Sequential fissions of heavy nuclear systems

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.

6 pages, 5 figures, contribution to conference proceedings of the Fifth International Workshop on Nuclear fission and Fission-Product Spectroscopy

References in corpus (8)

• Nuclear multifragmentation and phase transition for hot nuclei
• Characteristics of the fragments produced in central collisions of 129Xe+ natSn from 32 to 50 AMeV
• Evidence for Spinodal Decomposition in Nuclear Multifragmentation
• Model-independent tracking of criticality signals in nuclear multifragmentation data
• Multifragmentation of very heavy nuclear systems (III): fragment velocity correlations and event topology at freeze-out
• Fragment properties of fragmenting heavy nuclei produced in central and semi-peripheral collisions
• New isospin e ffects in central heavy-ion collisions at Fermi energies
• Yield scaling, size hierarchy and fluctuations of observables in fragmentation of excited heavy nuclei