Direct Interaction in the Inelastic Scattering of High Energy Protons in Carbon

The angular distribution of elastic and inelastic scattering of 89 Mev protons in carbon is calculated on the distorted wave approximation, assuming direct interaction in inelastic collisions. Different forms of nuclear potential are tried, and it is found that a satisfactory fit with the experimental curves may be obtained, provided direct interaction is assumed to take place throughout the nuclear volume, and not just at the surface. The Born approximation gives diffraction minima which are much too low, at angles which are appreciably too large; and gives far too little scattering at small angles for electric quadrupole excitation.