Elastic Scattering of 160-MeV Protons from Be9, Ca40, Ni58, Sn120, and Pb208

Abstract

Using a good-resolution total-energy scintillation spectrometer, the elastic-scattering differential cross sections of 160-MeV protons from ${\mathrm{Be}}^9$, ${\mathrm{Ca}}^{40}$, ${\mathrm{Ni}}^{58}$, ${\mathrm{Sn}}^{120}$, and ${\mathrm{Pb}}^{208}$ have been measured. Optical-model analyses of the data have been made, and the pertinent parameters are given. The most significant result of the analyses is that the extent of the imaginary part of the optical potential has a radius of the order of ${10}^{-13\mathrm{}}$ cm greater than that of the real part, independent of atomic weight.