Oscillations above the barrier in the fusion of 28Si + 28Si (CROSBI ID 218218)
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Podaci o odgovornosti
Montagnoli, G. ; Stefanini, A.M. ; Esbensen, H. ; Corradi, L. ; Courtin, S. ; Fioretto, E. ; Grebosz, J. ; Haas, F. ; Jia, H.M. ; Jiang, C.L. ; Mazzocco, M. ; Michelagnoli, C. ; Mijatovic, Tea ; Montanari, D. ; Parascandolo, C. ; Scarlassara, F. ; Strano, E. ; Szilner, Suzana ; Torresi, D.
engleski
Oscillations above the barrier in the fusion of 28Si + 28Si
Fusion cross sections of 28Si + 28Si have been measured in a range above the barrier with a very small energy step (Delta_Elab = 0.5 MeV). Regular oscillations have been observed, best evidenced in the first derivative of the energy-weighted excitation function. For the first time, quite different behaviors (the appearance of oscillations and the trend of sub-barrier cross sections) have been reproduced within the same theoretical frame, i.e., the coupled-channel model using the shallow M3Y+repulsion potential. The calculations suggest that channel couplings play an important role in the appearance of the oscillations, and that the simple relation between a peak in the derivative of the energy- weighted cross section and the height of a centrifugal barrier is lost, and so is the interpretation of the second derivative of the excitation function as a barrier distribution for this system, at energies above the Coulomb barrier.
Heavy-ion fusion; sub-barrier cross sections; coupled-channels model
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