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1 GANIL - Grand Accélérateur National d-Ions Lourds 2 IPNO - Institut de Physique Nucléaire d-Orsay 3 LPCC - Laboratoire de Physique Corpusculaire de Caen 4 CNAM Paris - Conservatoire National des Arts et Métiers - Paris 5 Université Laval 6 IPNL - Institut de Physique Nucléaire de Lyon 7 Università degli studi di Napoli Federico II 8 INFN, Sezione di Napoli - Istituto Nazionale di Fisica Nucleare, Sezione di Napoli 9 EAMEA - Ecole des Applications Militaires de l-Energie Atomique 10 H.Niewodniczanski Institute of Nuclear Physics 11 Omsk State University 12 INFN, Sezione di Catania - Istituto Nazionale di Fisica Nucleare, Sezione di Catania

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±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.

Keywords : sequential fission onset of multifragmentation incomplete fusion chronometer time scale low and intermediate energy multifragmentation threshold heavy-ion reactions three-fragment correlations

Autor: D. Gruyer - J.D. Frankland - E. Bonnet - A. Chbihi - G Ademard - M. Boisjoli - B Borderie - R. Bougault - E Galichet - J Gauthier



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