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Oscillations above the barrier in the fusion of 28Si + 28Si

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.; Mijatović, Tea; Montanari, D.; Parascandolo, C.; Scarlassara, F.; Strano, E.; Szilner, Suzana; Torresi, D. (2015) Oscillations above the barrier in the fusion of 28Si + 28Si. Physics Letters B, 746 . pp. 300-305. ISSN 0370-2693

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Abstract

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.

Item Type: Article
Uncontrolled Keywords: Heavy-ion fusion; sub-barrier cross sections; coupled-channels model
Subjects: NATURAL SCIENCES > Physics
Divisions: Division of Experimental Physics
Projects:
Project titleProject leaderProject codeProject type
Eksperimentalno istraživanje atomske jezgre: struktura i reakcije-Suzana Szilner098-1191005-2890MZOS
Depositing User: Tea Mijatović
Date Deposited: 11 Jul 2016 11:09
Last Modified: 11 Jul 2016 11:09
URI: http://fulir.irb.hr/id/eprint/2918
DOI: 10.1016/j.physletb.2015.05.021

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