Measurement of collectivity of collective flow in relativistic heavy-ion collisions using particle group correlations

Based on a particle groups correlation function, a new type of inferring co llectivity of collective flow is proposed in this paper. Using this method, the particle group correlations arising from collective flow are analyzed for collisions of 1.2A GeV Ar + BaI2 and 2.1A GeV Ne + NaF in the Bevalac s treamer chamber. The results have been compared with Monte Carlo simulation , which show that the collectivities are between 80 and 95 % for the experi mental events in collisions of Ar + BaI2, and between 75 and 95 % for the e xperimental events in collisions of Ne + NaF. [S0556-2813(98)01611-2].