Angular distributions of cross section and analyzing power were measured for the ${}_{}{}^3{}_{}{}^{}\mathrm{H}$(p→,γ) ${\mathrm{}}^4$He reaction at $E_{\mathrm{p}=9.0\mathrm{}}$ MeV. A transition matrix element analysis including E1 and E2 terms showed the triplet electric quadrupole ${(}^3$${\mathrm{D}}_2$) amplitude to be larger than predicted by shell model or direct capture calculations. It is shown that the inclusion of M2 terms in the T-matrix element analysis does not reduce the ${}_{}{}^3{}_{}{}^{}\mathrm{D}_2^{}{}_{}{}^{}$ amplitude, but that the inclusion of E3 terms does.

• Received 15 July 1985

DOI:https://doi.org/10.1103/PhysRevC.32.2155