<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>β</mml:mi></mml:math> decay of the very neutron-deficient <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Ge</mml:mi><mml:mprescripts/><mml:none/><mml:mn>60</mml:mn></mml:mmultiscripts></mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Ge</mml:mi><mml:mprescripts/><mml:none/><mml:mn>62</mml:mn></mml:mmultiscripts></mml:math> nuclei
S. E. A. Orrigo, B. Rubio, W. Gelletly, P. Aguilera, A. Algora, A. I. Morales, J. Agramunt, D. S. Ahn, P. Ascher, Β. Blank, C. Borcea, A. Boso, R. B. Cakirli, J. Chiba, G. de Angelis, G. de France, F. Diel, P. Doornenbal, Y. Fujita, N. Fukuda, E. Ganioğlu, M. Gerbaux, J. Giovinazzo, S. Go, T. Goigoux, S. Grévy, V. Guadilla, N. Inabe, G. Kiss, T. Kubo, S. Kubono, T. Kurtukian‐Nieto, D. Lubos, C. Magron, F. Molina, A. Montaner-Pizá, D. R. Napoli, D. Nishimura, S. Nishimura, Hiroyuki Oikawa, V. H. Phong, H. Sakuraï, Y. Shimizu, C. Sidong, P.-A. Söderström, T. Sumikama, Hideyuki Suzuki, H. Takeda, Y. Takei, M. Tanaka, J. Wu, S. Yagi
Abstract
We report here the results of a study of the $\ensuremath{\beta}$ decay of the proton-rich Ge isotopes, $^{60}\mathrm{Ge}$ and $^{62}\mathrm{Ge}$, produced in an experiment at the RIKEN Nishina Center. We have improved our knowledge of the half-lives of $^{62}\mathrm{Ge}$ [73.5(1) ms] and $^{60}\mathrm{Ge}$ [25.0(3) ms] and its daughter nucleus, $^{60}\mathrm{Ga}$ [69.4(2) ms]. We measured individual $\ensuremath{\beta}$-delayed proton and $\ensuremath{\gamma}$ 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 $\ensuremath{\beta}$-delayed proton-emission branching ratio of 67(3)% has been obtained for $^{60}\mathrm{Ge}$. New information has been obtained on the energy levels populated in $^{60}\mathrm{Ga}$ and on the ${1/2}^{\ensuremath{-}}$ excited state in the $\ensuremath{\beta}p$ daughter $^{59}\mathrm{Zn}$. We extracted a ground state--to--ground state feeding of 85.3(3)% for the decay of $^{62}\mathrm{Ge}$. Eight new $\ensuremath{\gamma}$ lines have been added to the deexcitation of levels populated in the $^{62}\mathrm{Ga}$ daughter.