Todd-Rutel B G, Piekarewicz J
Department of Physics, Florida State University, Tallahassee, Florida 32306, USA.
Phys Rev Lett. 2005 Sep 16;95(12):122501. doi: 10.1103/PhysRevLett.95.122501. Epub 2005 Sep 13.
An accurately calibrated relativistic parametrization is introduced to compute the ground state properties of finite nuclei, their linear response, and the structure of neutron stars. While similar in spirit to the successful NL3 parameter set, it produces an equation of state that is considerably softer--both for symmetric nuclear matter and for the symmetry energy. This softening appears to be required for an accurate description of several collective modes having different neutron-to-proton ratios. Among the predictions of this model are a symmetric nuclear-matter incompressibility of K=230 MeV and a neutron skin thickness in 208 Pb of Rn-Rp=0.21 fm. The impact of such a softening on various neutron-star properties is also examined.
引入了一种精确校准的相对论参数化方法来计算有限核的基态性质、它们的线性响应以及中子星的结构。虽然在精神上与成功的NL3参数集相似，但它产生的状态方程要软得多——无论是对于对称核物质还是对称能。这种软化似乎是准确描述几种具有不同中子与质子比的集体模式所必需的。该模型的预测包括对称核物质不可压缩性K = 230 MeV以及208Pb中中子皮厚度Rn - Rp = 0.21 fm。还研究了这种软化对各种中子星性质的影响。
