Centrality dependence of total disintegration of target nuclei in high energy nucleus-nucleus interactions

摘要

A study of centrality dependence of target fragmentation and multiparticle production has been carried out in O-16-AgBr, Ne-22-AgBr, and Si-28-AgBr interactions at 4.1-4.5 AGeV/c for the total disintegrated (TD) events. Average multiplicity of black particles increases linearly with decreasing centrality while average multiplicity of grey and shower particles decreases with decreasing centrality for the TD events. The decrease of average multiplicity of grey particles is linear; on the other hand, in the case of shower particles, the increase is nonlinear. With the increase of the mass of the projectile beam, the average multiplicity of black particles decreases and the average multiplicity of grey particles increases for the TD events. This observation has been explained on the basis of the fireball model; however, in the case of shower particles, average multiplicity increases with increase of projectile mass.