PROMINENT TRANSVERSE FLOW OF CLUSTERS IN STOPPED AU(150-A-MEV)+AU REACTIONS

Stopped Au (150 A MeV) + Au collisions have been measured with the FOP I-Detector at GSI by imposing an upper limit on the ratio of the globa l longitudinal momentum to the collected charge within an event. The e jectiles, in particular those with Z > 3, have a rapidity close to mid -rapidity and exhibit angular distributions in the centre-of-mass stro ngly peaking around 90 degrees thus suggesting an enhancement of the f low in the transverse direction. Fits to the data and comparisons with QMD calculations indicate an averaged collective velocity in the tran sverse direction equal to 0.12 c. Significance of the determined veloc ity and temperature values is discussed.