Neutron-skin thickness of finite nuclei in relativistic mean-field models with chiral limits
Neutron-skin thickness of finite nuclei in relativistic mean-field models with chiral limits
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DOI：
10.1103/physrevc.76.054314
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发表时间：
2007-07
影响因子：
3.1
通讯作者：
Wei-Zhou Jiang;Bao-An Li;Lie-Wen Chen
中科院分区：
文献类型：
--
作者：
Wei-Zhou Jiang;Bao-An Li;Lie-Wen Chen
我们用基于Brown-Rho标度的相对论平均场拉格朗日函数研究了有限核的几种结构性质，这是由于高密度下的手征对称性恢复所致。这些模型与目前对称物质在正常密度和超常密度下的状态方程以及非对称物质在亚饱和密度下的状态方程的实验约束是一致的。结果表明，这些模型可以很好地描述有限核的结合能和电荷半径。与通常的相对论平均场模型的计算相比，这些模型给出的中子皮厚度在0.17fm到0.21fm之间。预测的中子皮厚度的减小不仅是由于对称性能量的软化，而且是由于手征对称性的部分恢复所需要的介子的标度性质。
We study several structure properties of finite nuclei using relativistic mean-field Lagrangians constructed according to the Brown-Rho scaling due to the chiral symmetry restoration at high densities. The models are consistent with current experimental constraints for the equations of state of symmetric matter at both normal and supranormal densities and of asymmetric matter at subsaturation densities. It is shown that these models can successfully describe the binding energies and charge radii of finite nuclei. Compared to calculations with usual relativistic mean-field models, these models give a reduced thickness of neutron skin in $^{208}\mathrm{Pb}$ between 0.17 fm and 0.21 fm. The reduction of the predicted neutron skin thickness is found to be due to not only the softening of the symmetry energy but also the scaling property of $\ensuremath{\rho}$ meson required by the partial restoration of chiral symmetry.