Limiting fragmentation behavior of projectile helium (Z = 2) fragments in nucleus-nucleus interactions at 14.6AGeV

摘要

An analysis of projectile helium (Z = 2) fragments based on 855 minimum-bias inelastic events induced by 14.6AGeV~(28)Si beam in a nuclear emulsion is presented in order to test the hypothesis of limiting fragmentation. The projected angular distributions of projectile helium fragments have been fitted with Gaussian curves in individual helium reaction channels and also in different emulsion target events. Furthermore, average emission angle of projectile helium fragments has been studied in individual helium reaction channels with different emulsion target groups. On the basis of pseudo-rapidity distribution, an energy independent limiting fragmentation behavior of projectile helium fragments is also investigated in the fragmentation region.