Abstract
Two-pion interferometry analysis of the Plastic Ball data for Au+Au and Nb+Nb interactions at 650 A MeV kinetic energy is presented. The values of 3.4±0.4 fm and 4.8±0.6 fm for pion source sizes and 3.6±0.8 fm /c and 5.7±0.7 fm /c for lifetimes are obtained for the Nb+Nb and Au+Au cases, respectively. No significant change in radius as a function of multiplicity has been observed. However, the selection of π+ with low momenta in the center of mass system reveals an enlarged radius for the Au+Au system but no such increase for Nb+Nb .
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