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Transfer couplings and hindrance far below the barrier for 40Ca + 96Zr

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; Toniolo, N.; Torresi, D. (2015) Transfer couplings and hindrance far below the barrier for 40Ca + 96Zr. In: Simenel, C.; Gomes, P.R.S.; Hinde, D.J.; Madhavan, N.; Navin, A.; Rehm, K.E., (eds.) VI International Conference FUSION14. .

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The sub-barrier fusion excitation function of 40Ca + 96Zr has been measured down to cross sections 2.4μb, i.e. two orders of magnitude smaller than obtained in the 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. The purpose of this work was to investigate the behavior of 40Ca + 96Zr fusion far below the barrier. 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 very useful 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 μb. Locating the hindrance threshold, if any, in 40Ca + 96Zr would require challenging measurements of cross sections in the sub-μb range.

Item Type: Conference or workshop item published in conference proceedings (UNSPECIFIED)
Uncontrolled Keywords: fusion excitation function ; coupling effects ; fusion hindrance
Subjects: NATURAL SCIENCES > Physics
Divisions: Division of Experimental Physics
Project titleProject leaderProject codeProject type
Eksperimentalno istraživanje atomske jezgre: struktura i reakcije-Suzana Szilner098-1191005-2890MZOS
Depositing User: Suzana Szilner
Date Deposited: 22 Aug 2018 14:06
DOI: 10.1051/epjconf/20158600056

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