Angular distributions for the target spin-dependent observables A0y, Axx, and Ayy have been measured using polarized proton beams at several energies between 2 and 6 MeV and a spin-exchange optical pumping polarized 3 He target. These measurements have been included in a global phaseshift analysis following that of George and Knutson, who reported two best-fit phase-shift solutions to the previous global p+ 3 He elastic scattering database below 12 MeV. These new measurements, along with measurements of cross-section and beam-analyzing power made over a similar energy range by Fisher et al., allowed a single, unique solution to be obtained. The new measurements and phase-shifts are compared with theoretical calculations using realistic nucleon-nucleon potential models.

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Cross-section measurements have been made at 16 and 19 MeV in two exit-channel configurations of neutron-deuteron breakup: the space-star and coplanar star. In this kinematically-complete measurement, the outgoing proton and one of the neutrons were detected in coincidence and their energies were determined via time-of-flight techniques. Monte-Carlo simulations based on rigorous three-nucleon Faddeev calculations using the CD-Bonn nucleon-nucleon potential were used to compare the experimental results with theory. Large discrepancies between data and theory were found in both breakup configurations measured at both energies, suggesting deficiencies in current theoretical treatment of three-nucleon forces or in present knowledge of the neutron-neutron 1 S0 force.