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Advances in Reactor Physics Linking Research, Industry, and Education, Knoxville, TN, April 15 20, 2012. [3] N. M. Larson, Updated Users’ Guide for SAMMY: Multilevel R-Matrix Fits to Neutron Data Using Bayes’ Equations, Report ENDF-364 and ORNL/TM-9179/R6, Oak Ridge National Laboratory, Oak Ridge, TN (May 2003). Also report ORNL/TM-9179/R7 (2006). [4] M. B. Chadwick et al., “ENDF/B- VII.1 Nuclear Data for Science and Technology: Cross Sections, Covariances, Fission Product Yields and Decay Data,” Nuclear Data Sheets, 112, 2887 (2011). [5] S. F. Mughabghab, Atlas of Neutron Resonances: Thermal Cross Sections and Resonance Parameters, Elsevier Publisher, Amsterdam (2006). [6] Neutron Scattering Lengths found at http://www.ati.ac.at/ ∼ neutropt/scattering/table.html. [7] A. Trkov et al., “Covariances of Evaluated Nuclear Cross Section Data for 232 Th, 180,182,183,184,186 W and 55 Mn,” Nuclear Data Sheets, 112, 3098 (2011). [8] P. Batistoni et al., “Neutronics Benchmark Experiment on Tungsten,” J. Nucl. Materials, 329 333, 683 (2004). [9] ICSBEP 2006, International Handbook of Evaluated Criticality Safety Benchmark Experiments, Technical Report NEA/NSC/DOC(95)03, NEA Nuclear Science Committee, Nuclear Energy Agency, OECD 2006, Paris, France. Session CA Neutron Resonances Monday March 4, 2013 Room: Met East at 1:30 PM CA 1 1:30 PM Evaluation of Neutron Resonance Cross Section Data at GELINA Peter Schillebeeck, Bjorn Becker, Federica Emiliani, Jan Heyse, Kim Kauwenbergs, Stefan Kopecky, Willy Mondelaers, Arjan Plompen, Peter Siegler, Konstantin Volev EC - JRC - IRMM, Retieseweg 111, B - 2440 Geel, Belgium Vladimir Pronayev IPPE, Obninsk, Russia Ivan Sirakov INRNE, Sofia, Bulgaria Cristian Massimi INFN Bologna, Italy Over the last decade, the EC - JRC - IRMM, in collaboration with other institutes such as INRNE Sofia, INFN Bologna, IPPE Obninsk and ORNL, has made an intense effort to improve the quality of neutroninduced cross section data in the resonance region. These improvements relate to both the infrastructure of the facility and the measurement, data reduction and analysis procedures. As a result total and reaction cross section data in the resonance region with uncertainties better than 0.5% and 2%, respectively, can be produced together with evaluated data files for both the resolved and unresolved resonance region. A special format has been developed to provide the experimental data with full covariance information. The format is very convenient to account for all uncertainty components whilst avoiding bias effects when model parameters are determined by least squares adjustment of experimental data. The methodology to produce full ENDF compatible files, including covariances, will be illustrated by the production of resolved resonance parameter files for Cd and W and an evaluation for 197 Au in the unresolved resonance region. The latter, which is part of a project to improve the 197 Au(n,γ) cross section standard, will be explained in detail, starting from the data reduction up to a parameterization of averaged cross section data based on the R-matrix formalism combined with level statistical model distributions. 40
CA 2 2:00 PM 239 Pu Resonance Evaluation for Thermal Benchmark System Calculations L. C. Leal Oak Ridge National Laboratory (ORNL), P.O. Box 2008, Oak Ridge, TN 37831, USA, leallc@ornl.gov G. Noguère, C. de Saint Jean Commissariat à l’Energie Atomique (CEA) Cadarache, F-13108 Saint Paul Les Durance, France A. C. Kahler Los Alamos National Laboratory (LANL), P.O. Box 1663, Los Alamos, NM 87545, USA Analyses of thermal plutonium solution critical benchmark systems have indicated a deficiency in the 239Pu resonance evaluation. To investigate possible solutions to this issue, the Organisation for Economic Co-operation and Development (OECD) Nuclear Energy Agency (NEA) Working Party for Evaluation Cooperation (WPEC) established Subgroup 34 to focus on the reevaluation of the 239Pu resolved resonance parameters. In addition, the impacts of the prompt neutron multiplication (nubar) and the prompt neutron fission spectrum (PFNS) have been investigated. The objective of this paper is to present the results of the 239Pu reevaluation effort. In the 1980s and early 1990s, Derrien et al. [1] performed a 239Pu evaluation in a collaborative work, including CEA and ORNL. At that time, due to computer limitations for data storage and processing, a decision was made to split the resonance region in three parts, namely, 10- 5 eV to 1 keV, 1 keV to 2 keV, and 2 keV to 2.5 keV. The evaluation was accepted for inclusion in the ENDF and JEFF nuclear data libraries and is still included in the latest releases of ENDF, the ENDF/B- VII.1, and the JEFF-3.1 libraries. While the evaluation was performed based on high-resolution data, mainly transmission data [2] measurements taken at the Oak Ridge Electron Linear Accelerator (ORELA) at ORNL, no benchmark testing was done at the time the evaluation was released. Later, benchmark calculations indicated deficiencies in the 239Pu evaluation in reproducing integral results. Additional issues with the previous evaluation can be attributed to the use of three distinct sets of resonance parameters. Specifically, the cross sections calculated at the energy boundary of two consecutive, disjoint resonance parameter sets could be different, leading to a discontinuity. Another concern relates to data uncertainty assessments using resonance parameter covariance data. For data uncertainty analyses, the use of a single resonance parameter set covering the entire energy region is preferable because the disjoint set of resonance parameters does not permit the determination of uncertainty correlations in the entire energy region. Hence, the decision was made to combine the three sets of resonance parameters and redo the evaluation. The task of generating a single resolved resonance region was achieved because computer resources have improved substantially since the previous 239Pu evaluation effort. As a result, a resonance parameter evaluation was completed at ORNL in 2008 by Derrien, and this 239Pu evaluation covers the energy range 10-5 eV to 2.5 keV [3]; however, the evaluation was unable to improve benchmark results and was not proposed for inclusion in either the ENDF or JEFF project. At about the same time as the work was being performed at ORNL, Bernard et al. [4] at CEA/Cadarache performed a reevaluation of the 239Pu resonance parameters and nubar. Since the resonance evaluation for the whole energy region was not available, the work performed by Bernard was based on the JEFF-3.1 evaluation (i.e., with the three disjoint sets of resonance parameters). Bernard’s 239Pu evaluation improved the results of benchmark calculations; however, the evaluation did not provide resonance parameter covariance data. By building upon the previous 239Pu evaluation work efforts, WPEC Subgroup 34 has been able to produce a new 239Pu evaluation that provides improved benchmark performance for thermal plutonium solution systems. The final paper will describe the procedure used in reevaluating the 239Pu resonance parameters. The computer code SAMMY was used in the analysis of the differential data. The resonance parameters of Reference [3], covering the energy region 10-5 eV to 2.5 keV, were used in the evaluation. The performance of the new evaluation in benchmark calculations will be presented. The U.S. Department of Energy Nuclear Criticality Safety Program and the OECD/NEA data bank 41
Page 1 and 2: ND2013 2013 International Nuclear D
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Page 5 and 6: Session DD Nuclear Structure and De
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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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Strontium-82 Production at ARRONAX
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A. Guertin, C. Duchemin, F. Haddad,
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expected via an (n,γ) reaction. Pr
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Shinsuke Nakayama, Shouhei Araki, Y
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specific feature of the procedure e
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good timing characteristics.Example
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Materials and Measurements, Retiese
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derive reliable covariances from ta
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Concerns about the limits of worldw
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Accurate and reliable nuclear data
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Facility (HRIBF) at Oak Ridge Natio
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CALIFA, a Calorimeter for the R3B/F
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a modified Lorentzian model (MLO) o
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enchmark for existing atomic mass p
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A significant breakthrough in our t
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and the neutron and proton emission
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horizontal plane, the measured posi
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The high precision of recent measur
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Session JF Neutron Cross Section Me
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Alamos National Laboratory, Los Ala
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During more than four decades since
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KC 2 2:00 PM R-matrix Analysis for
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new covariance contributions to the
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importance in nuclear technology, a
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source SINQ (Swiss Spallation Neutr
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KF 2 2:00 PM MANTRA: An Integral Re
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J. P. Lestone, E. F. Shores Los Ala
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LA 5 5:00 PM Measurements relevant
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elow the neutron separation energy
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The A = 130 Solar-System r-process
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espectively, and identified approxi
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W. Zwermann Gesellschaft fuer Anlag
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LC 5 5:00 PM Uncertainty Study of N
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solving the quantum three-body prob
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Session LE Evaluated Nuclear Data L
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LE 5 5:00 PM Method of Best Represe
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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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