Insights into nuclear clusters in 28Si via resonant radiative capture measurements

The heavy-ion radiative capture reaction 12C(16O,γ)28Si has been studied at three energies on- (ELab = 20.0 and 21.2 MeV) and off- (ELab = 20.7 MeV) resonance at Triumf (Vancouver) using the state-of-the-art Dragon 0° spectrometer and its very efficient associated BGO γ array. Intermediate states around Ex = 11.5 MeV, carrying a large part of the resonant flux have been observed for the first time in this system. The nature of those doorway states is discussed in terms of recently calculated cluster bands in 28Si. The results are compared to a recent similar investigation of the 12C(12C,γ)24Mg reaction.