The total reaction cross section for ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ + ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ has been deduced in the energy range $E_{\mathrm{c}.\mathrm{m}.\mathrm{}}=5.5-12.8\mathrm{}$ MeV from elastic angular distributions using the sum-of-differences method. It exhibits as pronounced structures all quasimolecular resonances found in the $\alpha$-particle exit channel and additional new resonances.

NUCLEAR REACTIONS ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$(${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$, ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$), $E=5.5-12.8\mathrm{}$ MeV (c.m.), $\Delta E=25\mathrm{}$ keV; measured $\sigma (\theta , E)$, deduced total reaction cross section and quasimolecular resonances.

• Received 10 July 1980

DOI:https://doi.org/10.1103/PhysRevC.22.2462