Determination of the asymptoticD- toS-state ratio of the triton from sub-Coulomb (d→,t) reactions

Abstract
Angular distributions of the tensor analyzing power Azz have been measured for ground state transitions in Sn119(d→,t)118Sn and Sm149(d→,t)148Sm and the first excited state (0.263 MeV) in206Pb(d→,t)205Pb for deuteron energies well below the Coulomb barrier. Exact, finite-range distorted-wave Born approximation analyses of these data have been made to establish the asymptotic D- to S-state ratio for the triton, ηt. These calculations include a deuteron-nucleus tensor potential determined from the folding model and a long-range tensor potential arising from the Coulomb interaction. Previously obtained Azz(θ) data for the ground state transitions in Mo95(d→,t)94Mo, Sn119(d→,t)118Sn, and Sm149(d→,t)148Sm at different sub-Coulomb energies have been reanalyzed. Also a careful investigation of possible uncertainties in the value of ηt is presented. A best fit to the data gives ηt=-0.0411±0.0013±0.0012, somewhat lower than previous experimental determinations.