Artículo de publicación ISIWe develop an approach for incorporating both medium and off-shell effects in the calculation of full-folding nucleon-nucleus optical potentials for elastic scattering. The approach is based on a flexible scheme for calculating the nucleon-nucleon effective interaction in the nuclear medium. Using this scheme, we calculate a fully off-shell, energy-dependent effective force which includes effects arising from Pauli blocking and the nuclear mean field via an interacting nuclear matter model. Calculations of the elastic scattering observables for p+Ca-40 and for p+Pb-208 at energies between 30 and 400 MeV are presented and discussed. We also study total cross sections for neutron scattering off Ca-40, Zr-90, and Pb-208 in the 5 - 400 MeV energy range. The theory gives a reasonable overall description of the data in the energy range under study

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An analysis of neutron and proton scattering off 40,48 Ca has been carried out. Real and imaginary potentials have been generated using the Nuclear Structure Method for scattering with the Gogny D1S nucleon-nucleon effective interaction. Observables are well described by NSM for neutron and proton elastic scattering off 40 Ca and for neutron scattering off 48 Ca. For proton scattering off 48 Ca, NSM yields a lack of absorption. This discrepancy is attributed to double-charge-exchange contribution and coupling to Gamow-Teller mode which are not included in the present version of NSM. A recipe based on a Perey-Buck fit of NSM imaginary potential and Lane model is proposed to overcome this issue in an approximate way. PACS. PACS-key describing text of that key-PACS-key describing text of that key