Measurement of the cosmic ray and neutrino-induced muon flux at the Sudbury neutrino observatory
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Author(s)
Formaggio, Joseph A.
Miller, M. L.
Monroe, Jocelyn
Ott, Richard A.
Sonley, T. J.
Monreal, Benjamin, 1977-
Date Issued
July 2009
Journal
Physical Review D
Publisher
American Physical Society
Citation
Aharmim, B. et al "Measurement of the cosmic ray and neutrino-induced muon flux at the Sudbury neutrino observatory." Physical Review D 80.1 (2009): 012001. © 2009 The American Physical Society
Version
Final published version
Abstract
Results are reported on the measurement of the atmospheric neutrino-induced muon flux at a depth of 2 kilometers below the Earth’s surface from 1229 days of operation of the Sudbury Neutrino Observatory (SNO). By measuring the flux of through-going muons as a function of zenith angle, the SNO experiment can distinguish between the oscillated and unoscillated portion of the neutrino flux. A total of 514 muonlike events are measured between -1≤cosθ[subscript zenith]≤0.4 in a total exposure of 2.30×10[superscript 14] cm[superscript 2] s. The measured flux normalization is 1.22±0.09 times the Bartol three-dimensional flux prediction. This is the first measurement of the neutrino-induced flux where neutrino oscillations are minimized. The zenith distribution is consistent with previously measured atmospheric neutrino oscillation parameters. The cosmic ray muon flux at SNO with zenith angle cosθ[subscript zenith]>0.4 is measured to be (3.31±0.01(stat)±0.09(sys))×10[superscript -10] μ/s/cm[superscript 2].
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
http://dx.doi.org/10.1103/PhysRevD.80.012001
