Proton-3He Elastic Scattering at Intermediate Energies

We present a precise measurement of the cross section, proton and 3He analyzing powers, and spin correlation coefficient Cy,y for the p-3He elastic scattering near 65 MeV, and comparison with rigorous four-nucleon scattering calculations based on realistic nuclear potentials and a model with Δ-isobar excitation. Clear discrepancies are seen in some of the measured observables in the regime around the cross section minimum. Theoretical predictions using scaling relations between the calculated cross section and the 3He binding energy are not successful in reproducing the data. Large sensitivity to the NN potentials and rather small Δ-isobar effects in the calculated cross section are noticed as different features from those in the deuteron-proton elastic scattering. The results obtained above indicate that p-3He scattering at intermediate energies is an excellent tool to explore the nuclear interactions not accessible by the three-nucleon scattering