Comparative study between the experimental data of 4.1(4.5) A GeV/c 22Ne(28Si) collisions in emulsions with theoretical calculations

The multiplicity and angular data of the collisions of 4.1 (4.5) A GeV/c 22Ne (28Si) with emulsion nuclei which was obtained in the Laboratory of High Energy Physics (LHEP) at Cairo University has been used in the present analysis. Two theoretical models have been considered to calculate the multiplicity and angular characteristics of particles emitted in the interactions of 22Ne(28Si) with emulsion nuclei. The first model is the modified cascade evaporation model, which implies superposition of nucleon-nucleon interactions. The main modification in the present calculations is the introduction of particle formation time as an adjustable parameter. The other assumptions include considering the two nuclei as clouds of Fermi gas and nucleons should obey the Pauli exclusion principle in the process of interaction. The second model is the modified Fritiof model, which utilizes the Regge theory for the description of the cascading process. Each interaction of the incident hadron with nucleon of a target nucleus is assumed to initiate a cascade of Reggon exchanges. The comparison has shown that both models agree, within errors, with experimental data in the global features such as the mean multiplicities of the different particles. However, there is some difference between them in predicting the average values of the emitted particles. The study will be extended in future to include other experimental data and theoretical models