Characteristics of alpha projectile fragments emission in interaction of nuclei with emulsion

摘要

The properties of the relativistic alpha fragments produced in interactionsof 84^Kr at around 1 A GeV in nuclear emulsion are investigated. Theexperimental results are compared with the similar results obtained fromvarious projectiles with emulsion interactions at different energies. Thetotal, partial nuclear cross-sections and production rates of alphafragmentation channels in relativistic nucleus-nucleus collisions and theirdependence on the mass number and initial energy of the incident projectilenucleus are investigated. The yields of multiple alpha fragments emitted fromthe interactions of projectile nuclei with the nuclei of light, medium andheavy target groups of emulsion-detector are discussed and they indicate thatthe projectile-breakup mechanism seems to be free from the target mass number.It is found that the multiplicity distributions of alpha fragments are welldescribed by the Koba-Nielsen-Olesen (KNO) scaling presentation. The meanmultiplicities of the freshly produced newly created charged secondaryparticles, normally known as shower and secondary particles associated withtarget in the events where the emission of alpha fragments were accompanied byheavy projectile fragments having Z value larger than 4 seem to be constant asthe alpha fragments multiplicity increases, and exhibit a behavior independentof the alpha fragments multiplicity.