IMPROVEMENT OF GAMMA-RAY PRODUCTION DATA FOR JENDL-3.2

Gamma-ray production cross sections and spectra have been updated for the latest version of JENDL-3 (JENDL-3.2). Problems of gamma-ray produ ction data contained in the previous version JENDL-3.1 were examined, and they have been mostly resolved in the present work. In the medium- heavy mass region, capture gamma-ray spectra for incident neutron ener gies below 10 keV were re-calculated with the statistical model taking account of experimentally determined branching ratios for primary tra nsitions. For natural elements, line gamma rays due to inelastic scatt ering were explicitly given in JENDL-3.2 up to several MeV. Capture cr oss sections of some light nuclides were evaluated by considering a p- wave capture behavior indicated by recent measurements. Gamma-ray prod uction data for 66 nuclides have been compiled into JENDL-3.2 in the E NDF-6 format.