Search For Si-28 Cluster States Through The C-12+O-16 Radiative Capture

The C-12+O-16 resonant radiative capture reaction has been studied at 5 bombarding energies around the Coulomb barrier, between E-lab = 15.4 and 21.4 MeV. These experiments have been performed at the TRIUMF laboratory (Vancouver, Canada) using the Dragon 0 degrees spectrometer and the associated BGO array. The most remarkable result is the previously unobserved decay path through Si-28 doorway states of energies around 12 MeV leading to the measurement of new capture cross-sections. The feeding of specific, deformed states in Si-28 from the resonances is discussed, as well as the selective feeding of 1(+) T=1 states around 11 MeV.