OFF-SHELL EFFECTS OF NUCLEON-NUCLEON POTENTIAL MODELS ON PROTON-NUCLEUS ELASTIC-SCATTERING OBSERVABLES

Spin observables and cross sections ar calculated for p + Ca-40 elastic scattering in a full-folding model using nucleon-nucleon (NN) free t-matrices based on the Paris and Bonn (OBE) potentials. The two sets of calculated observables are compared with each other, with conventional t-rho results and with data at 200 MeV. The differences between full-folding and t-rho results are striking, with the full-folding results being in much better agreement with the data. At this energy the choice between the two NN potentials considered is found to be less critical than a proper treatment of off-shell effects as prescribed by the full-folding model.