Abstract
Evidence of a spherical (or oblate) to prolate shape transition around $N=40$ in even-$A$ germanium nuclei has been obtained by measuring the static quadrupole moments of the first ${2}^{+}$ excited states of $^{70}\mathrm{Ge}$, $^{72}\mathrm{Ge}$, $^{74}\mathrm{Ge}$, and $^{76}\mathrm{Ge}$ using the reorientation effect in Coulomb excitation. The measurements yield ${Q}_{{2}^{+}}$ values of $(+0.03\ifmmode\pm\else\textpm\fi{}0.06) or (+0.09\ifmmode\pm\else\textpm\fi{}0.06)e$b for $^{70}\mathrm{Ge}$, $(\ensuremath{-}0.13\ifmmode\pm\else\textpm\fi{}0.06)e$b for $^{72}\mathrm{Ge}$, $(\ensuremath{-}0.25\ifmmode\pm\else\textpm\fi{}0.06)e$b for $^{74}\mathrm{Ge}$, and $(\ensuremath{-}0.19\ifmmode\pm\else\textpm\fi{}0.06)e$b for $^{76}\mathrm{Ge}$.NUCLEAR REACTIONS $^{70}\mathrm{Ge}$($^{6}\mathrm{Li}$, $^{6}\mathrm{Li}$\ensuremath{'}), $E=10.5$ MeV; $^{72,74,76}\mathrm{Ge}(\ensuremath{\alpha}, {\ensuremath{\alpha}}^{\ensuremath{'}})$, $E=7.0$ MeV; $^{70,72,74,76}\mathrm{Ge}$($^{16}\mathrm{O}$, $^{16}\mathrm{O}$\ensuremath{'}), $E=29.9$ MeV; measured $\ensuremath{\sigma}(E, {E}_{^{16}\mathrm{O}^{\ensuremath{'}}})$ deduced ${Q}_{{2}^{+}}$, $B(E2; {0}^{+}\ensuremath{\rightarrow}{2}^{+})$. Enriched targets.
Published Version
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