M. Jones

Limits on the neutrino oscillations ν ¯ μ → ν ¯ e and ν ¯ μ → ν ¯ τ using a narrow-band beam

In an exposure of the Fermilab 15-ft bubble chamber to the dichromatic antineutrino beam, 427 nu-bar/sub ..mu../ charged-current interactions were obtained. Taking advantage of the small and well understood background flux of nu-bar/sub e/s in the dichromatic nu-bar/sub ..mu../ beam, upper limits on the rates of antineutrino oscillations are obtained, with the precision limited by statistical rather than systematic errors, in contrast to previous experiments. The 90%-C.L. upper limits obtained for the average oscillation probabilities indicated are P(nu-bar/sub ..mu../..-->..nu-bar/sub e/) ..nu-bar/sub tau/)<4.4 x 10/sup -2/. The mean value of the distance from the neutrino-production point to the bubble chamber divided by the neutrino energy, , is 0.03 m/MeV.

A neutrino (antineutrino)-induced four lepton event

Abstract We report observation of a neutrino (antineutrino)-induced event with two electrons, one positron, one positively charged muon, a neutral K meson, and seven gammas in an experiment performed in the FNAL 15-ft. bubble chamber with a 47% atomic mixture of neon in hydrogen. Estimated experimental electron backgrounds are ∼10 −4 per track. At present we have no plausible interpretation of this event.

Comparison of electron and muon charged current neutrino and antineutrino interactions in a neonH2 mixture

Abstract From an exposure of the Fermilab 15 ft Neon(64 atomic %)ue5f8H2 filled bubble chamber to a single-horn-focussed ν beam, we have found 60 e−X and 35 e+X events, which we compare with 227 μ−X and 202 μ+X events. No statistically significant departures from μ-e universality are seen in the shapes of various differential cross sections.