Collective flow in heavy ion reactions and the properties of excited nuclear matter

Details Collective flow in heavy ion reactions and the properties of excited nuclear matter Collective flow in heavy ion reactions and the properties of excited nuclear matter

1996-07-11

arxiv.org/abs/nucl-th/9607015v1

Physics

Nuclear Physics

Nuclear Theory

LaTeX, 12 pages, 8 low-resolution eps-figures, a high resolution PostScript version of the paper is available at http://www.

Scientific paper

Quantum Molecular Dynamics (QMD) calculations of central collisions between heavy nuclei are used to study fragment production and the creation of collective flow. It is shown that the final phase space distributions are compatible with the expectations from a thermally equilibrated source, which in addition exhibits a collective transverse expansion. However, the microscopic analyses of the transient states in the intermediate reaction stages show that the event shapes are more complex and that equilibrium is reached only in very special cases but not in event samples which cover a wide range of impact parameters as it is the case in experiments. The basic features of a new molecular dynamics model (UQMD) for heavy ion collisions from the Fermi energy regime up to the highest presently available energies are outlined.

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