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20 April 2024

» arxiv » 1505.1952

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Oscillations above the barrier in the fusion of 28Si + 28Si
G. Montagnoli ; A. M. Stefanini ; H. Esbensen ; L. Corradi ; S. Courtin ; E. Fioretto ; J. Grebosz ; F. Haas ; H. M. Jia ; C. L. Jiang ; M. Mazzocco ; C. Michelagnoli ; T. Mijatovic ; D. Montanari ; C. Parascandolo ; F. Scarlassara ; E. Strano ; S. Szilner ; D. Torresi ;
Date:	8 May 2015
Abstract:	Fusion cross sections of 28Si + 28Si have been measured in a range above the barrier with a very small energy step (DeltaElab = 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 di?erent 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.
Source:	arXiv, 1505.1952
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