Neutron Resonance Parameters and Covariance Matrix of 239Pu

Derrien, Herve ; Leal, Luiz C ; Larson, Nancy M

Oak Ridge National Laboratory

关键词: Fission;    Energy Range;    Processing;    Neutrons;    Cross Sections;   

DOI  :  10.2172/969958
RP-ID  :  ORNL/TM-2008/123
RP-ID  :  DE-AC05-00OR22725
RP-ID  :  969958

美国|英语

来源: UNT Digital Library

【 摘 要 】

In order to obtain the resonance parameters in a single energy range and the corresponding covariance matrix, a reevaluation of 239Pu was performed with the code SAMMY. The most recent experimental data were analyzed or reanalyzed in the energy range thermal to 2.5 keV. The normalization of the fission cross section data was reconsidered by taking into account the most recent measurements of Weston et al. and Wagemans et al. A full resonance parameter covariance matrix was generated. The method used to obtain realistic uncertainties on the average cross section calculated by SAMMY or other processing codes was examined.