Modification of the radial shape of the real part of microscopic optical potential by second-order diagrams

The modification of the radial shape of the real part of the microscopic optical potential by the imaginary part of the off-shell single-particle potential from second-order diagram contributions is discussed by using the Skyrme interaction SKa, and by means of the dispersion relation and local density approximation. As an example, the modified values for 40Ca at E-EF ≤ 50 MeV are calculated. The calculated results lead to slightly deeper real part of the optical potential. The modification is larger near the nuclear surface at lower energies, and is larger in the nuclear center region at higher energies