Fragmentation path of excited nuclear systems

Abstract

We perform a study of the fragmentation path of excited nuclear sources, within the framework of a stochastic mean-field approach. We consider the reaction ${}^{129}$Xe + ${}^{119}$Sn at two beam energies: 32 and 50 MeV/A, for central collisions. It is observed that, after the compression phase the system expands towards a dilute configuration from which it may recontract or evolve into a bubble-like structure. Then fragments are formed through the development of volume and/or surface instabilities. The two possibilities co-exist at 32 MeV/A, leading to quite different fragment partitions, while at 50 MeV/A the hollow configuration is observed in all events. Large variances are recovered in a way fully consistent with the presence of spinodal decomposition remnants. Kinematical properties of fragments are discussed and suggested as observables very sensitive to the dominant fragment production mechanism. A larger radial collective flow is observed at 50 MeV/A, in agreement with experiments.

13 pages, 7 figures, submitted to Nucl.Phys.A

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• Isospin Distillation with Radial Flow: a Test of the Nuclear Symmetry Energy
• Multifragmentation of very heavy nuclear systems (III): fragment velocity correlations and event topology at freeze-out
• Fragmentation paths in dynamical models
• Break-up mechanisms in heavy ion collisions at low energies
• Comparison of dynamical multifragmentation models
• Relevance of equilibrium in multifragmentation
• Investigation of collective radial expansion and stopping in heavy ion collisions at Fermi energies
• Isospin effects and symmetry energy studies with INDRA
• Freeze-out volume in multifragmentation - dynamical simulations
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• Fragment Formation in Central Heavy Ion Collisions at Relativistic Energies
• Break-up fragment topology in statistical multifragmentation models