Characteristics of the interactions of C-12, Ne-22 and Si-28 with emulsion nuclei accompanied with relativistic hadron in the backward hemisphere at Dubna energy

A detailed study of the characteristics of the interactions accompanied by relativistic hadrons in the backward hemisphere in the collisions of C-12, Ne-22 and Si-28 projectiles with emulsion nuclei at incident momentum in the range (4.1-4.5)A GeV/c has been carried out. For this purpose, random samples of 819, 3812 and 1209 events in case of C-12, Ne-22 and Si-28 interactions are analyzed, respectively. The behavior of the shower particle multiplicities and the pseudo-rapidity distributions for the different interactions is investigated in terms of the number of emitted shower particles in the backward hemisphere n(s)(b). The pseudorapidity distribution of the shower particles from the interactions accompanied by the emission of backward relativistic hadrons are found to be satisfactorily fitted by a single Gaussian distribution, while it is fitted by two Gaussian distributions when the interactions are not accompanied by backward relativistic hadron. This reflects the fact that there are two different sources creating the shower particles for n(s)(b) = 0 events. Also, the dispersion of the pseudorapidity distributions is independent of the number of the backward relativistic hadrons n,b. However, the average pseudorapidity decreases with the increase of the number of backward relativistic hadrons. The dependence of the average number of the shower particles produced in the backward and forward hemispheres on the projectile mass number and the impact parameter is also presented. The results yield quite interesting information regarding the mechanism of production of such backward relativistic hadrons in heavy ions interactions.