Sigma-omega meson coupling and properties of nuclei and nuclear matter

摘要

We have constructed a Lagrangian model with a coupling of sigma and omega mesons in the relativistic mean-field theory. Properties of finite nuclei and nuclear matter are explored with the new Lagrangian model SIG-OM. The study shows that an excellent description of binding energies and charge radii of nuclei over a large range of isospin is achieved with SIG-OM. With an incompressibility of nuclear matter K = 265 MeV, it is also able to describe the breathing-mode isoscalar giant monopole resonance energies appropriately. It is shown that the high-density behaviour of the equation of state of nuclear and neutron matter with the sigma-omega coupling is much softer than that of the non-linear scalar coupling model. (c) 2008 Elsevier B.V. All rights reserved.