Measurements of Gamma-Ray Production Cross Sections of Nb and Cu for 15-MeV Neutrons

Gamma-ray production cross sections of Nb and Cu are measured for 14.9 -MeV neutrons. The accuracy of the experimental results is confirmed by comparing those with other experipental data obtained by similar energy neutrons. Hence, the data given in this paper are useful in the evaluation of secondary gamma-ray production data for fusion use. Based on the measured data, some comments are given to the evaluated data in the ENDF/B-Ⅳ file : (1) the gamma-ray spectrum of Cu data is not adequate, (2) the gamma-ray yield data of the file for Nb is overestimated