Radial flow in ⁴⁰Ar+ ⁴⁵Sc reactions at E=35-115 MeV/nucleon

Collective radial flow of light fragments from ⁴⁰Ar+⁴⁵Sc reactions at beam energies between 35 and 115 MeV/nucleon has been investigated using the Michigan State University 4π Array. The mean transverse kinetic energy 〈E₁〉 of the different fragment types increases with event centrality and increases as a function of the incident beam energy. Comparison of our measured values of 〈E₁〉 shows agreement with predictions of Boltzmann-Uehling-Uhlenbeck model and WIX multifragmentation model calculations. The radial flow extracted from 〈E₁〉 accounts for approx mately half of the emitted particle's energy for the heavier fragments (Z≥4) at the highest beam energy studied.