Abstract
Reaction mean free paths in emulsions, of the secondary particles from $^{16}\mathrm{O}$ collisions, show normal behavior for the particles produced with P sintheta<200 MeV/c (theta is the lab emission angle and P the incident momentum per nucleon). For 200\ensuremath{\le}P sintheta<400 MeV/c, the particles exhibit shorter mean free paths for the first few cm from their origin than at larger distances. Conventional explanations of this result are rejected at 99.5% confidence level. The data are consistent with the presence of an \ensuremath{\sim}6% anomalous component with a mean free path of 1.8 cm. Primary deuteron mean free path at 2.1A GeV, measured for comparison, is 20.7\ifmmode\pm\else\textpm\fi{}2.6 cm.
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