Theoretical analysis of -ray strength function for Pd isotopes

Iwamoto, Nobuyuki  ; Terada, Kazushi*

Gamma-ray Strength Function (GSF) is one of the important components to understand capture reaction process by fast neutrons. The GSF is directly determined by measured data of photonuclear reaction. However, information of the GSF below neutron Binding Energy (BE) is not obtained from those data. In order to fix the GSF below the BE, it is effective to use measured spectrum of -rays emitted by neutron capture reaction. In this work GSF was evaluated by using -ray spectra and cross sections of neutron capture reactions for stable Pd isotopes and cross sections of photonuclear reaction for natural Pd. Theoretical analysis was performed by nuclear reaction calculation code CCONE. As a result, we derived GSF which reproduced the both data simultaneously. The cross section and -ray spectrum for Pd calculated on the basis of the GSF show a good agreement with the recently measured data. The cross section decreases from that of JENDL-4.0 by 8% in the keV energy region.