Two-particle correlation functions for positive and negative pions have been measured in $\mathrm{Au}+\mathrm{Au}$ collisions at 10.8 GeV/c per nucleon. The data were analyzed using one- and three-dimensional correlation functions. From the results of the three-dimensional fit the phase space density of pions was calculated. It is consistent with local thermal equilibrium.

• Received 13 November 1996

DOI:https://doi.org/10.1103/PhysRevLett.78.2916