Application of density dependent parametrization models to asymmetric nuclear matter
Application of density dependent parametrization models to asymmetric nuclear matter
复制标题
DOI：
10.1103/physrevc.75.048801
复制
发表时间：
2007-02
影响因子：
3.1
通讯作者：
B. Liu;M. Toro;V. Greco;C. Shen;E.G.Zhao;B.X.Sun
中科院分区：
文献类型：
--
作者：
B. Liu;M. Toro;V. Greco;C. Shen;E.G.Zhao;B.X.Sun
Density dependent parametrization models of the nucleon-meson effective couplings, including the isovector scalar delta-field, are applied to asymmetric nuclear matter. The nuclear equation of state and the neutron star properties are studied in an effective Lagrangian density approach, using the relativistic mean field hadron theory. It is known that the introduction of a delta-meson in the constant coupling scheme leads to an increase of the symmetry energy at high density and so to larger neutron star masses, in a pure nucleon-lepton scheme. We use here a more microscopic density dependent model of the nucleon-meson couplings to study the properties of neutron star matter and to reexamine the delta-field effects in asymmetric nuclear matter. Our calculations show that, due to the increase of the effective delta coupling at high density, with density dependent couplings the neutron star masses in fact can be even reduced.
