Limits on nu/sub. mu. /. --> nu. /sub tau/ and. nu. /sub. mu. /. --> nu. /sub e/ oscillations

Limits on ..nu../sub ..mu../..--> nu../sub tau/ and ..nu../sub ..mu../..--> nu../sub e/ neutrino oscillations have been determined using a massive fine-grained calorimeter exposed to a narrow-band neutrino beam at Fermilab. We have searched for neutrino-oscillation candidates by selecting events with the quasielastic topology. By having a visible energy which is predominantly in the lepton sector, this type of event has sensitivity to neutrino oscillations and a signature which is indicative of the incident neutrino flavor. From cuts on the event energy allowed by the properties of the incident narrow-band beam, we have determined the following limits at the 90% confidence level for the neutrino-mass-squared difference ..delta..m/sup 2/ at maximum mixing: ..nu../sub ..mu../..--> nu../sub tau/, ..delta..m/sup 2/ ..nu-bar/sub tau/, ..delta..m/sup 2/ nu../sub e/, ..delta..m/sup 2/ ..nu-bar/sub e/, ..delta..m/sup 2/ nu../sub tau/, sin/sup 2/2theta ..nu-bar/sub tau/, sin/sup 2/2theta nu../sub e/, sin/sup 2/2theta ..nu-bar/sub e/, sin/sup 2/2theta<0.04. .AE