The elastic scattering of intermediate energy protons from 40Ca and 208Pb

Elastic scattering of protons from 40Ca and 208Pb has been studied using the MRS facility at TRIUMF. Cross section and analyzing power (Aγ) angular distributions to 500 in the center of mass have been measured for incident proton energies of 200, 300, 400 and 500 MeV. Comparisons of the experimental results are made with calculations based on relativistic and non-relativistic phenomenological models, and with relativistic and non-relativistic microscopic models. The differences between the results of the non-relativistic and relativistic models manifest themselves in the spin observables. They are found to be smaller in the phenomenological approach than in the microscopic one and they depend on energy. (orig.)