The $\alpha$ particle angular distributions measured on and off the 12.8 MeV resonance in the ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ + ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ system have been used to deduce spin and parity values of $7^{-}$ for the resonance. These results are in disagreement with all existing theoretical predictions.

NUCLEAR REACTIONS ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$(${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$,$\alpha$)${}_{}{}^{24}{}_{}{}^{}\mathrm{Mg}$, $E_{\mathrm{c}.\mathrm{m}.\mathrm{}}=12.80\mathrm{} \mathrm{and} 13.01$ MeV; measured $\sigma \left(\theta \right)$ for $\alpha$ particles. Deduced $J^{\pi }$ for the 12.8 MeV resonance.

• Received 20 November 1978

DOI:https://doi.org/10.1103/PhysRevC.19.1557