Zn(He3,d)reactions at 18 MeV

Differential cross sections and spectroscopic strengths have been measured for the (${}_{}{}^3{}_{}{}^{}\mathrm{He},d$) reaction on targets of ${}_{}{}^{64,66,68,70}{}_{}{}^{}\mathrm{Zn}$ at a ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ energy of 18 MeV. For the three lighter isotopes general agreement is found with the results of the ($d,n$) experiment of Couch et al. Results for the reaction ${}_{}{}^{70}{}_{}{}^{}\mathrm{Zn}({}_{}{}^3{}_{}{}^{}\mathrm{He},d){}_{}{}^{71}{}_{}{}^{}\mathrm{Ga}$ suggest a significant break in the structure of the Ga isotopes at $N=40\mathrm{}$. It is suggested that this may be due to the $n-p$ interaction between nucleons in the same subshell.