DIRECTIONAL DEPENDENCE OF THE PION SOURCE IN HIGH-ENERGY HEAVY-ION COLLISIONS

pi(+)pi(+) and pi(-)pi(-) correlations from 200 GeV per nucleon S + Pb collisions and pi(+)pi(+) correlations from 450 GeV p + Pb collisions measured by the focussing spectrometer of CERN experiment NA44 are pr esented. The large data set which emphasizes small values of momentum difference allows multi-dimensional analysis along with the more tradi tional one-dimensional parameterization to characterize the pion emiss ion source. It is found that the three radius parameters are similar a nd large compared to the projectile radius. This can be explained by p ion scattering in the final state hadronic system.