FLOW EFFECTS IN BI+PB COLLISIONS AT 1 GEV U

We report particle-exclusive measurements of triple-differential cross sections for positive pions, nucleons and light nuclear fragments in multiplicity-selected collisions of 1 GeV/u Bi-209+Pb-208. The depende nce upon the azimuthal angle with respect to the reaction plane is stu died as a function of the particle rapidity and transverse momentum. F low and squeeze-out are clearly established. For the baryonic componen t both effects increase with increasing mass of the particle. The meso n flow is anticorrelated to the baryon flow.