Optical-model partial-wave analyses of p-He4 elastic scattering

Abstract

We have performed optical-model calculations using the Klein-Gordon and the Dirac equations for the 600 MeV p-He4 scattering experiments of Boschitz et al., and the 1050 MeV p-He4 scattering experiments of Baker et al. We have compared these analyses with our previous analysis of the 1000 MeV p-He4 experiment of Palevsky et al. In comparing the results at the three energies we find that the experiments require a slightly energy-dependent optical potential rms radius. The average value is in good agreement with the He4 matter radius obtained from electron scattering, and substantially smaller than the low energy He4 optical potential rms radius. On the other hand, the experiments require quite different values for the optical potential strength parameters. NUCLEAR REACTIONS He4(p, p) E=600, 1000, 1050 MeV, () calculated, deduced optical-model parameters. © 1976 The American Physical Society.