Low-energy p-d scattering: High-precision data, comparisons with theory, and phase-shift analyses

Angular distributions of σ(θ), A_y, iT₁₁, T₂₀, T₂₁, and T₂₂ have been measured for d-p scattering at E_c.m.=667keV. This set of high-precision data is compared to variational calculations with the nucleon-nucleon potential alone and also to calculations including a three-nucleon (3N) potential. Agreement with cross section and tensor analyzing power data is excellent when a 3N potential is used. However, a comparison between the vector analyzing powers reveals differences of approximately 40% in the maxima of the angular distributions which is larger than reported at higher energies for both p-d and n-d scattering. The inclusion of phenomenological spin-orbit forces in a 3N potential improves the comparison with vector analyzing powers substantially. Single-energy phase-shift analyses were performed on this data set and a similar data set at E_c.m.=431.3keV. The role of the different phase-shift parameters in fitting these data is discussed.