The gamma ray to proton branching ratio, ${\Gamma }_{\gamma }$/${\Gamma }_{\mathrm{p}}$, of the ${}_{}{}^2{}_{}{}^{}$H${+\mathrm{}}^3$He reaction has been measured between center-of-mass energies of 25 and 60 keV. The ratio of the ground-state gamma reaction ${}_{}{}^2{}_{}{}^{}\mathrm{H}$${(}^3$He,${\gamma }_0$${)\mathrm{}}^5$Li to the dominant reaction ${}_{}{}^2{}_{}{}^{}\mathrm{H}$${(}^3$He,p${)}^4$He is observed to be roughly constant over this energy range with a best value of (4.5±1.2)×${10}^{\mathrm{-}5}$. This ratio for the gamma-ray reaction to the ${}_{}{}^5{}_{}{}^{}\mathrm{Li}$ first excited state is measured to have a value of (8±3)×${10}^{\mathrm{-}5}$. The excitation energy of the first excited state is estimated to be 3.0±1.0 MeV.

• Received 17 June 1985

DOI:https://doi.org/10.1103/PhysRevC.32.690