Excitation functions for ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ + ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ inelastic scattering to the $0_{}^{+}{}_2{}^{}$, $3_{}^{-}{}_1{}^{}$, and $4_{}^{+}{}_1{}^{}$ levels have been measured over the energy range of the gross structure resonances seen in the single and mutual $2_{}^{+}{}_1{}^{}$ inelastic scattering channels. Resonant structure is observed which is similar to, but more fragmented than, that in the low lying channels. The general features of the results are in agreement with the band crossing model of the ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ + ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ interaction, but detailed comparison indicates some serious discrepancies. Particularly, a strong resonance in the $0_{}^{+}{}_2{}^{}$ channel violates the band crossing hypothesis.

NUCLEAR REACTIONS ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ (${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$, ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$) ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}_{}^{*}{}_{}{}^{}$; $E_{\mathrm{lab}}=44\mathrm{} \mathrm{to} 80$ MeV; ${\theta }_{\mathrm{lab}}=15\mathrm{}° \mathrm{to} 25°$; Measured $\sigma (\theta ,E)$ for $0_{}^{+}{}_2{}^{}$, $3_{}^{-}{}_1{}^{}$, and $4_{}^{+}{}_1{}^{}$; Deduced energies and widths of intermediate structures in ${}_{}{}^{24}{}_{}{}^{}\mathrm{Mg}$.

• Received 9 August 1979

DOI:https://doi.org/10.1103/PhysRevC.21.198