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arXiv 2108.06501nucl-th
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用粒子数守恒方法系统研究奇-奇核$^{166, 168, 170, 172}$ Re的高自旋结构

Systematic investigation of the high-spin structures in the odd-odd nuclei $^{166, 168, 170, 172}$Re by a particle-number conserving method

Zhen-Hua Zhang, Shuo-Yi Liu

摘要:

本文采用推转壳模型,用粒子数守恒方法处理对关联,研究了最近在奇-奇核$^{166, 168, 170, 172}$ Re中观测到的两个和四个准粒子高自旋转动带.如果为这些带分配适当的带头自旋和构型,则可以通过本计算很好地再现实验惯性矩和对准,这反过来又证实了它们的自旋和构型分配。发现在$^{166}$中观察到的这两个转动带的带头自旋Re~[Li {\it et al.},Phys. Rev. C 92 014310(2015)]都应该增加$2\hbar$,以与$^{168, 170, 172}$ Re中相同配置的实验和计算惯性矩的系统学一致。研究了这些核的背弯/上弯随中子数的变化。通过分析费米面附近的单粒子态的占据几率的变化及其对角动量随转动频率的变化规律的贡献,可以很好地理解能级交叉机制。此外,还讨论了质子$1/2^-[541]$($h_{9/2}$)轨道的形变驱动效应对$^{172}$ Re能级交叉的影响.

英文摘要:

The recently observed two and four-quasiparticle high-spin rotational bands in the odd-odd nuclei $^{166, 168, 170, 172}$Re are investigated using the cranked shell model with pairing correlations treated by a particle-number conserving method. The experimental moments of inertia and alignments can be reproduced well by the present calculation if appropriate bandhead spins and configurations are assigned for these bands, which in turn confirms their spin and configuration assignments. It is found that the bandhead spins of those two rotational bands observed in $^{166}$Re~[Li {\it et al.}, Phys. Rev. C 92 014310 (2015)] should be both increased by $2\hbar$ to get in consistent with the systematics of the experimental and calculated moments of inertia for the same configurations in $^{168, 170, 172}$Re. The variations of the backbendings/upbendings with increasing neutron number in these nuclei are investigated. The level crossing mechanism is well understood by analysing the variations of the occupation probabilities of the single-particle states close to the Fermi surface and their contributions to the angular momentum alignment with rotational frequency. In addition, the influence of the deformation driving effects of the proton $1/2^-[541]$ ($h_{9/2}$) orbtial on the level crossing in $^{172}$Re is also discussed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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