Search for ${\nu }_{\mu }$→${\nu }_e$ oscillations

We present the results of a search for neutrino oscillations conducted at Brookhaven National Laboratory. The experiment searched for the appearance of ${\nu }_e$ 1 km from the source of a 1.4-GeV (mean energy) narrow-band ${\nu }_{\mu }$ beam. With 3×${10}^{19}$ protons on target from the Alternating Gradient Synchrotron, no excess of ${\nu }_e$ was detected. The 90% confidence limits obtained are Δ$m^2$≤0.10 ${\mathrm{eV}}^2$ for maximal mixing, and ${\sin }^2$2θ≤0.016 for large Δ$m^2$.