2-DIMENSIONAL AND 3-DIMENSIONAL ANALYSIS OF BOSE-EINSTEIN CORRELATIONS IN PI(+) K(+)P INTERACTIONS AT 250 GEV/C/

The NA22 data on pi(-)pi(-) correlations are analyzed in terms of a nu mber of two- and three-dimensional parametrizations (Gaussian space-ti me, Goldhaber, Bowler string-like, Bertsch hydrodynamical, Kopylov-Pod goretskii, etc.), Contrary to the results obtained for e(+)e(-) and mu p collisions, the Goldhaber parametrization, as well as string-like m odels, fail in describing the hadron-hadron data. Better fits are obta ined in the framework of surface-emitting fireball-like models, both w hen including and excluding hydrodynamical expansion of nuclear matter . Our results indicate that pion radiation occurs at earlier stages of matter evolution than in nuclear collisions.