Collective Flow Phenomena of Protons and $\pi^{-}$ Mesons in Nucleus-Nucleus Collisions at a Momentum of $4.2\div 4.5$ GeV/$c$ per Nucleon

Abstract

The collective properties of protons and $\pi^{-}$ mesons in He-C, C-C, C-Ne, C-Cu and C-Ta collisions at a momentum of $4.2\div 4.5$ GeV/$c$ per nucleon ($E=3.4\div3.7$ GeV/nucleon) have been investigated. The data is obtained by SKM-200-GIBS and 2-m Propane Bubble Chamber of JINR. The directed (in-plane) protons and $\pi^{-}$ mesons have been observed in the above-mentioned interactions. In He-C, C-C and C-Ne interactions the directed flow of $\pi^{-}$ mesons is in the same direction as for protons, while in C-Cu and C-Ta collisions pions show antiflow behaviour