Medium-spin states in Ge-70 and the role of the g(9/2) orbital

作者：Sugawara, M.^*; Toh, Y.; Oshima, M.; Koizumi, M.; Kimura, A.; Osa, A.; Hatsukawa, Y.; Kusakari, H.; Goto, J.; Honma, M.; Hasegawa, M.; Kaneko, K.

来源：Physical Review C, 2010, 81(2): 024309.

DOI：10.1103/PhysRevC.81.024309

• MULTIPLE COULOMB-EXCITATION
• EVEN GE
• SPECTROSCOPY
• COEXISTENCE

Medium-spin states of Ge-70 have been studied via the Ni-60(C-12,2p gamma)Ge-70 reaction at 45 MeV. The ground-state band and the second 0(+) band have been extended to the 12(+) and 8(+) states, respectively. Two negative-parity bands, one of which has a coupled structure and the other has a decoupled structure, have been observed additionally. Although the latter decoupled structure was known up to the (21(-)) state from a previous experiment, the part of the level scheme up to the 15(-) state has been largely modified by the present experiment. Backbendings observed in the positive- and negative-parity yrast bands have been compared with those of the neighboring even Ge isotopes. The experimental level structure has been compared with the shell-model calculations in the model space (2p(3/2), 1f(5/2), 2(p1/2), 1g(9/2)) employing two kinds of effective interactions, one of which is an extended P + QQ interaction with monopole interactions and the other is developed from a renormalized G matrix. Microscopic structures of the observed bands have been discussed with the help of the shell-model calculations.

• 出版日期2010-2
• 单位中国科学院近代物理研究所