偶偶$^{168-178}$Yb核低激发能级与电磁性质的微观研究
Microscopic study of low-lying energy levels and electromagnetic properties in even-even $^{168-178}$Yb nuclei
- Facultad de Física, Universidad Veracruzana（韦拉克鲁斯大学物理学院）
- Facultad de Ciencias, Universidad Nacional Autónoma de México（墨西哥国立自治大学理学院）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本文首次利用pseudo-SU(3)壳层模型研究$^{168-178}$Yb同位素的低激发能谱与电磁性质，通过包含对称性保持与破缺项的哈密顿量及转子项精细调整，成功描述了能谱、B(E2)跃迁、g因子和电四极矩，但模型在异常宇称部分存在局限。
AI中文摘要：
采用基于对称性的方法对稀土核进行理论描述具有诸多优势。其中，pseudo-SU(3)壳层模型已被证明是描述这些系统特征和理解各种性质的一种非常有效的方法。本文首次利用该模型对$^{168-178}$Yb同位素的低激发能谱和电磁性质进行了理论描述，并在可能的情况下将理论结果与实验值进行了比较。哈密顿量包含保持对称性的$Q \cdot Q$项，以及破坏对称性的Nilsson项和对关联项。此外，还加入了三个转子型项，以便对能谱进行精细调整。结果表明，该模型能够充分描述能谱、B(E2)跃迁、g因子和电四极矩。尽管该模型在描述重形变核正常宇称低激发性质方面是一个强有力的工具，但其最大的局限性在于异常宇称部分，该部分未被纳入描述。
英文摘要：
Employing methods based on symmetries for the theoretical description of rare-earth nuclei offers many advantages. Among these, the pseudo-SU(3) shell model has proved to be a very useful method to describe characteristics of these systems and to understand various properties. A theoretical description of the low-lying energy spectrum and electromagnetic properties of isotopes $^{168-178}$Yb is carried out for the first time with this model, comparing theoretical results with the experimental values, where possible. The Hamiltonian includes the $Q \cdot Q$ term which preserves the symmetry, as well as the breaking symmetry of Nilsson and pairing terms. Additionally, three rotor type terms are included that allow us to make a subtle adjustment of the spectrum. The results show that the energy spectrum, the B(E2) transitions, the g-factors and the electric quadrupole moments can be described adequately with the model. Although the model is a powerful tool in the description of low-lying properties of normal parity in heavy deformed nuclei, it finds its strongest limitation in the abnormal parity sector, which has been left out of the description.
