Intermediate resonance have been studied in the ${}_{}{}^{24}{}_{}{}^{}\mathrm{Mg}(\alpha , {}_{}{}^{12}{}_{}{}^{}\mathrm{C})$ ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ and ${}_{}{}^{24}{}_{}{}^{}\mathrm{Mg}(\alpha , {\alpha }^{\prime }){}_{}{}^{24}{}_{}{}^{}\mathrm{Mg}$ reactions. The excitation functions were measured in the energy range between 22 and 26 MeV. Significant anomalies have been found at $E_{\mathrm{c}.\mathrm{m}.\mathrm{}} (\mathrm{in} {}_{}{}^{12}{}_{}{}^{}\mathrm{C}+{}_{}{}^{16}{}_{}{}^{}\mathrm{O} \mathrm{system})=12.73, 13.7, 14.0, 14.35, \mathrm{and} 14.76$ MeV. Angular distributions of ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ nuceli have been measured at these energies. The spins and parities of these intermediate resonance states are assigned as $7^{-}$, 8+, $9^{-}$(8+), $9^{-}$, and $9^{-}$, respectively. Angular distributions of the elastic and inelastic scattering have been measured at these energies.

NUCLEAR REACTIONS ${}_{}{}^{24}{}_{}{}^{}\mathrm{Mg}(\alpha , {}_{}{}^{12}{}_{}{}^{}\mathrm{C})$, ${}_{}{}^{24}{}_{}{}^{}\mathrm{Mg}(\alpha , {\alpha }^{\prime })$, $22<~E_{\alpha }<~26$ MeV; measured $\sigma \left(E_{\alpha }\right){\theta }_{\mathrm{lab}}=7\mathrm{}°, 16°$, $E_{\alpha }=22.77, 24.25, 24.65, 24.86, 25.13, 25.38$ MeV; measured $\sigma \left(\theta \right)$ deduced $J^{\pi }$, enriched target.

• Received 23 June 1978

DOI:https://doi.org/10.1103/PhysRevC.18.2457