We present a comprehensive analysis on several features of liquid gas (LG) phase transition in warm asymmetric nuclear matter using relativistic mean field model with isoscalar-isovector ${\mathrm{\Lambda }}_v$ coupling. At subsaturation as well as supranormal densities, the ${\mathrm{\Lambda }}_v$ coupling systematically controls the density dependence of nuclear symmetry energy in the relativistic mean field model. We found that the boundary of LG phase-coexistence region increases with the higher values of ${\mathrm{\Lambda }}_v$ coupling. Similarly the maximal isospin asymmetry, critical pressure and critical temperature increases with the increasing values of ${\mathrm{\Lambda }}_v$, which shows that the liquid gas phase transition is quite sensitive to the density dependence of symmetry energy in hot asymmetric nuclear matter.

我们使用等量等差矢量的相对论平均场模型，对暖非对称核物质中液态气体（LG）相变的几个特征进行了全面分析 ${\mathrm{\Lambda }}_v$耦合。在亚饱和度以及超常密度下，${\mathrm{\Lambda }}_v$耦合在相对论平均场模型中系统地控制了核对称能量的密度依赖性。我们发现LG相存区域的边界随着${\mathrm{\Lambda }}_v$耦合。同样，最大同位旋不对称性，临界压力和临界温度随着的增加而增加。${\mathrm{\Lambda }}_v$，表明液相气相转变对热不对称核物质中对称能的密度依赖性非常敏感。