Evaluation of neutron nuclear data on copper isotopes in fast energy region

Nakayama, Shinsuke  

Toward development of an activation cross section file, we evaluated neutron cross sections on copper isotopes in the incident energy range from 50 keV to 20 MeV. Although copper is important material, the evaluated values of activation cross sections on copper isotopes have not been updated for about thirty years, and some large discrepancies can be seen between the evaluated values and the recently measured ones. In the present study, therefore, we aimed to improve accuracy of activation cross sections. We used the CCONE code for nuclear reaction calculation. Direct component was calculated by the dispersive coupled-channel optical model and the distorted wave Born approximation. Pre-equilibrium and compound components were calculated by the two component exciton model and the Hauser-Feshbach model, respectively. The present evaluation results reproduced the existing measured data better than the evaluated data of JENDL-4.0.