Transition from participant to spectator fragmentation in Au+Au reactions between 60A and 150A MeV

Abstract : Using the quantum molecular dynamics approach, we analyze the results of the recent INDRA Au+Au experiments at GSI in the energy range between 60 AMeV and 150 AMeV. It turns out that in this energy region the transition toward a participant-spectator scenario takes place. The large Au+Au system displays in the simulations as in the experiment simultaneously dynamical and statistical behavior which we analyze in detail: The composition of fragments close to midrapidity follows statistical laws and the system shows bi-modality, i.e. a sudden transition between different fragmentation pattern as a function of the centrality as expected for a phase transition. The fragment spectra at small and large rapidities, on the other hand, are determined by dynamics and the system as a whole does not come to equilibrium, an observation which is confirmed by FOPI experiments for the same system.
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Contributor : Michel Lion <>
Submitted on : Monday, July 10, 2006 - 10:49:00 AM
Last modification on : Friday, May 10, 2019 - 1:54:18 PM

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K. Zbiri, A. Le Fevre, Jörg Aichelin, J. Lukasik, W. Reisdorf, et al.. Transition from participant to spectator fragmentation in Au+Au reactions between 60A and 150A MeV. Physical Review C, American Physical Society, 2007, 75, pp.034612. ⟨10.1103/PhysRevC.75.034612⟩. ⟨in2p3-00084674⟩

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