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

TL;DR

This study investigates the emission characteristics of alpha projectile fragments in relativistic nucleus-nucleus collisions, analyzing their production, distribution, and dependence on projectile and target properties, and compares results across different energies and projectiles.

Contribution

It provides new insights into alpha fragment emission mechanisms and their independence from target mass, with detailed analysis of multiplicity distributions and cross-sections in relativistic nuclear interactions.

Findings

Alpha fragment multiplicity distributions follow KNO scaling.

Projectile-breakup mechanism appears target-mass independent.

Mean secondary particle multiplicities are constant with alpha multiplicity.

Abstract

The properties of the relativistic alpha fragments produced in interactions of 84^Kr at around 1 A GeV in nuclear emulsion are investigated. The experimental results are compared with the similar results obtained from various projectiles with emulsion interactions at different energies. The total, partial nuclear cross-sections and production rates of alpha fragmentation channels in relativistic nucleus-nucleus collisions and their dependence on the mass number and initial energy of the incident projectile nucleus are investigated. The yields of multiple alpha fragments emitted from the interactions of projectile nuclei with the nuclei of light, medium and heavy target groups of emulsion-detector are discussed and they indicate that the projectile-breakup mechanism seems to be free from the target mass number. It is found that the multiplicity distributions of alpha fragments are well described by the Koba-Nielsen-Olesen (KNO) scaling presentation. The mean multiplicities of the freshly produced newly created charged secondary particles, normally known as shower and secondary particles associated with target in the events where the emission of alpha fragments were accompanied by heavy projectile fragments having Z value larger than 4 seem to be constant as the alpha fragments multiplicity increases, and exhibit a behavior independent of the alpha fragments multiplicity.