SOME FEATURES OF INELASTIC INTERACTIONS OF ²⁸Si AND ¹²C IONS IN NUCLEAR EMULSION AT 4.5A GeV/c

Abstract

Multiplicity distributions of various types of tracks produced in inelastic interactions of 28 Si and 12 C at 4.5A GeV/c with nuclear emulsion nuclei have been investigated. The correlations of the type <Ni(Nj)> where Ni, Nj=Ng, Nb, Nh or Ns with i≠j have been studied and compared with the results from p-Em interactions at the same momentum per nucleon. Some saturation effects in the values of <Nb> with Ng are observed. Furthermore, some of these correlations show almost similar dependence in nucleus-nucleus and proton-nucleus interactions at same per particle momenta. The values of <Ns> have been obtained by subtracting the contribution of Z=1 fragments to the observed showers. The dependence of <Ns> so obtained on the number of interacting projectile nucleons shows that the nucleus-nucleus collisions at these energies can be interpreted in terms of multiple N-N collisions.

Systematic Study Multiplicity Production Nucleus – Nucleus Collisions at 4.5 a GeV/c

“…From this figure, one can see that the Nb multiplicity distribution in 28 Si with emulsion is almost similar to that in 24 Mg with emulsion interactions, which indicate that the target-associated particles are characterized by a weak dependence on the projectile mass number Ap. This result is consistent with [10,11]. The Ns and Ng multiplicity distributions become broader with the increase of Ap.…”

Some Important Features of Relativistic Charged Particles Produced in <sup>32</sup>S-Emulsion Interactions at 200 AGeV/c

“…It may easily be seen from the figure that prominent peaks are observed at very small angles, which may be attributed to the well known phenomenon of proton stripping, superimposed over the uniform distributions. The detailed discussion regarding the contributions of singly charged projectile fragments and truly created relativistic charged secondaries may be found elsewhere [19]. We may also get an indication of limiting fragmentation hypothesis.…”

Study of multiplicity correlations in nucleus–nucleus interactions at high energy

“…5,6 Multiplicity correlations for the types of charged particles have been widely studied using different projectiles and targets. 24 Multiplicity distributions for the emitted particles have been found to obey the Koba-Nielsen-Olesen (KNO) type of scaling law. [25][26][27] Multiplicity correlations and KNO scaling in pion-nucleus interactions have been investigated by Tufail et al 28 The properties of the new parameter named compound multiplicity, which is the sum of both relativistic shower and grey particles per interaction, may play an important role in revealing the mechanism of the nucleus-nucleus interaction and in understanding the reaction dynamics in high-energy nuclear interaction.…”

“…35,36 Some important characteristics, such as the compound multiplicity distribution and the correlations between the compound multiplicity and different charged secondaries, produced in totally disintegrated events for the interactions of 16 O and 28 Si nuclei with emulsion heavy target nuclei, have been studied in an earlier publication. 37 Also, Abd-Allah et al 38 the correlations between different multiplicities in 7 Li-Em and 24 Mg-Em collisions at 3A GeV/c and 4.5A GeV/c, respectively. Despite the above mentioned studies on the multiplicity correlations, there is still a lack of experimental investigations in nucleus-nucleus collisions compared with the results of the calculations, performed according to the MCEM.…”