Anisotropic Distribution of Final State Particles in High Energy Heavy Ion Collisions

The flow angles for the final state particles with five kind of mass number (A = 1, 2, 3, 4 and 5 - 8) are determined for 1.2 A GeV Au + Au collisions at the Bevalac by minimizing the azimuthal anisotropy in the center - of - mass coordinate systems where the z axis is rotated to various polar angles in the reaction plane. The study of the polar angle distributions for the final state particles with different mass in the systems with the z axis rotated to the flow angles indicates that the degree of concentration around the flow direction and the flow value increase with increasing mass number of the particles.