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arXiv 2101.08528nucl-th
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丰中子Sn同位素的电偶极极化率作为核等矢量性质的探针

Electric dipole polarizability in neutron-rich Sn isotopes as a probe of nuclear isovector properties

Zhengzheng Li, Yifei Niu, Wenhui Long

摘要:

核对称能的确定,特别是它的密度依赖性,是核物理界长期面临的难题。以往的研究发现,电偶极极化率$α_D$与饱和密度下对称能的乘积$J$与对称能的斜率参数$L$具有很强的线性相关性。然而,当前$J$的不确定性阻碍了对$L$的精确约束。采用基于Skyrme Hartree-Fock-Bogoliubov的准粒子无规相位近似,研究了Sn同位素电偶极极化率$α_D$(或饱和密度下的时间对称能$J$)与对称能斜率参数$L$之间的相关性.在富中子Sn同位素中发现了$α_D$和$L$之间强的、与模型无关的线性相关,其中,由于配对相关通过PDR起着重要作用,因此,侏儒偶极共振(PDR)对$α_D$有相当大的贡献.如果在丰中子核中以高分辨率测量$α_D$,这种新发现的线性关系将有助于严格地限制$L$和中子皮厚度$ΔR_\textnormal{np}$。此外,在$β$ -稳定线附近的核中的$α_D J$与丰中子核中的$α_D$之间的线性相关性可用于评估丰中子核中的$α_D$。

英文摘要:

The determination of nuclear symmetry energy, and in particular, its density dependence, is a long-standing problem for nuclear physics community. Previous studies have found that the product of electric dipole polarizability $α_D$ and symmetry energy at saturation density $J$ has a strong linear correlation with $L$, the slope parameter of symmetry energy. However, current uncertainty of $J$ hinders the precise constraint on $L$. We investigate the correlations between electric dipole polarizability $α_D$ (or times symmetry energy at saturation density $J$) in Sn isotopes and the slope parameter of symmetry energy $L$ using the quasiparticle random-phase approximation based on Skyrme Hartree-Fock-Bogoliubov. A strong and model-independent linear correlation between $α_D$ and $L$ is found in neutron-rich Sn isotopes where pygmy dipole resonance (PDR) gives a considerable contribution to $α_D$, attributed to the pairing correlations playing important roles through PDR. This newly discovered linear correlation would help one to constrain $L$ and neutron-skin thickness $ΔR_\textnormal{np}$ stiffly if $α_D$ is measured with high resolution in neutron-rich nuclei. Besides, a linear correlation between $α_D J$ in a nucleus around $β$-stability line and $α_D$ in a neutron-rich nucleus can be used to assess $α_D$ in neutron-rich nuclei.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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