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KF 2 2:00 PM MANTRA: An Integral Reactor Physics Experiment to Infer the Capture Cross-Sections of Actinides and Fission Products in Fast and Epithermal Neutron Spectra G. Youinou, T. Maddock, J. Berg, P. Palmiotti, M. Salvatores Idaho National Laboratory R. Pardo, F. Kondev, M. Paul, C. Nair, T. Plachan, R. Vondrasek, S. Kondrashev Argonne National Laboratory G. Imel, J. Nimmagadda Idaho State University This paper will present an update on an on-going integral reactor physics experiment whose objective is to infer the effective neutron capture cross-sections for most of the actinides of importance for reactor physics and fuel cycle studies. Some fission products are also being considered. The principle of the experiment is to irradiate very pure actinide samples in the Advanced Test Reactor at INL and, after a given time, determine the amount of the different transmutation products. The determination of the nuclide densities before and after neutron irradiation will allow inference of effective neutron capture cross-sections. The list of actinides is the following: Th-232, U-233, U-235, U-236, U-238, Np-237, Pu-239, Pu-240, Pu-242, Pu-244, Am-241, Am-243, Cm-244 and Cm-248. The list of fission products is the following: Sm-149, Eu-153, Cs-133, Rh-103, Ru-101, Nd-143, Nd-145, Pd-105. In order to obtain effective neutron capture cross-sections corresponding to different neutron spectra, three sets of actinide samples are being (or will soon be) irradiated: the first one is filtered with cadmium and the other two are filtered with boron different thicknesses (5 mm and 10 mm). The irradiation of the 5-mm-boron-filtered samples started in February 2012 and that of the cadmium-filtered one is scheduled to start in the September-October 2012 timeframe. Both irradiations should be completed by the end of this year. The determination of the atom densities before and after irradiation will be carried out both at INL and ANL, using respectively the ICPMS available at the Analytical Lab and the AMS of the ATLAS facility. In order to provide accurate measurements the ATLAS facility had to undergo some upgrade such as the implementation of a laser ablation technique in the ion source and of a highly efficient sample changer. This work is supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under DOE Idaho Operations Office Contract DE-AC07-05ID14517 as well as by the ANL Contract DE-AC02-06CH11357 and by the ATR National Scientific User Facility. KF 3 2:20 PM Measurements of Capture Gamma Rays from the Neutron Resonances of 74 Se and 77 Se at J-PARC/MLF/ANNRI J. Hori, H. Yashima Kyoto University S. Nakamura, K. Furutaka, K. Y. Hara, H. Harada, K. Hirose, A. Kimura, F. Kitatani, M. Koizumi, M. Oshima, Y. Toh Japan Atomic Energy Agency M. Igashira, T. Katabuchi, M. Mizumoto Tokyo Institute of Technology T. Kamiyama, K. Kino, Y. Kiyanagi Hokkaido University 162
Selenium-79 is one of the most important long-lived fission products in the transmutation study. However, there is no experimental cross section data of 79 Se because it is difficult to prepare a sample. Therefore, we have started a systematic measurement of neutron capture cross sections and gamma-ray spectra of stable Se isotopes in order to improve the evaluated neutron capture cross sections of 79 Se. In this work, we measured the capture gamma rays from the neutron resonances of 74 Se and 77 Se. Since 74 Se is an even-even nucleus in which neutrons are filled up the 2p 1/2 orbit from a simple shell model, the strong correlation between initial and final states of the primary gamma-ray transitions is expected. Selenium-77 is the only stable Se isotope with odd mass number. So the neutron capture gamma-ray spectra of 77 Se are expected to contain useful information for evaluation of 79 Se with odd mass number. A neutron timeof-flight method was adopted for the measurements with a 4π Ge spectrometer installed at the Accurate Neutron-Nucleus Reaction measurement Instrument (ANNRI) in the J-PARC Material and Life science experimental Facility (MLF). The gamma-ray pulse-height spectra corresponding to the 27-eV resonance of 74 Se and the 113-, 212-, 291-, 342-, 690- and 864-eV resonances of 77 Se were obtained by gating on the TOF regions, respectively. The relative intensities of those primary transitions were derived and compared with the previous experimental data. For the 27-eV resonance of 74 Se, a strong primary transition to the 293-keV state was observed. As for 77 Se, the quite differences of the decay pattern were found between the resonances. This work was supported by JSPS KAKENHI Grand Number 22226016. KF 4 2:40 PM Measurements of Thermal Neutron Capture Cross Sections of 136 Ce, 144 Sm, 156,158 Dy, and 168 Yb Jeong-Yeon Lee, Yeongduk Kim Department of Physics, Sejong University, Seoul 143-747, Korea Gwang-Min Sun Korea Atomic Energy Research Institute, Daejeon 305-353, Korea For several low abundance stable nuclei, the thermal neutron capture cross sections are not well measured, while the cross sections for isotopes with high abundances are already well measured. Therefore, we can obtain the cross sections of low abundant isotopes, which are not known well, by comparing the yields of gammas from the neutron captures by various isotopes in the foils. Our experiments, different from the commonly used method of using gold foil as reference, are performed using natural foils for which we know the relative abundances of all isotopes and thermal neutron capture cross sections. The advantage of this method is the cancellation of potential systematic errors from thermal neutron flux, flux profile, foil thickness, foil size, and irradiation time. We have measured the capture cross sections of 136 Ce, 144 Sm, 156,158 Dy, and 168 Yb isotopes with natural foils, using the high thermal neutron flux from the reactor HANARO at KAERI, and have obtained new cross section values for 136 Ce(n,γ), 144 Sm(n,γ), 156,158 Dy(n,γ), and 168 Yb(n,γ) reactions. Session LA Neutron Cross Section Measurements Wednesday March 6, 2013 Room: Met East at 3:30 PM LA 1 3:30 PM Plutonium and Uranium Prompt-Fission-Neutron Energy Spectra (PFNS) from the Analysis of Neutron Data from two US Nuclear Explosions 163
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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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former case, more realistic covaria
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WInfried Zwermann, Kiril Velkov, An
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LA-UR-12-23712 The ENDF/B-VII.1 [1,
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comparison of results C/E of fissio
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Session GA Evaluated Nuclear Data L
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Session GC accelerator applications
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Session GD Antineutrinos Tuesday Ma
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M. Fallot, S. Cormon, M.Estienne, V
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for extraction of very rare isotope
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and neutron multiplicity, informati
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as Monte Carlo simulations, and inc
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on its surface. The amplification t
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direction was recently used at n TO
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were chemically separated and the 2
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Page 166 and 167: LA 5 5:00 PM Measurements relevant
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Page 182 and 183: LE 5 5:00 PM Method of Best Represe
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Page 194 and 195: NC 3 11:20 AM Propagation of Nuclea
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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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