RADIAL FLOW IN AR-40-45 REACTIONS AT E=35-115 MEV(SC)NUCLEON/

Collective radial flow of light fragments from Ar-40+Sc-45 reactions a t beam energies between 35 and 115 MeV/nucleon has been investigated u sing the Michigan State University 4 pi Array. The mean transverse kin etic energy [E(t)] of the different fragment types increases with even t centrality and increases as a function of the incident beam energy. Comparison of our measured values of [E(t)] shows agreement with predi ctions of Boltzmann-Uehling-Uhlenbeck model and WIX multifragmentation model calculations. The radial flow extracted from [E(t)] accounts fo r approximately half of the emitted particle's energy for the heavier fragments (Z greater than or equal to 4) at the highest beam energy st udied.