The tensor analyzing power $T_{20}({\theta }_{\mathrm{lab}}=90\mathrm{}°)$ has been measured to high precision for the reaction ${}^1$H$(d\to ,\gamma {)}^3$He at $E_d=80\mathrm{}-0$ keV. Direct capture calculations of $T_{20}\left(90\mathrm{}°\right)$ have been performed using asymptotic forms for the bound state ${}^3$He wave function while varying the asymptotic $D$- to $S$-state ratio $\eta$. A best-fit value for $\eta$ was extracted and found to be $-0.0399\pm {0.0091}_{-0.0019}^{+0.0012\mathrm{}}$. The model dependence of this result is discussed.

• Received 21 May 1996

DOI:https://doi.org/10.1103/PhysRevC.55.2700