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DC 2 4:00 PM Improved Capture Gamma-Ray Libraries for Nonproliferation Applications B. W. Sleaford, L.A. Bernstein, J.E. Escher, W.E. Ormand, N.C. Summers, Lawrence Livermore National Laboratory, Livermore, CA 94551,. M.S. Basunia, R.B. Firestone, A.M. Hurst, A.M. Rogers, Lawrence Berkeley National Laboratory, Berkeley, CA 94720. K. AbuSaleem, Department of Physics, The University of Jordan, Amman, Jordan. F. Becvár, M. Krticka, Charles University in Prague, Faculty of Mathematics and Physics, Czech Republic. T. Belgya, L. Szentmiklosi, Centre for Energy Research, Hungarian Academy of Sciences, Budapest, Hungary. H. Choi, Seoul National University, Korea. Zs. Revay, Forschungsneutronenquelle Heinz Maier-Leibnitz (FRM II), Technische Universität, Munich, Germany. Ch. Genreith, M. Rossbach, Institute for Energy and Climate Research, IEK-6, Forschungszentrum, Juelich, Germany. F. Gunsing, CEA Saclay, Gif-sur-Yvette, France. The neutron-capture reaction is of fundamental use in identifying and analyzing the gamma-ray spectrum from an unknown object as it gives unambiguous information on which isotopes are absorbing the neutrons. There are known data gaps in the Evaluated Nuclear Data File (ENDF) libraries used by transport codes which are critical to a range of nonproliferation applications, particularly the actinides. The Evaluated Gamma-ray Activation File (EGAF) is a thermal neutron-capture database of discrete-line spectra and cross sections for over 260 isotopes measured at the Budapest and Munich Reactors (FRM II). For medium to heavy nuclei, the unresolved quasi continuum part of the gamma cascades are not experimentally available and is modeled in the evaluation process using the statistical nuclear structure code DICEBOX developed at Charles University in Prague. ENDF libraries require gamma-ray production cross sections for neutron energies up to 20 MeV and accordingly, we plan to continue the Dicebox approach through the resolved resonance region where spin and parity information is partially known. This modeling can be benchmarked with gamma spectra from neutron time of flight experiments although data exists only for a limited number of isotopes. In the unresolved resonance and high energy regions, we are applying a modified version of DICEBOX (CASINO) which starts cascades from a range of capture states and accounts for gamma and neutron output channels. Additionally, we are using Hauser-Feshbach modeling developed at Lawrence Livermore National Laboratory to predict the cross sections of capture gamma spectra in regions where multiple competing output channels are open. This combination of experiment and modeling is being used to improve the neutron-capture data libraries used by the nuclear nonproliferation, engineering and science communities. This work is performed in part under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. DC 3 4:20 PM Fission Product Neutron Cross Section Library and its Reliability Assessment Jing Qian, Zhengjun Sun, Tinjin Liu China Nuclear Data Center, China Institute of Atomic Energy A complete library of neutron cross section data has been developed for fission product nuclides. It contains the data for 1121 fission product nuclides from 66 Ti to 172 Hf, atomic numbers 22 to 72, where involves a lot of very short-lived radioactive ones. The data were taken from better evaluated data libraries of ENDF/B-VII.0, EAF-2010 and TENDL-2010 or calculated by model theoretical computing code TALYS. The results for dominant major reaction channels up to 20 MeV were presented, which gives not only the cross section at mono-energies but also the Maxwell and fission spectrum average ones. Cross section reliability assessment has been done by comparing with experimental data and statistical analysis of cross 62
sections (SACS) based on the assumption that cross section excitation curves for all targets have a similar shape shifted by differences in Q-value, and that their properties, such as σmax, Emax and width at the half maximum ∆ 1/2, have a pronounced smooth trend as a function of A or the asymmetry s=(N-Z)/A. The reduced χ 2 were given by means of a comparison between some typical reaction excitation functions and available experimental data. The σmax(s) of all reactions were plotted and the confidence intervals were given not only for whole library but also for each of its components from different libraries or calculated with TALYS. In order to give the error factor of the library comprehensively, the reduced χ 2 were converted into the equivalent confidence interval to SACS. As a result, the error factors were given for all reactions in the libraries except for (n, γ) reaction at thermal energy. DC 4 4:40 PM The Covariance Evaluation for the 12 C- 208 Pb (n,tot) Cross Sections from the Microscopic Optical Model Ruirui Xu, Tinjin Liu, Yue Zhang, Zhigang Ge, Zhongyu Ma, Zhixiang Zhao China Institute of Atomic Energy It is known that the fundamental microscopic theory is more powerful in the predictions of nuclear data of unstable nuclei and the nuclei lack of measurements than the phenomenlogical model. The corresponding uncertainty evaluations are also important and valuable to the applications of these theoretical data. In this work, we propose to employ the deterministic least square approach (LS) to evaluate the covariance of the microscopic theoretical calculation, and the (n, tot) cross sections based on the microscopic optical model are taken as an example to illuminate it. A microscopic optical model potential (OMP) is successfully constructed based on the relativistic Dirac-Brueckner-Hartree-Fock (DBHF) theory in our previous study Ref.[1]. Here, this OMP is utilized to reproduce the (n,tot) cross sections of 12C-208Pb blow 200 MeV. All of the calculations are compared with experimental data and the calculations based on the empirical phenomenological potentials Ref.[2] and good agreement are achieved. Then, we respectively evaluate the sensitivities of theory and the covariance of experimental data (Vexp) for LS approach according to the characteristic of the present microscopic OMP. At first, in the sensitivity evaluation, the treatments in constructing the microscopic OMP are analyzed and the existing uncertain elements are parameterized. In the energy region 5-200 MeV, the sensitivities of this OMP to (n, tot) cross sections are systematically calculated for 12 C- 208 Pb, 77 nuclei in total. Additioanlly, instead of Vexp, we introduce the definition of ”equivalent covariance of experimental data” (EVexp) in the present study to describe the systematic deviation between experimental data and OMP results of 12 C- 208 Pb (77 nuclei also) as well as the errors of experimental data, and during this procedure, the statistic Gaussian function is adopted to estimate the systematic errors of EVexp. Finally, the derived 12 C- 208 Pb(n, tot) cross sections and relevant covariance (DCOV) are output by LS. The DCOV can be adopted as the covariance of the theoretical results when the LS output cross sections are very close to the theoretical calculations. Besides, a method named ”selection of effective points” is proposed to avoid the Peelle’s Pertinent Puzzle(PPP) problem in the present work, and a satisfactory result is obtained. In addition, the covariance of parameter(Vc) is obtained through global analysis for 12 C- 208 Pb(n,tot) cross sections, therefore, it is very helpful to generate the covariance of (n,tot) cross sections by this microscopic OMP for unstable nuclei. Meanwhile, it should be metioned that, up to now, LS is not utilized to evaluate theoretical (n,tot) cross sections in the energy below 5 MeV yet due to its basic assumption of linear function. [1] Ruirui Xu, and Zhongyu Ma, E. N. E. van Dalen and H. Müther, Phys. Rev.C 85, 034613 (2012); [2] A.J.Koning and J.P.Delaroche, Nucl. Phys. A 713, 231(2003). 63
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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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Page 23 and 24: 23 Thursday March 7, 2013 Time Met
Page 26 and 27: Book of Abstracts Session AA ND2013
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Page 34 and 35: [h] Table 1: Comparison of all the
Page 36 and 37: step was to determine which detecto
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Page 44 and 45: A revolutionary nuclear data system
Page 46 and 47: done in Ref. [1]. We demonstrate th
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Page 54 and 55: DA 3 4:20 PM Characterization and P
Page 56 and 57: detectors at the newly constructed
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Page 64 and 65: DC 5 5:00 PM Thermal Neutron Cross
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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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