الفهرس 
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Abstract
This thesis is concerned with the study of 28 Si-Em interactions at 14.6 A GeV incident energy. In a total scanned length of 121.77 meters, 962 inelastic events were collected. The resulting mean free path λ equal to 12.6 ± 0.5 cm corresponding to a reaction cross -section σ =1002 ± 40mb. This σ value is found to be in consistent with the calculated ones which are based on geometrical consideration.
All the fragments emitted within the forward narrow cone and going for a few centimeters without appreciable energy losses are considered as projectile fragments pf`s. The delta-ray counting method was used to identify the charge Z, of each of these pf`s. The fragmentation topology for 28Si induced interactions at 14.6 A GeV are presented and compared with those obtained for the interactions with nuclear emulsion 3.7 A GeV 28Si and 200 A GeV 32s. The experimental results for the percentages of the total projectile distruction events,TD, are noticed to be nearly similar at the three compared energies and satisfactorily agree with the corresponding calculate values according to a geometrical formula like the one predicted by Bradt-Peters for relativistic nucleus -nucleus collisions. The multiplicity and charge distribution of fragment with Z ≥ 6 are qualitatively described by a statistical perculation model for quasi - nucleon events where the size of the fragmenting system is well defined.
The multiplicity distributions of the total stripping charge per event Q, are studied for two incident 28Si energies( 14.6 and 3.7 AGeV)as well as for different impact parameters in the case of the present work.