An, R., Sun, S., Cao, L.-G., Zhang, F.-S. (2024). New quantification of symmetry energy from neutron skin thicknesses of 48Ca and 208Pb. arXiv preprint arXiv:2312.15434v2.
This research paper investigates the impact of nuclear matter incompressibility (K) on the determination of the slope parameter of nuclear symmetry energy (L) using neutron skin thickness (NST) measurements of $^{48}$Ca and $^{208}$Pb. The study aims to address the inconsistencies in L values derived from recent experimental data (CREX and PREX2) and highlight the importance of considering isoscalar properties in calibrating nuclear EDFs.
The authors employ a series of Skyrme-type energy density functionals (EDFs) classified by different incompressibility coefficients (K = 220 MeV, 230 MeV, and 240 MeV) to calculate the bulk properties of finite nuclei, including NST. They analyze the correlations between L and the NSTs of $^{48}$Ca and $^{208}$Pb for each K value and compare the results with experimental constraints.
The authors conclude that the incompressibility of symmetric nuclear matter plays a crucial role in accurately determining the slope parameter of nuclear symmetry energy, particularly for heavier nuclei like $^{208}$Pb. They emphasize the need to incorporate isoscalar properties like K in the calibration of nuclear EDFs to achieve a consistent description of the nuclear equation of state, especially for neutron-rich matter.
This research contributes to a deeper understanding of the nuclear symmetry energy and its density dependence, a crucial factor in understanding the properties of neutron stars and other astrophysical phenomena. The findings highlight the interconnectedness of isoscalar and isovector properties in nuclear matter and provide valuable insights for refining theoretical models and guiding future experimental investigations.
The study primarily focuses on Skyrme-type EDFs. Exploring the influence of K on L within the framework of relativistic EDFs could provide a more comprehensive understanding. Additionally, investigating the impact of other factors like the curvature of symmetry energy (Ksym) and three-body interactions on NST and L determination could further refine the analysis.
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by Rong An, Shu... klokken arxiv.org 10-11-2024
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