Microscopic Mechanism of Neutron-proton Effective Mass Splitting in Neutron-rich Nuclear Matter

We explore the mechanism of the isospin splitting of neutron and proton effective masses in neutronrich nuclear matter within the framework of the Brueckner-Hartree-Fock (BHF) approach. First we find that the neutron-proton effective mass splitting in neutron-rich matter is dominated by the nonlocality of the microscopic s. p. potentials in spatial space,i. e.,by the isospin splitting of the k-mass shown in Fig.

Extension of BHF Approach to Include Microscopic Three-body Rearrangement Effect

We extend the Brueckner-Hartree-Fock (BHF) approach by including the rearrangement contribution of a microscopic three-body force in calculating the single particle properties of nuclear matter. In the BHF approach, the TBF contribution is included by reducing the TBF to an equivalent effective two-body force V3eff. This effective force V3eff is density dependent. Due to the density dependence of the effective force V3eff, inclusion of the TBF in the BHF calculation may introduce an extra contribution UTBF to the single nu-

Isospin Splitting of Neutron and Proton Effective Masses in Neutron-rich Nuclear Matter

We investigate the isospin splitting of neutron and proton effective masses in neutron-rich nuclear matter by using Brueckner-Hartree-Fock (BHF) approach and the extended BHF (EBHF) approach including the ground state correlation contributions. The realistic nucleon-nucleon interaction adopted in our calculation is the Argonne V18 two-body force supplemented with a microscopic three-body force constructed from the meson-exchange current approach. The result is reported in Fig. 1 where the neutron and proton effective masses are plotted as functions of isospin asymmetry parameterβ. It is shown that in both cases by adopting the BHF and EBHF approaches, the predicted neutron effective mass is greater

Three-nucleon Force Effect on Critical Density for Kaon Condensation in Neutron Star Matter

The effect of a microscopic nuclear three-body force (TBF) on the critical baryon density ρc for kaon condensation in chemical equilibrium neutron star matter has been investigated in the framework of the Brueckner-Hartree-Fock approach. The calculated values of the critical density are given in Tab.1 for both cases with and without including the TBF contribution and for three different choices of the proton strangeness content (i.e.,

Critical Properties of Liquid-gas Phase Transition for Hot Nuclear Matter

The critical properties of the liquid-gas phase transition of hot nuclear matter have been investigated within the finite temperature Brueckner-Hartree-Fook (FTBHF) approach extended by introducing a microscopic three-body force (TBF). In Fig.1 is plotted the calculated equation of state (EOS) of symmetric nuclear matter, where the solid and dashed isothermal curves of pressure (corresponding to T = 0,8,10,12,14,16 MeV from the

Kaon Condensed Phase in Neutron Star Matter and Three-nucleon Force Effect

In the framework of the isospin dependent Brueckner-Hartree-Fock approach, the density and momentum dependence of symmetry potential has been investigated by adopting the Argonne V18(AV18) two-body nucleon-nucleon interaction plus a microscopic three-body force (TBF). The symmetry potential is defined as,

Superfluid nuclear matter in BCS theory and beyond

Medium polarization eflects are studied for 1S0 pairing in nuclear matter within BHF approach. The screening potential is calculated in the RPA limit, suitably renormalized to cure the low density mechanical instability of nuclear matter. The self-energy corrections are consistently included resulting in a strong depletion of the Fermi surface. The self-energy effects always lead to a quenching of the gap, whereas it is almost completely compensated by the anti-screening effect in nuclear matter.

非对称核物质不可压缩系数的微观计算(英文)

在带微观三体力的Brueckner-Hartree-Fock方法下研究了非对称核物质的不可压缩系数,得到了不可压缩系数的同位旋以及密度依赖,并做了进一步的讨论。在一定密度下,不可压缩系数作为同位旋非对称度的函数随同位旋单调递增。预测了非对称核物质在平衡态的同位旋依赖性质并与其他理论方法做了比较。