Ni 同位核からのサブ・クーロン障壁陽子の放出

Abstract

A peak at low region of a proton spectrum in 14MeV-neutron-induced reactions is understood to be composed of sub-Coulomb-barrier protons. It is found by Grimes et al. in 14MeV-neutron experiments by an intense neutron source, Rotating Target Neutron Source-I. They predicted that the spectra calculated from the multi-step Hauser-Feshbach model agreed with the experimental ones. We have calculated in the same ways the proton spectra in the neutron-induced reactions for Ni isotopes near 10MeV. It has been concluded that the protons emitted by (n,np) reactions can be distinguished from the protons from the other reactions on the proton spectra if the incident neutron energies beyond about 3MeV from the threshold energy of the (n,np) reaction. The experiments are proposed and being made by Grimes expecting to check the reaction mechanism of emission of sub-Coulomb-barrier protons.