Channels of projectile fragmentation of¹⁶O nucleus in nuclear emulsion

Abstract

Experimental data are presented on the projectile fragments emitted from non-central collisions of 3.7 A GeV 16 O projectiles with nuclear emulsion. Charges of all projectile fragments are measured carefully and identified using δ-ray distributions. Each distribution is fitted by Gaussian shape and represented one of the possible charges of projectile fragments. Topology of 16 O fragmentation is reported and compared with that obtained at 60 A GeV. The multiplicity distributions for 16 O projectile fragments with charge 3Z7 are studied and it classified according to the size of the target nucleus. In this range of energy, the mechanism responsible for projectile fragmentation is independent on its energy. Experimental observations proved that there is high probability for production α-clusters than all other nuclear fragments. The production rate of α-clusters fragments due to 16 O fragmentations is studied at range of energies 2-200 A GeV. The dependence of α-clusters on target components (CNO and AgBr) is formulated. Experimental data indicates that α-cluster represents the main unit of the structure of atomic nucleus.

Secondary nuclei from $^{16}$O fragmentation at the LHC

“…1. As seen, the data [9] on the production of He and Li are described well by AAMCC with DW parametrization of nuclear density. The data on production of Be, B and N [9] are in a reasonable…”

“…Another indication in favour of -clustering in 16 O can be seen in Fig. 2, where the calculated probabilities of multiple production of -particles in interactions of 16 O with different energies in nuclear emulsion are presented along with data [9]. The probabilities of production of one, two and three of -particles at 3.7 GeV/nucl.…”

“…The composition of spectator matter in collisions of 16 O with 16 O and other nuclei was modelled by means of the Abrasion-Ablation Monte Carlo for Colliders (AAMCC) [8] model with two parameterisations of nuclear density distributions in 16 O without accounting for cluster effects. The probabilities and cross sections for the production of specific elements along with the probabilities to obtain one, two or three spectator -particles in 16 O-Em (AgBr+CNO) collisions were calculated and compared with data [9,10] to validate the model. The composition of spectator nuclei from 16 O- 16 O collisions at √ NN = 6.37 TeV the LHC as well as multiplicity distributions of neutrons and nucleons were calculated.…”

Angular Distribution and Transverse Momenta of Projectile Fragments of Oxygen Nucleus Collided with Emulsion at 3.7A GeV

“…Transverse momentum pT for the charged Pfs is related to the emission angle and magnitude of the charge [5] where There are two observed distributions, one is for low transverse momenta pT represents by symmetric Gauss distribution and the other is for high pT which described by exponential decay curve. Each distribution represents a specific mechanism responsible for production of projectile fragments at different temperatures.…”

“…Many experimental and theoretical efforts have been devoted to describing the reaction mechanism that is responsible or nuclear fragmentations [1][2][3][4]. In previous work [5] the charges of all possible channels of projectile fragmentation Pf, for 32 S and 16 O nuclei were studied. Now we investigate some of the experimental parameter that gives information on this process.…”