Sequential fissions of heavy nuclear systems
1 GANIL, CEA-DSM/CNRS-IN2P3, Bvd. Henri Becquerel, 14076 Caen Cedex, France
2 Département de physique, de génie physique et d'optique, Université Laval, Québec, G1V 0A6 Canada
3 École des Applications Militaires de l'énergie Atomique, BP. 19, 50115 Cherbourg, France
4 The Niewodniczański Institute of Nuclear Physics – PAN, 31-342 Kraków, Poland
5 Omsk State University, Mira prospekt 55-A, Omsk 644077, Russia
a e-mail: email@example.com
Published online: 13 December 2013
In 129Xe + natSn central collisions from 12 to 20 MeV/A measured with the INDRA 4π multidetector, the three-fragment exit channel occurs with a significant cross section. In this contribution, we show that these fragments arise from two successive binary splittings of a heavy composite system. Strong Coulomb proximity effects are observed in the three-fragment final state. By comparison with Coulomb trajectory calculations, we show that the time scale between the consecutive break-ups decreases with increasing bombarding energy, becoming compatible with quasi-simultaneous multifragmentation above 18 MeV/A.
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