The asymptotic D-state to S-state ratio of the ${}_{}{}^3{}_{}{}^{}\mathit{n}$+d cluster wave function (${\mathrm{\eta }}_{\mathit{t}}$) has been determined from measurements of sub-Coulomb (d→,t) tensor analyzing powers. New measurements of the tensor analyzing power ${\mathit{T}}_{20}$ for (d→,t) reactions on ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}$ and ${}_{}{}^{119}{}_{}{}^{}\mathrm{Sn}$ at several different energies are presented. These data, along with previous measurements of ${\mathit{T}}_{20}$ and ${\mathit{T}}_{21}$ for several additional reactions and energies, are used in a distorted-wave Born approximation analysis that includes nuclear tensor potentials as well as long-range tensor potentials that arise from Coulomb interactions. A weighted mean of all fourteen statistically independent values gives the result ${\mathrm{\eta }}_{\mathit{t}}$=-0.0431±0.0025, where the quoted uncertainty includes statistical and systematic contributions. This result is compared with previous measurements and with predictions obtained from Faddeev calculations.

• Received 14 April 1993

DOI:https://doi.org/10.1103/PhysRevC.48.688