Ge70,72,74,76(d, He3)Ga69,71,73,75reactions at 26 MeV

The ${}_{}{}^{70,72,74,76}{}_{}{}^{}\mathrm{Ge}(d, {}_{}{}^3{}_{}{}^{}\mathrm{He}){}_{}{}^{69,71,73,75}{}_{}{}^{}\mathrm{Ga}$ reactions have been studied at 26 MeV with 15-keV resolution full width at half maximum using a tandem accelerator and split pole magnetic spectrometer. The spectroscopic factors are determined for 15 levels in ${}_{}{}^{69}{}_{}{}^{}\mathrm{Ga}$ and 11 levels in each of the 3 other Ga isotopes. Level schemes are proposed for the practically unknown ${}_{}{}^{73}{}_{}{}^{}\mathrm{Ga}$ and ${}_{}{}^{75}{}_{}{}^{}\mathrm{Ga}$. Anomalies in the occupation numbers are observed between $Z=31\mathrm{} \mathrm{and} 32$ and between $N=40\mathrm{} \mathrm{and} 42$, this last one corresponding to the structural transition observed recently in a comparison of the ($p, t$) and ($t, p$) reactions. These anomalies could be related to changes in the nuclear shape.