Abstract
A systematic study of all of the stable even germanium isotopes by the ($t$,$p$) reaction has been performed. The reaction protons were analyzed in a quadrupole-dipole-dipole-dipole spectrometer with a resulting energy resolution approximately 15 keV. Levels up to 3 MeV in excitation energy were measured and the angular distributions compared to distorted wave analysis. A number of new spin assignments are made in the heavier germanium nuclei. Examination of the systematic trend of the ground state as well as various excited levels strongly supports a transition in nuclear deformation between $N=40$ and $N=42$. The data also indicate the effects of the approaching shell closure at $N=50$.NUCLEAR REACTIONS $^{70,72,74}\mathrm{Ge}$($t$,$p$), ${E}_{t}=17$ MeV $\ensuremath{\sigma}(\ensuremath{\theta})$, DW analysis.
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