论文标题
奇数$^{194-200} $ tl同位素
High-Spin Doublet Band Structures in odd-odd $^{194-200}$Tl isotopes
论文作者
论文摘要
三轴投影壳模型（TPSM）方法中的基本空间被推广到奇数核中，以在基本的单中子耦合到一proton quasiparticle状态的基本单中子上包含两种中子和两种蛋白构型。该概括允许研究奇数核超越频带越过区域，并且作为该发展的第一个应用，最近研究了在奇数$^{194-200} $ tl同位素中观察到的高自旋带结构。在其中一些同位素中，在跨界交叉后观察到的双重条带结构是由手性对称性的自发断裂引起的。在这些奇数同位素中，手性对称性的驱动构型是单蛋白和三中性基质，而不是基本的单蛋白和一单位中子，正如在许多其他核中已经观察到的那样。使用TPSM方法证明了Doublet乐队在$^{194} $ tl和$^{198} $ tl中的能量差异确实很小。但是，计算出的过渡概率的差异要比手性对称限制中的预期大一些。需要有关过渡概率的实验数据，以阐明双重乐队的手性质。
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.
