Configuration-dependent bands in 169Re

Configuration-dependent bands in 169Re
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169Re 中与配置相关的频段

DOI:
10.1140/epja/i2003-10106-3
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发表时间:
2004
期刊:
Euro. Phys. J. A
影响因子:
--
通讯作者:
F.R. Xu
F.R. Xu
中科院分区:
其他
文献类型:
--
作者:
X.H. Zhou;M. Oshima;F.R. Xu

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对~(169)Re的高自旋态进行了研究,得到了一个基于9/2-[514]Nilsson态的强耦合带和一个建立在h9/2 1/2-[541]入侵者质子轨道上的解耦带。曲线壳模型的计算给出了与组态有关的形变,可以解释不同的带交叉频率。在已知的奇质量Re同位素中,~(169)Re的9/2-[514]带在低自旋时显示出最大的特征分裂。在一对I13/2中子对准后,分裂的相位被反转,幅度显著降低。对于轻的奇-A-Re同位素中的9/2-[514]带,结合核形状偏离轴对称性的情况,研究了Routhians的特征分裂及其与M_1跃迁矩阵元的特征依赖的关系,表明对于非常缺乏中子的奇-A-Re同位素,存在明显的负$-γ形变。此外,观察到并指定了一个可能建立在$\pi 9/2^{-}[514]\oTimes\Mbox{AE}$组态上的三准抛物线带。
Abstract.High-spin states in 169Re were studied and resulted in the identification of a strongly coupled band based on the 9/2-[514] Nilsson state and a decoupled band built on the h9/2 1/2-[541] intruder proton orbit. The cranked-shell-model calculations present configuration-dependent deformations that can explain the different band crossing frequencies. The 9/2-[514] band in 169Re shows the largest signature splitting at low spin among the known odd-mass Re isotopes. After the alignment of a pair of i13/2 neutrons, the phase of the splitting is inverted with a significantly reduced amplitude. For the 9/2-[514] bands in light odd-A Re isotopes, the signature splitting of the Routhians and its relation with the signature dependence of M1 transition matrix elements are investigated in connection with the deviation of nuclear shape from axial symmetry, suggesting an appreciable negative $ \gamma$ deformation for the very neutron-deficient odd-A Re isotopes. Additionally, a three-quasipariticle band was observed and assigned to be built likely on the $\pi 9/2^{-}[514] \otimes \mbox{AE}$ configuration.
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