DENSITY-DEPENDENT EFFECTIVE INTERACTIONS

An effective two nucleon interaction is defined by an optimal fit to select on- and half-off-of-the-energy shell t and g matrices determined by solutions of the Lippmann-Schwinger and Brueckner-Bethe-Goldstone equations with the Paris two nucleon interaction as input. As such, it reproduces the interaction on which it is based better than other commonly used, density-dependent effective interactions. This new (medium modified) effective interaction, when folded with appropriate density matrices, has been used to define proton-C-12 and proton-O-16 optical potentials. With them elastic-scattering data are well fit and the medium effects identifiable.