  We propose a novel method for analysis of experimental data obtained at
relativistic nucleus-nucleus collisions. The method, based on the ideas of
Random Matrix Theory, is applied to detect systematic errors that occur at
measurements of momentum distributions of emitted particles. The unfolded
momentum distribution is well described by the Gaussian orthogonal ensemble of
random matrices, when the uncertainty in the momentum distribution is maximal.
The method is free from unwanted background contributions.
