Observation of. mu. e events in anti. nu. and. nu. interactions in the Fermilab 15' neon-H bubble chamber. [Rates]

In an exposure of the Fermilab 15' neon (64 atomic %)--H/sub 2/ bubble chamber to a broad band anti ..nu.. beam, 3 ..mu../sup +/e/sup -/X and 6 ..mu../sup -/e/sup +/X events (with estimated backgrounds 1.1 and 0.6 events, respectively) were found with the ..mu../sup +-/ identified in the EMI. The fractions of ..mu../sup +/e/sup -/ and ..mu../sup -/e/sup +/ production relative to anti ..nu../sub ..mu../ and ..nu../sub ..mu../ charged current interactions are respectively anti f = (0.10 +- /sub 0.07//sup 0.13/)% and f = (0.34 +- /sub 0.13//sup 0.23/)%, giving anti f/f = 0.3 +- /sub 0.2//sup 0.5/.