Fragment flow in Au + Au collisions.

Exclusive measurements have been made of Au+Au reactions with beam energies ranging from 0.25A to 1.15A GeV. We present measurements of directed collective flow averaged over all light fragments with masses up to alphas, as veil as separate measurements for protons, deuterons, tritons, He-3, He-4, acid Li. The results show a strong increase of the directed how with fragment mass at all energies measured. Experimental results are compared with a quantum molecular dynamics model. We find that neither the ''soft'' nor the ''hard'' equation of state can describe the data over the entire range of beam energies.