[en] The results of measured inclusive double differential cross sections of α particles emitted in the interaction of ¹²C ions with ⁵⁹Co and ⁹³Nb at incident energies of 300 and 400 MeV are presented. The analysis of these data allows us to isolate the contributions of the different reaction mechanisms, thereby confirming previous conclusions of a comprehensive analysis of a large number of excitation functions, forward recoil ranges and angular distributions of residues produced in the interaction of ¹²C with a target nucleus in the same mass range. In particular, the probabilities associated with α-particle reemission following incomplete fusion processes have been reaffirmed. Several refinements to the theoretical model proposed in earlier studies of the interaction of ¹²C with nuclei are presented