Fine Structure in the Fusion Cross Section forO16+C12

$\gamma$-ray excitation functions have been measured for several residual nuclei in the ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ + ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ system, from $E_{\mathrm{c}.\mathrm{m}.\mathrm{}}=12.2\mathrm{} \mathrm{to} 15.0$ MeV in steps of ∼ 27 keV. In addition to three known resonances, a fine correlated structure is found superimposed over a broad resonance, as suggested by the mechanism of a fragmented shape resonance. The data may also be interpreted to indicate that the system decays via two different paths.