Nuclear matter properties in relativistic mean-field model with σ- ω coupling

The σ-ω coupling is introduced phenomenologically in the linear σ-ω model to study the nuclear matter properties. It is shown that not only the effective nucleon mass M* but also the effective σ meson mass mσ* and the effective ω meson mass mω* are nucleon-density-dependent. When the model parameters are fitted to the nuclear saturation point, with the nuclear radius constant r0 = 1.14 fm and volume energy a1 = 16.0 MeV, as well as to the effective nucleon mass M* = 0.85M, the model yields mσ* = 1.09mσ and mω* = 0.90mω at the saturation point, and the nuclear incompressibility K0 = 501 MeV. The lowest value of K0 given by this model by adjusting the model parameters is around 227 MeV.