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Physical Review C 85 (2012) 034333
12C(16O,γ )28Si radiative capture: Structural and statistical aspects of the γ decay
D. Lebhertz1, 2, S. Courtin1, F. Haas1, D.G. Jenkins, C. Simenel3, M.-D. Salsac, D.A. Hutcheon, C. Beck1, J. Cseh, J. Darai, C. Davis, R.G. Glover, A. Goasduff1, P.E. Kent, G. Levai, P.L. Marley, A. Michalon, J.E. Pearson, M. Rousseau1, N. Rowley4, C. Ruiz

The heavy-ion radiative capture reaction 12C(16O,γ )28Si has been studied at three energies Ec.m. = 8.5, 8.8, and 9 MeV which are close to the Coulomb barrier. The weak radiative capture process has been identified by measuring the 28Si recoils in the highly selective 0◦ spectrometer DRAGON at TRIUMF (Vancouver). The coincident γ rays have been recorded in the associated BGO array. This has allowed a complete measurement of the γ spectrum and the relative strength of all decay pathways. An important part of the decay through quasibound states close to the particle threshold and the feeding of bound states with particular deformation have been identified for the first time. Comparisons with Monte Carlo simulations allowed the extraction of the full experimental radiative capture cross section. Our results suggest an important contribution of spins J π = 5− and 6+ in the entrance channel. The surprisingly large cross sections from 12 μb at Ec.m. = 8.5 MeV to 25 μb at Ec.m. = 9.0 MeV for the heavy-ion radiative capture process are discussed in terms of the interplay between statistical and structural aspects of the process.
1 :  IPHC - Institut Pluridisciplinaire Hubert Curien
2 :  GANIL - Grand Accélérateur National d'Ions Lourds
3 :  IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)
4 :  IPNO - Institut de Physique Nucléaire d'Orsay
Physique/Physique Nucléaire Expérimentale