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arXiv 2602.22722nucl-th
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CREX和PREX-II在能量密度泛函理论中得到调和

CREX and PREX-II reconciled within energy-density functional theory

Institute for Rare Isotope Science, Institute for Basic Science(稀有同位素科学研究所,基础科学研究所)

P. Papakonstantinou

AI总结:

本文通过调整能量密度泛函理论中的约束,使CREX和PREX-II实验数据得以调和,同时保持中子星质量和半径关系的准确性。

摘要:

CREX和PREX-II对钙-48和铅-208中中子皮肤厚度的测量挑战了标准核能量密度泛函(EDF)对核和核物质的描述。我们表明,这种看似矛盾源于EDF理论中的一个隐含约束,该约束将功能在稀疏核表面的密度依赖性与接近饱和的均匀物质的密度依赖性联系起来。放松这种表面-体耦合并独立约束稀疏密度区域,同时保持现实的饱和和高密度行为,得到的EDF能够同时重现两种核的中子皮肤、它们的电偶极极化率以及中子星质量-半径关系。已建立的中子皮肤厚度与对称能斜率参数L在饱和处的相关性得以保留,但变得显著更宽。结果表明,当前中子皮肤数据不需要极端的L值,并突显了与低密度核物质相关的未约束自由度。

英文摘要:

The CREX and PREX-II measurements of the neutron-skin thickness of 48Ca and 208Pb challenge standard nuclear energy-density functional (EDF) descriptions of nuclei and nuclear matter. We show that the apparent tension arises from an implicit constraint in EDF theory, which ties the density dependence of the functional at the dilute nuclear surface to that of uniform matter near saturation. Relaxing this surface-bulk coupling and independently constraining the dilute-density sector, while preserving realistic saturation and high-density behavior, yields EDFs that simultaneously reproduce the neutron skins of both nuclei, their electric dipole polarizabilities, and neutron-star mass-radius relations. The established correlation between the neutron-skin thickness and the symmetry-energy slope parameter L at saturation is retained but becomes substantially broader. The results show that current neutron-skin data do not require extreme values of L and highlight an underconstrained degree of freedom associated with low-density nuclear matter.

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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