Fluctuations of the spatial pattern are investigated by analyzing 14.5 A GeV/c ²⁸Si-nucleus interactions on event-by-event basis. For this the nearest neighbor rapidity spacings are analyzed. The two entropy like quantities, S_q and {\Sigma }_q, estimated from the two moments of the rapidity gap distributions G_q and H_q, are observed to deviate significantly from 1. This would indicate the presence of erratic nature of event-by-event fluctuations in rapidity gap distributions. The variations of ln S_q and  ln \Sigma_q with q and their dependence on multiplicity of relativistic charged particles are investigated. A similar analysis is carried out for a Monte Carlo generated event sample using the event generator, Hijing 1.33. The results obtained for the simulated data are observed to compare well with the corresponding experimental values.

PACS numbers: 25.75.-q, 25.70.Pq, 24.60.Ky