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Observation of a nonspherical pion source in relativistic heavy-ion collisions.

The intensity interferometry method has been used to measure pion-source parameters in the reaction 1.70A-GeV /sup 56/Fe+Fe..-->..2..pi../sup -/+X. The parameters show an oblate source for a narrow-acceptance spectrometer near either 0/sup 0/ or 90/sup 0/ with respect to the beam axis in the center-of-mass frame. Intranuclear-cascade--model predictions show similar behavior and are compared to the experimental results.