Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2004-05-06
Nucl.Phys. A742 (2004) 337-347
Physics
Nuclear Physics
Nuclear Theory
13 pages, 7 figures, submitted to Nucl.Phys.A
Scientific paper
10.1016/j.nuclphysa.2004.07.001
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.
Colonna Maria
Fabbri Giorgio
Matera F.
Toro Massimo Di
Wolter Hermann H.
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