Spectroscopy ofZn68,Zn70, andGe74via the (d,He3) reaction

The ${}_{}{}^{69,71}{}_{}{}^{}\mathrm{Ga}(d,{}_{}{}^3{}_{}{}^{}\mathrm{He}){}_{}{}^{68,70}{}_{}{}^{}\mathrm{Zn}$ and ${}_{}{}^{75}{}_{}{}^{}\mathrm{As}(d,{}_{}{}^3{}_{}{}^{}\mathrm{He}){}_{}{}^{74}{}_{}{}^{}\mathrm{Ge}$ reactions have been studied at 26 MeV with an overall resolution of 18-20 keV using a split pole magnetic spectrometer. Spectroscopic factors have been extracted for 16 levels in ${}_{}{}^{68}{}_{}{}^{}\mathrm{Zn}$, 14 levels in ${}_{}{}^{70}{}_{}{}^{}\mathrm{Zn}$, and 24 levels in ${}_{}{}^{74}{}_{}{}^{}\mathrm{Ge}$. The ratio $R=\frac{\sigma \left(0_2^{+}\right)}{\sigma \left(0_{\mathrm{g}.\mathrm{s}.\mathrm{}}^{+}\right)}$ shows a singularity at $N=40\mathrm{}$. The small value of $R$ for ${}_{}{}^{74}{}_{}{}^{}\mathrm{Ge}$ is consistent with a previously proposed description of the structure of the states involved which is based on a simple mixing of $p_{\frac{3}{2}}$ and $f_{\frac{5}{2}}$ proton configurations. The results for the $\mathrm{Ga}(d,{}_{}{}^3{}_{}{}^{}\mathrm{He})\mathrm{Zn}$ reactions are compared with a recent shell-model calculation.