Pion correlations in 1.8AGeV Ar on KCl and La and 1.2AGeV Xe on La

Results are presented for pion interferometry measurements of 1.8A GeV Ar+KCl and Ar+La, and 1.2A GeV Xe + La at the Lawrence Berkeley Laboratory Heavy Ion Spectrometer System. The parameters R, τ, λ, ${\mathit{R}}_{\mathrm{\perp }}$, and ${\mathit{R}}_{\mathrm{\parallel }}$ are presented for all three projectile-target combinations. The correlation between the extracted size of the pion source and the centrality of the collision is investigated as well as the freeze-out densities and the dependence of the source size on the mean momentum of the pion pairs. The experimental setup and analysis are discussed and comparisons made with the results of others. The phase space covered is at forward angles in the center-of-mass system.