Abstract

The energy, multiplicity, and mass dependences of the exclusive observable ''flow'' for heavy-ion reactions are studied in a model which includes mean-field but lacks compression effects. The energy and multiplicity dependences of recently published Plastic-Ball data are qualitatively reproduced but the mass-number dependence is not. This as well as the comparison with other models at present favors viscous hydrodynamics with an ideal-gas equation of state and a closely related microscopic reaction mechanism as candidates for yielding a ''flow'' compatible with the Plastic-Ball analysis.

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