Shape coexistence and triaxiality in nuclei near 80Zr

Total-Routhian-Surface calculations have been performed to investigate the shape evolutions of $A\sim 80$ nuclei, ${}^{80-84}$Zr, ${}^{76-80}$Sr and ${}^{84,86}$Mo. Shape coexistences of spherical, prolate and oblate deformations have been found in these nuclei. Particularly for the nuclei, ${}^{80}$Sr and ${}^{82}$Zr, the energy differences between two shape-coexisting states are less than 220 keV. At high spins, the $g_{9\mathrm{/}2}$ shell plays an important role for shape evolutions. It has been found that the alignment of the $g_{9\mathrm{/}2}$ quasi-particles drives nuclei to be triaxial.