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How does fusion hindrance show up in medium-light systems? The case of 48Ca + 48Ca

Abstract : The fusion excitation function of 48Ca + 48Ca has been measured above and well below the Coulomb barrier, thereby largely extending the energy range of a previous experiment down to very low cross sections. This system has a negative Q-value for compound nucleus formation. The fusion cross section decreases steadily below the barrier with no conspicuous change of slope below 300 μb. Coupled-channels calculations using a Woods–Saxon potential indicate that a large diffuseness parameter is needed to reproduce the sub-barrier cross sections. A close analogy with the case of 36S + 48Ca, with Q>0, is pointed out. The sign of the Q-value does not influence fusion cross sections down to the 300–600 nb level
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http://hal.in2p3.fr/in2p3-00410097
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Submitted on : Monday, August 17, 2009 - 2:13:26 PM
Last modification on : Saturday, June 20, 2020 - 4:18:05 PM

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A.M. Stefanini, G. Montagnoli, R. Silvestri, L. Corradi, S. Courtin, et al.. How does fusion hindrance show up in medium-light systems? The case of 48Ca + 48Ca. Physics Letters B, Elsevier, 2009, 679, pp.95-99. ⟨10.1016/j.physletb.2009.07.017⟩. ⟨in2p3-00410097⟩

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