Coulomb chronometry to probe the decay mechanism of hot nuclei
Gruyer, Diego · Frankland, J D. · Bonnet, Eric · Chbihi, A · Ademard, G · Boisjoli, M · Borderie, B · Bougault, R · Galichet, E · Gauthier, J · Guinet, D · Lautesse, P · Neindre, N Le · Legouée, E · Lombardo, I · Lopez, O · Manduci, L · Marini, P · Mazurek, K · Nadtochy, P. · Pârlog, M · Rivet, M. F. · Roy, R. · Rosato, E · Spadaccini, G · Verde, G · Vient, E · Vigilante, M · Wieleczko, J. P.
الأصل · EN
In 129 Xe+ nat Sn central collisions from 8 to 25 MeV/A, the three-fragment exit channel occurs with a significant cross section. We show that these fragments arise from two successive binary splittings of a heavy composite system. The sequence of fragment production is determined. Strong Coulomb proximity effects are observed in the three-fragment final state. A comparison with Coulomb trajec-tory calculations shows that the time scale between the consecutive break-ups decreases with increasing bombarding energy, becoming quasi-simultaneous above excitation energy E * = 4.0±0.5 MeV/A. This transition from sequential to simultaneous break-up was interpreted as the signature of the onset of multifragmentation for the three-fragment exit channel in this system.
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