5 , D. Doré5 , D. Durand4 , J.D. Frankland1 , E.
Galichet6 , D. Gourio3 , D. Guinet6 , S. Hudan1 , B. Hurst4 , H.
Orth3 , P. Lautesse6 , F. Lavaud 2 , J.L. Laville1 , C. Leduc6 ,
A. Le Fevre3 , R. Legrain5 , O. Lopez4 , J. ̷Lukasik3,7 , U. Lynen3
, W.F.J. Müller3 , L. Nalpas5 , E. Plagnol2 , E. Rosato8 ,
A. Saija9 , C. Sfienti3 , C. Schwarz3 , J.C. Steckmeyer4 , G.
Tǎbǎcaru1 , B. Tamain4 , W. Trautmann3 , A. Trzciński10 , K.
Turzó3 , M. Vigilante8 , C. Volant5 , B. Zwiegliński10 ,andA.S.
Botvina3 1GANIL, CEA et IN2P3-CNRS, B.P. 5027, F-14076 Caen, France
2IPN Orsay, IN2P3-CNRS, F-91406 Orsay, France
3Gesellschaft für Schwerionenforschung, D-64291 Darmstadt, Germany
4LPC, IN2P3-CNRS, ISMRA et Université, F-14050 Caen, France
5DAPNIA/SPhN, CEA/Saclay, F-91191 Gif sur Yvette, France
6IPN Lyon, IN2P3-CNRS et Université, F-69622 Villeurbanne, France
7H.Niewodniczański Institute of Nuclear Physics, Pl-31342 Kraków, Poland
8Dipartimento di Scienze Fisiche e INFN, Universitá di Napoli, I-80126 Napoli,
Italy
9Dipartimento di Fisica dell’ Universitá e INFN I-95129 Catania, Italy
10Soltan Institute for Nuclear Studies, Pl-00681 Warsaw, Poland
ALICE-TRD Collaboration
A. Andronic1 , V. Angelov2 , H. Appelshäuser3 , C. Blume1 ,
P. Braun-Munzinger1 , D. Bucher4 , O. Busch1 , A. Castillo-
Ramirez1 , V. Cătănescu5 , M. Ciobanu5 , S . Chernenko6 , V.
Chepurnov6 , H. Daues1 , A. Devismes1 , O. Fateev6 , C. Finck1 ,
P. Foka1 , C. Garabatos1 , R. Glasow4 , M. Gutfleisch2 , N. Herrmann3
, M. Ivanov1 , F. Lesser2 , V. Lindenstruth2 , T. Lister4 ,
T. Mahmoud3 , A. Marin1 , D. Miskowiec1 , Yu. Panebratsev6 ,
T. Peitzmann4 , V. Petracek3 , M. Petrovici5 , C. Reichling2 , K.
Reygers4 , A. Sandoval1 , R. Santo4 , R. Schicker3 , R. Schneider2
, S . S edykh1 , S. Shimanski6 , R.S. Simon1 , L. Smykov6 , J.
Stachel 3 , H. Stelzer1 , H. Tilsner3 , G. Tsiledakis1 , I. Rusanov3 ,
B. Vulpescu3 , J. Wessels3 , B. Windelband3 , O. Winkelmann4 ,
C. Xu3 , V. Yurevich6 , Yu. Zanevsky6 ,andO. Zaudtke4 1Gesellschaft für Schwerionenforschung, Darmstadt, Germany
2Kirchhoff Institut für Physik, Heidelberg, Germany
3Physikalisches Institut der Universität Heidelberg, Germany
4Institut für Kernphysik, Universität Münster, Germany
5 NIPNE Bucharest, Romania
6 JINR Dubna, Russia
ANKE Collaboration
V. Abaev 1 , V. Abazov 2 , H.-H. Adam 3 , N. Amaglobeli 4 , R.
Baldauf 5 , S . Barsov 1 , U. Bechstedt 6 , S. Belostotski 1 , G.
Borchert 6 , W. Borgs 6 , M. Büscher 6 , W. Cassing 7 , V. Chernetsky
8 , V. Chernyshev 8 , B. Chiladze 4 , M. Chumakov 8 , A.
Churin 2 , J. Dietrich 6 , V. Dimitrov 9 , M. Drochner 5 , S . Dymov
6 , R. Engels 10 , W. Erven 5 , P. Fedorets 8 , A. Gerasimov 8 ,
Ye.S. Golubeva 11 , O. Gorchakov 2 , V. Goryachev 8 , D. Gotta 6 ,
O. Grebenyuk 1 , V. Grishina 11 , D. Grzonka 6 , G. Hansen 12 ,
M. Hartmann 6 , V. Hejny 6 , L. Jarczyk 13 , A. Kacharava 2,4 ,
N. Kadagidze 2 , B. Kamys 13 , M. Karnadi 6 , A. Khoukaz 3 , St.
Kistryn 13 , V. Kleber 6 , F. Klehr 12 , H. Kleines 5 , H.R. Koch 6 ,
N. Koch 14 , V.I. Komarov 2 , L. Kondratyuk 8 , V. Koptev 1 , A.
Kovalov 1 , P. Kravchenko 1 , P. Kravtsov 1 , V. Kruglov 2 , P. Kulessa
6,15 , A. Kulikov 2,16 , A. Kurbatov 2 , N. Lang 3 , N. Langenhagen
9 , I. Lehmann 6 , V. Leontiev 2,16 , Th. Lister 3 , H. Loevenich
5 , B. Lorentz 6 , S . Lorenz 14 , G. Macharashvili 2,4 , Y.
Maeda 6 , R. Maier 6 , T. Mersmann 3 , S. Merzliakov 2,16 , M.
Mikirtychiants 6 , S. Mikirtychiants 1 , H. Müller 9 , A. Mussgiller
6 , M. Nekipelov 6 , R. Nellen 6 , V. Nelyubin 1 , M. Nioradze
4 , H. Ohm 6 , A. Petrus 2 , D. Prasuhn 6 , D. Protic 6 , K.
Collaborations
Collaborations
Pysz 15 , C. Quentmeier 3 , F. Rathmann 6 , B. Rimarzig 9 , Z. Rudy 13 ,
R. Santo 3 , J. Sarkadi 5 , H. Paetz gen.Schieck 10 , R. Schleichert
6 , F. Schmidt 14 , Chr. Schneider 9 , H. Schneider 6 , O.W.B.
Schult 6 , J. Seibert 9 , H. Seyfarth 6 , A. Sibirtsev 6 , K. Sistemich
6 , J. Smyrski 13 , E. Steffens 14 , H.J. Stein 6 , H. Ströher 6 ,
A. Strzalkowski 13 , S . Trusov 16 , Yu. Uzikov 2 , A. Vassiliev 1 ,
A. Volkov 2 , K.-H. Watzlawik 6 , C. Wilkin 17 , P. Wüstner 5 , S.
Yaschenko 2 , V. Yazkov 16 , B. Zalikhanov 2 , N. Zhuravlev 2 , K.
Zwoll 5 ,andI. Zychor 18
1 High Energy Physics Department, Petersburg Nuclear Physics Institute,
188350 Gatchina, Russia
2 Laboratory of Nuclear Problems, Joint Institute for Nuclear Research,
Dubna, 141980 Dubna, Moscow Region, Russia
3 Institut für Kernphysik, Universität Münster, W.-Klemm-Str. 9, D-48149
Münster
4 High Energy Physics Institute, Tbilisi State University, University Str.9,
380086 Tbilisi, Georgia
5 Zentrallabor für Elektronik, Forschungszentrum Jülich, D-52425 Jülich
6 Institut für Kernphysik, Forschungszentrum Jülich, D-52425 Jülich
7 Institut für Theoretische Physik, Universität Gießen, H.-Buff-Ring 16, D-
35392 Gießen
8Institute for Theoretical and Experimental Physics, Cheremushkinskaya 25,
117259 Moscow, Russia
9Institut für Hadronen- und Kernphysik, Forschungszentrum Rossendorf, D-
01474 Dresden
10Institut für Kernphysik,Universität Köln, Zülpicher Str.77, D-50937 Köln
11Institute for Nuclear Research, Russian Academy of Sciences, Moscow
117312, Russia
12Zentralabteilung Technologie, Forschungszentrum Jülich, D-52425 Jülich
13Institute of Physics, Jagellonian University, Reymonta 4, PL-30059 Cracow,
Poland
14 Physikalisches Institut II, Universität Erlangen-Nürnberg, Erwin-Rommel-
Str.1, D-91058 Erlangen
15 Institute of Nuclear Physics, Radzikowskiego 152, PL-31342, Cracow, Poland
16 Dubna Branch, Moscow State University, 141980 Dubna Moscow Region,
Russia
17Physics Department, Univ.College London, Gower Street, London WC1
6BT, England
18The Andrzej Soltan Institute for Nuclear Studies, PL-05400 Swierk, Poland
Antiproton Physics Study Group Collaboration
T. Barnes 1 , D. Bettoni 2 , R. Calabrese 2 , W. Cassing 3 , M.
Düren 3 , S. Ganzhur 4 , A. Gillitzer 5 , O. Hartmann 6 , V. Hejny 5 ,
P. Kienle 7 , H. Koch 4 , W. Kühn 3 , U. Lynen 6 , R. Meier 8 , V.
Metag 3 , P. Moskal 5 , H. Orth 6 , S . Paul 7 , K. Peters 4 , J.
Pochodzalla 9 , J. Ritman 3 , M. Sapojnikov 10 , L. Schmitt 7 , C.
Schwarz 6 , K. Seth 11 , N. Vlassov 10 , W. Weise 7 ,andU. Wiedner
12
1 University of Tennessee, Knoxville
2INFN, Ferrara
3Universität Gießen
4Experimentalphysik I, Bochum
5Institut für Kernphysik, FZ Jülich
6GSI, Darmstadt
7Technische Universität München
8Physikalisches Institut, Tübingen
9Institit für Kernphysik, Mainz
10JINP, Dubna
11Northwestern University, Evanston
12 ISV, Uppsala
A1 Collaboration
K. Aniol 1 , J.R.M. Annand 2 , M. Ases Antelo 3 , P. Barneo Gonzalez
4 , P. Bartsch 3 , D. Baumann 3 , J. Bermuth 5 , A.M. Bernstein
6 , W. Bertozzi 6 , F. Bloch 7 , H.P. Blok 4 , W.U. Boeglin 8 , R.
Böhm 3 , D. Bosnar 9 , D. Branford 10 , E. Burtin 11 , C. Carrasco 7 ,
J.P. Chen 6 , D. Dale 12 , L. Dennis 13 , N. d’Hose 11 , S. Dieterich 14 ,

M. Ding3 , M.O. Distler3 , P. Dragovitsch13 , D. Elsner3 , M.B.
Epstein1 , I. Ewald3 , K.G. Fissum6 , K. Föhl10 , H. Fonvielle15 , J.
Friedrich3 , J.M. Friedrich3 , M. Garçon11 , A. Gasparian12 , S.
Gilad6 , R. Gilman14 , C. Glashausser14 , D. Glazier2 , P. Grabmayr16
, P.A.M. Guichon11 , M. Hauger7 , S. Hedicke3 , T. Hehl16 ,
W. Heil5 , J. Heim16 , W.H.A. Hesselink4 , D.G. Ireland2 , E.
Jans17 , P. Jennewein3 , X. Jiang14 , J. Jourdan7 , M. Kahrau3 ,
S. Kerhoas-Cavata 11 , T. Klechneva7 , F. Klein3 , F. Klein18 ,
D. Knödler19 , M. Kohl20 , A. Koslov21 , B. Krusche7 , K.W.
Krygier3 , G. Kumbartzki14 , L. Lapikás17 , A. Liesenfeld3 , D.J.
Margaziotis1 , S.Malov14 , I.J.D. MacGregor2 , J. Marroncle11 ,
S. McAleer13 , H. Merkel3 , K. Merle3 , P. Merle3 , R.A. Miskimen22
, H. Müther19 , U. Müller3 , F.A. Natter16 , R. Neuhausen3 ,
K. Normand7 , M. Ostrick18 , E.W. Otten5 , B. Pasquini23 , R.
Perez Benito3 , J. Pochodzalla3 , Th. Pospischil3 , M. Potokar24
, C. Rangacharyulu25 , R.D. Ransome14 , G. Riccardi13 ,
A. Richter20 , R. Roche13 , D. Rohe7 , G. Rosner2 , D. Rowntree6
, J. Sanner3 , A. Sarty13 , H. Schmieden3 , G. Schrieder20 ,
M. Seimetz3 , I. Sick7 , S. ˇSirca24 , S. Strauch14 , A. Süle3 , G.
Tamas 3 , J.A. Templon26 , M. Thompson21 , R. Van de Vyver27 , L.
Van Hoorebeke27 , M. Vanderhaegen3 , H. de Vries17 , A. Wagner3
, G.J. Wagner16 , Th. Walcher3 , G.A. Warren7 , M. Weis3 ,
H. Wöhrle7 , J. Zhao6 ,andZ. Zhou6 1California State University, Los Angeles, USA
2D.of Physics and Astronomy, U.Glasgow, Glasgow G12 8QQ, Scotland, UK
3Institut für Kernphysik, Universität Mainz, D-55099 Mainz
4Vrije Universiteit, Amsterdam, The Netherlands
5Institut für Physik, Universität Mainz, D-55099 Mainz
6Massachusetts Institute of Technology, Cambridge, USA
7Institut für Physik, Universität Basel, CH-4056 Basel
8Florida International University, Miami, USA
9Department of Physics, Univ.of Zagreb, Croatia
10Physics Department, U.Edinburgh, Scotland, UK
11CEN Saclay, DAPNIA/SPhN, Gif sur Yvette, France
12University of Kentucky, Lexington, USA
13Florida State University, Tallahassee, USA
14Physics Department, Rutgers University, Piscataway, USA
15LPC, Univ.Blaise Pascal, IN2P3 Aubiere, France
16Physikalisches Institut, U.Tübingen, D-72076 Tübingen
17NIKHEF, Amsterdam, The Netherlands
18Physikalisches Institut, Universität Bonn, D-53012 Bonn
19Institut für Theoretische Physik, U.Tübingen, D-72076 Tübingen
20Institut für Kernphysik, TU Darmstadt, D-64289 Darmstadt
21School of Physics, U.of Melbourne, Parkville, Australia
22Department of Physics, U.of Massachusetts, Amherst, USA
23ECT, Villazzano, Trento, Italy
24Institut ”Joˇzef Stefan”, Univ.of Ljubljana, Slovenia
25University of Saskatchewan, Saskatoon, Canada
26Department of Physics and Astronomy, U.of Georgia, Athens, GA, USA
27 University of Gent, Belgium
A2 Collaboration
J. Ahrens 1 , J. Albert 1 , V. Alekseyev 2 , S. Altieri 3 , J.R.M.
Annand 4 , I. Anthony 4 , G. Anton 5 , H.-J. Arends 1 , R. Beck 1 ,
A. Bernstein 6 , A. Braghieri 3 , D. Branford 7 , M. Camen 8 , G.
Caselotti 1 , S. Cherepnya 2 , P. Clive 4 , T. Davinson 7 , N. d’Hose 9 ,
H. Dutz 10 , L. Fil’kov 2 , L. Fog 4 , K. Föhl 7 , N. Gimenez 1 , S.
Gimeno 1 , P. Grabmayr 11 , N.P. Harrington 7 , S . Hasegawa 1 ,
T. Hehl 11 , E. Heid 1 , J. Heim 11 , V. Hejny 12 , K. Helbing 5 , H.
Holvoet 13 , L. van Hoorebeke 13 , D. Hornidge 1 , D.G. Ireland 4 ,
O. Jahn 1 , S. Janssen 14 , P. Jennewein 1 , R. Kaiser 4 , V. Kashevarov
2 , J.D. Kellie 4 , C. Klempt 1 , R. Kondratjev 15 , K.
Kossert 8 , M. Kotulla 14 , D. Krambrich 1 , J. Krimmer 11 , B. Krusche
16 , M. Lang 1 , B. Lannoy 13 , R. Leukel 1 , M. Lich 14 , V.
Lisin 15 , K. Livingston 4 , I.J.D. MacGregor 4 , F. Mackay 4 , I.
Martin 11 , J.C. McGeorge 4 , D. Menze 10 , J. Messchendorp 14 ,
V. Metag 14 , W. Meyer 17 , K. Monstad 4 , F.A. Natter 11 , R.
Novotny 14 , A. Ostrowski 7 , R.O. Owens 4 , A. Panzeri 3 , P. Pedroni
3 , M. Pfeiffer 14 , T. Pinelli 3 , A. Polonski 15 , I. Preobrajenski
1 , A. Reiter 4 , G. Rosner 4 , M. Rost 1 , D. Ryckbosch 13 ,
S . S ack 14 , R. Sanderson 4 , S. Schadmand 14 , A. Schmidt 1 , B.
Schoch 10 , M. Schumacher 8 , B. Seitz 8 , H. Ströher 12 , G. Tamas 1 ,
A. Thomas 1 , D. Trnka 14 , R. van de Vyver 13 , S. Waddell 4 , G.J.
Wagner 11 , Th. Walcher 1 , D. Watts 4 , J. Weiss 14 , B. Windisch 1 ,
Collaborations
F. Wissmann8 , S.Wolf8 ,andF. Zapadtka8 1Institut für Kernphysik, Universität Mainz, D-55099 Mainz
2Lebedev Physical Institute, Leninsky Prospect 53, 117924 Moscow, Russia
3INFNSezionediPavia,Pavia,I 4Department of Physics & Astronomy, University of Glasgow, Glasgow G12
8QQ, Scotland, UK
5Physikalisches Institut, Universität Erlangen–Nürnberg, D-44801 Erlangen
6Massachusetts Institute of Technology, Cambridge MA, USA
7Department of Physics & Astronomy, University of Edinburgh, Edinburgh,
UK
8II.Physikalisches Institut, Universität Göttingen, D-37073 Göttingen
9CEN Saclay, DAPNIA/SPhN, Gif sur Yvette, F
10Physikalisches Institut, Universität Bonn, D-53115 Bonn
11Physikalisches Institut, Universität Tübingen, D-72076 Tübingen
12Forschungszentrum Jülich, D-52425 Jülich
13Nuclear Physics Laboratory, Proeftuinstraat 86, B-9000 Gent
14II.Physikalisches Institut, Universität Gießen, D-35392 Gießen
15Institute for Nuclear Research, Academy of Science, Moscow, Russia
16Department of Physics and Astronomy, University of Basel, CH4056 Basel
17Institut für Experimentalphysik, Ruhr-Universität Bochum, D-44801
Bochum
CELSIUS/WASA Collaboration
C. Bargholtz1 , D. Bogoslawsky2 , A. Bondar3 , H. Calén4 ,
H. Clement5 , L. Demirörs6 , C. Ekström4 , K. Franson4 , M.
Gornov7 , V. Grebenev7 , J. Greiff4 , Y. Gurov7 , L. Gustafsson8
, B. Höistad8 , G. Ivanov2 , M. Jacewicz8 , E. Jiganov2 ,
A. Johansson8 , T. Johansson8 , S. Keleta8 , K. Kilian9 , N.
Kimura10 , I. Koch8 , S. Kullander8 , A. Kup´sć 4 , L. Kurdadze3 ,
A. Kuzmin3 , A. Kuznetsov2 , P. Marciniewski4 , B. Morosov2 ,
B.M.K. Nefkens11 , W. Oelert9 , S . Oreshkin3 , C. Pauly6 , Y.
Petukhov2 , A. Povtorejko2 , J. Pätzold5 , R.J.M.Y. Ruber4 ,
V. Sandukovsky2 , W. Scobel6 , T. Sefzick9 , R. Shafigullin7 ,
V. Sidorov3 , B. Shwartz3 , V. Sopov12 , J. Stepaniak13 , A.
Sukhanov3 , V. Tchernychev12 , P–E. Tegnér1 , P. Thörngren
Engblom8 , V. Tikhomirov2 , A. Turowiecki14 , G. Wagner5 , U.
Wiedner8 , K. Wilhelmsen1 , Z. Wilhelmi14 , A. Yamamoto10 , H.
Yamaoka10 , J. Zabierowski15 ,andJ. Zlomańczuk8 1Stockholm University, Sweden
2Joint Institute for Nuclear Research, Dubna, 101000 Moscow, Russia
3Budker Institute of Nuclear Physics, Novosibirsk 630090, Russia
4The Svedberg Laboratory, S–75121 Uppsala, Sweden
5Physikalisches Institut, Tübingen University, D–72076 Tübingen, Germany
6Institut für Experimentalphysik, Hamburg University, D–22761 Hamburg,
Germany
7Mephi, Moscow, Russia
8Department of Radiation Sciences, Uppsala University, S–75121 Uppsala,
Sweden
9 IKP, Forschungszentrum Jülich GmbH, D–52425 Jülich, Germany
10 KEK, Tsukuba, Japan
11 UCLA, Los Angeles, USA
12 ITEP, Moscow, Russia
13 Soltan Institute for Nuclear Studies, PL–00681 Warsaw, Poland
14 Intitute for Experimental Physics, Warsaw University, PL–0061 Warsaw,
Poland
15 Soltan Institute for Nuclear Studies, PL–90137 Lód´z, Poland
CHAOS Collaboration
P.A. Amaudruz1 , A. Ambardar2 , R. Bilger3 , F. Bonutti4 , J.T.
Brack5 , J. Breitschopf3 , P. Camerini4 , J. Clark6 , H. Clement3 ,
H. Denz3 , L. Felawka1 , E. Fragiacomo4 , E. Friedman7 , E. Gibson8
, J. Gräter3 , N. Grion4 , G.J. Hofman5 , P. Hong9 , M. Kermani2
, E.L. Mathie9 , R. Meier3 , G. Moloney6 , D. Ottewell1 ,
O. Patarakin10 , M. Pavan 1 , R.J. Peterson5 , R.A. Ristinen5 , R.
Rui4 , M. Schepkin11 , M.E. Sevior6 , G.R. Smith12 , R. Tacik9 , G.
Tagliente2 , G.J. Wagner3 ,andF. von Wrochem3 1TRIUMF, 4004 Wesbrook Mall, Vancouver BC, Canada V6T 2A3
2Dept.of Physics and Astronomy, University of British Columbia, Vancouver
BC, Canada V6T 2A6
3 Physikalisches Institut, Universität Tübingen, Auf der Morgenstelle 14, D-
72076 Tübingen
4 University and INFN Trieste, 34127 Trieste, Italy
5 University of Colorado, Boulder CO 80309-0446, USA

6 School of Physics, University of Melbourne, Parkville, Victoria 3052, Aus-
tralia
7 Racah Institute of Physics, The Hebrew University, Jerusalem 91904, Israel
8 California State University, Sacramento CA 95819, USA
9 University of Regina, Regina Saskatchewan, Canada S4S 0A2
10 RRC Kurchatov Institute, 123182 Moscow, Russia
11 ITEP Moscow, 117218 Moscow, Russia
12 Jefferson Laboratory, Newport News, VA 23606, USA
COSY-TOF Collaboration
M. Abdel-Bary1 , S. Abdel-Samad1 , R. Bilger2 , K.-Th.
Brinkmann3 , H. Clement2 , E. Dorochkevitch2 , M. Drochner1 ,
S. Dshemuchadse3 , H. Dutz4 , A. Erhardt2 , W. Eyrich5 ,
D. Filges1 , A. Filippi6 , H. Freiesleben3 , M. Fritsch5 , A.
Gillitzer1 , D. Hesselbarth1 , R. Jäkel3 , B. Jakob3 , L. Karsch3 ,
K. Kilian1 , H. Koch7 , J. Kress2 , E. Kuhlmann3 , S . Marcello6
, S. Marwinski1 , S.Mauro7 , R. Meier2 , W. Meyer7 , K.
Möller8 , H.P. Morsch1 , H. Nann9 , L. Naumann8 , N. Paul1 ,
E. Roderburg1 , P. Schönmeier3 , W. Schröder5 , M. Schulte-
Wissermann3 , T. Sefzick1 , F. Stinzing5 , G.Y. Sun3 , G.J. Wagner2
, M. Wagner5 , A. Wilms7 , P. Wintz1 , S . Wirth5 , P.
Wüstner1 , G. Zangh2 ,andP. Zupranski10 1Forschungszentrum Jülich
2Universität Tübingen
3Technische Universität Dresden
4Universität Bonn
5Universität Erlangen-Nürnberg
6 INFN Torino
7 Ruhr-Universität Bochum
8 Forschungszentrum Rossendorf
9 IUCF Bloomington
10 SINS Warschau
COSY–11 Collaboration
H.-H. Adam1 , A. Budzanowski2 , R. Czyzykiewicz3 , I. Geck1 , D.
Grzonka4 , M. Janusz3 , L. Jarczyk3 , B. Kamys3 , A. Khoukaz1 ,
K. Kilian4 , C. Kolf4 , P. Kowina4,5 , N. Lang1 , T. Lister1 , P.
Moskal3 , W. Oelert4 , C. Quentmeier1 , R. Santo1 , G. Schepers4
, T. Sefzick4 , M. Siemaszko5 , J. Smyrski3 , S.Steltenkamp1 ,
A. Strza̷lkowski3 , P. Winter4 , M. Wolke4 , P. Wüstner6 ,and
W. Zipper5 1Institut für Kernphysik, Westfälische Wilhelms–Universität, 48149 Münster
2Institute of Nuclear Physics, 31–342 Cracow, Poland
3Institute of Physics, Jagellonian University, 30–059 Cracow, Poland
4Institut für Kernphysik, Forschungszentrum Jülich, 52425 Jülich
5Institute of Physics, Silesian University, 40–007 Katowice, Poland
6Zentrallabor für Elektronik, Forschungszentrum Jülich, 52425 Jülich
E91016 Collaboration
D. Abbott1 , A. Ahmidouch2,3,4 , P. Ambrozewicz5 , C.SArmstrong1,6
, J. Arrington7,8 , R. Asaturyan9 , K. Assamagan3 , S.
Avery 3 , K. Bailey7 , O.K. Baker3 , S. Beedoe2 , H. Bitao3 , W.
Boeglin10,1 , H. Breuer11 , D.S. Brown11 , R. Carlini1 , J. Cha3 , N.
Chant11 , E. Christy3 , A. Cochran3 , L. Cole3 , G. Collins11 , C.
Cothran12 , J. Crowder13 , W.J. Cummings7 , S. Danagoulian2,1 ,
F. Dohrmann7,14 , F. Duncan11 , J. Dunne1 , D. Dutta15 , T. Eden3 ,
M. Elaasar16 , R. Ent1 , L. Ewell11 , H. Fenker1 , H.T. Fortune17 ,
Y. Fujii18 , L.b Gan3 , H. Gao7 , K. Garrow1 , D.F. Geesaman7 , P.
Gueye3 , K. Gustafsson11 , K. Hafidi7 , J.O. Hansen7 , W. Hinton3
, H.E. Jackson7 , H. Juengst19 , C. Keppel3 , A. Klein20 , D.
Koltenuk17 , Y. Liang21 , J.H. Liu19 , A. Lung1 , D. Mack1 , R.
Madey3,4 , P. Markowitz10,1 , C.J. Martoff5 , D. Meekins1 , J.
Mitchell1 , T. Miyoshi18 , H. Mkrtchyan9 , R. Mohring11 , S.K.
Mtingwa2 , B. Mueller7 , T.G. O’Neill7 , G. Niculescu3,22 , I.
Niculescu3,23 , D. Potterveld7 , J.W. Price23 , B.A. Raue10,1 , P.E.
Reimer7 , J. Reinhold10,1,7 , J. Roche6 , P. Roos11 , M. Sarsour24 ,
Y. Sato18 , G. Savage 3 , R. Sawafta2 , R.E. Segel15 , A. Semenov4 ,
S. Stepanyan9 , V. Tadevosian9 , S.Tajima25 , L. Tang3 , B. Terburg26
, A. Uzzle3 , S. Wood1 , H. Yamaguchi18 , C. Yan-11 , C.
Yan-24 , L. Yuan3 , B. Zeidman7 , M. Zeier12 ,andB. Zihlmann12 1Thomas Jefferson National Accelerator Laboratory
2NC A&T State University
3 Hampton University
4 Kent State University
5 Temple University
6 College of William and Mary
7 Argonne National Laborator
8 California Institute of Technology
9 Yerevan Physics Institute
10 Florida International University
11 University of Maryland
12 University of Virginia
13 Juniata College
14 Forschungszentrum Rossendorf
15 Northwestern University
16 Southern University at New Orleans
17 University of Pennsylvania
18 Tohoku University
19 University of Minnesota
20 Old Dominion University
21 American University
22 The George Washington University
23 Rensselaer Polytechnic Institute
24 University of Houston
25 Duke University
26 University of Illinois
FOPI Collaboration
Collaborations
A. Andronic1 , V. Barret2 , Z. Basrak3 , N. Bastid2 , G. Berek4 ,
A. Bendarag2 , R. Čaplar3 , P. Crochet2 , A. Devismes1 , P.
Dupieux2 , M. Dˇzelalija3 , C. Finck1 , Z. Fodor4 , A. Gobbi1 , Y.
Grishkin5 , O. Hartmann1 , N. Herrmann6 , K.D. Hildenbrand1 ,
B. Hong7 , D. Kang7 , J. Kecskemeti4 , Y.J. Kim7 , M. Kirejczyk8 ,
M. Korolija3 , R. Kotte9 , P. Koczon1 , T. Kress1 , R. Kutsche1 ,
A. Lebedev5 , Y. Leifels1 , V. Manko10 , M. Merschmeyer6 , D.
Moisa11 , W. Neubert9 , D. Pelte6 , M. Petrovici11 , F. Rami12 ,
W. Reisdorf1 , B. de Schauenburg12 , D. Schüll1 , Z. Seres4 ,
B. Sikora8 , K. Sim7 , V. Simion11 , K. Siwek-Wilczyńska8 , M.
Smolarkiewicz8 , J. Soliwoda-Poddany8 , V. Smolyankin5 , M.R.
Stockmeier6 , G. Stoicea11 , Z. Tyminski1 , P. Wagner12 , K.
Wisńiewski6 , D. Wohlfarth 9 , J. Yang7 , I. Yushmanov10 ,andA.
Zhilin5 1GSI Darmstadt
2LPC Clermont-Ferrand
3RBI Zagreb
4KFKI Budapest
5ITEP Moscow
6Universität Heidelberg
7Korea University Seoul
8University of Warsaw
9FZ Rossendorf/Dresden
10KI Moscow
11NIPNE Bucharest
12IReS Strasbourg
FRS/LAND Collaboration
D. Aleksandrov1 , T. Aumann2 , L. Axelsson3 , U. Bergmann4,5 ,
T. Baumann2,6 , K. Boretzky7 , M.J.G. Borge8 , L.V. Chulkov2,1 ,
R. Collatz2 , D. Cortina-Gil2 , J. Cub2 , U. Datta Pramanik2 , W.
Dostal7 , B. Eberlein7 , Th.W. Elze9 , H. Emling2 , L.M. Fraile5,8 ,
H. Geissel2 , V.Z. Goldberg1 , M. Golovkov1 , A. Grünschloss9 ,
M. Hellström2 , J. Holeczek10 , R. Holzmann2 , M. Ivanov11 , N.
Iwasa12 , R. Janik11 , K. Jones2 , B. Jonson3 , A.A. Korsheninnikov12
, J.V. Kratz7 , G. Kraus2 , R. Kulessa13 , Y. Leifels2 ,
H. Lenske14 , A. Leistenschneider9 , T. Leth4 , E. Lubkiewicz13 ,
M. Meister15,3 , I. Mukha15,2,1 , G. Münzenberg2 , F. Nickel2 , T.
Nilsson5,3 , G. Nyman3 , A. Ozawa 12 , R. Palit9 , B. Petersen4 , A.
Richter15 , C. Scheidenberger2 , G. Schrieder15 , W. Schwab2 , H.
Simon15 , B. Sitar11 , M.H. Smedberg3 , M. Steiner6 , J. Stroth9 ,
K. Sümmerrer2 , A. Surowiec10 , T. Suzuki12 , O. Tengblad8 , E.
Wajda 13 , W. Walus13 , M. Winkler2 ,andM. Zhukov3 1Kurchatov Institute, R-123182 Moscow
2Gesellschaft für Schwerionenforschung (GSI), D–64291 Darmstadt, Germany
3Fysiska Institutionen, Chalmers Tekniska Högskola och Göteborgs Univer-
sitet, S–412 96 Göteborg, Sweden

4 Institut for Fysik og Astronomi, Aarhus Universitet, DK–8000 Aarhus C,
Denmark
5EP Division, CERN, CH–1211 Genève 23, Switzerland
6Michigan State University, East Lansing, MI 48824-132, USA
7Institut für Kernchemie, Johannes Gutenberg-Universität, D–55099 Mainz,
Germany
8Insto.Estructura de la Materia, CSIC, E–28006 Madrid, Spain
9Institut für Kernphysik, Johann-Wolfgang-Goethe-Universität, D–60486
Frankfurt, Germany
10Institute of Physics, University of Silesia, PL–40-007 Katowice, Poland
11Faculty of Mathematics and Physics, Comenius University, SK–84215
Bratislava, Slovakia
12RIKEN, 2-1 Hirosawa, Wako, Saitama 351-01, Japan
13Instytut Fizyki, Uniwersytet Jagelloński, PL–30-059 Kraków, Poland
14Institut für Theoretische Physik I, D–35392 Giessen, Germany
15Institut für Kernphysik, Technische Universiät Darmstadt, D–64289 Darm-
stadt, Germany
GSI-ISOL Collaboration
J. Äystö1 , M. Axiotis2 , L. Batist3 , V. Belleguic4 , B. Blank5 ,
A. Blazhev4 , R. Borcea4 , G. Canchel5 , D. Cano-Ott6,7 , E.
Caurier8 , M. Chartier9 , G. de Angelis2 , P. Dendooven1 ,
J. Döring4 , E. Farnea6 , A. Fassbender4 , Y. Fujita10 , A.
Gadea2,6 , S. Galanoupoulos11 , M. Gierlik12 , M. Górska4,13 , H.
Grawe4 , S. Harissopulos10 , N. Harrington14 , M. Hellström4,15 ,
Z. Janas4,11 , A. Jokinen1 , A. Jungclaus16 , M. Kapica4 , M.
Karny12 , R. Kirchner4 , J. Kurcewicz4,12 , M. La Commara4,17 ,
G.A. Lallazissis18,19 , S . Lenzi20 , H. Mahmud14 , G. Martínez-
Pinedo21 , P. Mayet4 , C. Mazzocchi4,22 , P. Monro14 , F. Moroz3 ,
I. Mukha4 , E. Nácher González4,6 , D.R. Napoli2 , A. Nieminen1 ,
A. Ostrowski14 , J.R. Pavan 23 , H. Penttilä1 , C. Plettner4,24 ,
A. P̷lochocki12 , G. Rainowski24 , M. Rejmund4 , P. Ring19 , E.
Roeckl 4 , B. Rubio6 , G. Savard 25 , M. Sawicka4 , C. Schlegel4 , M.
Shibata4 , K. Schmidt4,14 , R. Schwengner24 , J.L. Tain6 , S.L. Tabor23
, C.A. Ur20 , S.L. Wiedekind23 , V. Wittman3 , P.J. Woods14 ,
and J. ˙ Zylicz12 1Dept.of Physics, University of Jyväskylä, FIN-40351 Jyväskylä, Finland
2Laboratori Nazionali di Legnaro, I-35020 Legnaro, Italy
3St.Petersburg Nuclear Physics Institute, RU-188-350 Gatchina, Russia
4Gesellschaft für Schwerionenforschung, D-64291 Darmstadt, Germany
5Centre d’Etudes Nucléaires de Bordeaux, F-33175 Gradignan, France
6Instituto de Física Corpuscular, E-46100 Burjassot (Valencia), Spain
7CIEMAT, Facet Group, Dept.of Nuclear Fission, E-28040 Madrid, Spain
8Institut de Recherches Subatomique, F-67037 Strasbourg, France
9Dept.of Physics, University of Liverpool, Liverpool L69 7ZE, United Kingdom
10Dept.of Physics, Osaka University, Osaka 560-0043, Japan
11Institute of Nuclear Physics, NSCR Demokritos, GR-15130 Aghia Paraskevi,
Greece
12Institute of Experimental Physics, University of Warsaw, PL-00681 Warsaw,
Poland
13Instituut voor Kern- en Stralingsfysica, University of Leuven, B-3001 Leuven,
Belgium
14Dept.of Physics and Astronomy, University of Edinburgh, Edinburgh EH9
3JZ, United Kingdom
15 Dept.of Physics, Lund University, S-22362.Sweden
16 II.Physikalisches Institut, Universität Göttingen, D-37073 Göttingen, Ger-
many
17Dipartimento di Scienze Fisiche, Universitá di Napoli “Federico Secundo”,
I-80126 Napoli, Italy
18Physics Dept., Aristotele University of Thessaloniki, GR-54006 Thessaloniki,
Greece
19 Physics Dept., Technical University München, D-85748 Garching, Germany
20 Dipartimento di Fisica dell’Universita di Padova and INFN, I-35100 Padova,
Italy
21 Dept.of Physics and Astronomy, University of Basel, CH-4056 Basel,
Switzerland
22 Universitá degli Studi di Milano, I-20133 Milano, Italy
23 Dept.of Physics, Florida State University, Talahassee, FL 32306, USA
24 Institut für Kern- und Hadronenphysik, Forschungszentrum Rossendorf, D-
01314 Dresden, Germany
25 Physics Div., Argonne National Laboatory, Argonne, IL 60439-4843, USA
HADES Collaboration
Collaborations
G. Agakichiev1 , C. Agodi2 , H. Alvarez-Pol3 , E. Badura1 , A.
Balanda4 , R. Bassini5 , G. Bellia2 , D. Bertini1 , J. Bielcik1 , M.
Boehmer6 , C. Boiano5 , H. Bokemeyer1 , J.L. Boyard7 , S.Brambilla5
, P. Braun-Munzinger1 , S.Chernenko8 , R. Coniglione2 ,
L. Cosentino2 , M. Dahlinger1 , H. Daues1 , R. Dressler9 , I. Duran3
, Th. Eberl6 , L. Fabbietti6 , O. Fateev8 , C. Fernandez3 , P.
Finocchiaro2 , J. Friese6 , I. Froehlich10 , B. Fuentes3 , J. Garzon3
, R. Gernhaeuser6 , M. Golubeva11 , E. Grosse9 , F. Guber11 ,
J. Hehner1 , Th. Hennino7 , S. Hlavac 12 , J. Hoffmann1 , R. Holzmann1
, J. Homolka6 , A. Ierusalimov8 , I. Iori5 , R. Ispyrian13 , M.
Jaskula4 , J.C. Jourdain7 , M. Kajetanovic4 , B. Kaempfer9 , K.
Kanaki9 , T. Karavicheva11 , A. Kastenmueller6 , L. Kidon4 , P.
Kienle6 , I. Koenig1 , W. Koenig1 , B.W. Kolb1 , H.-J. Koerner6 ,
R. Kotte9 , A. Kugler14 , W. Kuehn10 , R. Kulessa4 , A. Kurepin11
, J. Lehnert10 , E. Lins10 , R. Lorenzo3 , D. Magestro1 , P.
Maier-Komor6 , C. Maiolino2 , J. Markert15 , V. Metag10 , M.
Muench6 , C. Muentz15 , L. Naumann9 , W. Niebur1 , W. Ott1 ,
J. Otwinowski4 , Y. Pachmayer15 , V. Pechenov8 , M. Petri10 ,
P. Piattelli2 , J. Pietraszko4 , R. Pleskac14 , M. Ploskon4 , W.
Prokopowicz4 , W. Przygoda4 , B. Ramstein7 , A. Reshetin11 ,
J. Ritman10 , K. Rosenkranz15 , P. Rosier7 , M. Roy-Stephan7 ,
J. Sabin Fernandez3 , B. Sailer6 , P. Salabura4 , C. Salz10 ,
M. Sanchez3 , P. Sapienza2 , C. Schroeder1 , J. Seibert9 , K.
Shileev11 , R.S. Simon1 , L. Smykov8 , S.Spataro2 , H. Stelzer1 ,
H. Stroebele15 , J. Stroth15 , A. Taranenko14 , V. Tiflov11 , A.
Titov8 , P. Tlusty14 , A. Toia10 , M. Traxler10 , H. Tsertos13 , I.
Turzo12 , V. Vassiliev2 , A. Vazquez3 , V. Wagner14 , W. Walus4 ,
Y. Wang15 , S. Winkler6 , J. Wuestenfeld15 , Yu. Zanevsky8 , D.
Zovinec1 ,andP. Zumbruch1 1Gesellschaft fuer Schwerionenforschung (GSI), Darmstadt, Germany
2Istituto Nazionale di Fisica Nucleare - LNS, Catania, Italy
3Depart.de Fisica de Particulas, Univ.of Santiago de Compostela, Spain
4Smoluchowski Inst.of Physics, Jagiellonian University of Cracow, Poland
5Istituto Nazionale di Fisica Nucleare, Milano, Italy
6Physik Department E12, Techn.Univ.Muenchen, Garching, Germany
7Institut de Physique Nucleaire d’Orsay, Orsay, France
8Joint Institute of Nuclear Research, Dubna, Russia
9Inst.fuer Kern- und Hadronenphysik, FZ Rossendorf, Dresden, Germany
10II.Physikalisches Institut, Justus Liebig Universitaet Gießen, Germany
11Institute for Nucl.Research, Russ.Academy of Science, Moscow, Russia
12Institute of Physics, Slovak Academy of Sciences, Bratislava, Slovakia
13Department of Natural Sciences, University of Cyprus, Nicosia, Cyprus
14Nuclear Physics Inst., Czech Academy of Sciences, Rez, Czech Republic
15Inst.fuer Kernphysik, Joh.Wolfgang Goethe Univ., Frankfurt, Germany
KaoS Collaboration
I.M. Böttcher1 , A. Förster2 , E. Grosse3,4 , P. Koczoń5 ,
B. Kohlmeyer1 , S. Lang2 , M. Menzel1 , L. Naumann3 , H.
Oeschler2 , M. P̷loskon5 , F. Pühlhofer1 , W. Scheinast3 , A.
Schmah2 , T. Schuck6 , E. Schwab5,6 , P. Senger5 , Y. Shin6 , H.
Ströbele6 , C. Sturm5,2 , F. Uhlig2 , A. Wagner3 ,andW. Walu´s 7
1Phillips-Universität, D-35037 Marburg
2Technische Universität, D-64289 Darmstadt
3Forschungszentrum Rossendorf, D-01474 Dresden
4Technische Universität, D-01062 Dresden
5Gesellschaft für Schwerionenforschung, D-64291 Darmstadt
6Johann Wolfgang Goethe-Universität, D-60054 Frankfurt
7Jagellonian University, PL-30-059 Kraków
KASCADE Collaboration
T. Antoni 1 , W.D. Apel 2 , F. Badea 1 , K. Bekk 2 , A. Bercuci 2 , H.
Blümer 2,1 , H. Bozdog 3 , I.M. Brancus 3 , C. Büttner 2 , A. Chilingarian
4 , K. Daumiller 1 , P. Doll 2 , J. Engler 2 , F. Feßler 1 ,
H.J. Gils 2 , R. Glasstetter 1 , R. Haeusler 1 , W. Hafemann 2 ,
A. Haungs 2 , D. Heck 2 , J.R. Hörandel 1 , T. Holst 2 , A. Iwan 1 ,
K.H. Kampert 1,2 , H.O. Klages 2 , J. Knapp 1 , G. Maier 2 , H.J.
Mathes 2 , H.J. Mayer 2 , J. Milke 1 , M. Müller 2 , R. Obenland 2 ,
J. Oehlschläger 2 , S.Ostapchenko 1 , M. Petcu 3 , H. Rebel 2 , M.
Risse 2 , M. Roth 2 , H. Schieler 2 , J. Scholz 2 , T. Thouw 2 , H. Ulrich
1 , B. Vulpescu 3 , J.H. Weber 1 , J. Wentz 2 , J. Wochele 2 , J.
Zabierowski 5 ,andS.Zagromski 2

1Institut für Experimentelle Kernphysik, University of Karlsruhe, 76021 Karlsruhe,
Germany
2Institut für Kernphysik, Forschungszentrum Karlsruhe, 76021 Karlsruhe,
Germany
3National Institute of Physics and Nuclear Engineering, 7690 Bucharest, Ro-
mania
4 Cosmic Ray Division, Yerevan Physics Institute, Yerevan 36, Armenia
5 Soltan Institute for Nuclear Studies, 90950 Lodz, Poland
KATRIN Collaboration
A. Osipowicz1 , H. Blümer2,3 , G. Drexlin2 , K. Eitel2 , G.
Meisel2 , P. Plischke2 , F. Schwamm2 , M. Steidl2 , A. Beglarian4 ,
H. Gemmeke4 , S.Wüstling4 , C. Day5 , R. Gehring5 , R. Heller5 ,
K.-P. Jüngst5 , P. Komarek5 , W. Lehmann5 , A. Mack5 , W. Maurer5
, H. Neumann5 , M. Noe5 , T. Schneider5 , B. Bornschein6 ,
L. Dörr6 , M. Glugla6 , R. Lässer6 , T. Kepcija3 , J. Wolf3 , J.
Bonn7 , L. Bornschein7 , B. Flatt7 , F. Glück7 , C. Kraus7 , B.
Müller7 , E. Otten7 , J.-P. Schall7 , T. Thümmler7 , C. Weinheimer8
, V. Aseev9 , A. Belesev9 , A. Berlev9 , E. Geraskin9 , A.
Golubev9 , O. Kazachenko9 , V. Lobashev9 , N. Titov9 , V. Usanov9
, S. Zadoroghny9 , O. Dragoun10 , J. Kaspar10 , A. Kovalik10
, M. Rysavy 10 , A. Spalek10 , D. Venos10 , P. Doe11 , S . Elliott11
, R. Robertson11 ,andJ. Wilkerson11 1FH Fulda, Marquardtstr.35, 36039 Fulda, Germany
2Forschungszentrum Karlsruhe, Institut für Kernphysik, Postfach 3640, 76021
Karlsruhe, Germany
3 Universität Karlsruhe, Institut für experimentelle Kernphysik, Gaedestr.1,
76128 Karlsruhe, Germany
4 Forschungszentrum Karlsruhe, Institut für Prozessdatenverarbeitung und
Elektronik, Postfach 3640, 76021 Karlsruhe, Germany
5 Forschungszentrum Karlsruhe, Institut für Technische Physik, Postfach 3640,
76021 Karlsruhe, Germany
6 Forschungszentrum Karlsruhe, Tritiumlabor Karlsruhe , Postfach 3640, 76021
Karlsruhe, Germany
7 Universität Mainz, Institut für Physik, 55099 Mainz, Germany
8 Universität Bonn, Institut für Strahlen- und Kernphysik, Nussallee 14-16,
53115 Bonn, Germany
9Academy of Sciences of Russia, Institute for Nuclear Research, Moscow, Russia
10Academy of Sciences of the Czech Republic, Nuclear Physics Institute,
Prague, Czech Republic
11University of Washington, Department of Physics, Seattle WA 98195, USA
LAND/S188/S233 Collaboration
P. Adrich 4 , T. Aumann 1 , K. Boretzky 2 , D. Cortina 1 , M. Csatlos
8 , U. Datta Pramanik 1 , Th.W. Elze 3 , H. Emling 1 , H. Geissel
1 , A. Grünschloß 3 , J. Gulyus 8 , M. Hellström 1 , S. Ilievski 1 ,
N. Iwasa 1 , K. Jones 1 , A. Krasznahorkay 8 , J.V. Kratz 2 , R. Kulessa
4 , T. Lange 3 , K. Le Hong 1 , Y. Leifels 1 , A. Leistenschneider
3 , E. Lubkiewicz 4 , G. Münzenberg 1 , R. Palit 3 , P. Reiter 5 ,
C. Scheidenberger 1 , H. Scheit 6 , H. Simon 7 , K. Sümmerer 1 , E.
Wajda 4 , W. Walus 4 ,andH. Weick 1
1Gesellschaft für Schwerionenforschung (GSI), Planckstr.1,D-64291 Darmstadt,
Germany
2Institut für Kernchemie, Johannes Gutenberg Universität, D-55099 Mainz,
Germany
3Institut für Kernphysik, Johann Wolfgang Goethe Universität,D-60486
Frankfurt, Germany
4 Instytut Fizyki, Uniwersytet Jagelloński, PL-30-059 Kraków, Poland
5 Sektion Physik, Ludwig Maximilian Universität, D-85748 Garching, Germany
6 Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg,
Germany
7Institut für Kernphysik, Technische Universität,D-64289 Darmstadt, Germany
8Institute of Nuclear Research of the Hungarian Academy of Sciences, H-4001
Debrecen, Hungary
LAND Collaboration
T. Aumann 1 , K. Boretzky 2 , D. Cortina 1 , U. Datta Pramanik 1 ,
Th.W. Elze 3 , H. Emling 1 , H. Geissel 1 , A. Grünschloß 3 , M.
Hellström 1 , S. Ilievski 1 , N. Iwasa 1 , K. Jones 1 , J.V. Kratz 2 , R.
Kulessa 4 , Y. Leifels 1 , A. Leistenschneider 3 , E. Lubkiewicz 4 ,
G. Münzenberg 1 , R. Palit 3 , P. Reiter 5 , C. Scheidenberger 1 ,
H. Simon 6 , K. Sümmerer 1 , E. Wajda 4 ,andW. Walus 4
Collaborations
1Gesellschaft für Schwerionenforschung (GSI), Planckstr.1,D-64291 Darmstadt,
Germany
2Institut für Kernchemie, Johannes Gutenberg Universität, D-55099 Mainz,
Germany
3Institut für Kernphysik, Johann Wolfgang Goethe Universität,D-60486
Frankfurt, Germany
4 Instytut Fizyki, Uniwersytet Jagelloński, PL-30-059 Kraków, Poland
5 Sektion Physik, Ludwig Maximilian Universität, D-85748 Garching, Germany
6 Institut für Kernphysik, Technische Universität,D-64289 Darmstadt, Ger-
many
LEPS Collaboration
R. Bilger 1 , B. van den Brandt 2 , J. Breitschopf 1 , H. Clement 1 ,
J. Comfort 3 , M. Cröni 1 , H. Denz 1 , A. Erhardt 1 , K. Föhl 4 ,
E. Friedman 5 , P. Hautle 2 , G.J. Hofman 6 , J.A. Konter 2 , S.
Mango 2 , R. Meier 1 , J. Pätzold 1 , M. Pavan 7 , G.J. Wagner 1 ,and
F. von Wrochem 1
1 Physikalisches Institut der Universität Tübingen, Auf der Morgenstelle 14,
72076 Tübingen, Germany
2 Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
3 Arizona State University, Tempe, AZ 85287, USA
4 Department of Physics and Astronomy, Univ.of Edinburgh, UK
5 Racah Institute of Physics, The Hebrew University, Jerusalem 91904, Israel
6 Nuclear Physics Laboratory, University of Colorado, Boulder, CO 80309, USA
7 TRIUMF, 4004 Wesbrook Mall, Vancouver BC, Canada, V6T 2A3
MINIBALL Collaboration
J. Eberth1 , J. Fitting2 , S. Franchoo3 , W. Gast4 , J. Gerl5 , D.
Habs6 , M. Huyse3 , K. Krouglov3 , M. Lauer2 , K.P. Lieb7 , R.M.
Lieder4 , A. Ostrowski8 , U. Pal2 , G. Pascovici1 , P. Reiter6 , H.
Scheit2 , D. Schwalm2 , P. Thirolf6 , H.G. Thomas1 , P. Van Duppen3
, J. VanRoosbroeck3 , N. Warr1 ,andD. Weisshaar1 1Institut für Kernphysik, Universität Köln
2Max-Planck-Institut für Kernphysik, Heidelberg
3Instituut voor Kern- en Stralingsfysica, Katholieke Universiteit Leuven
4Institut für Kernphysik, Foschungszentrum Jülich
5Gesellschaft für Schwerionenforschung (GSI), Darmstadt
6Ludwig-Maximilians-Universität München
7II.Physikalisches Institut, Universität Göttingen
8Institut für Kernchemie, Universität Mainz
NA49 Collaboration
S.V. Afanasiev9 , T. Anticic21 , D. Barna3 , J. Bartke7 , R.A.
Barton3 , L. Betev10 , H. Bia̷lkowska19 , A. Billmeier10 , C.
Blume8 , C.O. Blyth3 , B. Boimska19 , M. Botje1 , J. Bracinik4 ,
R. Bramm10 , R. Brun11 , P. Bunčić10,11 , V. Cerny4 , O. Chvala17 ,
J.G. Cramer18 , P. Csató5 , P. Dinkelaker10 , V. Eckardt16 ,
P. Filip16 , H.G. Fischer11 , Z. Fodor5 , P. Foka8 , P. Freund16 ,
V. Friese15 , J. Gál5 , M. Ga´zdzicki10 , G. Georgopoulos2 , E.
G̷ladysz7 , S . Hegyi5 , C. Höhne15 , G. Igo14 , P.G. Jones3 , K.
Kadija11,21 , A. Karev16 , V.I. Kolesnikov9 , T. Kollegger10 ,
M. Kowalski7 , I. Kraus8 , M. Kreps4 , M. van Leeuwen1 , P.
Lévai5 , A.I. Malakhov9 , S . Margetis13 , C. Markert8 , B.W.
Mayes12 , G.L. Melkumov9 , A. Mischke8 , J. Molnár5 , J.M. Nelson3
, G. Pálla5 , A.D. Panagiotou2 , K. Perl20 , A. Petridis2 ,
M. Pikna4 , L. Pinsky12 , F. Pühlhofer15 , J.G. Reid18 , R. Renfordt10
, W. Retyk20 , C. Roland6 , G. Roland6 , A. Rybicki7 ,
T. Sammer16 , A. Sandoval8 , H. Sann8 , N. Schmitz16 , P. Seyboth16
, F. Siklér5 , B. Sitar4 , E. Skrzypczak20 , G.T.A. Squier3 ,
R. Stock10 , H. Ströbele10 , T. Susa21 , I. Szentpétery5 , J. Sziklai5
, T.A. Trainor18 , D. Varga 5 , M. Vassiliou2 , G.I. Veres5 ,
G. Vesztergombi5 , D. Vranić8 , S. Wenig11 , A. Wetzler10 , C.
Whitten14 , I.K. Yoo15 , J. Zaranek10 ,andJ. Zimányi5 1NIKHEF, Amsterdam, Netherlands
2Department of Physics, University of Athens, Athens, Greece
3Birmingham University, Birmingham, England
4Comenius University, Bratislava, Slovakia
5KFKI Research Institute for Particle and Nuclear Physics, Budapest, Hungary
6MIT, Cambridge, USA
7Institute of Nuclear Physics, Cracow, Poland

8Gesellschaft für Schwerionenforschung (GSI), Darmstadt, Germany
9Joint Institute for Nuclear Research, Dubna, Russia
10Fachbereich Physik der Universität, Frankfurt, Germany
11CERN, Geneva, Switzerland
12University of Houston, Houston, TX, USA
13Kent State University, Kent, OH, USA
14University of California at Los Angeles, Los Angeles, USA
15Fachbereich Physik der Universität, Marburg, Germany
16Max-Planck-Institut für Physik, Munich, Germany
17Institute of Particle and Nuclear Physics, Charles University, Prague, Czech
Republic
18Nuclear Physics Laboratory, University of Washington, Seattle, WA, USA
19Institute for Nuclear Studies, Warsaw, Poland
20Institute for Experimental Physics, University of Warsaw, Warsaw, Poland
21Rudjer Boskovic Institute, Zagreb, Croatia
PHENIX Collaboration
K. Adcox 40 , S.S. Adler 3 , N. N. Ajitanand 27 , Y. Akiba 14 , J.
Alexander 27 , L. Aphecetche 34 , Y. Arai 14 , S.H. Aronson 3 ,
R. Averbeck 28 , T. C. Awes 29 , K. N. Barish 5 , P. D. Barnes 19 ,
J. Barrette 21 , B. Bassalleck 25 , S . Bathe 22 , V. Baublis 30 ,
A. Bazilevsky 12,32 , S. Belikov 12,13 , F. G. Bellaiche 29 , S.T.
Belyaev 16 , M. J. Bennett 19 , Y. Berdnikov 35 , S . Botelho 33 ,
M. L. Brooks 19 , D. S. Brown 26 , N. Bruner 25 , D. Bucher 22 ,
H. Buesching 22 , V. Bumazhnov 12 , G. Bunce 3,32 , J. Burward-
Hoy 28 , S . Butsyk 28,30 , T. A. Carey 19 , P. Chand 2 , J. Chang 5 ,
W. C. Chang 1 , L. L. Chavez 25 , S. Chernichenko 12 , C. Y. Chi 8 , J.
Chiba 14 , M. Chiu 8 , R. K. Choudhury 2 , T. Christ 28 , T. Chujo 3,39 ,
M. S. Chung 15,19 , P. Chung 27 , V. Cianciolo 29 , B. A. Cole 8 , D. G.
D’Enterria 34 , G. David 3 , H. Delagrange 34 , A. Denisov 12 , A.
Deshpande 32 , E. J. Desmond 3 , O. Dietzsch 33 , B. V. Dinesh 2 ,
A. Drees 28 , A. Durum 12 , D. Dutta 2 , K. Ebisu 24 , Y. V. Efremenko
29 , K. El Chenawi 40 , H. En’yo 17,31 , S.Esumi 39 , L. Ewell 3 ,
T. Ferdousi 5 , D. E. Fields 25 , S. L. Fokin 16 , Z. Fraenkel 42 , A.
Franz 3 , A. D. Frawley 9 , S. -Y. Fung 5 , S. Garpman 20 , T. K.
Ghosh 40 , A. Glenn 36 , A. L. Godoi 33 , Y. Goto 32 , S. V. Greene 40 ,
M. Grosse Perdekamp 32 , S.K. Gupta 2 , W. Guryn 3 , H. -˚A.
Gustafsson 20 , J. S. Haggerty 3 , H. Hamagaki 7 , A. G. Hansen 19 ,
H. Hara 24 , E. P. Hartouni 18 , R. Hayano 38 , N. Hayashi 31 , X. He 10 ,
T. K. Hemmick 28 , J. M. Heuser 28 , M. Hibino 41 , J. C. Hill 13 , D. S.
Ho 43 , K. Homma 11 , B. Hong 15 , A. Hoover 26 , T. Ichihara 31,32 ,
K. Imai 17,31 , M. S. Ippolitov 16 , M. Ishihara 31,32 , B. V. Jacak 28,32 ,
W. Y. Jang 15 , J. Jia 28 , B. M. Johnson 3 , S. C. Johnson 18,28 , K. S.
Joo 23 , S. Kametani 41 , J. H. Kang 43 , M. Kann 30 , S. S. Kapoor 2 , S.
Kelly 8 , B. Khachaturov 42 , A. Khanzadeev 30 , J. Kikuchi 41 , D. J.
Kim 43 , H. J. Kim 43 , S.Y. Kim 43 , Y. G. Kim 43 , W. W. Kinnison 19 , E.
Kistenev 3 , A. Kiyomichi 39 , C. Klein-Boesing 22 , S. Klinksiek 25 ,
L. Kochenda 30 , V. Kochetkov 12 , D. Koehler 25 , T. Kohama 11 , D.
Kotchetkov 5 , A. Kozlov 42 , P. J. Kroon 3 , K. Kurita 31,32 , M. J.
Kweon 15 , Y. Kwon 43 , G. S. Kyle 26 , R. Lacey 27 , J. G. Lajoie 13 , J.
Lauret 27 , A. Lebedev 13,16 , D. M. Lee 19 , M. J. Leitch 19 , X. H. Li 5 ,
Z. Li 6,31 , D. J. Lim 43 , M. X. Liu 19 , X. Liu 6 , Z. Liu 6 , C. F. Maguire 40 ,
J. Mahon 3 , Y. I. Makdisi 3 , V. I. Manko 16 , Y. Mao 6,31 , S.K.
Mark 21 , S . Markacs 8 , G. Martinez 34 , M. D. Marx 28 , A. Masaike
17 , F. Matathias 28 , T. Matsumoto 7,41 , P. L. McGaughey 19 ,
E. Melnikov 12 , M. Merschmeyer 22 , F. Messer 28 , M. Messer 3 , Y.
Miake 39 , T. E. Miller 40 , A. Milov 42 , S. Mioduszewski 3,36 , R. E.
Mischke 19 , G. C. Mishra 10 , J. T. Mitchell 3 , A. K. Mohanty 2 ,
D. P. Morrison 3 , J. M. Moss 19 , F. Mühlbacher 28 , M. Muniruzzaman
5 , J. Murata 31 , S.Nagamiya 14 , Y. Nagasaka 24 , J. L. Nagle
8 , Y. Nakada 17 , B. K. Nandi 5 , J. Newby 36 , L. Nikkinen 21 ,
P. Nilsson 20 , S . Nishimura 7 , A. S. Nyanin 16 , J. Nystrand 20 ,
E. O’Brien 3 , C. A. Ogilvie 13 , H. Ohnishi 3,11 , I. D. Ojha 4,40 , M.
Ono 39 , V. Onuchin 12 , A. Oskarsson 20 , L. Österman20 , I. Otterlund
20 , K. Oyama 7,38 , L. Paffrath 3 , A. P. T. Palounek 19 , V. S.
Pantuev 28 , V. Papavassiliou 26 , S.F. Pate 26 , T. Peitzmann 22 ,
A. N. Petridis 13 , C. Pinkenburg 3,27 , R. P. Pisani 3 , P. Pitukhin 12 ,
F. Plasil 29 , M. Pollack 28,36 , K. Pope 36 , M. L. Purschke 3 , I.
Ravinovich 42 , K. F. Read 29,36 , K. Reygers 22 , V. Riabov 30,35 , Y.
Riabov 30 , M. Rosati 13 , A. A. Rose 40 , S.S. Ryu 43 , N. Saito 31,32 ,
A. Sakaguchi 11 , T. Sakaguchi 7,41 , H. Sako 39 , T. Sakuma 31,37 , V.
Samsonov 30 , T. C. Sangster 18 , R. Santo 22 , H. D. Sato 17,31 , S.
Sato 39 , S.Sawada 14 , B. R. Schlei 19 , Y. Schutz 34 , V. Semenov 12 ,
Collaborations
R. Seto5 , T. K. Shea3 , I. Shein12 , T. -A. Shibata31,37 , K. Shigaki14 ,
T. Shiina19 , Y. H. Shin43 , I. G. Sibiriak16 , D. Silvermyr20 , K. S.
Sim15 , J. Simon-Gillo19 , C. P. Singh4 , V. Singh4 , M. Sivertz3 ,
A. Soldatov 12 , R. A. Soltz18 , S.Sorensen29,36 , P. W. Stankus29 ,
N. Starinsky21 , P. Steinberg8 , E. Stenlund20 , A. Ster44 , S.P.
Stoll3 , M. Sugioka31,37 , T. Sugitate11 , J. P. Sullivan19 , Y.
Sumi11 , Z. Sun6 , M. Suzuki39 , E. M. Takagui33 , A. Taketani31 , M.
Tamai 41 , K. H. Tanaka14 , Y. Tanaka24 , E. Taniguchi31,37 , M. J.
Tannenbaum3 , J. Thomas28 , J. H. Thomas18 , T. L. Thomas25 , W.
Tian6,36 , J. Tojo17,31 , H. Torii17,31 , R. S. Towell19 , I. Tserruya42 ,
H. Tsuruoka39 , A. A. Tsvetkov16 , S.K. Tuli4 , H. Tydesjö20 ,
N. Tyurin12 , T. Ushiroda24 , H. W. van Hecke19 , C. Velissaris26
, J. Velkovska28 , M. Velkovsky28 , A. A. Vinogradov16 ,
M. A. Volkov16 , A. Vorobyov30 , E. Vznuzdaev30 , H. Wang5 ,
Y. Watanabe31,32 , S.N. White3 , C. Witzig3 , F. K. Wohn13 , C. L.
Woody3 , W. Xie5,42 , K. Yagi39 , S. Yokkaichi31 , G. R. Young29 ,
I. E. Yushmanov16 , W. A. Zajc8 , Z. Zhang28 ,andS.Zhou6 1Institute of Physics, Academia Sinica, Taipei 11529, Taiwan
2Bhabha Atomic Research Centre, Bombay 400 085, India
3Brookhaven National Laboratory, Upton, NY 11973-5000, USA
4Department of Physics, Banaras Hindu University, Varanasi 221005, India
5University of California - Riverside, Riverside, CA 92521, USA
6China Institute of Atomic Energy (CIAE), Beijing, People’s Republic of
China
7Center for Nuclear Study, Graduate School of Science, University of Tokyo,
7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
8Columbia University, New York, NY 10027 and Nevis Laboratories, Irvington,
NY 10533, USA
9Florida State University, Tallahassee, FL 32306, USA
10Georgia State University, Atlanta, GA 30303, USA
11Hiroshima University, Kagamiyama, Higashi-Hiroshima 739-8526, Japan
12Institute for High Energy Physics (IHEP), Protvino, Russia
13Iowa State University, Ames, IA 50011, USA
14KEK, High Energy Accelerator Research Organization, Tsukuba-shi,
Ibaraki-ken 305-0801, Japan
15Korea University, Seoul, 136-701, Korea
16Russian Research Center ”Kurchatov Institute”, Moscow, Russia
17Kyoto University, Kyoto 606, Japan
18Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
19Los Alamos National Laboratory, Los Alamos, NM 87545, USA
20Department of Physics, Lund University, Box 118, SE-221 00 Lund, Sweden
21McGill University, Montreal, Quebec H3A 2T8, Canada
22Institut für Kernphysik, University of Münster, D-48149 Münster, Germany
23Myongji University, Yongin, Kyonggido 449-728, Korea
24Nagasaki Institute of Applied Science, Nagasaki-shi, Nagasaki 851-0193,
Japan
25University of New Mexico, Albuquerque, NM 87131, USA
26New Mexico State University, Las Cruces, NM 88003, USA
27Chemistry Department, State University of New York - Stony Brook, Stony
Brook, NY 11794, USA
28 Department of Physics and Astronomy, State University of New York - Stony
Brook, Stony Brook, NY 11794, USA
29 Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
30 PNPI, Petersburg Nuclear Physics Institute, Gatchina, Russia
31 RIKEN (The Institute of Physical and Chemical Research), Wako, Saitama
351-0198, JAPAN
32RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, NY
11973-5000, USA
33Universidade de São Paulo, Instituto de Física, Caixa Postal 66318, São
Paulo CEP05315-970, Brazil
34SUBATECH (Ecole des Mines de Nantes, IN2P3/CNRS, Universite de
Nantes) BP 20722 - 44307, Nantes-cedex 3, France
35St.Petersburg State Technical University, St.Petersburg, Russia
36University of Tennessee, Knoxville, TN 37996, USA
37Department of Physics, Tokyo Institute of Technology, Tokyo, 152-8551,
Japan
38University of Tokyo, Tokyo, Japan
39Institute of Physics, University of Tsukuba, Tsukuba, Ibaraki 305, Japan
40Vanderbilt University, Nashville, TN 37235, USA
41Waseda University, Advanced Research Institute for Science and Engineering,
17 Kikui-cho, Shinjuku-ku, Tokyo 162-0044, Japan
42Weizmann Institute, Rehovot 76100, Israel
43Yonsei University, IPAP, Seoul 120-749, Korea
44KFKI Research Institute for Particle and Nuclear Physics (RMKI), Bu-
dapest, Hungary

PROMICE/WASA Collaboration
R. Bilger1 , M. Blom2 , D. Bogoslawsky3 , A. Bondar4 , W.
Brodowski1 , H. Cálen2 , B. Chernyshev5 , I. Chuvilo6 , H.
Clement1 , S. Dahlgren2 , A. David2 , E. Dorochkevitch1 , V.
Dunin3 , J. Dyring2 , C. Ekstr”om7 , K. Fransson2 , C.-J. Friden7 ,
M. Gornov5 , V. Grebenv5 , J. Greiff8 , M. Gurov5 , L. Gustafsson2
, S. H”aggstr”om2 , H. Hirabayashi 9 , B. H”oistad2 , H.
Ikegami10 , A. Jansson2 , J. Johanson2 , A. Johansson2 , T. Johansson2
, K. Kilian11 , G. Kolachev4 , M. Komgorov3 , L.
Komgorova 3 , L. Kondratyuk6 , S. Kullander2 , A. Kup´sć 12 ,
A. Kuzmin4 , A. Kuznetsov3 , P. Marciniewski12 , A. Martemyanov6
, R. Meier1 , Y. Mizuno10 , B. Morosov3 , A. M”ortsell2 ,
A. Nawrot12 , W. Oelert11 , J. P”atzold1 , Z. Pawlowski12 ,
A. Povtorejko3 , T. Purlatz4 , D. Reistad7 , R. Ruber2 , S.
Sandukovsky3 , M. Schepkin6 , W. Scobel8 , T. Sefzick11 , R.
Shafigulin5 , B. Shwartz4 , V. Sidorov4 , T. Skorodko1 , V.
Sopov6 , J. Stepaniak12 , A. Suchanov4 , A. Sukhanov3 , V. Tchernyshev6
, V. Tikhomirov3 , A. Turowiecki13 , G.J. Wagner1 , Z.
Wilhelmi13 , A. Yamamoto9 , H. Yamaoka9 , Y. Yuasa10 , J. Zabierowski14
, A. Zernov3 ,andJ. Zlomanczuk2 1Physikalisches Institut, Auf der Morgenstelle 14, D-72076 T”ubingen
2Department of Radiation Sciences, Univ.Uppsala, Uppsala, Sweden
3Joint Institute for Nuclear Research, Dubna, Russia
4Institute of Nuclear Physics, Novosibirsk, Russia
5Moscow Engineering Physics Institute, Moscow, Russia
6Institute for Theoretical and Experimental Physics, Moscow, Russia
7The Svedberg Laboratory, Univ.Uppsala, Uppsala, Sweden
8I.Institut f”ur Experimentalphysik der Univ.Hamburg
9National Laboratory for High Energy Physics, Tsukuba, Japan
10Research Centre for Nuclear Physics, Osaka, Japan
11Institut f”ur Kernphysik, Forschungszentrum J”ulich, D-52405 J”ulich
12Institute of Nuclear Studies, Warsaw, Poland
13Institute of Experimental Physics, Warschau, Poland
14Institute of Nuclear Studies, Lodz, Poland
REX-ISOLDE Collaboration
D. Habs1 , O. Kester1 , T. Sieber1 , S . Emhofer1 , M. Schumann1
, P. Reiter1 , P. Thirolf1 , H. Bongers1 , K. Rudolph1 , F.
Ames1 , K. Reisinger1 , J. Äystö2 , T. Nilsson2 , J. Cerderkall2 ,
O. Forstner2 , F. Wenander2 , L. Weismann2 , H. Fynbo2 , U.
Bergmann2 , G. Huber3 , B. Wolf3 , S. Franchoo3 , R. von
Hahn4 , R. Repnow4 , D. Schwalm4 , H. Scheit4 , J. Fitting4 ,
U. Pal4 , L. Liljeby5 , B. Jonsson6 , G. Nyman6 , K. Markenroth6
, A. Schempp7 , U. Ratzinger7 , P. van Duppen8 , M. Huyse8 ,
P. van den Bergh8 , G. Walter9 , A. Huck9 , A. Shotter10 ,
A. Ostrowski10 , T. Davinson10 , P.J. Woods10 , A. Richter11 ,
G. Shrieder11 , M. Pantea11 , H. Simon11 , O. Tengblad12 , J.
Eberth13 , N. Warr13 , D. Weisshaar13 ,andJ. Zylicz14 1LMU München, Am Coulombwall 1, D-85748 Garching
2CERN, CH-1211 Geneva 23, Switzerland
3Johannes-Gutenberg-Universität, D-55099 Mainz
4MPI für Kernphysik, Postfach 103980, D-69029 Heidelberg
5MSL, Frescativägen 24, S-10405 Stockholm, Sweden
6Chalmers University of Technology, Gothenburg, Sweden
7Universität Frankfurt, Robert-Mayer-Str.2-4, D-60325 Frankfurt
8K.U. Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium
9Universite Louis Pasteur, 23 R.du Loess, F-67037 Strasbourg, France
10University of Edinburgh, GB-Edinburgh EH9 3JZ, Scotland
11TU Darmstadt, Schlossgartenstr.9, D-64289 Darmstadt
12CSIC, C/Serrano 121, E-28006 Madrid, Spain
13Institut für Kernphysik, Universität Köln
14ZSJ, Warsaw University, PL-02-093 Warsaw
Rhone-Neckar-Flow Collaboration
Kai Schwenzer 1 , Jochen Meyer 1 , Hans-Juergen Pirner 1 ,and
Aldo Deandrea 2
1Institut fuer Theoretische Physik, Universitaet Heidelberg, Philosophenweg
19, 69120 Heidelberg
2Institut de Physique Nucleaire, Batiment Paul Dirac, universite Claude
Bernard Lyon I, 43, bd du 11 Novembre 1918, 69622 Villeurbanne Cedex,
France
S174 Collaboration
Collaborations
F. Aksouh1 , A. Bleile1 , O.V. Bochkarev2 , L.V. Chulkov2 , D.
Cortina-Gil3 , A.V. Dobrovolsky4 , P. Egelhof1 , H. Geissel1 ,
M. Hellström1 , N.B. Isaev4 , O.A. Kisselev1,4 , B.G. Komkov4 ,
M. Mátos1 , F.V. Moroz4 , G. Münzenberg1 , M. Mutterer5 , V.A
Mylnikov4 , S.F. Neumaier1 , V.N. Pribora2 , D.M. Seliverstov4 ,
L.O. Sergueev4 , A. Shrivastava 1 , K. Sümmerer1 , H. Weick1 , M.
Winkler1 ,andV.I. Yatsoura4 1Gesellschaft für Schwerionenforschung (GSI), D-64291 Darmstadt, Germany
2Russian Research Centre “Kurchatov Institute”, R-123182 Moscow, Russia
3Depto.de Fisica de Particulas, Universidade de Santiago de Compostela,
E-15706 Santiago de Compostela, Spain
4Petersburg Nuclear Physics Institute, 188350 St.Petersburg, Russia
5Institut für Kernphysik, Technische Universität, D-64289 Darmstadt, Ger-
many
WA98 Collaboration
M.M. Aggarwal 4 , A.L.S. Angelis7 , V. Antonenko13 , V. Arefiev6
, V. Astakhov6 , V. Avdeitchikov6 , T.C. Awes16 , P.V.K.S.
Baba10 , S.K. Badyal10 , S.Bathe14 , B. Batiounia6 , T. Bernier15 ,
K.B. Bhalla9 , V.S. Bhatia4 , C. Blume14 , D. Bucher14 , H.
Büsching14 , L. Carlén12 , S. Chattopadhyay 2 , M.P. Decowski3 ,
H. Delagrange15 , P. Donni7 , M.R. Dutta Majumdar2 , K. El
Chenawi12 , A.K. Dubey1 , K. Enosawa 18 , S. Fokin13 , V. Frolov6 ,
M.S. Ganti2 , S. Garpman12 , O. Gavrishchuk6 , F.J.M. Geurts19 ,
T.K. Ghosh8 , R. Glasow14 , B. Guskov6 , H.˚A. Gustafsson12 , H.
H.Gutbrod5 , I. Hrivnacova 17 , M. Ippolitov13 , H. Kalechofsky7
, K. Karadjev13 , K. Karpio20 , B.W. Kolb5 , I. Kosarev6 ,
I. Koutcheryaev13 , A. Kugler17 , P. Kulinich3 , M. Kurata18 ,
A. Lebedev13 , H. Löhner8 , L. Luquin15 , D.P. Mahapatra1 , V.
Manko13 , M. Martin7 , G. Martínez15 , A. Maximov6 , Y. Miake18 ,
G.C. Mishra1 , B. Mohanty1 , M.-J. Mora15 , D. Morrison11 , T.
Mukhanova13 , D.S. Mukhopadhyay 2 , H. Naef7 , B.K. Nandi1 ,
S.K. Nayak10 , T.K. Nayak2 , A. Nianine13 , V. Nikitine6 , S.Nikolaev6
, P. Nilsson12 , S . Nishimura18 , P. Nomokonov6 , J. Nystrand12
, A. Oskarsson12 , I. Otterlund12 , T. Peitzmann14 , D.
Peressounko13 , V. Petracek17 , S.C. Phatak1 , W. Pinganaud15 ,
F. Plasil16 , M.L. Purschke5 , J. Rak17 , R. Raniwala9 , S. Raniwala
9 , N.K. Rao10 , F. Retiere15 , K. Reygers14 , G. Roland3 ,
L. Rosselet7 , I. Roufanov6 , C. Roy15 , J.M. Rubio7 , S.S. Sambyal10
, R. Santo14 , S.Sato18 , H. Schlagheck14 , H.-R. Schmidt5 ,
Y. Schutz15 , G. Shabratova 6 , T.H. Shah10 , I. Sibiriak13 , T.
Siemiarczuk20 , D. Silvermyr12 , B.C. Sinha2 , N. Slavine6 , K.
Söderström12 , G. Sood4 , S.P. Sørensen11 , P. Stankus16 , G. Stefanek20
, P. Steinberg3 , E. Stenlund12 , M. Sumbera17 , T. Svensson12
, A. Tsvetkov13 , L. Tykarski20 , E.C.v.d. Pijll19 , N.v. Eijndhoven19
, G.J.v. Nieuwenhuizen3 , A. Vinogradov13 , Y.P.
Viyogi2 , A. Vodopianov6 , S.Vörös7 , B. Wys̷louch3 ,andG.R.
Young16 1Institute of Physics, Bhubaneswar 751005, India
2Variable Energy Cyclotron Centre, Calcutta 700064, India
3MIT Cambridge, MA 02139
4University of Panjab, Chandigarh 160014, India
5Gesellschaft für Schwerionenforschung (GSI), D-64220 Darmstadt, Germany
6Joint Institute for Nuclear Research, RU-141980 Dubna, Russia
7University of Geneva, CH-1211 Geneva 4, Switzerland
8KVI, University of Groningen, NL-9747 AA Groningen, The Netherlands
9University of Rajasthan, Jaipur 302004, Rajasthan, India
10University of Jammu, Jammu 180001, India
11University of Tennessee, Knoxville, Tennessee 37966, USA
12University of Lund, SE-221 00 Lund, Sweden
13RRC “Kurchatov Institute”, RU-123182 Moscow
14University of Münster, D-48149 Münster, Germany
15SUBATECH, Ecole des Mines, Nantes, France
16Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6372, USA
17Nuclear Physics Institute, CZ-250 68 Rez, Czech Rep.
18University of Tsukuba, Ibaraki 305, Japan
19Universiteit Utrecht/NIKHEF, NL-3508 TA Utrecht, The Netherlands
20Institute for Nuclear Studies, 00-681 Warsaw, Poland
9405+9406+9701 Collaboration
Ricardo Alarcon 1 , Wim van Amersfoort 2 , Thomas Bauer 3 ,
Henk Blok 2,4 , David Boersma 3 , Tancredi Botto 2 , Jo van

den Brand 2,4 , Henk Bulten 2,4 , Laurens van Buuren 2 , Gail
Dodge 5 , Rolf Ent 6,7 , Massi Ferro-Luzzi 2,8 , Dennis Geurts 2,4 ,
David Groep 2 , Mark Harvey 6,7 , Peter Heimberg 2 , Willem
Hesselink 2,4 , Doug Highinbotham 9 , Kees de Jager 2,6 , Eddy
Jans 2 , Tjeerd Ketel 2,4 , P. Klimin 10 , Ivan Koop 10 , Frans Kroes 2 ,
Sander Klous 2 , Hauke Kolster 2 , Jan van der Laan 2 , Juerg
Lang 8 , Dirk Jan de Lange 2 , Louk Lapik’as 2 , Guy Luijckx 2 , A.
Lysynko 10 , Boris Militsyn 2 , Ivan Nesterenko 2 , Jaap Noomen 2 ,
Blaine Norum 9 , Igor Passchier 2 , Valeri Pugatch 11 , Mark
van der Putte 2 , Hans Roeland Poolman 2,4 , Marcel van
Sambeek 2,4 , Yuri Shatunov 10 , Chiara Simani 2 , Ed Six 1 , Martijn
Steenbakkers 2 , Jos Steijger 2 , Dominique Szczerba 8 , L.
Todor 5 , Paul Ulmer 5 , Hans de Vries 2 , Kevin Wang 9 ,andZi-Lu
Zhou 2,12
Collaborations
1Arizona State University, Tempe, Arizona 85287
2NIKHEF, P.O. Box 41882, 1009 DB Amsterdam the Netherlands
3Rijks Universiteit Utrecht, 3508 TA Utrecht, The Netherlands
4Vrije Universiteit, 1081 HV Amsterdam, The Netherlands
5Old Dominion University, Norfolk, Virginia 23529
6TJNAF, Newport News, Virginia 23606
7Hampton University, Hampton, Virginia 23668
8Eidgenossische Technische Hochshule, CH-8093 Zuerich, Switzerland
9University of Virginia, Charlottesville, Virginia 22901
10Budker Institut for Nuclear Physics, Novosibirsk, 630090, Russian Federation
11Ukrainian academy of Sciences, Kiev, Ukraine
12University of Wisconsin, Madison, Wisconsin 53705

9405+9406+9701 - Collaboration
HK 22.2
A1 - Collaboration ..........HK 12.30
A2 - Collaboration . .HK 26.1, HK 26.4
A4 - Collaboration HK 14.8, HK 14.9,
HK 14.10, HK 14.12, HK 21.3
Abdel-Bary, M. ..............HK 42.2
Abdel-Samad, S. .............HK 42.2
Ackermann, D. ...............HK 7.3
Adam, H.-H. ...............HK 12.25
Adamian, G. G. HK 10.18, HK 10.19,
HK 17.6
Adelberger, E. G. ............HK 25.1
Adler, Clemens ......HK 6.4, HK 34.3
Agakichiev, H. ...............HK 14.6
Akimune, H. ..................HK 3.4
ALADIN-INDRA - Collaboration
HK 13.3, HK 13.4, HK 47.2
ALICE TRD - Collaboration . . HK 34.2
ALICE-TRD - Collaboration HK 14.26,
HK 41.2
Altarev, Igor ..........HK 7.1, HK 7.4
Altenburg, Denis . ..........HK 12.15
Alvarez-Pol, H. ..............HK 14.6
Ames, F. ....................HK 17.2
Amir Ahmadi, H. ...........HK 10.34
Amir-Ahmadi, H. ...........HK 12.33
Amro, H. ........HK 10.10, HK 10.11
Anagnostopoulos, D. F. ......HK 26.6
Andrejtscheff, Ventseslav .....HK 10.7
Andronic, A. ................HK 13.5
Andronic, Anton .............HK 20.1
Angerer, H. ................. HK 28.1
ANKE - Collaboration . . . . HK 5.9,
HK 12.22, HK 14.30, HK 22.1,
HK 42.3, HK 46.3, HK 46.6
Antiproton Physics Study Group -
Collaboration HK 12.1, HK 12.4,
HK 12.6, HK 12.7, HK 34.1
AntiprotoPhysics Study Group -
Collaboration ...........HK 12.5
Antonenko, N. V. HK 10.18, HK 10.19,
HK 17.6
Aouissat, Zoheir .............HK 9.22
Appelshaeuser, H. ..........HK 14.24
Appelshäuser, Harald . . . .HK 33.5,
HK 41.5
Aprahamian, A. ..............HK 10.8
Ardid, M. ...................HK 13.5
Arellano, Hugo ..............HK 43.5
Arenhövel, Hartmuth . . . .HK 9.26,
HK 37.4
Assunção, M. ................HK 25.5
ATRAP - Collaboration ......HK 31.4
Attallah, F. ...................HK 7.3
Audi, G. .....................HK 17.2
Augustinski, Gerd ............HK 41.1
Axiotis, M. . . . HK 10.5, HK 10.11,
HK 45.4
Ay, C. ............HK 14.11, HK 21.4
Azzam, A. .................HK 14.13
BABAR - Collaboration . . HK 12.14,
HK 12.15, HK 12.16, HK 19.1,
HK 19.2, HK 49.2
Babilon, M. . . HK 10.26, HK 10.27,
HK 18.2, HK 18.3, HK 18.4
Bacelar, J. .................HK 12.32
Bacelar, J. C.S. . . HK 10.34, HK 12.33
Backe, H. HK 7.3, HK 14.11, HK 21.4
Bäumer, C. . . . .HK 7.7, HK 10.15,
HK 10.16, HK 24.4
Baeßler, S. .................HK 10.23
Baeßler, S. .................HK 10.21
Balabanski, Dimiter ..........HK 45.3
Balanutsa, V. ..............HK 14.30
Balewski, J. T. ..............HK 42.4
Banerjee, P. ................HK 10.13
Banu, A. ....................HK 13.5
Baran, Virgil ................ HK 47.5
Barneo, P. J. ................HK 32.4
Barnes, T. ...................HK 12.3
Barsov, S. ...................HK 46.3
Barth, Jens ..................HK 32.5
Barton, C. J. ................HK 10.8
Barz, H. W. .................HK 13.9
Bathe, Stefan .................HK 6.7
Baunack, Sebastian ..........HK 14.8
Bax, H. ....................HK 10.32
Bayansan, Davaadorj .........HK 43.5
Bayer, W. ..........HK 18.2, HK 18.4
Bazzacco, D. . . . HK 3.3, HK 10.2,
HK 10.11, HK 10.17, HK 39.4
Beausang, C. W. . . HK 10.8, HK 10.27
Beck, C. ...........HK 25.5, HK 45.4
Beck, D. ............HK 7.3, HK 17.2
Becker, F. ...................HK 30.4
Becker, J. ..................HK 10.32
Beijers, J. P.M. ..............HK 42.1
Beinhauer, W. . . . . HK 14.35, HK 21.5
Beisert, Niklas ...............HK 23.5
Belic, D. HK 10.3, HK 10.4, HK 30.5,
HK 39.3
Bellemann, F. ................HK 5.7
Bemmerer, Daniel ...........HK 11.5
Benczer-Koller, N. . .HK 30.3, HK 31.2
Bender, M. ...................HK 3.8
Bengtsson, R. ...............HK 39.4
Berg, A. ......................HK 5.7
Berg, G. P. .................HK 14.19
Berger, Jens .........HK 6.4, HK 34.3
Berlich, Rüdiger .............HK 34.4
Betev, L. .HK 6.2, HK 13.6, HK 13.7,
HK 33.2, HK 33.3, HK 41.4
Betev, Latchezar .............HK 33.4
Bettoni, D. ..................HK 12.3
Beyer, Michael ..............HK 9.28
Bhattacharya, S. . . HK 10.11, HK 39.2
Bhowmik, R. ...............HK 10.11
Bieber, R. .......HK 10.16, HK 10.30
Bielcik, Jaroslav .............HK 13.1
Billmeier, A. HK 6.2, HK 13.6, HK 33.2
Bisplinghoff, J. ......HK 5.7, HK 28.4
Blaschke, David .............HK 11.1
Blasi, N. HK 3.4, HK 10.15, HK 10.16,
HK 24.2, HK 39.1
Blaum, K. ...................HK 17.2
Blume, C. HK 6.2, HK 13.6, HK 13.7,
HK 33.2, HK 33.3, HK 41.4
Blume, Christoph ............HK 33.4
Bödeker, Dietrich ............HK 35.2
Börner, H. G. ................HK 45.5
Bohlen, H. G. ...............HK 45.4
Bohlscheid, G. ................HK 5.7
Boie, Hans ..................HK 45.6
Bollen, G. ...................HK 17.2
Bolster, E. L. .................HK 7.7
Bongers, Henning ...........HK 14.20
Bonn, Jochen ....HK 4.2, HK 4.6,
HK 11.4
Borasoy, Bugra . . . . . HK 19.6, HK 23.5
Borasoy, Bu¯gra .......HK 9.7, HK 9.8
Borghini, Nicolas ............HK 33.4
Borgs, W. ..................HK 14.30
Borisov, Y. .................HK 10.23
Bornschein, Beate . . . HK 4.6, HK 11.4
Bornschein, Lutz ....HK 4.6, HK 11.4
borremans, dana .............HK 45.3
Botvina, Alexandre ..........HK 47.6
Bouhali, Othmane ...........HK 28.3
Bramm, R. HK 6.2, HK 13.6, HK 13.7,
HK 33.2, HK 41.4
Bramm, Roland ....HK 33.3, HK 33.4
Brandenburg, S. . HK 3.4, HK 10.14,
HK 42.1
Braun, Vladimir . . . . HK 29.1, HK 29.4
Braun-Munzinger, Peter . . HK 20.1,
HK 41.1
Bravina, Larissa .............HK 27.1
Breitschopf, J. ...............HK 46.5
Breitschopf, Johannes ........HK 46.4
Brentano, P. v. ..............HK 10.4
Breunlich, W. ...............HK 26.6
Bringel, P. ........HK 10.11, HK 39.2
Brooke, J. A. .................HK 7.7
Brose, Jens ..................HK 19.2
Brunken, M. ......HK 14.35, HK 21.5
Buballa, Michael . . . . HK 2.5, HK 16.6
Bucher, Damian ............HK 14.26
Buchmann, L. ...............HK 25.1
Bürvenich, T. .................HK 3.8
Bürvenich, Thomas ..........HK 29.5
Büscher, M. . . HK 12.22, HK 14.30,
HK 22.1
Büsching, Henner .............HK 6.3
Bukharov, A. ...............HK 14.30
Bulten, Henk ................HK 22.2
Buncic, P. HK 6.2, HK 13.6, HK 13.7,
HK 33.2, HK 33.3, HK 41.4
Buncic, Predrag .............HK 33.4
Burau, Gerhard ..............HK 11.1
Busch, O. ...................HK 13.5
Busch, Oliver ................HK 34.2
Busch, P. .....................HK 7.7
Byrne, J. ...................HK 10.21
Calabrese, R. ................HK 12.3
Camen, Marcus ..............HK 26.1
Caprio, M. ..................HK 10.8
Carrol, J. J. .................HK 39.3
Carter, J. ..................HK 10.28
Casandjian, J. M. ............HK 25.1
Cassing, W. .................HK 12.3
Cassing, Wolfgang ...........HK 9.15
Castelijns, R. ....HK 10.34, HK 12.33
Castelijns, Ralph ............HK 12.32
Casten, R. F. ........HK 3.1, HK 10.8
Casten, Richard F. ............HK 1.2
Caurier, E. ..................HK 30.2
CB-ELSA - Collaboration . HK 12.28,
HK 12.29, HK 40.2, HK 40.3,
HK 40.4
CELSIUS/WASA - Collaboration
HK 40.5
CERES- Collaboration . . HK 14.24,
HK 33.5
CERES/NA45 - Collaboration HK 41.3,
HK 47.3
CERN-ISOLDE - Collaboration
HK 10.22
CHAOS- Collaboration ......HK 46.4
Chernetsky, V. ..............HK 14.30
Chernyshov, V. . . HK 12.22, HK 14.30
Chiral dynamics Mainz Heidelberg -
Collaboration ...........HK 38.3
Chou, W.-T. ................HK 10.8
Christ, Stefan ..............HK 12.14
Christen, Sandra ............HK 10.31
Chulkov, L. V. ...............HK 24.1
Chumakov, M. .............HK 14.30
Clark, R. ...................HK 10.10
Clark, R. M. .................HK 10.8
Clawiter, N. .......HK 14.11, HK 21.4
Clement, H. ........HK 46.1, HK 46.5
Clement, Heinz ..............HK 46.4
Cline, D. ....................HK 10.8
Coc, A. .....................HK 25.5
Collaboration, ISOLDE .......HK 31.1
Colonna, Maria ..............HK 47.5
COMPASS - Collaboration HK 12.10,
HK 12.11, HK 14.14, HK 14.16,
HK 26.2, HK 26.3, HK 28.1,
HK 28.2, HK 28.6
COMPLIS- Collaboration . . . HK 10.22
Conda, Fernando . . . . HK 4.6, HK 11.4
Cooper, J. R. .....HK 10.8, HK 10.27
Cornelius, T. ................HK 29.5
Cornelius, Thomas ............HK 3.8
Corte Rodriguez, N. ..........HK 11.2
COSY-11 - Collaboration . . HK 5.1,
HK 5.5, HK 5.6, HK 12.21,
HK 12.25
COSY-13 - Collaboration ......HK 5.3
COSY-TOF - Collaboration . HK 5.8,
HK 12.18, HK 12.23, HK 12.24,
HK 14.27, HK 14.37, HK 31.5,
HK 42.2, HK 46.1
Coulier, Nico ................HK 45.3
Courtin, S. ..................HK 25.5
Cowan, J. J. .................HK 18.1
Cozma, Mircea Dan ..........HK 44.6
Crater, Horace W. ...........HK 43.5
Credé, Volker ................HK 40.2
Cröni, M. ...................HK 46.5
Cröni, Margit ................HK 46.4
Cromaz, M. ................HK 10.10
Crystal Barrel/TAPS- Collaboration
HK 12.32
Csatlós, M. ........HK 3.4, HK 10.14
Curien, D. .........HK 17.3, HK 39.2
Czerski, Konrad .............HK 11.5
Dababneh, Sa’ed ............HK 25.2
Damjanovic, Sanja ...........HK 47.3
Danasino, A. . .HK 12.10, HK 14.14,
HK 14.25, HK 28.1
Darwish, Eed .......HK 9.26, HK 37.4
Daues, Heinz ................HK 41.1
Daugas, Jean-Michel .........HK 45.3
Davids, B. . . . HK 10.15, HK 25.4,
HK 39.1
Dax, A. .....................HK 9.27
de Angelis, G. ...HK 3.3, HK 10.5,
HK 10.17, HK 17.3, HK 45.4
De Frenne, D. ..............HK 10.15
de Huu, M. .........HK 3.4, HK 25.4
de Huu, M. A. . . HK 7.7, HK 10.15,
HK 10.16, HK 10.30, HK 24.2,
HK 39.1
de Huu, Mark ...............HK 20.6
de Leo, R. ...................HK 24.2
De Masi, Rita ......HK 28.2, HK 28.6
de Oliveira, Francois .........HK 45.3
De Poli, M. .................HK 45.4
Debruyne, Dimitri ........... HK 37.2
Demello, Martin .............HK 34.3
Demirörs, L. .................HK 40.5
Denschlag, J. O. ............HK 10.32
Denz, H. ....................HK 46.5
Denz, Holger ................HK 46.4
Dermois, O. ................HK 14.19
Deveraux, O. ................HK 39.2
Dewald, A. HK 3.3, HK 10.1, HK 10.2
Dewald, Alfred ..............HK 10.7
Di Toro, Massimo ............HK 47.5
Diaz Alonso, J. ..............HK 11.2
Diaz, J. .....................HK 13.5
Dickopp, Martin ............HK 12.16
Diefenbach, Jürgen .........HK 14.12
Dietel, Thomas ......HK 6.4, HK 34.3
Dinh, Phuong Mai ...........HK 33.4
Dinkelacker, P. ...............HK 6.2
Dinkelaker, P. . . HK 13.6, HK 33.2,
HK 33.3, HK 41.4
Dinkelaker, Peter . . . HK 13.7, HK 33.4
Dönau, F. HK 10.4, HK 10.12, HK 30.4
Döring, J. HK 3.2, HK 10.29, HK 30.2
Döring, Michael .............HK 33.6
Döring, Werner ..............HK 48.5
Index of Authors
Dohrmann, Frank . . HK 40.1, HK 48.3
Domscheit, J. . HK 10.10, HK 10.11,
HK 39.2, HK 39.4
Dorochkevitch, E. ............HK 46.1
Doskow, J. ..................HK 42.4
Drechsel, Dieter ..............HK 2.6
Dressler, Rugard .............HK 48.3
Dretzke, A. ...................HK 7.3
Drexler, Peter ...............HK 28.7
Drochner, M. ...............HK 14.27
Duennweber, Wolfgang .....HK 14.15
Düren, M. ...................HK 12.3
Düren, Michael ..............HK 49.1
Duran, I. ....................HK 14.6
Dymov, S. .........HK 5.9, HK 12.22
Dzhioev, A. ................HK 10.20
E91016 - Collaboration . ......HK 40.1
Eberl, T. . HK 14.1, HK 14.3, HK 48.4
Eberth, J. HK 7.6, HK 10.6, HK 17.3,
HK 30.4
Eckardt, Volker ......HK 6.5, HK 13.8
EDDA - Collaboration .........HK 5.2
Efremov, Anatoli ............HK 19.4
Egelhof, P. ..................HK 9.27
Eisermann, Yvonne .........HK 10.31
El Ghazaly, M. ....HK 14.11, HK 21.4
Elschenbroich, Ulrike ........HK 14.17
Elster, Charlotte .............HK 9.30
Eltaher, Atef ...............HK 14.13
Emhofer, Stephan HK 14.20, HK 14.21
Emmerich, Reinhard . . . .HK 14.31,
HK 42.5
Ender, C. ....................HK 30.4
Engels, O. ....................HK 7.3
Engels, R. ....................HK 5.9
Engels, Ralf . . HK 14.29, HK 14.31,
HK 42.5
Enghardt, Wolfgang ....HK 14.33,
HK 48.3, HK 48.7
Erhardt, A. .......HK 14.27, HK 46.1
Erhardt, Arthur ..............HK 46.4
Ermisch, K. ......HK 10.34, HK 12.33
Ermisch, Karsten ...........HK 10.30
ERNA - Collaboration ........HK 18.6
Ernst, J. ......................HK 5.7
Ernst, R. ....................HK 30.3
Euroball - Collaboration ......HK 17.3
EuroSuperNova - Collaboration
HK 7.7, HK 24.2, HK 24.4
Eversheim, D. ...............HK 28.4
Evtushenko, Pavel ..........HK 14.34
Eyrich, W. HK 5.8, HK 12.24, HK 28.4
Eyser, Oleg ...................HK 5.2
Fabbietti, L. . . . HK 14.1, HK 14.3,
HK 48.4
Fabry, Imrich ...............HK 12.28
Faessler, Amand . . HK 2.4, HK 23.1,
HK 27.1
Fallon, P. ..................HK 10.10
Falter, Thomas .....HK 38.4, HK 44.5
Farnea, E. HK 3.3, HK 10.17, HK 45.4
Fearick, R. .................HK 10.28
Fedorets, P. ......HK 12.22, HK 14.30
Feldmeier, Hans .............HK 43.4
Fey, Michael .................HK 25.5
Fiedler, B. ...................HK 30.4
Finck, Christian ..............HK 20.1
Fiori, G. .....................HK 42.3
Fischer, H. . . .HK 12.10, HK 14.14,
HK 14.25, HK 28.1
Fitting, Jörg .................HK 45.6
Fitzler, A. ..........HK 10.1, HK 10.2
Flatt, Björn HK 4.6, HK 11.3, HK 11.4
Fleischer, P. ..................HK 3.8
Fleischer, Patrick ............HK 9.18
Flenéus, Magdalena .........HK 14.22
Fleurot, F. .........HK 25.4, HK 25.5
Fleurot, Fabrice ..............HK 20.6
Flierl, Dominik ......HK 6.4, HK 34.3
Förtsch, S. .................HK 10.28
Fogelberg, Birger HK 10.33, HK 14.22
FOPI - Collaboration HK 20.3, HK 20.5
Forkel, Hilmar . . . . . . HK 9.19, HK 16.1
fossion, ruben ......HK 17.5, HK 45.2
Franchoo, S. ................HK 31.1
Frankenfeld, Ulrich ...........HK 41.1
Fransen, C. ....HK 10.3, HK 10.4,
HK 30.1, HK 30.5
Franz, J. ....HK 12.10, HK 14.14,
HK 14.25, HK 28.1
Frederico, Tobias ............HK 9.28
Frei, Andreas .................HK 7.1
Frekers, D. . . .HK 10.15, HK 10.16,
HK 24.4
Freund, A. ..................HK 38.6
Freund, S. ...................HK 30.4
Frick, Tobias ................HK 44.1
Friedman, E. ................HK 46.5
Friedrich, Jan . . HK 14.16, HK 26.3,
HK 28.6
Fries, R. J. ..................HK 23.6
Fries, Rainer .................HK 44.2

Friese, J. . HK 14.1, HK 14.3, HK 48.4
Friese, Volker . . . . . . HK 20.1, HK 33.1
Friman, Bengt ...............HK 20.1
Fritsch, M. .........HK 5.8, HK 12.24
Fritsch, Stefan ...............HK 38.5
Fritzsche, S. .................HK 9.27
Fröhlich, I. .........HK 14.4, HK 14.5
Froehlich, Ingo ..............HK 13.2
Frömel, Frank ...............HK 16.3
FRS/LAND - Collaboration . . HK 47.1
Fuchs, Christian . . . . . HK 2.4, HK 27.1
Fuchs, Michael .............HK 12.29
Fuentes, B. ..................HK 14.6
Fuhrmann, H. ...............HK 26.6
Fujimura, H. ..................HK 3.4
Fujita, M. ..................HK 12.20
Fujita, Y. ..................HK 10.28
Fujiwara, M. .......HK 3.4, HK 10.14
Funk, Andreas ...............HK 43.5
Gabriel, A. .........HK 14.4, HK 14.5
Gabriel, Adrian ..............HK 13.2
Gad, Khalaf .................HK 44.1
Gade, A. HK 10.3, HK 30.1, HK 30.5,
HK 39.3
Gadea, A. HK 3.3, HK 10.5, HK 10.17,
HK 45.4
Gärtner, Andreas ....HK 6.5, HK 13.8
Galanopoulos, E. ............ HK 25.5
Galaviz, D. ........HK 14.32, HK 18.4
Galindo, E. ..................HK 10.5
Gall, B. J.P. .................HK 10.1
Gallmeister, Kai .............HK 44.3
Ganzhur, S. .................HK 12.3
Ganzhur, Sergey .............HK 12.5
Garabatos, Chilo .............HK 41.1
garcia-ramos, jose-enrique . HK 17.5,
HK 45.2
Garg, U. ....................HK 39.1
Garzon, J. A. ................HK 14.6
Gasparyan , Achot M. ........HK 9.29
Gast, W. ...........HK 3.3, HK 10.17
Gast, Werner .................HK 7.8
Gattringer, Christof ..........HK 16.4
Gazdzicki, M. ................HK 33.3
Ga´zdzicki, M. . . . HK 6.2, HK 13.6,
HK 13.7, HK 33.2, HK 41.4
Ga´zdzicki, Marek ............HK 33.4
Gaˇsparić, I. ......HK 10.34, HK 12.33
GDH-Collaboration - Collaboration
HK 35.3
GDH - Collaboration - Collaboration
HK 12.31
Gebauer, B. .................HK 45.4
Geissel, H. .................HK 12.20
Geithner, W. ................HK 31.1
GEM - Collaboration HK 5.4, HK 5.4,
HK 12.17, HK 12.17, HK 12.19,
HK 12.19, HK 26.5, HK 26.5
Gemmeke, Hartmut .........HK 14.36
Georgiev, Georgi .............HK 45.3
Gerasimov, A. ..............HK 14.30
Gerber, J. ..........HK 10.9, HK 31.2
Gerl, Jürgen .................HK 48.1
Gernhäuser, R. . . HK 14.1, HK 14.3,
HK 48.4
Gersabeck, M. ...............HK 13.5
Gersch, G. ...................HK 17.3
Gilg, H. ....................HK 12.20
Gillitzer, A. . . . HK 12.3, HK 12.18,
HK 12.20
Gillitzer, Albrecht . . . ..........HK 8.4
Glässel, Peter ................HK 41.1
Glöckle, W. ................HK 10.30
Glück, F. ...................HK 10.21
Gocke, Christian .............HK 11.1
Godo, Melitta ..............HK 12.31
Godó, Melitta ..............HK 12.34
Goeke, K. ...................HK 23.6
Goeke, Klaus ................HK 19.4
Gönnenwein, F. .............HK 10.32
Görgen, A. ........HK 10.10, HK 39.4
Görres, Joachim .............HK 25.2
Götzen, Klaus ...............HK 19.1
Golak, J. ...................HK 10.30
Goncharova, N. .............HK 10.20
Gopych, M. .......HK 14.35, HK 21.5
Gorchtein, Michael ............HK 2.6
Goriely, Stephane ............HK 36.3
Goryachev, V. ..............HK 14.30
Gotta, D. ...................HK 26.6
Gottwald, Stefan ..............HK 2.8
Grabmayr, P. .....HK 9.23, HK 14.28
Gräf, H.-D. .......HK 14.35, HK 21.5
Grama, C. ...................HK 25.5
Graw, Gerhard ..............HK 10.31
Grawe, H. ...................HK 30.2
Gregorich, K. E. .............HK 10.8
Greiff, J. ....................HK 40.5
Greiner, C. ..................HK 37.1
Greiner, Carsten . HK 9.14, HK 9.15,
HK 27.3, HK 38.2, HK 38.4,
HK 44.3
Greiner, W. .........HK 3.8, HK 29.5
Grewe, E. .........HK 10.15, HK 24.4
Griesshammer, Harald ........HK 44.4
Grießhammer, Harald W. . . HK 9.1,
HK 9.4
Grigorian, Hovik .............HK 11.1
Grinberg, M. ................HK 10.4
Gröger, Stephan ......HK 7.1, HK 7.4
Grosse, E. ...................HK 10.4
Grosse, Eckart ...............HK 48.3
Grube, B. ...................HK 28.1
Grube, Boris . . HK 14.16, HK 28.2,
HK 28.6
Gruber, A. ..................HK 26.6
Grünemaier, A. ....HK 14.14, HK 28.1
Grünemeier, A. .............HK 12.10
Grzonka, D. .................HK 31.4
GSI-ISOL - Collaboration . . HK 3.2,
HK 3.6, HK 10.24, HK 10.29,
HK 45.1
Günemeier, A. ..............HK 14.25
Guliyev, E. ..................HK 17.4
Gulyás, J. HK 3.4, HK 10.14, HK 39.1
Gusev, L. .................. HK 14.30
Gustafsson, Carolina ........HK 14.22
Gutsmiedl, Erwin .............HK 7.4
Górska, M. ..................HK 30.2
Haas, F. .....................HK 25.5
Haberer, Thomas ............HK 48.7
Habs, D. .............HK 7.3, HK 7.5
Habs, Dieter .....HK 14.20, HK 14.21
HADES- Collaboration . . .HK 13.2,
HK 14.1, HK 14.2, HK 14.4,
HK 14.6, HK 14.7, HK 48.2,
HK 48.3
Haeberli, W. .................HK 42.4
Hägler, Philipp . .............HK 38.1
Härtlein, T. .................HK 30.4
Hagemann, G. B. HK 10.10, HK 10.11,
HK 39.2, HK 39.4
Hagemann,M. ...HK3.4,HK7.7,
HK 10.16, HK 10.30, HK 24.2
Hagenbuck, F. ....HK 14.11, HK 21.4
Haidenbauer, Johann ........HK 9.29
Hambsch, F.-J. .............HK 10.32
Hambsch, Franz-Josef ......HK 10.33
Hamilton, J. H. ...............HK 3.8
Hammache, F. ...............HK 25.5
Hammel, Thorsten ...........HK 14.9
Hammer, J. W. ..............HK 25.5
Hanhart, Christoph . HK 9.29, HK 9.30
Hannachi, F. .......HK 25.5, HK 39.2
Hannen, V. .................HK 10.14
Hannen, V. M. . . .HK 10.16, HK 10.30
Hara, K. ......................HK 3.4
Harakeh, M. N. . . .HK 3.4, HK 7.7,
HK 10.14, HK 10.16, HK 10.30,
HK 10.34, HK 12.33, HK 14.19,
HK 24.2, HK 39.1
Harissopulos, S. ............. HK 25.5
Hartmann, F. J. ............HK 10.21
Hartmann, F. Joachim HK 7.1, HK 7.4
Hartmann, O. ...............HK 12.3
Hartmann, Olaf N. . HK 12.1, HK 20.5
Hartmann, T. . . HK 3.7, HK 10.25,
HK 10.26, HK 10.27, HK 14.32,
HK 14.35, HK 18.2, HK 18.3,
HK 18.4, HK 21.5
Haupt, Christian .............HK 43.2
Hauschild, K. ................HK 30.2
Hawranek, P. .........HK 5.4, HK 5.4
Hayano, R. S. ..............HK 12.20
Hecht, A. A. ................HK 10.8
Hedicke, S. . . .HK 12.10, HK 14.14,
HK 14.25, HK 28.1
Hehl, T. ................... HK 14.28
Hehner, Joerg ...............HK 41.1
Heide, Peter .................HK 11.5
Heidel, Klaus ................HK 48.3
Heil, Michael ................HK 25.2
Heil, W. .........HK 10.21, HK 10.23
Heim, J. ..........HK 12.9, HK 14.28
Heinsius, F. H. . HK 12.10, HK 14.14,
HK 14.25, HK 26.2, HK 28.1
Hejny, V. ..........HK 12.3, HK 34.1
Hejny, Volker ................HK 48.5
Helariutta, K. ............... HK 30.2
Helbing, Klaus ...............HK 35.3
Hellmann, Vladimir ..........HK 9.24
Hemmert, Thomas ...........HK 44.4
Hemmert, Thomas R. HK 9.6, HK 15.2
Hennebach, M. ..............HK 26.6
Henneck, Reinhold . . . .HK 4.3, HK 7.2
Henoch, Mark ...............HK 28.5
Herfurth, F. ..................HK 7.3
Herfurth, Frank ..............HK 17.2
HERMES- Collaboration . HK 12.12,
HK 12.13, HK 14.17, HK 14.18,
HK 19.3, HK 28.3
HERMEScollaboration - Collaboration
HK 28.5
HERMESKollaboration - Collaboration
HK 49.1
Herrmann, Norbert ..........HK 20.1
Herskind, B. ......HK 10.10, HK 39.4
Hertenberger, Ralf ..........HK 10.31
Hertling, M. ......HK 14.35, HK 21.5
Hessberger, F. ................HK 7.3
heyde, kris .........HK 17.5, HK 45.2
Heyse, J. . HK 7.7, HK 10.16, HK 24.2
Hildebrandt, Robert ..........HK 44.4
Hilligsoe, K.-M. ..............HK 31.1
Hinterberger, F. ..............HK 5.7
Hirenzaki, S. ...............HK 12.20
Hodenberg, M. v. ...........HK 14.25
Höhne, Claudia ..............HK 33.1
Hoek, Matthias ..............HK 48.5
Hoekstra, R. ...............HK 14.19
Hoffmann, Roland ...........HK 16.2
Hofmann, F. . . HK 10.16, HK 10.20,
HK 17.4
Hofmann, Ralf ................HK 9.5
Hofmann, S. ..................HK 7.3
Holden, J. ...................HK 30.3
Holstein, Barry ...............HK 9.7
Holzmann, Romain ..........HK 20.1
Hommez, Brecht ............HK 19.5
Homolka, J. . . . HK 14.1, HK 14.3,
HK 48.4
Hooft, Gerard ’t ..............HK 1.1
Horiuchi, H. .................HK 16.7
Horn, Igor ...................HK 40.4
Horn, Roland ...............HK 10.22
Hornidge, D. L. ..............HK 26.4
Huber, Gerhard .............HK 10.22
Hübel, H. . . . HK 10.10, HK 10.11,
HK 39.2, HK 39.4
Hunyadi, M. . . . HK 3.4, HK 10.15,
HK 24.2, HK 25.4, HK 39.1
Hutsch, Jochen ..............HK 48.3
Hutter, C. ....HK 10.8, HK 10.27,
HK 14.32, HK 18.2, HK 18.3,
HK 18.4
Hǒsek, Jǐri ....................HK 2.5
Ibald, R. ......................HK 5.7
Ihara, F. ...........HK 3.4, HK 10.14
Ilyina, Y. ....................HK 40.5
Imai, Yoshio .................HK 21.3
Indelicato, P. ................HK 26.6
Ishikawa, T. ..................HK 3.4
ISOLDE - Collaboration ......HK 47.1
Isselhorst, Carsten ...........HK 9.22
Itahashi, K. ................HK 12.20
Ivanov, Alexander ............HK 23.1
Ivanov, Dmitry ..............HK 29.1
Iwasaki, M. .................HK 12.20
Jacobs, E. .......HK 10.15, HK 10.16
Jäger, H. M. .......HK 3.3, HK 10.17
Jahn, R. ......................HK 5.7
Jakob, G. ...................HK 30.3
Jakob, Rainer ................HK 50.1
Jansen, P. ....................HK 5.9
Janssen, Silke ...............HK 32.3
Janssen, Stijn ...............HK 37.3
Jarczyk, L. ...................HK 5.7
Jensen, D. R. . HK 10.10, HK 10.11,
HK 39.2
Jentschel, M. ................HK 45.5
Jesinger, P. ..................HK 46.5
Jessen, K. ..........HK 10.1, HK 17.1
Jolie,J. ..HK3.1,HK7.6,HK10.2,
HK 30.1, HK 45.5
Jolie, Jan ..................HK 10.31
Jolos, R. V. .................HK 17.6
Jones, Kate .................HK 24.6
Jones, P. ....................HK 30.2
Joosten, R. .........HK 5.7, HK 28.4
Juchem, Sascha .............HK 9.15
Julin, R. .................... HK 30.2
Jungclaus, A. ......HK 10.5, HK 17.3
Junghans, A. R. .............HK 25.1
Jungmann, K. ..............HK 14.19
Jungmann, Klaus ............HK 35.1
Junk, B. ..........HK 10.15, HK 24.4
Junkersfeld, Jörg ............HK 40.3
Kacharava, A. ................HK 5.9
Kämpfer, B. .................HK 13.9
Kaempfer, Burkhard HK 6.8, HK 23.4,
HK 48.3
Käppeler, Franz .............HK 25.2
Käubler, L. . . . HK 10.4, HK 10.12,
HK 30.4
Kaiser, K.-H. ......HK 14.11, HK 21.4
Kaiser, Norbert ...HK 2.7, HK 9.9,
HK 9.10, HK 9.11, HK 9.12,
HK 9.13, HK 38.5
Kalantar-Nayestanaki, N. . HK 10.30,
HK 10.34, HK 12.33
Kalantar-Nayestanaki, Nasser . . HK 8.2
Kalinovsky, Yuri .............HK 11.1
Kalmykov, Y. . HK 10.16, HK 10.20,
HK 10.25, HK 10.28
Kamada, H. ................HK 10.30
Kampert, Karl-Heinz ..........HK 4.1
Index of Authors
Kanaki, Kalliopi .............HK 48.3
KaoS- Collaboration HK 6.8, HK 20.2,
HK 47.4
Kappertz, S. .................HK 31.1
KARMEN - Collaboration .....HK 4.4
Karsch, Leonhard ...........HK 14.37
Karstens, F. . . HK 12.10, HK 14.14,
HK 14.25, HK 28.1
KASCADE - Collaboration ....HK 4.1
Kasemann, S. ...............HK 30.4
Kaskulov, M. M. .............HK 9.23
Kastaun, W. . . HK 12.10, HK 14.14,
HK 14.25, HK 28.1
KATRIN - Collaboration . . . HK 4.2,
HK 11.3
Keil, Ch. ....................HK 37.1
Keim, M. ....................HK 31.1
Kellerbauer, A. ..............HK 17.2
Kemper, G. ..................HK 10.2
Kenn, O. .......... HK 10.9, HK 31.2
Kester, O. ..........HK 7.5, HK 49.4
Kester, Oliver ....HK 14.20, HK 14.21
Ketzer, Bernhard . . HK 14.16, HK 28.6
Khorguashvili, Z. ...........HK 14.30
Kiel, Henning .................HK 4.8
Kiener, J. ...................HK 25.5
Kienle, P. .........HK 12.3, HK 12.20
Kilian, K. . ..................HK 42.2
Kilian, W. ..................HK 10.23
Kiptily, Dmitri ...............HK 29.2
Kirschner, D. .......HK 14.4, HK 14.5
Kirschner, Daniel ............HK 13.2
Kirschner, Roland ............HK 38.1
Kisselev, Oleg ................HK 3.5
Kiˇs, M. HK 10.30, HK 10.34, HK 12.33
Kleber, V. ...................HK 46.6
Klehr, F. .....................HK 5.9
Kleifges, Matthias ..........HK 14.36
Klein, Frank .................HK 12.8
Klein-Bösing, Christian ........HK 6.6
Kleines, H. ...................HK 5.9
KLOE - Collaboration ........HK 46.2
Klug, T. .................... HK 10.1
Kluge, H.-J. HK 7.3, HK 9.27, HK 17.2
Kneissl, U. ....HK 10.3, HK 10.4,
HK 30.5, HK 39.3
Kneißl, U. ..................HK 10.12
Knoll, Jörn ..................HK 23.3
Koch, H. ....................HK 12.3
Koch, Volker ................HK 33.6
Köck, F. ....................HK 30.4
Köck, Frank .................HK 45.6
König, W. ...................HK 14.6
Koenig, Wolfgang ...........HK 20.1
Königsmann, K. HK 12.10, HK 14.14,
HK 14.25, HK 28.1
Körner, H.-J. . . . HK 14.1, HK 14.3,
HK 48.4
Kohl, M. ...................HK 12.30
Kohstall, C. . . . HK 10.3, HK 10.4,
HK 10.12, HK 30.5, HK 39.3
Kojouharov, Ivan ............HK 48.1
Kokalova, Tz. ...............HK 45.4
Koll, Matthias ...............HK 9.24
Kollegger, T. . . . HK 6.2, HK 13.6,
HK 13.7, HK 33.2, HK 33.3,
HK 41.4
Kollegger, Thorsten ..........HK 33.4
Kolomeitsev, Evgeni E. ........HK 2.2
Komarov, V. .......HK 5.9, HK 12.22
Konorov, I. ..................HK 28.1
Konorov, Igor . . HK 14.16, HK 28.2,
HK 28.6
Kopatch, Juri ................HK 48.1
Kopecky, S. ................HK 14.19
Kopmann, Andreas .........HK 14.36
Koptev, V. ...................HK 5.9
Koptev, Vladimir ...........HK 14.31
Korichi, A. ..................HK 25.5
Korten, W. ..................HK 30.2
Kossert, Karsten .............HK 26.1
Kostial, S. ........HK 14.35, HK 21.5
Kothe, Rainer ..............HK 14.10
Kotte, R. ....................HK 14.6
Kotte, Roland ...............HK 48.3
Kotulla, Martin ..............HK 32.2
Kowina, Piotr .................HK 5.5
Kozela, A. ....................HK 5.7
Krassilnikov, A. ..............HK 21.5
Krasznahorkay, A. . . HK 3.4, HK 10.14
Kratz, K. L. ................HK 14.13
Kratz, K.-L. .................HK 18.1
Kraus, Christine .....HK 4.6, HK 11.4
Kraus, I. . HK 6.2, HK 13.6, HK 13.7,
HK 33.2, HK 33.3, HK 41.4
Kraus, Ingrid ................HK 33.4
Krauss, B. .................HK 14.18
Kravchuk, Vladimir ..........HK 20.6
Kravtsov, P. ..................HK 5.9
Kravtsov, Peter . . HK 14.29, HK 14.31
Kremers, H. R. ..............HK 42.1
Kress, J. ....................HK 46.1

Kreutz, M. ........HK 10.3, HK 10.12
Krewald, Siegfried . . HK 43.1, HK 43.6
Kriembardis, G. ..............HK 25.5
Krings, T. ...................HK 42.3
Krivoruchenko, Mikhail ........HK 2.4
Kröll, T. ....................HK 10.5
Kröll, Th. ..................HK 10.11
Krok, Patrizia .......HK 6.5, HK 13.8
Krücken, R. . . . HK 10.2, HK 10.8,
HK 10.27
Krüsemann, B. A.M. ........HK 10.16
Kube, G. .........HK 14.11, HK 21.4
Kuckei, Jan .........HK 4.7, HK 44.1
Kuehl, T. ...................HK 9.27
Kühn, W. HK 12.3, HK 14.4, HK 14.5
Kuehn, Wolfgang ............HK 13.2
Kuhn, Roland ...............HK 26.3
Kukulin, V. I. ................HK 9.23
Kulessa, Pawel ................HK 5.3
Kuliev, A. A. ................HK 17.4
Kulikov, A. ...................HK 5.9
Kumbartzki, G. .....HK 30.3, HK 31.2
Kunz, R. ....................HK 25.5
Kurbatov, V. .................HK 5.9
Kuro´s.- ˙ Zo̷lnierczuk, J. ......HK 10.30
Lacroix, D. .................HK 10.28
Laier, U. ..........HK 14.35, HK 21.5
LAND - Collaboration ........HK 24.5
LAND/S188/S233 - Collaboration
HK 24.6
Landgraf, Jeff ...............HK 34.3
Langanke, Karlheinz .........HK 49.3
Lange, Söeren ...............HK 34.3
Lange, Sören .................HK 6.4
Lassen, Jens ................HK 10.22
Lauer, Martin ............... HK 45.6
Lauth, W. HK 7.3, HK 14.11, HK 21.4
Lawall, Ralf ................HK 12.26
Lawrie, J. ..................HK 10.28
Leberig, Mario ..............HK 12.11
Lee, Dean ....................HK 9.8
Lee, I. Y. .........HK 10.10, HK 30.3
Lefèbvre, A. .................HK 25.5
Lehmann, I. .................HK 46.3
Lehnert, J. .........HK 14.4, HK 14.5
Lehnert, Joerg ...............HK 13.2
Lehnert, Ulf .......HK 14.34, HK 21.2
Lehr, Jürgen .......HK 29.3, HK 38.4
Leino, M. ...................HK 30.2
Lenhardt, A. ......HK 14.35, HK 21.5
Lenske, H. ........HK 10.20, HK 37.1
Lenske, Horst ................HK 29.3
Lenz, Alexander .............HK 29.4
Lenzi, S. M. .................HK 45.4
Lenzi, Silvia .................HK 10.7
LEPS- Collaboration ........HK 46.4
Leske, J. ...........HK 10.9, HK 31.2
Leupold, Stefan . . HK 2.3, HK 16.3,
HK 29.3, HK 38.2
LeVine, Micheal .............HK 34.3
Lewis, Randy .................HK 9.7
Lewitowitz, Marek ...........HK 45.3
Ley, Jürgen .......HK 14.31, HK 42.5
Lieb, K. P. ..................HK 17.3
Lieder, R. M. .......HK 3.3, HK 10.17
Lieder, Rainer ................HK 7.8
Lievens, P. ..................HK 31.1
Lindenberg, K. ..............HK 18.2
Linnemann, A. . . HK 10.3, HK 10.4,
HK 30.1, HK 30.5, HK 39.3,
HK 45.5
Lisetskiy, A. .................HK 30.5
Lisetskiy, Alexander ..........HK 17.1
Liu, Bin .....................HK 43.5
Liu, Y.-W. .................. HK 26.6
Ljubicic,Jr., Ante ............HK 34.3
Lo Curto, Gaspare ...HK 6.5, HK 13.8
Lobashev, V. ...............HK 10.23
Löhner, H. . . . HK 10.34, HK 12.32,
HK 12.33
Loehner, Herbert . . . HK 20.6, HK 48.5
Löring, Ulrich ......HK 37.5, HK 43.2
Lommel, B. ...................HK 7.3
Lopez-Martens, A. . .HK 25.5, HK 39.2
Lorentz, B. ..........HK 5.9, HK 42.4
Lorentz, Bernd . . . HK 14.29, HK 14.31
Lorenz, Stefan ..............HK 14.31
Lozeva, Radomira ............HK 48.1
Lozhkin, Oleg ...............HK 47.6
Lukasik, Jerzy ...............HK 47.2
LUNA - Collaboration . . . HK 18.5,
HK 25.3
Lunardi, S. . . . . HK 3.3, HK 10.11,
HK 10.17
Lunney, D. . .................HK 17.2
Lutz, Matthias .............. HK 20.1
Lutz, Matthias F. M. ..........HK 2.2
Lynen, U. ...................HK 12.3
Ma, W. C. .................HK 10.10
Macchiavelli, A. . . . ..........HK 30.3
Macchiavelli, A. O. HK 10.8, HK 10.10
Macharashvili, G. .............HK 5.9
Machner, H. HK 5.4, HK 5.4, HK 5.7,
HK 12.17, HK 12.17, HK 12.19,
HK 12.19, HK 26.5, HK 26.5
Madland, D. G. ..............HK 29.5
Magiera, A. ..................HK 5.7
Mahjour-Shafiei, M. ....HK 10.30,
HK 10.34, HK 12.33
Mahnke, Nils ................HK 29.4
Maier, L. ...................HK 12.20
Maier-Komor, P. .............HK 30.3
Maier-Komor, Peter ...........HK 7.4
Malcherek, D. ...............HK 25.5
Mallion, S. .................HK 10.12
Mandal, Samit ...............HK 48.1
Manil, B. ....................HK 26.6
Mannweiler, H. ....HK 14.11, HK 21.4
Marco, Eugenio .....HK 9.5, HK 19.6
Marginean, N. . . . . . .HK 10.5, HK 45.4
Marin , A. ..................HK 14.24
Marin, Ana ..................HK 20.4
Marinova, K. ................HK 31.1
Markert, C. HK 6.2, HK 13.6, HK 33.2
Markushin, V. ...............HK 26.6
Martemyanov, Boris ...........HK 2.4
Martens, Gunnar . . . HK 38.2, HK 44.3
Martin, I. ..................HK 14.28
Martinez, T. . . . HK 10.5, HK 17.3,
HK 45.4
Maruhn, J. A. . ......HK 3.8, HK 29.5
Marx, D. ....................HK 9.27
Marx, G. .....................HK 7.3
Maschuw, R. .................HK 5.7
Matea, Iolanda ..............HK 45.3
Mathes, Hermann-Josef .....HK 14.36
Matos, M. .................HK 12.20
Matschinsky, P. ..............HK 10.4
Mattiello, Stefano ...........HK 9.28
Mayer-Kuckuk, T. ............HK 5.7
Mazzocchi, C. ......HK 3.6, HK 10.24
McMahan, M. ...............HK 30.3
Meier, R. ..........HK 12.3, HK 46.5
Meier, Rudolf ................HK 46.4
Menegazzo, R. . . . . . HK 3.3, HK 10.17
Menshikov, Alexandre .......HK 14.36
Mergel, E. ...................HK 39.2
Merschmeyer, Markus ........HK 20.3
Merten, Dirk .......HK 37.5, HK 43.2
Mertler, G. ...................HK 5.7
Mertzimekis, T. J. ...........HK 30.3
Merzliakov, S. ...............HK 42.3
Metag, V. ...................HK 12.3
Metag, Volker ...............HK 48.5
Metsch, Bernard . HK 9.24, HK 37.5,
HK 43.2
Metz, Andreas ................HK 2.6
Meyer, H. O. ................HK 42.4
Michel, P. ...................HK 21.5
Michel, Peter . . . . . HK 14.34, HK 21.2
Michel, Thilo ....HK 12.31, HK 12.34
Micheletti, S. ................HK 24.2
Micherdzińska, A. ..........HK 10.30
Migura, Sascha ..............HK 37.5
Mihailescu, L. ......HK 3.3, HK 10.17
Mihailescu, Lucian ............HK 7.8
Mikirtytchiants, M. ...........HK 5.9
Mikirtytchiants, Maxim . . HK 14.29,
HK 14.31, HK 42.5
Milosevic, Jovan .............HK 41.3
Miniball - Collaboration . . HK 10.6,
HK 31.3
Mischke, A. . . . HK 13.7, HK 33.2,
HK 33.3, HK 41.4
Mischke, André ......HK 6.2, HK 33.4
Möller, O. ...................HK 10.1
Möller, Oliver . . . . . HK 10.2, HK 10.31
Mohr, P. ....HK 10.26, HK 10.27,
HK 14.32, HK 18.2, HK 18.3,
HK 18.4
Mohrmann, E. C. ............HK 25.1
MOMO - Collaboration .......HK 5.7
Montani, Fernando ..........HK 44.1
Moore, R. B. ................HK 17.2
Mora, Maria .........HK 6.5, HK 13.8
Morgenstern, R. ............HK 14.19
Mornas, L. ..................HK 11.2
Mornas, Lysiane ..............HK 4.5
Mos, Sander .................HK 28.3
Mosel, Ulrich . . .HK 16.3, HK 29.3,
HK 38.2, HK 38.4, HK 44.5
Moskal, P. ...................HK 12.3
Moskal, Pawe̷l ................HK 5.1
Motzke, Andreas .............HK 9.30
Mühlich, Pascal ..............HK 38.4
Müller, Beatrix ......HK 4.6, HK 11.4
Müller, G. ..........HK 10.9, HK 31.2
Müller, Stefan E. ............HK 46.2
Münch, M. HK 14.1, HK 14.3, HK 48.4
Muenstermann, Daniel ........HK 4.8
Münzenberg, G. ....HK 7.3, HK 12.20
Müther, Herbert .....HK 4.7, HK 44.1
Mukherjee, M. ................HK 7.3
Mukherjee, S. ..............HK 10.28
Munkel, J. ....................HK 5.7
muon g.-2. collaboration, on behalf of
the .....................HK 35.1
Mussgiller, A. . . ..............HK 42.3
Muttere, M. .................HK 9.27
Mutti, P. ....................HK 45.5
Máté, Z. ...........HK 3.4, HK 10.14
NA49 - Collaboration . . . .HK 13.6,
HK 13.7, HK 33.1, HK 33.3,
HK 33.4, HK 41.4
Nähle, O. ...................HK 28.4
Napoli, D. R. . . . HK 3.3, HK 10.5,
HK 10.11, HK 10.17, HK 39.4,
HK 45.4
Napoli, Daniel R. ............HK 10.7
Naumann, Lothar ............HK 48.3
Navilliat Cuncic, Oscar .......HK 45.3
Neff, Thomas ................HK 43.4
Negret, A. ................. HK 10.15
Nekipelov, M. ................HK 5.9
Nekipelov, Mikhail ..........HK 14.31
Nelms, N. ...................HK 26.6
Nelson, John ................HK 34.3
Nelyubin, V. ..................HK 5.9
Nenoff, N. ...................HK 39.2
Neugart, R. .................HK 31.1
Neumaier, S. R. .............HK 9.27
Neumayr, J. ..................HK 7.3
Neusser, A. .......HK 10.11, HK 39.2
Newman, R. ................HK 10.28
Neyens, Gerda . . . . . .HK 45.3, HK 50.3
Nieminen, A. .................HK 7.5
Nijboer, T. ..................HK 42.1
Noertershaeuser, W. .........HK 9.27
Nogga, A. ..................HK 10.30
Nord, A. ....................HK 10.4
Nosser, A. ..................HK 14.13
Novotny, Rainer .............HK 48.5
Nowacki, F. .................HK 30.2
Oberstedt, A. ..............HK 10.32
Oberstedt, Andreas ....HK 10.33,
HK 14.22
Oberstedt, S. ...............HK 10.32
Oberstedt, Stephan .........HK 10.33
Oertel, Micaela ...............HK 2.5
Ohtsubo, T. ................HK 12.20
Okamura, H. ................HK 24.2
Oldenburg, Markus . . HK 6.5, HK 13.8
Ollitrault, Jean-Yves . . .......HK 33.4
Oppermann, T. ..............HK 9.16
Orth, H. ....................HK 12.3
Ossmann, Jens ..............HK 9.21
Otten, Ernst W. .............HK 11.4
Otten, Ernst Wilhelm .........HK 4.6
Ouimet, Pierre ................HK 9.7
Paetz gen. Schieck, H. ........HK 5.9
Paetz gen. Schieck, Hans . HK 14.29,
HK 14.31, HK 42.5
Pätzold, J. ..................HK 46.1
Pätzold, Jens ................HK 46.4
Pakou, A. ...................HK 30.3
Palit, R. .....................HK 24.5
Pancella, P. V. ..............HK 42.4
Pancholi, S. C. .............HK 10.11
Papka, P. ...................HK 45.4
Paradellis, T. . . . .............HK 25.5
Park, S. H. ..................HK 25.1
Parodi, Katia ................HK 48.7
Pascovici, G. ................HK 10.6
Pasquini, Barbara .............HK 2.6
Pasternak, A. A. . . . HK 3.3, HK 10.17
Paul, S. .....................HK 12.3
Paul, Stephan . . . HK 7.1, HK 7.4,
HK 14.16, HK 26.3, HK 28.2,
HK 28.6
Pauly, C. ....................HK 40.5
Pavlenko, Oleg ..............HK 23.4
Pechenov, V. ................HK 14.6
Peitzmann, Thomas ...........HK 1.3
Penninga, T. D. .............HK 9.25
Perez Garcia, M. A. ..........HK 11.2
Peters, K. ...................HK 12.3
Petkov, Pavel ................HK 10.7
Petrache, C. ................HK 10.11
Petri, M. ...........HK 14.4, HK 14.5
Petri, Markus ................HK 13.2
Petrus, A. ....................HK 5.9
Petry, Herbert-R. . . . HK 37.5, HK 43.2
Petzoldt, Gerd ........HK 7.1, HK 7.4
Peusquens, R. ...............HK 10.1
Pezoldt, G. .................HK 10.21
Pfeiffer, B. ..................HK 18.1
Pfeiffer, M. ..................HK 32.1
Phair, L. ....................HK 30.3
PHENIX - Collaboration . . . HK 6.1,
HK 6.7
Pickert, N. .................HK 14.18
Pietralla, N. . . . HK 10.4, HK 10.8,
HK 15.4, HK 17.1, HK 30.5
Pietraszko, Jerzy ............HK 48.2
pirner, hans juergen ..........HK 38.3
Pitz, H. H. ....HK 10.3, HK 10.4,
Index of Authors
HK 10.12, HK 30.5, HK 39.3
Platz, M. .........HK 14.35, HK 21.5
Platzer, Klaus ..............HK 14.15
Plettner, C. .................HK 45.1
Pobylitsa, P. V. ...............HK 2.1
Pochodzalla, J. .....HK 12.3, HK 12.7
Podchasky, S. ..............HK 14.30
Podsvirova, E. O. . . HK 3.3, HK 10.17
Pönisch, Falk ...............HK 14.33
Poghosyan, Gevorg ..........HK 11.1
Polachic, C. ..................HK 7.7
Polasik, Marek ...............HK 20.6
Polleri, Alberto ..............HK 27.2
Pollock, R. E. ...............HK 42.4
Polyakov, M. ................HK 23.6
Polyakov, M. V. . . HK 2.1, HK 9.20,
HK 29.2
Pommerrenig, Dieter ........HK 14.23
Ponomarev, V. .............HK 10.28
Poskanzer, Art ...............HK 33.4
Post, H. .....................HK 42.1
Post, Marcus ................HK 38.4
Prade, H. ...................HK 30.4
Prasuhn, D. . . . ...............HK 5.9
Prasuhn, Dieter ..............HK 21.1
PROMICE/WASA - Collaboration
HK 46.1
Protic, D. ...................HK 42.3
Przewoski, B. v. .............HK 42.4
Pühlhofer, Falk ..............HK 33.1
Putschke, Jörn ......HK 6.5, HK 13.8
Pérez, Armando ..............HK 4.5
Quin, P. A. ..................HK 42.4
Quint, W. ....................HK 7.3
Radyushkin, A. V. HK 9.16, HK 9.17,
HK 38.6
Rahaman, S. ................. HK 7.3
Rainovski, G. ................HK 10.5
Raiola, Francesco ............HK 18.5
Rakers, S. . . . HK 10.15, HK 10.16,
HK 24.4
Rakow, P. E.L. ..............HK 16.4
Ramachers, Yorck .............HK 4.8
Raman, S. .................HK 10.32
Ramström, Elisabet . . . . HK 10.33,
HK 14.22
Rangacharyulu, C. . . HK 7.7, HK 12.30
Rathmann, F. .......HK 5.9, HK 42.4
Rathmann, Frank HK 14.29, HK 14.31,
HK 42.5
Ratzinger, Ulrich ...........HK 14.21
Reif, J. ......................HK 30.4
Reifarth, Rene ...............HK 25.2
Reinhard, P.-G. ......HK 3.8, HK 29.5
Reinhard, Paul-Gerhard ......HK 9.18
Reischl, Andreas .............HK 28.3
Reiter, P. ....................HK 30.4
Reitz, B. ........HK 10.16, HK 10.20
Rejmund, M. . ...............HK 30.2
Renfordt, R. . . . . HK 6.2, HK 13.6,
HK 13.7, HK 33.2, HK 33.3,
HK 41.4
Renfordt, Rainer . . . HK 33.4, HK 41.1
Renk, Thorsten . . HK 9.3, HK 27.2,
HK 27.4
REX-ISOLDE - Collaboration
HK 14.21, HK 31.3, HK 49.4
Reygers, Klaus ................HK 6.1
Reymann, J. . . HK 12.10, HK 14.14,
HK 14.25, HK 28.1
Rhone-Neckar-Flow - Collaboration
HK 23.2
Richter, A. . . . HK 10.16, HK 10.20,
HK 10.25, HK 10.28, HK 12.30,
HK 14.35, HK 17.4, HK 21.5
Ricken, Ralf .................HK 9.24
Rinckel, T. ..................HK 42.4
Rinneberg, H. ..............HK 10.23
Ritman, J. . . . . HK 12.3, HK 12.4,
HK 14.4, HK 14.5
Ritman, James ..............HK 13.2
Rochholz, H. ......HK 14.11, HK 21.4
Rochman, D. ...............HK 10.32
Rochow, W. ................HK 14.32
Rodriguez, D. .................HK 7.3
Rodriguez, Rayner ...........HK 23.1
Rodrígez, D. .................HK 17.2
Röhrich, Dieter ..............HK 34.3
Röpke, G. ...................HK 16.7
Rogachevskiy , A. ..........HK 14.19
Rolfs, Claus .................HK 18.5
Rombouts, Stefan ...........HK 22.3
Rossen, P. v. .................HK 5.7
Rossi Alvarez, C. . . . HK 3.3, HK 10.17
Rossi-Alvarez, C. . . . HK 10.2, HK 39.4
Roth, Robert ................HK 43.4
Roth, Thomas ...............HK 16.6
Rousseau, M. ......HK 25.5, HK 45.4
Rowley, N. ..................HK 25.5
Roy, B. ..........HK 12.17, HK 12.17
Rummukainen, Kari ..........HK 44.2
Ruprecht, Götz ..............HK 11.5

Rusev, G. ..................HK 10.12
Rusi El Hassani, A. J. ........HK 26.6
Ryckebusch, Jan . . . HK 37.2, HK 37.3
Ryde, H. ....................HK 39.4
Ryezayeva, N. ..............HK 10.25
Rz¸aca-Urban, T. . . . HK 3.3, HK 10.17
S174 - Collaboration .HK 3.5, HK 24.1
Sadovski, Alexandre HK 14.6, HK 48.3
Saha, B. ....................HK 10.1
Saha, Swapan K. ............HK 42.4
Sailer, B. . HK 14.1, HK 14.3, HK 48.4
Sako, Hiroyuki ...............HK 41.5
Sanchez, M. .................HK 14.6
Sandoval, A. . . . .HK 6.2, HK 13.6,
HK 13.7, HK 33.2, HK 33.3
Sandoval, Andres ............HK 33.4
SAPHIR - Collaboration . .HK 12.26,
HK 12.27, HK 32.5
Sapojnikov, M. ..............HK 12.3
Sarkadi, J. ....................HK 5.9
Sassen, Felix ................HK 43.6
Sato, M. ...................HK 12.20
Sauli, Fabio ................HK 14.16
Sauvan, E. ..................HK 17.2
Schäfer, A. HK 9.16, HK 23.6, HK 38.6
Schäfer, Andreas . HK 16.4, HK 29.1,
HK 38.1, HK 44.2
Schäfer, D. ........HK 14.4, HK 14.5
Schaefer, Daniel .............HK 13.2
Schall, Jean-Pierre . . .HK 4.6, HK 11.4
Schatz, H. ...................HK 18.1
Scheck, M. . . . . HK 10.3, HK 10.4,
HK 10.12, HK 30.5, HK 39.3
Scheid, W. . . .HK 10.18, HK 10.19,
HK 17.6
Scheidenberger, C. . . HK 7.3, HK 17.2
Scheinast, Werner ............HK 6.8
Scheit, Heiko .......HK 31.3, HK 45.6
Schempp, Alwin .............HK 21.6
Scherer, Stefan ..............HK 35.4
Schielke, S. ........HK 10.9, HK 31.2
Schill, C. . ..................HK 12.13
Schilling, K. D. . . HK 10.4, HK 10.5,
HK 10.12
Schleichert, R. ...............HK 42.3
Schmid, Karl W. .............HK 23.1
Schmidt, A. .................HK 17.1
Schmidt, K. .................HK 30.2
Schmidt, R. . . HK 10.15, HK 10.16,
HK 24.4
Schmidt, Rudolf .............HK 41.1
Schmidt, T. . . HK 12.10, HK 14.14,
HK 14.25
Schmidt, Thomas ............HK 28.1
Schmidt-Boecking, Horst . . . . . HK 21.6
Schmitt, H. . . HK 12.10, HK 14.14,
HK 14.25, HK 28.1
Schmitt, L. ........HK 12.3, HK 28.1
Schmitt, Lars ......HK 26.3, HK 28.6
Schmitz, Norbert . . . . HK 6.5, HK 13.8
Schnare, H. .................HK 30.4
Schneider, I. . . . HK 10.1, HK 10.2,
HK 17.1
Schneider,RolandA. HK9.2,HK9.3,
HK 16.5, HK 27.2, HK 27.4
Schneider, Sonja .............HK 43.1
Schnitker, H. .................HK 5.7
Schönmeier, Peter ..........HK 12.23
Schönwasser, G. ............HK 10.11
Schönwaßer, G. ..............HK 39.4
Scholten, Olaf ...............HK 44.6
Schott, Wolfgang .....HK 7.1, HK 7.4
Schramm, S. ........HK 3.8, HK 29.5
Schrieder, G. ......HK 12.30, HK 21.5
Schroeder, W. . . . . . .HK 5.8, HK 12.24
Schuck, P. .................. HK 16.7
Schuck, Tanja ...............HK 47.4
Schürmann, Daniel ..........HK 18.6
Schüttauf, Andreas . . HK 6.5, HK 13.8
Schulday, Inez ..............HK 12.27
Schulte-Wissermann, Martin HK 14.37
Schumacher, Martin .........HK 26.1
Schwalm, D. ................HK 30.4
Schwalm, Dirk ...............HK 45.6
Schwamb, Michael . HK 9.26, HK 37.4
Schwartz, B. ................HK 42.4
Schwarz, C. . . . HK 12.3, HK 12.6,
HK 13.3
Schwarz, S. ................. HK 17.2
Schwarz, Thomas M. ..........HK 2.7
Schweda, K. ................HK 10.16
Schweitzer, Peter ............HK 19.4
Schweizer, B. .....HK 14.35, HK 21.5
Schwengner, R. . .HK 10.4, HK 10.5,
HK 10.12, HK 17.3, HK 30.4
Schwenzer, kai .....HK 23.2, HK 38.3
Scobel, W. ..................HK 40.5
Sefzick, T. .................HK 14.27
Segel, R. E. .................HK 25.4
Seibert, Joachim .............HK 48.3
Seifert, P. ..................HK 10.23
Seitz, Björn .................HK 19.3
Sendoval, A. .................HK 41.4
Senger, Peter ................HK 20.1
Servene, T. ..................HK 30.4
Seth, K. .....................HK 12.3
Sewtz, M. ....................HK 7.3
Seyboth, Janet ......HK 6.5, HK 13.8
Seyboth, Peter ......HK 6.5, HK 13.8
Seyfarth, H. ..................HK 5.9
Seyfarth, Hellmut HK 14.29, HK 14.31,
HK 42.5
Sharma, Hariprakash ........HK 10.13
Shawcross, M. ...............HK 10.8
Shevchenko, A. .HK 10.16, HK 10.25,
HK 10.28
Shin, Yanghwan .............HK 20.1
Shindo, M. .................HK 12.20
Shneidman, T. M. ....HK 10.18,
HK 10.19, HK 17.6
Sieber, T. ....................HK 7.5
Sieber, Thomas . . HK 14.20, HK 14.21
Siemssen, R. ................HK 25.4
Sikler, G. ...........HK 7.3, HK 17.2
Simon, Frank . . . HK 6.5, HK 13.8,
HK 14.16, HK 28.6
Simon, H. ...................HK 31.1
Simon, Haik .................HK 47.1
Simon, R. S. ................HK 13.5
Simon, Reinhard .............HK 20.1
Simons, L. M. ...............HK 26.6
Singh, A. K. ......HK 10.11, HK 39.2
Skibiński, R. ................HK 10.30
Skoda, S. ...................HK 30.4
Sletten, G. ..................HK 39.4
Slivova, Jana ................HK 41.3
Smit, F. ....................HK 10.28
Smyrski, J. ...................HK 5.7
Snover, K. A. ................HK 25.1
Sobiella, Manfred ............HK 48.3
Sobolev, Y. ................ HK 10.23
Söldner, Wolfgang ...........HK 16.4
Sohler, D. ...........HK 3.4, HK 39.1
Sonnabend, K. . HK 14.32, HK 18.2,
HK 18.3, HK 18.4
Spanier, Stefan ..............HK 49.2
Speidel, K.-H. . . HK 10.9, HK 30.3,
HK 31.2
Speth , Josef . . . HK 9.29, HK 9.30,
HK 43.1, HK 43.6
Spitzenberg, Thomas ........HK 38.3
Stanoiu, Mihai ...............HK 45.3
STAR - Collaboration .........HK 6.4
Stascheck, A. . . . . . HK 14.35, HK 21.5
Staudt, G. ...................HK 25.5
Stedile, F. ....HK 10.3, HK 10.4,
HK 10.12, HK 30.5, HK 39.3
Stefanescu, I. ................HK 17.3
Stefanova, E. ................HK 17.3
Steffens, E. ...................HK 5.9
Steffens, Erhard ............HK 14.31
Steidl, Markus ................HK 4.4
Steiger, T. D. ...............HK 25.1
Stein, Eckart ................HK 29.4
Steinhardt, T. ......HK 17.3, HK 30.4
Stejiger, Jos .................HK 28.3
Steltenkamp, S. ............HK 12.21
Stelzer, Herbert .............HK 41.1
Stinzing , F. . . . HK 5.8, HK 12.24,
HK 28.4
Stock, R. HK 6.2, HK 13.6, HK 13.7,
HK 33.2, HK 33.3, HK 41.4
Stock, Reinhard . HK 6.4, HK 14.23,
HK 33.4, HK 34.3
Stoyer, M. ...................HK 10.8
Strieder, Frank .....HK 18.5, HK 25.3
Strikman, M. I. ...............HK 2.1
Ströbele, H. . . . . HK 6.2, HK 13.6,
HK 33.2, HK 33.3, HK 41.4
Ströbele, Herbert . . . HK 20.1, HK 33.4
Ströebele, H. ................HK 13.7
Ströher, H. ...................HK 5.9
Ströher, Hans ....HK 14.29, HK 14.31
Stroth, Joachim .............HK 20.1
Struck, Christof .....HK 6.4, HK 34.3
Strzalkowski, A. ..............HK 5.7
Stuchbery, A. E. .............HK 30.3
Sturm, Christian ..............HK 8.3
Suarez Curieses, J. P. ........HK 11.2
Sulaksono, A. .......HK 3.8, HK 29.5
SUNS colaboration - Collaboration
HK 4.3
SUNS collaboration - Collaboration
HK 7.2
Suzuki, K. ..................HK 12.20
Suzuki, T. ..................HK 12.20
Swanson, H. E. ..............HK 25.1
Szerypo, J. ...................HK 7.5
Szilner, S. ...................HK 25.5
Szymanowski, Lech . HK 29.1, HK 38.1
Tanihata, I. ................. HK 9.27
TAPS- Collaboration . . . HK 20.4,
HK 28.7
TAPSand A2 - Collaboration HK 32.1
TAPS- and A2 - Collaboration HK 12.2
TAPS- und A2 - Collaboration HK 32.3
TAPS/A2 - Collaboration ....HK 32.2
Tarisien, M. ..................HK 7.3
Tatischeff, V. ................HK 25.5
Tcherniakhovski, Denis . . . . . HK 14.36
Tchernov, Nikolay ..........HK 14.29
Teichert, Jochen . . HK 14.34, HK 21.2
Teryaev, O. V. .....HK 38.1, HK 38.6
Teufel, A. ...................HK 28.4
Teughels, Stephanie ..........HK 45.3
the ISOLDE-Collaboration . . . .HK 17.2
Thelen, O. HK 10.5, HK 17.3, HK 30.4
Thibaud, J. P. ...............HK 25.5
Thirolf, P. ....................HK 7.3
Thoma, Ulrike ...............HK 36.2
Thomas, H. G. ......HK 7.6, HK 30.4
Thümmler, Thomas . HK 4.6, HK 11.4
Thummerer, S. ..............HK 45.4
Tilsner, Heinz ...............HK 33.5
Timmermans, R. ...........HK 14.19
Timmermans, R. G.E. ........HK 9.25
Timmermans, Rob ...........HK 44.6
Titze, O. .........HK 14.35, HK 21.5
Tjon, John ..................HK 44.6
Tjø. m, P. O. ...............HK 39.4
Tölle, R. .....................HK 5.7
Tohsaki, A. ..................HK 16.7
Toia, A. ...........HK 14.4, HK 14.5
Toia, Alberica ...............HK 13.2
Toman, R. ..................HK 39.3
Tomaseli, M. ................HK 9.27
Tonev, D. ...................HK 10.1
Tonev, Dimitar . . . . HK 10.7, HK 10.31
Torilov, S. ...................HK 45.4
Tovesson, Fredrik ...........HK 10.33
Trautmann, Wolfgang ........HK 47.6
Traxler, M. .........HK 14.4, HK 14.5
Traxler, Michael .............HK 13.2
Trinks, Uwe ..........HK 7.1, HK 7.4
Trnka, D. ...................HK 12.2
Tsekhanovitsch, I. ..........HK 10.32
Tumino, A. ..................HK 45.4
Turzó, Ketel .................HK 13.4
Tyminski, Zbigniew ..........HK 48.6
Typel, Stefan ...... HK 18.7, HK 43.3
Uhlig, Florian ................HK 20.2
Ulicny, M. .......HK 12.19, HK 12.19
University of Leuven, GANIL, University
of Sofia, FLNR-JINR Dubna,
University of Gottingen. -
Collaboration ...........HK 50.3
Ur, C. ............HK 10.11, HK 45.4
Ur, C. A. ....................HK 10.5
Urban, W. .........HK 3.3, HK 10.17
Uusitalo, J. ..................HK 30.2
Uzikov, Yu. ........HK 5.9, HK 12.22
van Asselt, W. ...............HK 42.1
van Beuzekom, Martin .......HK 28.3
vandenBerg,A.M. HK3.4,HK7.7,
HK 10.14, HK 10.15, HK 10.16,
HK 10.30, HK 24.2, HK 25.4,
HK 39.1
van den Berg, Ad ............HK 20.6
van der Grinten, M. G.D. . . . HK 10.21
van der Veen, S. .............HK 42.1
van der Werf, S. Y. ...........HK 3.4
van Hees, Hendrik ...........HK 23.3
Vanderhaeghen, Marc .........HK 2.6
Varentsov, V. .................HK 7.3
Vassiliev, A. ..................HK 5.9
Vassiliev, Alexandre . . . . HK 14.29,
HK 14.31, HK 42.5
Vereshagin, V. V. ............HK 9.20
Vidal, Michael .......HK 6.5, HK 13.8
Vlassov, N. ..................HK 12.3
Vogel, C. ...................HK 14.18
Vogt, K. HK 3.7, HK 10.26, HK 14.32,
HK 18.2, HK 18.3, HK 18.4
Volz, S. . . . . HK 10.25, HK 10.26,
HK 14.32, HK 18.2, HK 18.3,
HK 18.4
von Brentano, P. . .HK 3.1, HK 10.1,
HK 10.2, HK 10.3, HK 17.1,
HK 30.1, HK 30.5, HK 39.3
von Brentano, Peter .........HK 10.7
von Garrel, H. . . HK 10.3, HK 10.12,
HK 30.5, HK 39.3
von Geramb, Heinrich V. .....HK 43.5
von Hodenberg, M. HK 14.14, HK 28.1
von Hodenberg, Martin .....HK 12.10
von Neumann-Cosel, P. . . HK 10.16,
HK 10.20, HK 10.25, HK 10.28,
HK 17.4
von Oertzen, W. .............HK 45.4
von Smekal, Lorenz ...........HK 8.1
von Wrochem, Florian .......HK 46.4
Vranic , D. HK 6.2, HK 13.7, HK 33.3,
HK 41.4
Vranic, Danilo ......HK 33.4, HK 41.1
Vranić, D. .........HK 13.6, HK 33.2
Vyvey, Katrien ...............HK 45.3
Index of Authors
WA98 - Collaboration .........HK 6.3
Waasem, T. ..................HK 7.6
Wagner, A. .......HK 10.5, HK 10.12
Wagner, Boris ..............HK 14.23
Wagner, G. J. ......HK 46.1, HK 46.5
Wagner, Gerhard J. ..........HK 46.4
Wagner, M. ........HK 5.8, HK 12.24
Wagner, Robert ....HK 28.2, HK 28.6
Walcher, Th. ................HK 21.4
Walker, T. G. ...............HK 42.4
Wambach, J. . .HK 10.20, HK 10.25,
HK 10.28
Wambach, Jochen HK 9.22, HK 16.6,
HK 36.1
Wang, H. ...................HK 9.27
Ward, D. ...................HK 10.10
Warr, N. . . .HK 7.6, HK 10.6, HK 17.3
Watzlawik, S. . . . . . HK 14.35, HK 21.5
Webb, R. ....................HK 28.4
Weber, C. ...........HK 7.3, HK 17.2
Weber, Hans J ..............HK 9.28
Weber, T. ........HK 14.11, HK 21.4
Weick, H. ..................HK 12.20
Weidlich, U. .................HK 46.1
Weigert, Heribert ............HK 44.2
Weil, J. .....................HK 25.5
Weiland, T. .................HK 21.5
Weinheimer, Christian HK 4.6, HK 11.4
Weise, H. ...................HK 21.5
Weise, W. ...................HK 12.3
Weise, Wolfram . . .HK 2.7, HK 9.3,
HK 9.5, HK 9.6, HK 16.5, HK 27.2,
HK 27.4, HK 38.5
Weiskopf, Christoph ........HK 12.12
Weiss, C. HK 9.16, HK 9.17, HK 23.6,
HK 38.6
Weisshaar, D. ...............HK 17.3
Weissman, L. ................HK 31.1
Weißhaar, D. ........HK 7.6, HK 10.6
Wellenstein, Hermann .......HK 14.15
Wellinghausen, A. ...........HK 42.4
Welsch, Carsten .............HK 21.6
Werner, V. HK 3.1, HK 10.3, HK 10.4,
HK 30.1, HK 30.5, HK 39.3
Wessels, Johannes P. ........HK 41.2
Wetzel, Stefan .....HK 19.6, HK 23.5
Wetzlar, A. ...................HK 6.2
Wetzler, A. . . . .HK 13.6, HK 13.7,
HK 33.2, HK 33.3, HK 41.4
Wetzler, Alexander ...........HK 33.4
Widmann, Eberhard .........HK 24.3
Wiedner, U. .................HK 12.3
Wiescher, Michael ...........HK 25.2
Wiese, Uwe-Jens .............HK 15.1
Wiesmann, Michael .HK 28.2, HK 28.6
Wilbert, S. ..................HK 31.1
Wilfart, A. ....................HK 7.5
Willmann, L. . . .............HK 14.19
Wilms, Andrea ..............HK 31.5
Wilschut, H. W. . . .HK 14.19, HK 25.4
Wilschut, Hans ..............HK 20.6
Wilson, J. N. . . . . . HK 10.10, HK 39.4
Windelband, Bernd ..........HK 41.1
Winkler, M. ................HK 12.20
Winkler, S. HK 14.1, HK 14.3, HK 48.4
Winter, G. ..................HK 30.4
Winter, Peter .................HK 5.6
Wirth, Hans-Friedrich .......HK 10.31
Wirth, S. . HK 5.8, HK 12.24, HK 28.4
Wise, T. ....................HK 42.4
Wissmann, Frank ............HK 26.1
Wita̷la, H. ................. HK 10.30
Wörtche, H. J. . . HK 7.7, HK 10.15,
HK 10.16, HK 10.30, HK 24.2,
HK 25.4, HK 39.1
Wörtche, Heinrich ...........HK 48.5
Wolf, Gy. ....................HK 13.9
Wolschin, Georg .............HK 27.5
Wolter, Hermann . HK 18.7, HK 43.3,
HK 47.5
Worch, J. . . . HK 12.10, HK 14.14,
HK 14.25, HK 28.1
Wu, C. Y. ...................HK 10.8
Wüstenfeld, Jörn ............HK 14.7
Wuestner, P. ...............HK 14.27
Xu, Zhe ...........HK 9.14, HK 44.3
Yamazaki, T. ...............HK 12.20
Yaschenko, S. .................HK 5.9
Yepes, Pablo ................HK 34.3
Yoneyama, T. ..............HK 12.20
Zabrodin, Eugene ............HK 27.1
Zalikhanov, B. ................HK 5.9
Zamfir, N. V. ................HK 10.8
Zaranek , J. ....HK 6.2, HK 13.6,
HK 13.7, HK 33.2, HK 33.3
Zaranek, Jacek .....HK 33.4, HK 41.4
Zegers, R. ..................HK 10.14
Zell, K. O. .........HK 10.1, HK 10.2
Zetenyi, M. .................HK 13.9
Ziegler, R. ...................HK 28.4
Zielinska-Pfabe, Malgorzata . . HK 47.5
Zilges, A. HK 3.7, HK 10.8, HK 10.25,

HK 10.26, HK 10.27, HK 14.32,
HK 18.2, HK 18.3, HK 18.4
Zilges, Andreas ..............HK 15.3
Zimmer, O. ................HK 10.21
Zimmer,Oliver ...HK7.1,HK7.4,
HK 50.2
Zmeskal, H. .................HK 26.6
Zolnai, L. .....................HK 3.4
Zschocke, Sven ..............HK 23.4
Zuber, Kai ...................HK 4.8
Zumbruch, P. ................HK 14.6
Zumbruch, Peter ............ HK 14.2
Index of Authors
Zwoll, K. .....................HK 5.9
Zyuzin, A. ...................HK 25.1