手征对称性和赝自旋对称性在一个核中的共存：$^{105}$ Ag中的三重态带
Coexistence of chiral symmetry and pseudospin symmetry in one nucleus: triplet bands in $^{105}$Ag
摘要：
利用相对论平均场（RMF）理论和多粒子加转子模型（MPRM）研究了$^{105}$ Ag中$πg_{9/2}^{-1}\otimes νh_{11/2} (g_{7/2},d_{5/2})$组态的近简并三重态带，发现这些带具有手征对称性和赝自旋对称性.构型固定约束的三轴RMF计算显示了单粒子谱的赝自旋对称性和三轴形状共存性。MPRM计算很好地再现了三重态带的实验激发能和电磁跃迁几率。手征二重带在$B(M1)/B(E2)$交错中显示相同的相位，而赝自旋二重带保持相反的相位。首次讨论了手征对称性与赝自旋对称性在同一核中共存的现象及其相应的转动结构特征。
英文摘要：
The nearly degenerate triplet bands with the $πg_{9/2}^{-1}\otimes νh_{11/2} (g_{7/2},d_{5/2})$ configuration in $^{105}$Ag are studied via the relativistic mean-field (RMF) theory and the multiparticle plus rotor model (MPRM), which indicates that these bands are associated with chiral symmetry and pseudospin symmetry. The configuration-fixed constrained triaxial RMF calculations exhibit the pseudospin symmetry in single particle spectra and the triaxial shape coexistence. The experimental excitation energies and the electromagnetic transition probabilities for the triplet bands are reproduced very well by the MPRM calculaitons. The chiral doublet bands show the same phase in the $B(M1)/B(E2)$ staggering, while the pseudospin doublet bands hold the opposite phase. The coexistence of chiral symmetry and pseudospin symmetry in one nucleus and its corresponding characteristic of the rotational structure are discussed for the first time.
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