Abstract
In Xe+Sn central collisions from 12 to 20 MeV/A measured with the INDRA 4$\pi$ 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.
Highlights
In central heavy-ion collisions at beam energies between 25 and 100 MeV/A, production of many nuclear fragments is observed
In 129Xe + nat Sn central collisions from 12 to 20 MeV/A measured with the INDRA 4 multidetector, the three-fragment exit channel occurs with a significant cross section
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
Summary
In central heavy-ion collisions at beam energies between 25 and 100 MeV/A, production of many nuclear fragments is observed. The fragment production is compatible with the simultaneous break-up of finite pieces of excited nuclear matter [1] This so-called “nuclear multifragmentation” is a fascinating process which has been widely studied by the INDRA collaboration, notably in 129Xe + nat Sn central collisions [2,3,4,5,6,7,8,9,10,11]. We determine the order and time scale of three fragment emission and show the evolution of the deexcitation process from hot sequential fission to multifragmentation
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