Resonant Radiative Capture And Molecular States In Mg-24 And Si-28

The radiative capture process of the C-12 + C-12 and C-12 + O-16 reactions has been studied using the very selective 0 degrees Dragon spectrometer at Triumf and its associated BGO gamma-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 gamma-decay to doorway states in the Mg-24 and Si-28 respectively around 10 to 12 MeV. The nature of the states is discussed and two scenarii are proposed.