Neutron Cross Section Covartances from Thermal Energy to 20 MeV.

Rochman, D. ; Mughabghab, S. F. ; Pigni, M. ; Kawand, T. ; Herman, M.

Technical Information Center Oak Ridge Tennessee

关键词: Neutrons;    Cross sections;    Fast neutrons;    Nuclear reactions;    Thermal neutrons;   

RP-ID  :  DE2008910374

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

We describe new method for energy-energy covariance calculation from the thermal energy up to 20 MeV. It is based on three powerful basic components: (1) Atlas of Neutron Resonances in the resonance region; (2) the nuclear reaction model code EMPIRE in the unresolved resonance and fast neutron regions, and (3) the Bayesian code KALMAN for correlations and error propagation. Examples for cross section uncertainties and correlations on (sup 90)Zr and (sup 193)Ir illustrate this approach in the resonance and fast neutron regions.