Simultaneous measurement of two-nucleon (nn, np, PP) correlations have been
performed at GANIL for the reaction Ar-40+Ni-58 at 77 MeV/u. The aim of th
e experiment was to find the space-time properties of nucleon emission proc
ess in intermediate energy heavy ion collisions and to clarify some related
questions. Comparative analysis for protons and neutrons indicates an impo
rtant role of Coulomb effects. Quantitative analysis is in progress.