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CALIFA, a Calorimeter for the R3B/FAIR experiment D. Cortina-Gil, for the R3B collaboration Universidad de Santiago de Compostela The R3B experiment (Reactions with Relativistic Radioactive Beams) at FAIR (Facility for Antiproton and Ion Research) is a versatile setup dedicated to the study of reactions induced by high-energy radioactive beams. It will provide kinematically complete measurements with high efficiency, acceptance and resolution, making possible a broad physics program with rare-isotopes that addreses very relevant questions such as the structure of the atomic nucleus at the extreme of nuclear stability or reactions of astrophysics interest. CALIFA (CALorimeter for In-Fligth emitted pArticles), is a complex detector based on scintillation crystals, that will surround the target of the R3B experiment. CALIFA will act as total absorption gamma-calorimeter and spectrometer, as well as identifier of charged particles from target residues. This versatility is its most challenging requirement, demanding a huge dynamic range, to cover from low energy gamma-rays up to 300 MeV protons. This fact, along with the high-energy of the beams determine the conceptual design of the detector that will be presented in this paper together with the technical solutions proposed for its construction. HF 7 5:30 PM Atomic Number Determination of Fission Products by Digital Techniques J. Matarranz, I. Tsekhanovich Universite de Bordeaux-1/CENBG, 33175 Gradignan Cedex, France A.G. Smith, J.A. Dare, L. Murray, A.J. Pollitt Department of Physics and Astronomy, The University of Manchester, M13 9PL Manchester, UK T. Soldner, U. Koster Institut Laue-Langevin, 6 rue J. Horowitz, 38042 Grenoble, France D.C. Biswas Bhabha Atomic Research Centre, Trombay, 400085 Mumbai, India Determination of atomic numbers of non-accelerated fission products by non-radiative methods is a longstanding experimental problem. Correct fragment identification (i.e., by mass and atomic number) is relevant to the production probability (yield) of nuclei in low-energy fission reactions and is of interest to different domains of research incuding nuclear data for industry and spectroscopic studies of exotic nuclei. The difficulty in atomic number assignment is determined by the difference in the energy lost in a detector by fragments with adjacent nuclear charges. This difference is small and comparable to the detector energy resolution, whereas the range of nuclei to identify is relatively wide. An additional complication comes also from the fact that these subtle changes in the loss of energy between nuclei do not remain the same over the range of kinetic energies with which nuclei are produced in fission. Therefore assignment of atomic numbers to fission products is possible only if thorough care is given to the collection of the ionisation produced in the detector and to the consequent electronic treatment of signals. This approach is implemented in the design of the two-arm spectrometer of fission products (STEFF) recently built at the Manchester University. In addition to the identification of masses, by the double energy / double velocity measurement, the spectrometer is capable of delivering information on nuclear charges of fission products, on the event-by-event basis. This is achieved from the analysis of the fragments’ pulse shapes and ranges in gaseous detectors, both obtained using digital electronics in conjunction with specially developped algorithms. The technique has been optimised with beams of fission products with known kinetic energy and isobaric composition, as well as tested in the 235 U(nth, f) experiment at the ILL in France. The details of the method will be presented and explained, results on the identification of atomic numbers in the light group of fission products will be demonstrated and the perspectives discussed. 134
HF 8 5:45 PM Beta-delayed Neutron Spectroscopy Using Trapped Ions R.M. Yee, E.B. Norman, LLNL/UC Berkeley. N.D. Scielzo, S. Padgett, M. Pedretti, LLNL. J.A. Clark, J.P. Greene, A.F. Levand, A. Perez-Galvan, B.J. Zabransky, ANL. S. Caldwell, G. Savard, M.G. Sternberg, J. Van Schelt, ANL/U Chicago. D. Lascar, R.E. Segel, ANL/Northwestern University. K.S. Sharma, U. Manitoba. Beta-delayed neutron emission is of interest to both the pure and applied nuclear physics communities. For example, branching ratios are needed to determine how the short-lived neutron-rich isotopes synthesized in the astrophysical r-process decay back to stability. Also, neutron energy spectra are required for the design of nuclear reactors. Reliable measurements of delayed neutron properties can be performed with high precision using a combination of sophisticated ion-trapping techniques and modern radiation-detection systems. When a radioactive ion decays in the trap, the recoil-daughter nucleus and emitted particles emerge from the ¡ 1 mm 3 trap volume with minimal scattering and propagate unobstructed through vacuum. These properties allow the momentum and energy of the emitted neutron to be precisely reconstructed from the nuclear recoil. Spectroscopy of delayed neutrons can be performed with high efficiency and energy resolutions approaching 3%. The results from a recent campaign to measure delayed neutron properties of interest to nuclear reactors and r-process nucleosynthesis will be presented. On-going activities to develop a dedicated ion trap and detector system to perform new measurements at CARIBU will be discussed. This work was supported by U.S. DOE under Contracts DE-AC02-06CH11357 (ANL), DE-AC52-07NA27344 (LLNL), and the Department of Homeland Security. Session IA Plenary Wednesday Wednesday March 6, 2013 Room: Met East at 8:30 AM IA 1 8:30 AM Physics of Neutron Interaction with U-238 Nucleus: New Developments and Challenges R. Capote International Atomic Energy Agency, NAPC-Nuclear Data Section M. Sin University of Bucharest, Romania A. Trkov Jozef Stefan Institute, Slovenia M.W. Herman National Nuclear Data Center, Brookhaven National Laboratory, USA The latest release of the EMPIRE-3.1 system (codename Rivoli) is being used in the advanced modeling of neutron induced reactions on U-238 nucleus aimed at improving our knowledge of the neutron scattering and prompt fission neutron emission. The reaction model includes - a new rotational-vibrational dispersive optical model potential couplings the low-lying collective bands of vibrational character observed in eveneven actinides; - the Engelbretch-Weidenmuller transformation allowing for inclusion of compound-direct interference effects enhanced by a dispersive treatment of the optical model potential; - a multi-humped fission barrier with absorption in the secondary well described within the optical model for fission; - 135
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ND2013 2013 International Nuclear D
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Session BF Evaluated Nuclear Data L
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Session DD Nuclear Structure and De
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Hale, G. n+ 12 C Cross Sections fro
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Domula, A. New Nuclear Structure an
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Session KC Evaluated Nuclear Data L
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MacCormick, M. Survey and Evaluatio
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ments. Ivanova, T. Uncertainty Asse
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Arnold, C. Precision Velocity Measu
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19 Abridged Agenda Sunday March 4,
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21 Tuesday March 5, 2013 Time Met E
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23 Thursday March 7, 2013 Time Met
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Book of Abstracts Session AA ND2013
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multi-foil Parallel Plate Avalanche
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A Regional Coupled-channel Dispersi
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show the versatility of the code in
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[h] Table 1: Comparison of all the
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step was to determine which detecto
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In an effort to maintain the qualit
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Advances in Reactor Physics Linking
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sponsored the work presented in thi
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A revolutionary nuclear data system
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done in Ref. [1]. We demonstrate th
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CD 4 2:40 PM Development of a Syste
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with a central cavity where small s
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C. Arnold, E. Bond, T. Bredeweg, M.
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DA 3 4:20 PM Characterization and P
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detectors at the newly constructed
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Lead and lead-based alloys are - am
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of the setup. One option explored i
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DC 2 4:00 PM Improved Capture Gamma
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DC 5 5:00 PM Thermal Neutron Cross
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M.R. Gilbert, L.W. Packer, S. Lille
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Correlations Between Nuclear Charge
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Community’s 7th Framework Program
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we achieve very good separation of
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analysis of neutron leakage spectru
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a lower nuclear temperature than th
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Tungsten occurs naturally in five i
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for the combined use of integral ex
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in XUNDL and bibliographic informat
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for 89 fission products (representi
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Impact of the Energy Dependent DDXS
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from non 1/v behavior of nuclei. Mo
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evaluation (including covariances)
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system without isotope separation.
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NC 3 11:20 AM Propagation of Nuclea
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Results of the first complete compi
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Arjan Koning and Dimitri Rochman Nu
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calculating their mathematical mome
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The 33 S(n,α) cross section is of
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OA 2 2:00 PM Event-by-Event Fission
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available for ENDF/B-VII. The obser
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egions: the resolved resonances ran
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y the screening potential predicted
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[1] Y. Kojima et al., Nucl. Instr.
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y the emitted neutron. The Versatil
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enchmarking, the excitation functio
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PA 1 3:30 PM Investigation of Neutr
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as well as for a variety of Minor A
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Society, Vol. 59, No. 2, August 201
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A. Hermanne, R. Adam-Rebeles Cyclot
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We measured the isomeric yield rati
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the trends in the experimental data
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However, experiments often measure
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Statistical description of the gamm
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fragments formed are highly neutron
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F. Farget, J. Pancin GANIL, Caen, F
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ZPR-6/10 cores were applied as comp
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each nucleus in agreement with unce
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atios) is performed. In relation to
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school in science or engineering. I
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programs demanding only one compuls
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gamma-ray spectra will be theoretic
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RA 3 11:20 AM A Microscopic Theory
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Laboratory, Oak Ridge, Tenn., Novem
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Session RD Safeguards and Security
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Seeking Reproducibility in Fast Cri
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RE 4 11:40 AM Verification of Curre
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that a lot of them generally descri
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R. Hirschi, A. Hungerford, G. Magko
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- a density of levels too low for w
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the MONTEBURNS(1.0)-MCNP5-ORIGEN(2.
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The Nuclear Science References (NSR
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and applications using statistical
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Shielding objects are assembled fro
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The knowledge of neutron-induced re
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thus for the second time after the
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the global children health and cons
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Lawrence Livermore National Laborat
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The Russian Nuclear Data Library fo
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OECD Nuclear Energy Agency consider
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For experimental determination of t
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The European Activation SYstem has
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Neutron capture measurements of dys
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[1] H. Penttilä, P. Karvonen, T. E
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Measurement of Activation Cross Sec
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PR 66 Processing and Validation of
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law of the temperature ratio (RT =
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PR 74 Resonance Analysis of the 233
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Study of Various Potentials in Heav
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experimental data and for the produ
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fuel cycle impose tight requirement
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they do not satisfy (for example, b
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Differential Cross Sections for the
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extends the previous evaluation and
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various benchmark tests. The mainly
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PR 104 Evaluations for n+ 54,56,57,
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PR 109 Recent LAQGSM Developments a
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PR 113 Modelling of Spallation Sour
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Jagiellonian University, Reymonta 4
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PR 120 Coupled-Channel Models of Di
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PR 124 Nuclear Data Evaluation and
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physicist. - There is no perfect se
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Manturov, M.N. Nikolaev, A.M. Tsibo
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Vasiliev, W. Wieselquist and H. Fer
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Author Index 1, Vojtěch Rypar, PR
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HF 5, KD 4, LA 3, LA 6, LA 7, LA 8,
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Dunn, M. E., BF 4, RC 3 Dupont, Emm
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Gulliford, Jim, CE 1 Gunsing, Frank
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Kahl, David, HD 7 Kahler, A. C., CA
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Lehaut, G., PD 6 Leinweber, Greg, L
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Munkhsaikhan, J., HC 7 Mura, Luis F
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Prael, Richard E., PE 5 Praena, Jav
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Sheets, S., CF 2 Shen, Qingbiao, PC
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Typel, S., JA 3 Tyutyunnikov, S., L
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