A systematic investigation of the longitudinal-velocity distribution of projectile-like residues produced in the reactions U (1 A GeV) + Ti and U (1 A GeV) + Pb has been performed with the high-resolution magnetic spectrometer FRS at GSI. With increasing mass loss, the velocities first decrease, then level off, and finally increase again. Light fragments are even faster on the average than the projectiles. This apparent re-acceleration is interpreted as the response of the spectator to the participant blast and can be exploited as a new tool to investigate the equation of state of nuclear matter.
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