The exchange of effective mesons between nucleons in nuclei

A study is made of the nuclear matter G-matrix. A method is developed which allows the determination of a local G-operator. This method is applied to analyse the correlations of the G-matrix, i.e. G without the bare interaction V, in terms of meson-exchange-type interactions. For a strong potential (REID) these effective mesons have masses which exceed 800 MeV implying very short-ranged correlations. For a weaker potential these correlations are somewhat longer ranged. The dominant feature of these G-operator correlations is found to be a strong scalar isoscalar attractive interaction which provides the binding of the nuclear system. By comparing with exact results for Landau parameters and binding energies it is shown that the approximation made with this local operator is excellent. A weak density dependence of the correlations is found and the structure of the Landau parameter ǵ is discussed. Finally it is proposed that this G-operator is a suitable object to study finite nuclei.