Measurements have been made on the branching ratios for cascade decay of the $2^{+}$6.92- and the $1^{-}$7.12-MeV states of ${\mathrm{O}}^{16}$ through the $0^{+}$ 6.06-MeV state. For the 6.92-MeV state, the result, (2.9±0.4)×${10}^{-4\mathrm{}}$, is consistent with earlier results. For the 7.12-MeV state, an upper limit of <6×${10}^{-6\mathrm{}}$ is set on the cascade branch which corresponds to a strongly inhibited $E1\mathrm{}$ transition. The significance of this latter result for the structure of the 6.06-MeV state is discussed.

• Received 23 June 1967

DOI:https://doi.org/10.1103/PhysRev.163.1060