Beta decay of the very neutron-deficient \(^{60}\)Ge and \(^{62}\)Ge nuclei

We report here the results of a study of the \(\beta\) decay of the proton-rich Ge isotopes, \(^{60}\)Ge and \(^{62}\)Ge, produced in an experiment at the RIKEN Nishina Center. We have improved our knowledge of the half-lives of \(^{62}\)Ge (73.5(1) ms), \(^{60}\)Ge (25.0(3) ms) and its daughter nucleus, \(^{60}\)Ga (69.4(2) ms). We measured individual \(\beta\)-delayed proton and \(\gamma\) emissions and their related branching ratios. Decay schemes and absolute Fermi and Gamow-Teller transition strengths have been determined. The mass excesses of the nuclei under study have been deduced. A total \(\beta\)-delayed proton-emission branching ratio of 67(3)% has been obtained for \(^{60}\)Ge. New information has been obtained on the energy levels populated in \(^{60}\)Ga and on the 1/2\(^-\) excited state in the \(\beta p\) daughter \(^{59}\)Zn. We extracted a ground state to ground state feeding of 85.3(3)% for the decay of \(^{62}\)Ge. Eight new \(\gamma\) lines have been added to the de-excitation of levels populated in the \(^{62}\)Ga daughter.