EVALUATION OF NEUTRON CROSS SECTIONS FOR A COMPLETE SET OF Nd ISOTOPES.

KIM,H. ; HERMAN, M. ; MUGHABGHAB, S.F. ; OBLOZINSKY, P. ; ROCHMAN, D. ; LEE. Y.-O.

关键词: CROSS SECTIONS;    ENERGY RANGE;    EVALUATION;    FAST NEUTRONS;    NEUTRON TRANSPORT;    NEUTRONS;    NUCLEAR DATA COLLECTIONS;    NUCLEAR REACTIONS;    RESONANCE;   

DOI  :  10.2172/921937
RP-ID  :  BNL--79662-2007-IR
PID  :  OSTI ID: 921937
Others  :  R&D Project: 05055
Others  :  Other: KB0301041
Others  :  TRN: US0802165

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来源: SciTech Connect

【 摘 要 】

Neutron cross sections for a complete set of Nd isotopes, {sup 142,143,144,145,146,147,148,150}Nd, were evaluated in the incident energy range from 10{sup -5} eV to 20 MeV. In the low energy region, including thermal and resolved resonances, our evaluations are based on the latest data published in the Atlas of Neutron Resonances. In the unresolved resonance region we performed additional evaluation by using the averages of the resolved resonances and adjusting them to the experimental data. In the fast neutron region, we used the nuclear reaction model code EMPIRE-2.19 validated against the experimental data. The results are compared to the existing nuclear data libraries, including ENDF/B-VI.8, JENDL-3.3 and JEFF-3.1, and to the available experimental data. The new evaluations are suitable for neutron transport calculations and they were adopted by the new evaluated nuclear data file of the United States, ENDF/B-VII.0, released in December 2006.