Shape and structure for the low-lying states of the Ge80 nucleus

Abstract

The ground-state shape of the $^{80}\mathrm{Ge}$ nucleus and its evolution for the lowest collective excited states have been investigated in the framework of the Bohr model in order to clarify if the shape coexistence phenomenon is present. The obtained results, which are largely in agreement with the most recent experimental data, indicate a prolate shape for the ground state, respectively a sudden switch to a more deformed prolate one for certain excited states. Also, the first-excited ${0}_{2}^{+}$ state is found to be very high in energy, namely, at 2208 keV, being close to recent predictions made with shell-model calculations. Additionally, using the parameters fit for the few available experimental data for the ground band, the structure of the $\ensuremath{\beta}$ and $\ensuremath{\gamma}$ bands has been built to support future experiments.