Measurement ofT20for the ReactionH1(dpol, γ)He3andD-State Effects inHe3

The tensor analyzing power $T_{20}$ for the radiative capture reaction ${}_{}{}^1{}_{}{}^{}\mathrm{H}(d_{\mathrm{pol}}, \gamma ){}_{}{}^3{}_{}{}^{}\mathrm{He}$ has been measured in order to test new three-body wave functions. This observable arises from the $D$ state of ${}_{}{}^3{}_{}{}^{}\mathrm{He}$. An effective two-body direct-capture calculation, which was previously shown to fit the $a_2$ coefficient of a Legendre-polynomial expansion of the differential cross section, is found to give a good description of the present data. A value for the asymptotic $\frac{D}{S}$ ratio is extracted from the data although it is found to be model dependent.