The low-PT region of secondary pions, the sea and valence quark distributions in the projectile and the target, and rapidity correlations among secondary pions are investigated in interactions of 50-GeV/c a-with nuclear emulsion placed in a strong magnetic field. The existence of a sharp peak in the region of PT2 10.12 (Gev/cI2 for positive and negative pions in the forward and backward hemispheres in the center-of-mass system is explained on the basis of resonance formation. The production of secondary pions is explained on the basis of the quark-antiquark-recombination model. We have used the valence and sea quark distributions in the pion for explaining the n+/a-ratio. We find an enhancement in the number of sea quarks with an increase in nuclear-target size. Single-particle and two-particle inclusive rapidity distributions have been studied. The rapidity-difference distributions and the normalized correlation function R have also been investigated. It is found that no positive correlations among secondary pions are evident at this primary energy.-STUDY OF LOW-PT SPECTRA, SEA AND VALENCE QUARK . . .
A model-independent method for determination of cluster size in the pionization region has been presented in nucleon-nuc!eon interactions at cosmic-ray energies (-10" eV). The maximum multiplicity of charged particles (pions) constituting a cluster IS found to be 4 and 3 at primary energies greater than 1 TeV and less than 1 TeV, respectively.
The various characteristics of rapidity of secondary particles in interactions at cosmic-ray energies (-10" eV) have been investigated. The features studied are the dependence of maximum-rapidity-gap value on primary energy and multiplicity, the rapidity-difference distribution, and the rapidity distribution of the secondary particles. The results have been compared with the predictions of the multiperipheral model.
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