Analysis of Elastic Cross Sections and Polarization of 10-Mev Protons

The differential elastic cross section and polarization of 10-Mev protons scattered by argon and copper have been analyzed using a diffuse surface optical model potential with a spin-orbit term. The model parameters were varied systematically, the best fits with the experimental data being determined by a method of least squares. As in other analyses, it was found that almost equally good fits could be obtained over a range of values of the radius constant, $R_0$, in this case, for $R_0$ approximately between 1.20 and 1.30. Only the value of the real part of the central potential was markedly different for the best fits obtained for various $R_0$ in this range. The experimental polarization data is not precise enough to determine the spin-orbit potentials to within better than 1 or 2 Mev.