Anatomy of octupole correlations in 96Zr with a symmetry-restored multidimensionally-constrained covariant density functional theory
Anatomy of octupole correlations in 96Zr with a symmetry-restored multidimensionally-constrained covariant density functional theory
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DOI：
10.1016/j.physletb.2023.137896
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发表时间：
2022-01
影响因子：
4.4
通讯作者：
Yu-Ting Rong;X. Wu;B. Lu;Jiangming Yao
中科院分区：
文献类型：
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作者：
Yu-Ting Rong;X. Wu;B. Lu;Jiangming Yao
最近一项基于相对论重离子碰撞实验STAR测量的分析提供了96zr基态八极相关的证据，这对核结构模型提出了挑战。在这项工作中，我们基于一个多维约束的相对论Hartree-Bogoliubov模型对96zr进行了变化后的投影计算。我们的结果表明，对称恢复后的八极子形状在能量上更有利，这种现象在纯平均场计算中无法再现。这些复杂的结构起源于该质量区域内各种壳结构之间的竞争。我们的研究结果表明，在密度泛函理论中，允许平均场水平的对称性破缺和恢复对称性破缺是理解96zr结构的基本要素。
A recent analysis based on the STAR measurement in relativistic heavy-ion collision experiments provides evidence of octupole correlation in the ground state of96Zr, the description of which presents a challenge to nuclear structure models. In this work, we perform projection-after-variation calculations for96Zr based on a multidimensionally-constrained relativistic Hartree-Bogoliubov model. Our results show that an octupole deformed shape is favored in energy after symmetry restoration, and this phenomenon cannot be reproduced in the pure mean-field calculations. These complex structures originate from the competition among various shell structures in this mass region. Our results suggest that the allowance of symmetry breaking at the mean-field level and the restoration of broken symmetries are essential elements for understanding the structure of96Zr in density functional theories.