Low-energy p-d Scattering: High Precision Data, Comparisons with Theory, and Phase-Shift Analyses
M. H. Wood, C. R. Brune, B. M. Fisher, H. J. Karwowski, D. S. Leonard, E. J. Ludwig, A. Kievsky, S. Rosati, M. Viviani
Abstract
Angular distributions of sigma(theta), Ay, iT11, T20, T21, and T22 have been measured for d-p scattering at Ec.m.=667 keV. 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. Single-energy phase-shift analyses were performed on this data set and a similar data set at Ec.m.=431.3 keV. The role of the different phase-shift parameters in fitting these data is discussed.
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