Single-particle and cluster modes of C-13 excited states of 3.09, 8.86 and 9.89 MeV

The elastic and inelastic scatterings of deuterons from C-13 are registered in a wide range of angles at the laboratory energy of 14.5 MeV. Data on the differential cross-sections are treated within both the optical model and coupled-channels method. A new set of optical potential parameters is found. Analyses of the d +C-13 * nuclear reactions are carried out for the levels of excitation 3.089, 8.86 and 9.87 MeV. The single particle C-12 + n, and cluster Be-9 + alpha of models are applied in calculations of differential cross-sections. The calculations show that the state 3.089 MeV is populated with the single particle configuration, while the latter bands 8.86 MeV and 9.87 MeV mainly have the cluster Be-9 + alpha excitation. The major contribution of the Hoyle state of the core C-12 is not observexl, but the cluster Be-9 + alpha configuration is ascertained to be the main contributor to the state 8.86 MeV.