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arXiv 2007.12347nucl-thnucl-ex
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$^{194-200}$ T1同位素的高自旋双态能带结构

High-Spin Doublet Band Structures in odd-odd $^{194-200}$Tl isotopes

S. Jehangir, I. Maqbool, G. H. Bhat, J. A. Sheikh, R. Palit, N. Rather

备注：
11 pages, 17 figures, to appear in EPJA
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摘要：

本文将三轴投影壳模型（TPSM）方法中的基空间推广到奇-奇核，使之在单中子-单质子准粒子耦合的基础上包含两中子和两质子组态。概括允许调查的奇-奇核带交叉区域以外，作为第一个应用程序的发展，高自旋能带结构最近观察到的奇-奇$^{194-200}$ Tl同位素进行了研究。在某些同位素中，在能带交叉后观察到的双重能带结构已被证实是由手征对称性的自发破缺引起的。在这些奇-奇同位素中，手征对称性的驱动组态是一个质子和三个中子，而不是在许多其他原子核中已经观察到的基本的一个质子和一个中子。使用TPSM方法证明了$^{194}$ T1和$^{198}$ T1中的双重带的能量差确实很小。然而，在计算的跃迁几率的差异是有点大于预期的手征对称性限制。需要关于跃迁几率的实验数据来阐明二重带的手性性质。

英文摘要：

The basis space in the triaxial projected shell model (TPSM) approach is generalized for odd-odd nuclei to include two-neutron and two-proton configurations on the basic one-neutron coupled to one-proton quasiparticle state. The generalization allows to investigate odd-odd nuclei beyond the band crossing region and as a first application of this development, high-spin band structures recently observed in odd-odd $^{194-200}$Tl isotopes are investigated. In some of these isotopes, the doublet band structures observed after the band crossing have been conjectured to arise from the spontaneous breaking of the chiral symmetry. The driving configuration of the chiral symmetry in these odd-odd isotopes is one-proton and three-neutrons rather than the basic one-proton and one-neutron as already observed in many other nuclei. It is demonstrated using the TPSM approach that energy differences of the doublet bands in $^{194}$Tl and $^{198}$Tl are, indeed, small. However, the differences in the calculated transition probabilities are somewhat larger than what is expected in the chiral symmetry limit. Experimental data on the transition probabilities is needed to shed light on the chiral nature of the doublet bands.

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