Nuclear Multifragmentation And The Onset of Radial Flow: A Study of Au + Au Collisions Between 40 and 100 MeV/A

Authors: F. Lavaud, E. Plagnol for the INDRA-ALADIN collaboration
Published: Proceedings of the International Nuclear Physics Conference (INPC 2001): Nuclear Physics And The 21st Century 30 Jul - 3 Aug 2001, Berkeley, California
    Edited by Eric Norman et al., AIP Conference Proceedings, Vol. 610 (New York, 2002)
Abstract: The influence of radial flow on nuclear multifragmentation is studied using Au+Au central collisions for incident energies between 40 and 100 MeV/A. Central collisions are selected via an impact parameter estimator defined by the transverse energy of light charged particles. At all energies, the fragment size distributions are studied using the Statistical Multifragmentation Model (SMM) in order to extract thermal excitation energies. The excess kinetic energies are analyzed via the hypothesis of a radial, self­similar, but non­isotropic flow. At the lowest energy, this flow is small with respect to the thermal energy whereas, at 100 MeV/A thermal and radial energies are of the same order. The nature and origin of the radial flow is discussed. A comparison with the predictions of the Quantum Molecular Dynamics code is presented.
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