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Search for antineutrino oscillations in a neon/hydrogen bubble chamber

Thesis/Dissertation ·
OSTI ID:6264973
The FNAL 15' bubble chamber was exposed to a wide-band antineutrino/sub ..mu../ beam with a slight contamination of antineutrino/sub e/, nu/sub ..mu../ and nu/sub e/. The observed ratio of single-e/sup +/ events to single-..mu../sup +/ events was compared with a Monte-Carlo prediction of the expected antineutrino/sub e//antineutrino/sub ..mu../ charged-current (CC) event ratio due to oscillations, taking into account the expected antineutrino/sub e/ contamination. In the standard two-neutrino oscillation model, the following 90% C.L. limits were found for antineutrino/sub ..mu../ in equilibrium antineutrino/sub e/ oscillations: ..delta..m/sup 2/ < 0.7 eV/sup 2/ (for sin/sup 2/ 2..cap alpha.. = I) and sin/sup 2/ 2..cap alpha.. < 0.018 (for ..delta..m/sup 2/ ..-->.. infinity). The kinemati characteristics of the e/sup +/ events were compared with Monte-Carlo predictions for antineutrino/sub e/ CC interactions and for antineutrino/sub tau/ CC interactions followed by the decay tau/sup +/ ..-->.. e/sup +/ nu/sub e/antineutrino/sub tau/, to set similar limits on antineutrino/sub ..mu../ in equilibrium antineutrino/sub tau/ oscillations: ..delta..m/sup 2/ < 2.2 eV/sup 2/ and sin/sup 2/ 2..cap alpha.. < 0.048.
Research Organization:
Michigan Univ., Ann Arbor (USA)
OSTI ID:
6264973
Country of Publication:
United States
Language:
English