The new member of the 2.97-MeV doublet in ${}_{}{}^{20}{}_{}{}^{}\mathrm{F}$ has a dominant $\gamma$ decay to a ($3^{-}$) state at 1971 keV, further evidence that the new state has $J^{\pi }=\left(4^{-}\right)$. The excitation energy is 2968.0±1.5 keV.

NUCLEAR REACTION ${}_{}{}^{11}{}_{}{}^{}\mathrm{B}({}_{}{}^{13}{}_{}{}^{}\mathrm{C}, \alpha \gamma )$, $E=18.5\mathrm{}$ MeV; measured $E_{\alpha }$, $E_{\gamma }$, $\alpha \gamma$ coincidences. ${}_{}{}^{20}{}_{}{}^{}\mathrm{F}$ deduced levels, gamma branchings, $J$, $\pi$.

• Received 17 July 1978

DOI:https://doi.org/10.1103/PhysRevC.18.2202