Effects of theHe3DState in the ReactionH2(p,γ)He3

Angular distributions of the reaction ${}_{}{}^2{}_{}{}^{}\mathrm{H}(p,\gamma ){}_{}{}^3{}_{}{}^{}\mathrm{He}$ have been measured for $E_p$ from 6.5 to 16 MeV. A comparison of the extracted $a_2$ coefficients with an effective two-body direct calculation indicates a sensitivity to the inclusion of $D$-state components in the ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ wave function. These calculations use ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ bound-state wave functions generated from Faddeev-type equations. The theoretical three-body ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ ground-state wave functions having $D$-state probabilities of 5%-9% ($D_2=-0.224\mathrm{} \mathrm{to} -0.236\mathrm{}$) are consistent with the present data.