摘要:
鉴于临界点对称性方法在描述原子核形状相变中的成功应用,在强耦合方案下对原有描述偶偶核球形到长椭形状相变的临界点对称性模型
X(
n)(
n=3,4,5)进行扩展,据此建立描述轴对称奇
A核系统的
SX(
n)临界点对称性。通过对
X(
n)模型与
SX(
n)模型的转动谱结构进行对比分析,揭示了
SX(
n)临界点模型的动力学结构受模型维数
n的影响较小且更接近刚性转子的模型特征,这些模型特征进一步通过检验过渡区核素
150,151,152,153Sm以及
172,173,174,175Os中的相关转动带结构得到了初步证实。
In view of the successful application of the methods based on critical point symmetries (CPSs) in nuclear shape phase transitions, the new CPSs named
SX(
n) are established in this work for axially-symmetric odd-
A nuclei through extending the original
X(
n) CPSs with
n=3,4,5, which were used to describe the spherical to prolate shape phase transitions in even-even nuclei, in the strong-coupling scheme. By comparing the spectral structures in between the
X(
n) and the
SX(
n) CPSs, it is revealed that the dynamical structures of
SX(
n) are closer to the rigid rotor and less changed with the model dimension in comparison with
X(
n). Moreover, these features of
SX(
n) are preliminarily verified by checking the rotational structures of
150,151,152,153Sm and
172,173,174,175Os nuclei.