Transition from participant to spectator fragmentation in Au+Au reaction between 60 AMeV and 150 AMeV

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.

arXiv commentpublished version

References in corpus (17)

• Modelling the many-body dynamics of heavy ion collisions: Present status and future perspective
• Universality of Spectator Fragmentation at Relativistic Bombarding Energies
• Antisymmetrized molecular dynamics of wave packets with stochastic incorporation of Vlasov equation
• Systematics of Stopping and Flow in Au+Au Collisions
• Directed and elliptic flow in Au + Au at intermediate energies
• Compatibility of localized wave packets and unrestricted single particle dynamics for cluster formation in nuclear collisions
• Multifragmentation in Xe(50A MeV)+Sn Confrontation of theory and data
• Bimodality: a possible experimental signature of the liquid-gas phase transition of nuclear matter
• Model-independent tracking of criticality signals in nuclear multifragmentation data
• First order phase transitions: equivalence between bimodalities and the Yang-Lee theorem
• Statistical Multifragmentation of Non-Spherical Expanding Sources in Central Heavy-Ion Collisions
• The importance of initial-final state correlations for the formation of fragments in heavy ion collisions
• Fragmentation in Peripheral Heavy-Ion Collisions: from Neck Emission to Spectator Decays
• Quantum Fluctuation Effects on Nuclear Fragment Formation
• Equilibrium under flow
• On the origin of the radial flow in low energy heavy ion reactions
• Transverse flow of nuclear matter in collisions of heavy nuclei at intermediate energies

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• Cluster and hyper-cluster production in relativistic heavy-ion collisions within the Parton-Hadron-Quantum-Molecular-Dynamics approach
• Thermal and Chemical Freeze-out in Spectator Fragmentation
• FRIGA, A New Approach To Identify Isotopes and Hyper-nuclei In N-Body Transport Models
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