Experimental Limits on Neutrino Oscillations

A search for neutrino oscillations in a wide-band neutrino beam at Fermilab with use of the 15-ft bubble chamber is reported. No evidence is found for neutrino oscillations and upper limits are set on the mixing angles and neutrino mass differences in the transitions ${\nu }_{\mu }\to {\nu }_e$, ${\nu }_{\mu }\to {\nu }_{\tau }$, and ${\nu }_e\to {\nu }_{{}_{}{}^{\sim }{}_{}{}^{}e}$, where $\sim e$ denotes "not $e$."