Coulomb chronometry to probe the decay mechanism of hot nuclei

19 Nov 2015  ·  Gruyer Diego GANIL, Frankland J D. GANIL, Bonnet Eric GANIL, Chbihi A GANIL, Ademard G IPNO, Boisjoli M GANIL, Borderie B IPNO, Bougault R LPCC, Galichet E CNAM Paris, IPNO, Gauthier J IPNL, Guinet D IPNL, Lautesse P IPNL, Neindre N Le LPCC, Legouée E LPCC, Lombardo I INFN, Sezione di Napoli, Lopez O LPCC, Manduci L EAMEA, Marini P GANIL, Mazurek K LPCC, Nadtochy P. LPCC, Pârlog M LPCC, Rivet M. F. IPNO, Roy R. INFN, Sezione di Napoli, Rosato E INFN, Sezione di Napoli, Spadaccini G INFN, Sezione di Napoli, Verde G INFN, Sezione di Catania, IPNO, Vient E LPCC, Vigilante M INFN, Sezione di Napoli, Wieleczko J. P. GANIL ·

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$\pm$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. read more

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Nuclear Experiment