arXiv:nucl-th/0011025·v1·Nuclear Theory
Nuclear matter properties in the relativistic mean field model with sigma-omega coupling
K. C. Chung (1)🇧🇷 · C. S. Wang (1,2)🇧🇷 · A. J. Santiago (1)🇧🇷 · J. W. Zhang (2) ((1) Instituto de Fisica, Universidade do Estado do Rio de Janeiro, Brazil, (2) Department of Technical Physics, Peking University, China)🇨🇳
Abstract
The possibility of extending the linear sigma-omega model by introducing a sigma-omega coupling phenomenologically is explored. It is shown that, in contrast to the usual Walecka model, not only the effective nucleon mass M* but also the effective sigma meson mass m*_sigma and the effective omega meson mass m*_omega are nucleon density dependent. When the model parameters are fitted to the nuclear saturation point (the nuclear radius constant r_0=1.14fm and volume energy a_1=16.0MeV) as well as to the effective nucleon mass M*=0.85M, the model yields m*_sigma=1.09m_sigma and m*_omega=0.90m_omega at the saturation point, and the nuclear incompressibility K_0=501MeV. The lowest value of K_0 given by this model by adjusting the model parameters is around 227MeV.
Comments: 5 pages and 3 figures