The results of a set of experiments on the 12 C + 12 C ! 8 Beg:s: + 16 O excitation function between 20 and 36 MeV c.m. beam energy are summarized and discussed. A set of 1 MeV wide resonances shows up in the energy range investigated, all of them following the rotational rule with a coefficient of inertia consistent with a , 16 O , configuration. PACS 25.70.Ef -Resonances. PACS 21.60.Gx -Cluster model.