| 超越平均场模型对Ba同位素链八极形状演化研究 |
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| 引用本文： | 孙玮,全珊,向剑,李志攀. 超越平均场模型对Ba同位素链八极形状演化研究[J]. 原子核物理评论, 2019, 36(2): 144-150. DOI: 10.11804/NuclPhysRev.36.02.144 |
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| 作者姓名： | 孙玮 全珊 向剑 李志攀 |
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| 作者单位： | 1.西南大学物理科学与技术学院, 重庆 400715; |
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| 基金项目： | 国家自然科学基金资助项目（11475140，11875225，11765015）；贵州省教育厅青年科技人才成长项目（黔教合KY字[2016]312）；国家级大学生创新创业训练计划（201810635045） |
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| 摘 要： | 本文采用超越平均场模型研究了缺中子Ba同位素链114-124Ba的八极形变及其演化规律。计算了Ba链的位能曲面、低能激发谱、电四极跃迁几率、电八极跃迁几率及集体波函数的几率密度分布，并与实验相比较。理论计算较好地再现了Ba核的低能激发结构。位能曲面、低能的负宇称带、较大的B（E3；31- → 01+）和展宽的几率密度分布表明，114Ba中存在较强的八极关联。116，118Ba具有过渡核特征，而120-124Ba则为典型的四极形变原子核。
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| 关 键 词： | 超越平均场模型 八极形变 低能负宇称带 协变密度泛函理论 |
| 收稿时间： | 2018-09-17 |
Beyond-mean-field Study of Octupole Shape Evolution in Neutron-deficient Ba Isotopes |
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| SUN Wei,QUAN Shan,XIANG Jian,LI Zhipan. Beyond-mean-field Study of Octupole Shape Evolution in Neutron-deficient Ba Isotopes[J]. Nuclear Physics Review, 2019, 36(2): 144-150. DOI: 10.11804/NuclPhysRev.36.02.144 |
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| Authors: | SUN Wei QUAN Shan XIANG Jian LI Zhipan |
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| Affiliation: | 1.School of Physical Science and Technology, Southwest University, Chongqing 400715, China;2.School of Physics and Electronic, Qiannan Normal University for Nationalities, Duyun 558000, Guizhou, China |
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| Abstract: | The beyond-mean-field model is applied to study the octupole deformation and shape transition in 114-124Ba. Potential energy surfaces (PES), low-energy excitation spectra, electric transition rates, and probability density distributions in Ba isotopes are systematically analyzed using a quadrupole-octupole collective Hamiltonian (QOCH) model based on covariant density functional theory. The microscopic QOCH model is shown to accurately describe the empirical trend of low-energy positive-and negative-parity states. The theoretical results of PES, low-lying negative-parity bands, rather large B(E3;31- → 01+), and extended probability density distributions show evidence of strong octupole correlations in 114Ba. 116,118Ba present as transitional nuclei, while 120-124Ba are well quadrupole deformed nuclei. |
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