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Fusion of 40Ca + 96Zr revisited: transfer couplings and hindrance far below the barrier

Stefanini, A. M.; Montagnoli, G.; Esbensen, H.; Corradi, L.; Courtin, S.; Fioretto, E.; Goasduff, A.; Grebosz, J.; Haas, F.; Mazzocco, M.; Michelagnoli, C.; Mijatović, Tea; Montanari, D.; Pasqualato, G.; Parascandolo, C.; Scarlassara, F.; Strano, E.; Szilner, Suzana; Torresi, D. (2014) Fusion of 40Ca + 96Zr revisited: transfer couplings and hindrance far below the barrier. Physics Letters B, 728 . pp. 639-644. ISSN 0370-2693

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The sub-barrier fusion excitation function of 40Ca+96Zr has been measured down to cross sections 2.4micro b, i.e. two orders of magnitude smaller than obtained in a previous experiment, where the sub-barrier fusion of this system was found to be greatly enhanced with respect to 40Ca + 90Zr, and the need of coupling to transfer channels was suggested relying on coupled-channels calculations. The purpose of this work has been to investigate the behavior of 40Ca + 96Zr fusion far below the barrier, thereby disentangling the elusive interplay of effects due to inelastic couplings, transfer couplings and, possibly, the appearance of the fusion hindrance. The smooth trend of the excitation function has been found to continue, and the logarithmic slope increases very slowly. No indication of hindrance shows up, and a comparison with 48Ca + 96Zr is illuminating in this respect. A new CC analysis of the complete excitation function has been performed, including explicitly one- and two-nucleon Q >0 transfer channels. Such transfer couplings bring significant cross section enhancements, even at the level of a few micro b. Locating the hindrance threshold, if any, in 40Ca + 96Zr would require challenging measurements of cross sections in the sub-micro b range.

Item Type: Article
Uncontrolled Keywords: fusion excitation function; fusion hindrance
Subjects: NATURAL SCIENCES > Physics
Divisions: Division of Experimental Physics
Project titleProject leaderProject codeProject type
Fizika teških ionaZoran Basrak098-1191005-2879MZOS
Eksperimentalno istraživanje atomske jezgre: struktura i reakcijeSuzana Szilner098-1191005-2890MZOS
Depositing User: Tea Mijatović
Date Deposited: 28 Jul 2016 12:47
DOI: 10.1016/j.physletb.2013.12.048

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