Determination of The Reaction Plane and Collective Flow In Nucleus-Nucleus Interactions at 4.5 A GeV/c

Abstract

Nuclear emulsions are used to investigate spallations produced by 4.5 A GeV/c ²⁴Mg and ²⁸Si nuclei. The integral multiplicity distribution of disintegrated particles from target nuclei is used to separate the inelastic interactions with the free hydrogen (H), the light (CNO), and the heavy (AgBr) nuclei. Angle of flow, transverse momentum, angular characteristics, and azimuthal alignment data are analyzed for the presence collective fragments in ²⁴Mg+Ag(Br) and ²⁸Si+Ag(Br) collisions with emulsion nuclei at 4.5 A GeV/c. The determination of the reaction plane is powerful tool for investigating the nucleus-nucleus interactions. The analysis of the projection of the transverse momentum, angular characteristics, azimuthal alignment and range onto the reaction plane shows a significant side splash of the target fragment.