Low-Energy Optical-Model Studies Of Proton-Scattering On Fe-54 And Fe-56

Proton elastic and inelastic cross sections have been measured at a number of energies between 3.73 and 7.74 MeV on targets of Fe-54 and Fe-56. The (p,gamma) cross section was measured at the same energies. Coupled-channel effects on the absorption cross sections are examined and an analysis in terms of dispersion theory is presented. A good representation of single particle energies was obtained. Calculations of two-particle-one-hole state densities agree qualitatively with the imaginary potential differences, in that shell effects disappear above the Coulomb barrier.