The angular asymmetry and the total cross section for the ${}_{}{}^3{}_{}{}^{}\mathrm{H}$($\gamma$,$d$) reaction have been measured. The total cross section measurement agrees with the most recent Faddeev-type calculation but the angular asymmetry departs from the prediction of a simple plane wave calculation that fits the ${}_{}{}^3{}_{}{}^{}\mathrm{He}$($\gamma$,$d$) data. In the absence of final state interactions the ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ and ${}_{}{}^3{}_{}{}^{}\mathrm{H}$ asymmetries should be related by -1/5 (i.e., the isospin dependence). These data would appear to indicate that the $E2$ final state interaction in the ${}_{}{}^3{}_{}{}^{}\mathrm{H}$ ($\gamma$,$d$) reaction has to be carefully treated.

NUCLEAR REACTIONS ${}_{}{}^3{}_{}{}^{}\mathrm{H}$($\gamma$,$d$), $E=15-36\mathrm{}$ MeV. Measured $\sigma (\theta ,E)$.

• Received 29 June 1981

DOI:https://doi.org/10.1103/PhysRevC.24.1791