Intermediate structure inC12+C12elastic scattering

A band crossing model with a smooth-cutoff representation of absorption effects is applied to the intermediate structure observed in elastic scattering of the ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ + ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ system. The model is found to reproduce the experiment extremely well, which suggests strongly that the intermediate structure is a reflection of the existence of molecular resonances. The values of parameters in a smooth-cutoff representation of absorption effects are extracted by an analysis of the oscillatory fusion cross section.