Effects of short-range correlations on the self-energy in the optical model of finite nuclei

The real and imaginary parts for the self-energy of a nucleon interacting with a finite nucleus ( Oxygen 16) are derived from a realistic one-boson-exchange potential including terms up to second order in the Brueckner G-matrix. Effects of 2-particle-l-hole and 3-particle-2-hole correlations on the optical model potential are evaluated. The studies are performed in a mixed representation, employing a basis of oscillator functions for the occupied hole states and plane wave states for the unoccupied particle states . Attempts are discussed to represent the resulting selfenergies in terms of a local energy-dependent potential