Band crossing and shape evolution inGe73

The spectroscopy of $^{73}\text{Ge}$ has been investigated via the $^{70}\text{Zn}(^{7}\text{Li},3np)^{73}\text{Ge}$ fusion-evaporation reaction. A previously known band built on the $\ensuremath{\nu}({f}_{5/2})$ orbital is extended up to higher-spin states and a new rotational band built on the $\ensuremath{\nu}({g}_{9/2})$ orbital is established. The observed band crossing and shape evolution induced by the alignment in $^{73}\text{Ge}$ are studied in comparison with the similar structures in the neighboring $N=41$ isotones and the cranked Woods--Saxon--Strutinsky calculations by means of total-Routhian-surface (TRS) methods. The inversion of the order of the ${g}_{9/2}$ neutron and the ${g}_{9/2}$ proton crossing frequency observed in the negative-parity $\ensuremath{\nu}({f}_{5/2})$ bands between $^{73}\text{Ge}$ and $^{75}\text{Se}$, $^{77}\text{Kr}$ can be ascribed to their different triaxial deformations. At higher spins, both the $\ensuremath{\nu}({f}_{5/2})$ and $\ensuremath{\nu}({g}_{9/2})$ bands in $^{73}\text{Ge}$ undergo a shape evolution with sizable alignments occurring. The characters of large signature splitting in $\ensuremath{\nu}({g}_{9/2})$ band of $^{73}\text{Ge}$ are discussed.