A fine study on gamma radiation in interaction of 14.9 MeV neutron with natural copper

The discrete gamma-ray spectra at 55 degree and 90 degree in the reactions of 14.9 MeV neutrons in natural copper are investigated by using total gamma radiation measurement technique (TGRM) in fast neutron nuclear reaction. There are 107 gamma-rays distinguished by means of a high-resolution gamma-ray analysis code. The production cross sections, the reaction modes and the transition levels of these gamma-rays at the two angles are determined. It is found that the gamma lines come mainly from the reactions of 63Cu(n, 2nγ)62Cu, 65Cu(n, 2nγ)64Cu, 63Cu(n, n'γ)63Cu, 65Cu(n, n'γ)65Cu, etc. Analysis of the activated background spectrum shows that natural copper is an ideal shielding material in fast neutron nuclear reactions