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arXiv 1708.07282nucl-th
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对称性恢复态的手征几何:~(128)Cs的手征双重带

Chiral geometry in symmetry restored states: Chiral doublet bands in 128Cs

F. Q. Chen, Q. B. Chen, Y. A. Luo, J. Meng, S. Q. Zhang

摘要:

对加四极Hamilton量在对称性恢复的基础上对角化,即,具有角动量和粒子数投影的三轴准粒子态,并应用于128 Cs的手征双重带。在不引入任何参数的情况下,很好地再现了观测到的能谱和电磁跃迁几率。利用角动量分量在三个主轴上的分布以及角动量的倾角分布,研究了角动量在内禀坐标系中的取向。首次在角动量投影模型下证明了手征性随自旋的演化,并给出了手征性几何结构。

英文摘要:

The pairing-plus-quadrupole Hamiltonian is diagonalized in a symmetry restored basis, i.e., the triaxial quasiparticle-states with angular momentum and particle number projections, and applied for chiral doublet bands in 128Cs. The observed energy spectra and electromagnetic transition probabilities are reproduced well without introducing any parameter. The orientation of the angular momentum in the intrinsic frame is investigated by the distributions of its components on the three principle axes as well as those of its tilted angles. The evolution of the chirality with spin is illustrated and the chiral geometry is demonstrated in the angular momentum projected model for the first time.

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