Field theoretical description of exchange terms in nuclear systems

In this work we suggest a possible origin of the σ-meson in nuclear systems in terms of the bare Nucleon-Nucleon interaction. Starting from an effective interaction determined by a G-matrix calculation, we show that the intermediate range of this effective interaction can be described to a good approximation by an exchange of scalar mesons, whose fitted masses and coupling constants are in good agreement with the values of standard relativistic mean field parametrization