Density dependence of the nuclear symmetry energy from measurements of neutron radii in nuclei
Density dependence of the nuclear symmetry energy from measurements of neutron radii in nuclei
复制标题
原子核中子半径测量中核对称能的密度依赖性
DOI：
10.1063/1.4891141
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发表时间：
2014
影响因子：
4.4
通讯作者：
M. Warda
中科院分区：
文献类型：
--
作者：
X. Viñas;M. Centelles;X. Roca;M. Warda
利用有限核中中子半径和中子皮厚度提供的信息，研究了以斜率参数L表征的核对称能的密度依赖性.这些量是从反质子原子中获得的数据的分析中提取的，从宇称违反不对称性在低动量转移极化电子散射在208铅，并从电偶极子极化率通过极化质子非弹性散射在208铅在前向角。所有这些实验都对对称能的斜率L提供了不同的约束，但相应的值在50 MeV ≤ L ≤ 70 MeV的范围内有相当大的重叠，与其他使用不同观测量和方法提取L的估计值合理一致。
We study the density dependence of the nuclear symmetry energy, characterized by its slope parameter L, by means of the information provided by the neutron radius and the neutron skin thickness in finite nuclei. These quantities are extracted from the analysis of data obtained in antiprotonic atoms, from the parity-violating asymmetry at low-momentum transfer in polarized electron scattering in 208Pb, and from the electric dipole polarizability obtained via polarized proton inelastic scattering at forward angles in 208Pb. All these experiments provide different constraints on the slope L of the symmetry energy but the corresponding values have a considerable overlap in a range around 50 MeV ≤ L ≤ 70 MeV, in a reasonable agreement with other estimates that use different observables and methods to extract L.