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.
The forward–backward multiplicity correlations among the charged particles produced in the interactions of 24 and 400 GeV protons and 50 and 340 GeV pions with emulsion nuclei are being investigated. The results of hadron–nucleus interactions have been compared with those of hadron–hadron interactions. The variations of average values in the forward–backward hemisphere with the multiplicity in the opposite hemisphere have been studied by dividing the data into different ηc-intervals also.
Some results on heavy-and shower-particle multiplicities produced in interactions of 340-GeV pions in nuclear emulsion are presented and compared with similar results in proton-nucleus interactions at different energies. Values of (A',) in a-A interactions are found to be less than its value in p A interactions at similar energies. This is understood in terms of additive quark model. The result on mean normalized multiplicity reveals that the values of R,, are almost constant in the forward direction for all values of (v(N,)) and R , , increases with ( v(Ng 1) in the intervals 1 . 2 < q P 2 . O a n d q I 1.2.
Characteristics of clusters of relativistic charged secondaries produced in 14.5A GeV/c Si-nucleus collisions are investigated by examining the behaviour of the rapidity gap distribution. The findings reveal that the maximum number of relativistic charged particles constituting a cluster is four. Further, the size of the cluster is observed to remain essentially independent of the mass of the struck nucleus. A comparison of the result of the present study with those reported earlier for hadron-hadron and hadron-nucleus collisions indicates that similar mechanisms may operate in the production of secondary particles in both hadronic and nuclear collisions at high energies.
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