Candidate events in a search for {bar {nu}}{sub {mu}}{r_arrow}{bar {nu}}{sub {ital e}} oscillations

Journal Article · Mon Oct 02 04:00:00 EDT 1995 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.75.2650· OSTI ID:118579

Athanassopoulos, C; Auerbach, L B; Bauer, D A; Bolton, R D; Boyd, B; Burman, R L; Caldwell, D O; Cohen, I; Dieterle, B D; Donahue, J B; Eisner, A M; Fazely, A; Federspiel, F J; Garvey, G T; Gray, M; Gunasingha, R M; Highland, V; Imlay, R; Johnston, K; Louis, W C ; Lu, A; Margulies, J; McIlhany, K; Metcalf, W; Reeder, R A; Sandberg, V; Schillaci, M; Smith, D; Stancu, I; Strossman, W; Sullivan, M K; VanDalen, G J; Vernon, W; Wang, Y; White, D H; Whitehouse, D; Works, D; Xiao, Y; Yellin, S ^[1]

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1. University of California, Riverside, California 92521 (United States)

A search for {bar {nu}}{sub {ital e}}`s in excess of the number expected from conventional sources has been made using the Liquid Scintillator Neutrino Detector, located 30 m behind the Los Alamos Meson Physics Facility beam stop. The {bar {nu}}{sub {ital e}} are detected via {bar {nu}}{sub {ital e}} {ital p}{r_arrow}{ital e}{sup +}{ital n} with {ital e}{sup +} energy between 36 and 60 MeV, followed by a {gamma} ray from {ital np}{r_arrow}{ital d}{gamma} (2.2 MeV). Using strict cuts to identify {gamma} rays correlated with {ital e}{sup +} yields 9 events with only 2.1{plus_minus}0.3 background expected. A likelihood fit to the entire {ital e}{sup +} sample results in a total excess of 16.4{sub {minus}8.9}{sup +9.7}{plus_minus}3.3 events. If attributed to {bar {nu}}{sub {mu}}{r_arrow}{bar {nu}}{sub {ital e}} oscillations, this corresponds to an oscillation probability of (0.34{sub {minus}0.18}{sup +0.20}{plus_minus}0.07)%.

• OSTI ID: 118579
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 14 Vol. 75; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ELECTRON NEUTRINOS
ENERGY
GAMMA RADIATION
LIQUID SCINTILLATION DETECTORS
LOS ALAMOS
MUON NEUTRINOS
NEUTRINO OSCILLATION