Study of theCu65(p, n)Zn65*Reaction by Conversion Electrons

Abstract

A magnetic beta-ray spectrometer has been used to study the prompt internal-conversion electrons from low-lying states of ${\mathrm{Zn}}^{65}$ excited by the ${\mathrm{Cu}}^{65}(p, n){\mathrm{Zn}}^{65*}$ reaction. The data show that there are levels in ${\mathrm{Zn}}^{65}$ at 54±2, 119±2, and 209±3 kev, all levels being excited directly by the $p-n$ reaction. The threshold for exciting the 54-kev level is (${2223}_{-3\mathrm{}}^{+2\mathrm{}}$) kev, yielding a $Q$ value of -(${2189}_{-3\mathrm{}}^{+2\mathrm{}}$) kev for the reaction to this level. Neutron branching ratios were calculated from the relative yields of conversion electrons. At a bombarding energy of 3.75 Mev the ratios are 1:8:4 for the neutrons leading to the 54-, 119-, and 209-kev levels, respectively.