Structure of the very neutron-deficient Ge region:Ge64andGe65

The structure of the very neutron-deficient Ge region has been investigated with use of particle-γ coincidence techniques in weak fusion-evaporation channels. Excited states up to spin (31/2) have been established in ${}_{}{}^{65}{}_{}{}^{}\mathrm{Ge}$, and five transitions have been assigned to the N=Z nucleus ${}_{}{}^{64}{}_{}{}^{}\mathrm{Ge}$. The first excited state in ${}_{}{}^{64}{}_{}{}^{}\mathrm{Ge}$ is at 902.1±0.8 keV. The ${}_{}{}^{65}{}_{}{}^{}\mathrm{Ge}$ level scheme provides the first indication in this mass region of a theoretically predicted softness with respect to octupole deformation.