Abstract
The multiplicity distributions of shower, grey, and black particles produced in interactions of He-4, C-12, O-16, Ne-22, and Si-28 with emulsion (Em) at 4.1-4.5AGeV/c beam energies, and their dependence on target groups (H, CNO, and AgBr) is presented and has been reproduced by multisource thermal model. The multiplicity and the angular distributions of the three types of particles have been investigated. The experimental results are compared with the corresponding ones from the model. We found that the experimental data agrees with theoretical calculations using multisource thermal model.