Elastic and inelastic excitation functions and differential cross sections of $\alpha$ particles scattered from ${\mathrm{C}}^{12}$ have been measured. Excitation functions were taken from 18.90 to 30.06 MeV in 20-keV steps. Differential cross sections were measured at the energies of anomalies in the excitation functions. Optical-model and phase-shift fits to the elastic angular distributions were attempted without success. A statistical analysis of the excitation function indicates that the reaction is proceeding mainly through the compound nucleus with a coherence width $\Gamma$ of 360 keV (c.m.).

• Received 21 August 1969

DOI:https://doi.org/10.1103/PhysRevC.1.155