Research Center for Nuclear Physics, Osaka University, Ibaraki, Japan.
Phys Rev Lett. 2011 Aug 5;107(6):062502. doi: 10.1103/PhysRevLett.107.062502. Epub 2011 Aug 3.
A benchmark experiment on (208)Pb shows that polarized proton inelastic scattering at very forward angles including 0° is a powerful tool for high-resolution studies of electric dipole (E1) and spin magnetic dipole (M1) modes in nuclei over a broad excitation energy range to test up-to-date nuclear models. The extracted E1 polarizability leads to a neutron skin thickness r(skin) = 0.156(-0.021)(+0.025) fm in (208)Pb derived within a mean-field model [Phys. Rev. C 81, 051303 (2010)], thereby constraining the symmetry energy and its density dependence relevant to the description of neutron stars.
一项关于 (208)Pb 的基准实验表明，在非常前向角（包括 0°）进行的极化质子非弹性散射是研究原子核中电偶极（E1）和自旋磁偶极（M1）模式的高分辨率的有力工具，其激发能量范围很广，可用于检验最新的核模型。在平均场模型中，提取的 E1 极化率导致了在 (208)Pb 中得出的中子皮厚度 r(skin) = 0.156(-0.021)(+0.025)fm[Phys. Rev. C 81, 051303 (2010)]，从而约束了对称能及其与描述中子星相关的密度依赖性。
