Electromagnetic properties of Λ hypernuclei with a beyond relativistic mean-field approach

IF 1.7 4区 物理与天体物理 Q2 PHYSICS, NUCLEAR Nuclear Physics A Pub Date : 2023-11-10 DOI:10.1016/j.nuclphysa.2023.122794
Y.G. Yao , X.Y. Wu , H. Mei
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Abstract

We present a microscopic study of electromagnetic properties of the low-lying states of single-Λ hypernucleus Λ9Be using a quantum-number projected generator coordinate method (HyperGCM) based on covariant density functional theory. All the configurations are restricted to have axial symmetry, with the Λ hyperon in the lowest-energy state. The results are compared to the predictions of a simple particle-rotor model (PRM), for which analytic expressions are available. We show that the electromagnetic properties of Λ9Be from the HyperGCM calculation are close to those by the PRM. In particular, it is found that the magnetic moments and M1 transition strengths are less sensitive to the coupling strengths of the ΛN interaction than the electric quadrupole transition strengths. The latter may provide additional constraints on the ΛN interaction.

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超相对论平均场方法下Λ超核的电磁特性
本文利用基于协变密度泛函理论的量子数投影发生器坐标方法(HyperGCM)对单个-Λ超核Λ9Be低洼态的电磁特性进行了微观研究。所有的构型都被限制为轴对称,Λ超子处于最低能态。结果与简单颗粒-转子模型(PRM)的预测结果进行了比较,该模型具有解析表达式。我们证明了HyperGCM计算的Λ9Be的电磁特性与PRM计算的接近。特别是,发现磁矩和M1跃迁强度对ΛN相互作用的耦合强度的敏感性低于电四极子跃迁强度。后者可能会对ΛN交互提供额外的约束。
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来源期刊
Nuclear Physics A
Nuclear Physics A 物理-物理:核物理
CiteScore
3.60
自引率
7.10%
发文量
113
审稿时长
61 days
期刊介绍: Nuclear Physics A focuses on the domain of nuclear and hadronic physics and includes the following subsections: Nuclear Structure and Dynamics; Intermediate and High Energy Heavy Ion Physics; Hadronic Physics; Electromagnetic and Weak Interactions; Nuclear Astrophysics. The emphasis is on original research papers. A number of carefully selected and reviewed conference proceedings are published as an integral part of the journal.
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