相对论平均场模型的张量和等矢量等标量项:对中子蒙皮厚度、电荷半径和核物质的影响

IF 1.7 4区 物理与天体物理 Q2 PHYSICS, NUCLEAR
N. Liliani , A.M. Nugraha , J.P. Diningrum , A. Sulaksono
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引用次数: 0

摘要

由CREX和PREX合作测量的中子表皮厚度的起源仍然是一个谜,40Ca薄,28Pb厚。研究了相对论平均场模型(RMF)中张量项和非线性等矢量等标量项对有限核和核物质性质的影响。张量耦合对于有限核的高质量结合能和相对重核的电荷半径是至关重要的。然而,对于轻核,张量项不能提高RMF模型预测的电荷半径与实验数据的相容性。我们发现具有较大非线性等矢量-等标量参数的参数集,特别是η2ρ = 0.028,在轻、中、重同位素链上与Δrnp的实验数据吻合得更好。利用PT28,我们计算出208Pb的Δrnp为0.214 fm, J为33.078,L为58.426。PT28得到的208Pb的Δrnp与PREX-II数据一致。J和L对应的值符合低L约束。同时,PT28预测的标准质量半径与NICER合作项目的质量和半径数据一致。RMF模型中张量和非线性等矢量-等标量耦合的结合提供了对有限原子核结合能和较重原子核电荷半径的准确预测,导致208Pb的Δrnp值相对较厚,L值不明显。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Tensor and isovector–isoscalar terms of relativistic mean field model: Impacts on neutron-skin thickness, charge radius, and nuclear matter

The origin of the neutron skin thickness, measured by the CREX and PREX collaborations as thin for 40Ca and thick for 28Pb, remains a mystery. We investigate the effects of tensor and nonlinear isovector–isoscalar terms in a relativistic mean-field model (RMF) on the properties of finite nuclei and nuclear matter. Tensor couplings are crucial for better quality binding energies of finite nuclei and charge radii for relatively heavy nuclei. However, for light nuclei, the tensor terms cannot improve the compatibility of charge radius predictions by the RMF model with experimental data. We find that parameter sets with a larger nonlinear isovector–isoscalar parameter, particularly η2ρ = 0.028, agree better with experimental data for Δrnp across light, medium, and heavy isotope chains. Using PT28, we calculate Δrnp for 208Pb as 0.214 fm, J as 33.078, and L as 58.426. Δrnp for 208Pb obtained using PT28 is consistent with the PREX-II data. Moreover, the corresponding values of J and L agree with the low L constraints. Meanwhile, the canonical mass radius predicted by PT28 aligns with the mass and radius data from the NICER collaboration. The combination of tensor and nonlinear isovector–isoscalar couplings in the RMF model provides accurate predictions for finite nuclei binding energies and relatively heavy nuclei charge radii, resulting in relatively thick Δrnp values for 208Pb without substantial L values.

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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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