Abstract
Electron pairs have been materialized in emulsion, and 294 individual pair tracks with energies >5 GeV and visible path length >20 mm were closely examined. Cascade multiplication along each track is evaluated in terms of the conversion distance $y$ for the initial secondary pair, and the resultant $y$ distribution is compared with a theoretical prediction. Over the initial time interval ${10}^{\ensuremath{-}10}$ sec, cascade development appears to occur at a rate (30\ifmmode\pm\else\textpm\fi{}10)% less than expected. This result is considered critically.
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