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Physical Review C 75 (2007) 034612
Transition from participant to spectator fragmentation in Au+Au reactions between 60A and 150A MeV
K. Zbiri1, A. Lefèvre, Jörg Aichelin1, J. Lukasik, W. Reisdorf, F. Gulminelli2, U. Lynen, W.F.J. Müller, H. Orth, C. Schwarz, C. Sfienti, W. Trautmann, K. Turzó, B. Zwieglinski3, G. Auger4, J.L. Charvet5, A. Chbihi3, R. Dayras, D. Durand2, J.D. Frankland3, R. Legrain5, N. Le Neindre, O. Lopez2, L. Nalpas, M. Parlog3, E. Plagnol4, M. F. Rivet, E. Rosato, E. Vient2, M. Vigilante, C. Volant5, J.P. Wieleczko3
ALADIN, INDRA Collaboration(s)

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.
1 :  SUBATECH - Laboratoire SUBATECH Nantes
2 :  LPCC - Laboratoire de Physique Corpusculaire de Caen
3 :  GANIL - Grand Accélérateur National d'Ions Lourds
4 :  APC - UMR 7164 - AstroParticule et Cosmologie
5 :  DAPNIA - Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée
Physique théorique
APC - Cosmologie et gravitation
Dynamique et thermodynamique nucléaire
Physique/Physique Nucléaire Théorique
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