Proc. Specialists' Meeting on the Nucleon Nucleus Optical Model up to 200 MeV (Bruyères-le-Chatel, France, 13-15 Nov. 1996) (Romain)

The dispersive optical model approach to nucleon scattering is extended from spherical nuclei to permanently deformed nuclei for the rst time. Here, a dispersive coupled channels analysis of proton and neutron scattering and reaction cross sections is presented for Ta and W for incident energies up to 200 MeV. A very good overall agreement between experimental data and predictions is achieved up to 65 MeV. Above this energy it is necessary to introduce an explicit treatment of the non-locality of the imaginary potential to achieve an excellent agreement.