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Reaction mechanisms leading to 3-body exit channels in central collisions of 129Xe+ natSn at 12 MeV/u

Abstract : We attempt to ascertain whether well-known sub-Fermi energy reaction mechanisms (fusion-fission, quasifission, deep-inelastic reactions) can explain the cross-sections and other characteristics recently observed for 3-fragment exit channels of central 129Xe+ natSn collisions from 8 to 25 MeV/u measured with INDRA. In a first step, we have simulated deep-inelastic and capture (fusion-fission and/or quasifission) reactions at 12 MeV/u using the Deep Inelastic Transfers model coupled with GEMINI++, which we compare with data using a detailed software simulation of the INDRA array. Although minimum-bias measured and simulated reaction cross-sections are in good agreement, the cross-sections for 3-fragment exit channels are largely underestimated by the simulation. Moreover, 90% of simulated 3-body events are associated with mid-peripheral deep-inelastic collisions, whereas the measured coincident light charged particle yields are consistent with central collisions leading to fusion or quasifission. However the observed 3-body yield seems beyond the reach of standard statistical decay of the primary (quasi)fission fragments.
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John Frankland, Diego Gruyer, Eric Bonnet, A. Chbihi. Reaction mechanisms leading to 3-body exit channels in central collisions of 129Xe+ natSn at 12 MeV/u. International Workshop on Mult facets of EoS and Clustering (IWM-EC) 2016, May 2016, Caen, France. ⟨10.1393/ncc/i2016-16382-x⟩. ⟨in2p3-01382794⟩



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