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arXiv · 1309.7779

Coulomb chronometry to probe the decay mechanism of hot nuclei

Diego Gruyer·J D. Frankland·Eric Bonnet·A Chbihi·G Ademard·M Boisjoli·B Borderie·R Bougault·E Galichet·J Gauthier·D Guinet·P Lautesse·N Le Neindre·E Legouée·I Lombardo·O Lopez·L Manduci·P Marini·K Mazurek·P. Nadtochy·M Pârlog·M. F. Rivet·R. Roy·E Rosato·G Spadaccini·G Verde·E Vient·M Vigilante·J. P. Wieleczko
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Abstract

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.

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Diego Gruyer, J D. Frankland, Eric Bonnet, A Chbihi, G Ademard, M Boisjoli, B Borderie, R Bougault, E Galichet, J Gauthier, D Guinet, P Lautesse, N Le Neindre, E Legouée, I Lombardo, O Lopez, L Manduci, P Marini, K Mazurek, P. Nadtochy, M Pârlog, M. F. Rivet, R. Roy, E Rosato, G Spadaccini, G Verde, E Vient, M Vigilante, J. P. Wieleczko. 2013-09-30. Coulomb chronometry to probe the decay mechanism of hot nuclei. https://doi.org/10.1103/physrevc.92.064606

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