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arXiv 1003.5225nucl-th
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原子核中子皮的体贡献和表面贡献分析

Analysis of bulk and surface contributions in the neutron skin of nuclei

M. Warda, X. Viñas, X. Roca-Maza, M. Centelles

摘要:

原子核的中子皮厚度是探测原子核对称能的灵敏探针,对核物理和天体物理研究具有重要意义。然而,这种可观测的精确测量是困难的。对实验数据的分析可能意味着对形成中子皮的体或表面性质的一些假设。在这里,我们研究的体积或表面特性的中子皮的核以下计算与Gogny,Skyrme和协变核平均场相互作用。这些相互作用在描述核电荷半径和结合能方面是成功的,但是对于中子皮预测不同的值。我们通过拟合两个参数的费米分布计算的自洽中子和质子密度进行研究。我们注意到等效尖半径是一个比费米分布的半密度半径参数更合适的参考量,以区分中子皮中的体贡献和表面贡献。我们目前的计算核的稳定谷和Sn和Pb的同位素链。

英文摘要:

The neutron skin thickness of nuclei is a sensitive probe of the nuclear symmetry energy having multiple implications for nuclear and astrophysical studies. However, precision measurements of this observable are difficult. The analysis of the experimental data may imply some assumptions about the bulk or surface nature of the formation of the neutron skin. Here, we study the bulk or surface character of neutron skins of nuclei following from calculations with Gogny, Skyrme, and covariant nuclear mean-field interactions. These interactions are successful in describing nuclear charge radii and binding energies but predict different values for neutron skins. We perform the study by fitting two-parameter Fermi distributions to the calculated self-consistent neutron and proton densities. We note that the equivalent sharp radius is a more suitable reference quantity than the half-density radius parameter of the Fermi distributions to discern between the bulk and surface contributions in neutron skins. We present calculations for nuclei in the stability valley and for the isotopic chains of Sn and Pb.

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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