Relativistic mean-field fit to microscopic results in nuclear matter

The results of a recent relativistic Dirac-Brueckner calculation of nuclear matter are fitted to different versions of the relativistic mean-field model. It is shown that the non-linear mean-field model and the linear model with a density-dependent scalar meson mass describe well the binding energy of nuclear matter over a wide range of nuclear densities. The scalar and vector components of the self-energy, however, are not individually reproduced correctly in the whole fitted window. Nevertheless, the parameterization, which may be considered to be equivalent to the relativistic G-matrix in the range of normal nuclear densities, is found. (author)