Features of the Forward-Backward Particles in the Collisions of Carbon with Nuclear Emulsion at High Energy

Abstract

Experimental data on relativistic (shower) and fast (grey) hadrons emitted in the forward and backward hemispheres (θ<90°, θ ≥90°),(FHS,BHS), in the collision of ¹²C beam with emulsion nuclei at 4.5 AGeV/c  are presented and analyzed. The correlations between multiplicities of shower particles are also investigated. The mean values of the multiplicities of the produced forward particles are strongly dependent on the projectile mass number, A_p, and its energy while those of the backward ones are nearly independent of A_p. Finally, the ratio (N_S^F / N_S^E) is found to increase with increasing the projectile mass and decrease rapidly with increasing the target size (N_h-value), while (N_S^F / N_S^E) seems to exhibit a limited behavior in the region of N_h >7.

Keywords: Forward hemisphere; Backward hemisphere; Nuclear emulsion; Collisions at high energy.

PACS: 25.75.-q