A method is proposed to analyze the Bose-Einstein effect in lepton-hadron and $e^{+}$-$e^{\mathrm{-}}$ collisions in such a way as to measure longitudinal source extensions. A model is used which predicts measurable longitudinal source extensions as a function of excitation energy and meson-pair energy.

• Received 3 November 1987

DOI:https://doi.org/10.1103/PhysRevLett.60.987