Gamma Rays from Inelastic Scattering of Neutrons by Fe, Cu, Zn, Ge and Se

抄録

Gamma rays following inelastic scattering of neutrons by Fe, Cu, Zn, Ge and Se, have been measured with 3.11∼4.72 MeV neutrons using a ring geometry arrangement. The excitation functions for the following gamma rays were observed: 0.844, 1.23^*, 1.80^*, 2.11^* and 2.56^* MeV in Fe⁵⁶, 0.665, 0.965 and 1.33 MeV in Cu⁶³, 0.760 and 1.11 MeV in Cu⁶⁵, 0.810^*, 0.995 and 1.81 MeV in Zn^64,66,68, 0.590 MeV in Ge^74,76, 0.830 MeV in Ge⁷², 1.01 MeV in Ge⁷⁶, 0.560 MeV in Se⁷⁶, and 0.660 MeV in Se^76,78,80, respectively. The asterisk indicates the transitions from the higher excited to the 1st excited states. An aspect of de-excitation of higher energy levels was also discussed by analyzing the ratio of probabilities of de-excitation through or not through the 1st excited state as a function of the incident neutron energy.