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arXiv 1003.3295nucl-th
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扩展相对论平均场模型中的非对称核物质和中子皮

Asymmetric nuclear matter and neutron-skin in extended relativistic mean field model

B. K. Agrawal

摘要:

在扩展的相对论平均场(ERMF)模型中,研究了对称性能量的密度依赖性,这有助于理解非对称核物质的行为,该模型包括了四阶标量-等差介子($σ$)、矢量-等差介子($ω$)和矢量-等矢量介子($ρ$)的自相互作用项和混合相互作用项的贡献.所采用的26种不同的ERMF模型参数化中的每一种都与有限核的体性质相容。几个参数集的对称性能量的行为被发现是一致的经验约束,从分析的同位旋扩散数据。对于ERMF模型的这些参数集,$^{208}$ Pb核中的中子皮厚度在$\sim 0.20 - 0.24$ fm范围内,这与Skyrme Hartree-Fock模型的预测值一致。我们还研究了各种混合相互作用项的作用,这是至关重要的对称性能量的密度依赖性。

英文摘要:

The density dependence of the symmetry energy, instrumental in understanding the behaviour of the asymmetric nuclear matter, is investigated within the extended relativistic mean field (ERMF) model which includes the contributions from the self and mixed interaction terms for the scalar-isoscalar ($σ$), vector-isoscalar ($ω$) and vector-isovector ($ρ$) mesons upto the quartic order. Each of the 26 different parameterizations of the ERMF model employed are compatible with the bulk properties of the finite nuclei. The behaviour of the symmetry energy for several parameter sets are found to be consistent with the empirical constraints on them as extracted from the analyses of the isospin diffusion data. The neutron-skin thickness in the $^{208}$Pb nucleus for these parameter sets of the ERMF model lie in the range of $\sim 0.20 - 0.24$ fm which is in harmony with the ones predicted by the Skyrme Hartree-Fock model. We also investigate the role of various mixed interaction terms which are crucial for the density dependence of the symmetry energy.

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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