Fragmentation of²⁸Si nuclei in nuclear emulsion

Abstract

Topology of 28 Si fragmentation at 14.6 A GeV in emulsion nuclei is given. In all events, the charge of each projectile fragment is measured. We report the measurements on total and some partial reactions cross sections of 28 Si interactions. The data for Z 6 can be qualitatively described by a statistical percolation model. The results are discussed and compared with those obtained from 28 Si at 3.7 A GeV and 32 S at 200 A GeV.

Variation of multiplicities of the secondary charged particles on the geometry of collision

“…From these plots it is found that, for both the systems, the mean number of shower particles decreases exponentially with the increase of Q pf showing strong correlation between <N s > and Q pf . Similar results have been reported by M El-Nadi et al [13] for 28 Si-Em interactions at 14.6A GeV.…”

“…Similar linear negative correlation have been reported by M.I Adomovich [14] et al and Fu Hu Liu [15] for 16 O-Em and 28 Si-Em interaction respectively at 3.7A GeV and also by Keasnov et al [8] for 84 Kr-Em interactions at 0.95 A GeV. M EI Nadi et al have also reported a decrease in the mean number of fast protons with the increase of Q pf for 28 Si-Em interaction at 14.6A GeV [13]. The dependence of <N b > on Q pf.…”

Channels of projectile fragmentation of16O nucleus in nuclear emulsion

“…Clustering is a generic phenomenon, which can appear in the homogeneous matter when the density decreases. The importance of the phenomenon of α-clusters was very early [19] because it may be apply for lowdensity nuclear matter [20], and light nuclei [21]. It was considered as the atomic nucleus as a collection of αclusters and both theoretical and experimental efforts were directed to study the clustering phenomena in nuclei [21][22][23][24].…”

“…They were checked and rechecked by scanning the track up and downstream from its production point. PFs refer to the spectator nucleons of the projectile with velocity ≈0.97c emitted within a fragmentation forward cone q ( ) c [15]. In this study they are singly-charged fragments with Z=1 or multiply charged fragments with Z2.…”

“…The PFs of charge Z2 were determined and identified by measuring the grain density, gap density and by δ-rays counting. The methods of counting have been described in [15]. A charged particle while passing through a material medium interacts with it as atomic interactions.…”