Elastic Scattering and Polarization of Protons by Helium at 147 and 66 Mev

Measurements have been made of the polarization and differential cross section in elastic p-α scattering at 147 and 66 Mev, in the laboratory angular ranges of 2^∘{}-165^∘{} and 10^∘{}-45^∘{}, respectively. These have been compared with recent calculations which relate the scattering amplitudes to nucleon-nucleon results. Because these calculations take into account the angular variation of the nucleon-nucleon amplitudes, better agreement is obtained than heretofore. A comparison of the polarization with that observed in inelastic scattering from several levels of a variety of spin-zero nuclei indicates a strong similarity between the elastic and inelastic data, which can be explained theoretically.