Collective flow in central Au-Au collisions at 150, 250, and 400A MeV

Radial collective flow and thermalization are studied in gold on gold colli sions at 150, 250, and 300 A MeV bombarding energies with a relativisticall y covariant formulation of a QMD code. We find that radial flow and "therma l" energies calculated for all the charged fragments agree reasonably with the experimental values. The experimental hardware filter at small angles u sed in the FOPI experiments at higher energies selects mainly the thermaliz ed particles. [S0556-2813(99)00603-2].