The $\gamma$ decays of the levels at 17.77 and 18.36 MeV in ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ are studied by proton capture and the assignments of ($0^{+}$,1) and ($3^{-}$,1), respectively, are confirmed. The very great strength of the decay of the ($0^{+}$,1) level to the lower ($1^{+}$,0) level at 12.71 MeV is consistent with a spin- and isospin-flip deuteronlike transition. The strong decay of the ($3^{-}$,1) level to the lower ($3^{-}$,0) level at 9.64 MeV is fairly typical of an analog to antianalog transition. The $\gamma$-decay widths of these levels are compared with shell-model calculations.

NUCLEAR REACTIONS ${}_{}{}^{11}{}_{}{}^{}\mathrm{B}$($p$,$\gamma$)${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$, $E_p=0.82-2.83\mathrm{}$ MeV. Measured excitation functions and angular distributions of resonances at 17.77 and 18.36 MeV; deduced spins, parities, and transition strengths to levels at 12.71 and 9.64 MeV, respectively. Enriched targets.

• Received 16 November 1981

DOI:https://doi.org/10.1103/PhysRevC.25.1179