Band crossing and shape evolution in Ge-73

The spectroscopy of Ge-73 has been investigated via the Zn-70(Li-7,3np) Ge-73 fusion-evaporation reaction. A previously known band built on the nu(f(5/2)) orbital is extended up to higher-spin states and a new rotational band built on the nu(g(9/2)) orbital is established. The observed band crossing and shape evolution induced by the alignment in Ge-73 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 nu(f(5/2)) bands between Ge-73 and Se-75, Kr-77 can be ascribed to their different triaxial deformations. At higher spins, both the nu(f(5/2)) and nu(g(9/2)) bands in Ge-73 undergo a shape evolution with sizable alignments occurring. The characters of large signature splitting in nu(g(9/2)) band of Ge-73 are discussed.