| A new spin-exchange optical pumping polarized 3He target has been used to measure angular distributions of A0 y, Ayy, and Axx for p+3He elastic scattering at proton energies of 2.28, 2.77, 3.15, 4.02, and 5.54 MeV. The new data, along with previous cross-section and beam analyzing power measurements were included in a global phase-shift analysis of data below 12 MeV. The additional data resolved the ambiguity in that analysis, and a unique set of energy-dependent phase-shifts was obtained. These phase-shifts, as well as the data themselves, were compared to theoretical calculations using realistic nuclear potential models that accurately reproduce NN scattering data. These calculations underpredicted A0 y, in addition to the previously-observed underprediction of Ay0 known as the "Ay puzzle". The spin-correlation coefficients were found to be better reproduced. There was good agreement for the S-wave phase-shifts, while the P-wave phases showed small discrepancies, especially for 3P2 and 3P0, and different discrepancies were observed for different interaction models. |
