The interplay of single-particle and collective motions in the low-lying states of $$_\Lambda ^{21}$$ with quadrupole-octupole correlations
The interplay of single-particle and collective motions in the low-lying states of $$_\Lambda ^{21}$$ with quadrupole-octupole correlations
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DOI：
10.1007/s11433-022-2045-x
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发表时间：
2022-11
期刊：
影响因子：
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通讯作者：
HaoJie Xia;Xianye Wu;H. Mei;JiangMing Yao
中科院分区：
文献类型：
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作者：
HaoJie Xia;Xianye Wu;H. Mei;JiangMing Yao
基于协变密度泛函理论，将单粒子和四极-八极集体激发的组态混合在生成元坐标方法中，扩展了超低能超核态的超越平均场方法。在对以下低洼状态的应用中演示了该方法：\DocentClass[12pt]{Minimum}\usepackage{amsath}\usepackage{wa ysym}\usepackage{amsfonts}\usepackage{amsbsy}\usepackage{mathsfs}\usepackage{upgreek}\setlong{\oddsidemargin}{-69pt}\Begin{Document}$_\Lambda^{21}$$\end{Document}，其中考虑了Λ超子占据第一(ΛS)和第二(Λp)最低能态的组态。结果表明，正宇称态主要由α+12C+α+Λ结构主导。相反，由于包含了八极关联，低位负宇称态被α+16O+Λ结构和α+12C+α+Λ结构的强烈混合物所主导。其结果是，低位负宇称态的能级比没有混合时的预期要低得多，电性多极跃迁强度显著猝灭。
The beyond mean-field approach for low-lying hypernuclear states is extended by mixing the configurations associated with both single-particle and quadrupole-octupole collective excitations within the generator coordinate method based on a covariant density functional theory. The method is demonstrated in the application to the low-lying states of \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$_\Lambda ^{21}$$\end{document}, where the configurations with the Λ hyperon occupying the first (Λs) and second (Λp) lowest-energy states are considered. The results indicate that the positive-parity states are dominated by the α +12C + α + Λsstructure. In contrast, the low-lying negative-parity states are dominated by a strong admixture of α+16O + Λsstructure and α +12C + α + Λpstructure due to the inclusion of octupole correlations. As a result, the low-lying negative-parity states become much lower than what is expected from the previous studies without the mixing, and the electric multipole transition strengths are significantly quenched.