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

Abstract : The sub-barrier fusion excitation function of Ca-40 + Zr-96 has been measured down to cross sections similar or equal to 2.4 mu b, 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 Ca-40 + Zr-90, and the need of coupling to transfer channels was suggested. The purpose of this work was to investigate the behavior of Ca-40 + Zr-96 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 Ca-48 + Zr-96 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 mu b. Locating the hindrance threshold, if any, in Ca-40 + Zr-96 would require challenging measurements of cross sections in the sub-mu b range.
Keywords : FUSION
Type de document :
Communication dans un congrès
VI INTERNATIONAL CONFERENCE FUSION14, Feb 2014, New Delhi, India. 86, pp.00056, 2015, EPJ Web of Conferences. 〈10.1051/epjconf/20158600056〉
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Contributeur : Emilie Bonnardel <>
Soumis le : mercredi 6 mai 2015 - 11:03:27
Dernière modification le : samedi 13 janvier 2018 - 01:04:47

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M. Stefanini A., G. Montagnoli, H. Esbensen, L. Corradi, S. Courtin, et al.. Transfer couplings and hindrance far below the barrier for Ca-40+Zr-96. VI INTERNATIONAL CONFERENCE FUSION14, Feb 2014, New Delhi, India. 86, pp.00056, 2015, EPJ Web of Conferences. 〈10.1051/epjconf/20158600056〉. 〈in2p3-01149038〉

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