RESONANT RADIATIVE CAPTURE AND MOLECULAR STATES IN $^{24}$Mg AND $^{28}$Si

The radiative capture process of the 12 C +12 C and 12 C +16 O reactions has been studied using the very selective 0° Dragon spectrometer at Triumf and its associated BGO γ-array. The experiments have been performed at energies around the Coulomb barrier where resonances in the process have been reported. Our results show previously unobserved γ-decay to doorway states in the 24 Mg and 28 Si respectively around 10 to 12 MeV. The nature of the states is discussed and two scenarii are proposed.