K.T. Lesko

Construction and performance of a large area liquid scintillator cosmic ray anticoincidence detector

Abstract We describe details of the construction and performance of a large area cylindrical cosmic ray anticoincidence detector suitable for a medium energy neutrino experiment. The device provides 4π coverage with approximately 400 m2 of liquid scintillator. Cosmic ray muons are rejected on-line with an inefficiency of ⋍ 10−4 which is improved to a level of ⋍ 3 × 10−6 or less with the application of off-line cuts. We also discuss the custom electronics used to operate and read out the device. Results from studies of the attenuation of neutral cosmic ray backgrounds by passive shielding are included.

Limits on ν¯μ→ν¯e oscillations

The result of a search for the neutrino oscillation mode nu-bar/sub ..mu../..-->..nu-bar/sub e/ in a fine-grained tracking detector is reported. The average neutrino energy is 40 MeV and the average detector distance from the neutrino source is 26.8 m. No evidence for neutrino oscillations through this mode is observed. Limits on deltam/sup 2/ and sin/sup 2/(2theta) are presented.

LIMITS ON anti-muon-neutrino ---> anti-electron-neutrino OSCILLATIONS

The result of a search for the neutrino oscillation mode nu-bar/sub ..mu../..-->..nu-bar/sub e/ in a fine-grained tracking detector is reported. The average neutrino energy is 40 MeV and the average detector distance from the neutrino source is 26.8 m. No evidence for neutrino oscillations through this mode is observed. Limits on deltam/sup 2/ and sin/sup 2/(2theta) are presented.

Limits on nu -bar micro--> nu -bare oscillations.

The result of a search for the neutrino oscillation mode nu-bar/sub ..mu../..-->..nu-bar/sub e/ in a fine-grained tracking detector is reported. The average neutrino energy is 40 MeV and the average detector distance from the neutrino source is 26.8 m. No evidence for neutrino oscillations through this mode is observed. Limits on deltam/sup 2/ and sin/sup 2/(2theta) are presented.