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Medium-spin states in 70Ge and the role of the g9/2 orbital

机译：70Ge中自旋态和g9 / 2轨道的作用

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摘要

Medium-spin states of 70Ge have been studied via the 60Ni(12C,2pγ)70Ge 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 (2p3/2, 1f5/2, 2p1/2, 1g9/2) 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.
机译：通过在45 MeV下的60Ni（12C，2pγ）70Ge反应研究了70Ge的自旋态。基态频带和第二个0+频带已分别扩展到12+和8+状态。此外，还观察到两个负奇偶校验带，其中一个具有耦合结构，另一个具有去耦合结构。尽管从先前的实验中直到（21-）状态为止都知道后者的解耦结构，但是通过本实验已经对高达15-状态的层级方案进行了部分修改。已将在正负奇偶校验yrast带中观察到的后弯曲与相邻偶数Ge同位素的后弯曲进行了比较。实验水平结构已与模型空间（2p3 / 2、1f5 / 2、2p1 / 2、1g9 / 2）中使用两种有效相互作用的壳模型计算进行了比较，其中一种是扩展的P + QQ相互作用与单极相互作用，另一个是从重新归一化的G矩阵发展而来的。借助于壳模型计算已经讨论了观察带的微观结构。

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  • 来源
    《Physical Review C: Nuclear Physics》 |2010年第2期|p.1-10|共10页
  • 作者

    M. Sugawara*; Y. Toh M. Oshima M. Koizumi A. Kimura A. Osa and Y. Hatsukawa; H. Kusakari; J. Goto; M. Honma; M. HasegawaK. Kaneko;

  • 作者单位

    Chiba Institute of Technology, Narashino, Chiba 275-0023, Japan;

    Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan;

    Chiba University, Inage-ku, Chiba 263-8522, Japan;

    Niigata University, Asahimachi-dori, Niigata 951-8510, Japan;

    Center for Mathematical Sciences, University of Aizu, Tsuruga, Ikki-machi, Aizu-Wakamatsu, Fukushima 965-8580, Japan;

    Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, People’s Republic of China;

    Department of Physics, Kyushu Sangyo University, Fukuoka 813-8503, Japan;

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