Angular distributions of the tensor analyzing power ${\mathit{A}}_{\mathit{z}\mathit{z}}$ have been measured for ground state transitions in ${}_{}{}^{119}{}_{}{}^{}\mathrm{Sn}$(d→,t${)}^{118}$Sn and ${}_{}{}^{149}{}_{}{}^{}\mathrm{Sm}$(d→,t${)}^{148}$Sm and the first excited state (0.263 MeV) ${\mathrm{in}}^{206}$Pb(d→,t${)}^{205}$Pb 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, ${\mathrm{\eta }}_{\mathit{t}}$. 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 ${\mathit{A}}_{\mathit{z}\mathit{z}}$(θ) data for the ground state transitions in ${}_{}{}^{95}{}_{}{}^{}\mathrm{Mo}$(d→,t${)}^{94}$Mo, ${}_{}{}^{119}{}_{}{}^{}\mathrm{Sn}$(d→,t${)}^{118}$Sn, and ${}_{}{}^{149}{}_{}{}^{}\mathrm{Sm}$(d→,t${)}^{148}$Sm at different sub-Coulomb energies have been reanalyzed. Also a careful investigation of possible uncertainties in the value of ${\mathrm{\eta }}_{\mathit{t}}$ is presented. A best fit to the data gives ${\mathrm{\eta }}_{\mathit{t}}$=-0.0411±0.0013±0.0012, somewhat lower than previous experimental determinations.

• Received 5 July 1994

DOI:https://doi.org/10.1103/PhysRevC.50.2695