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  • PhysRevD.80.012001

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Measurement of the cosmic ray and neutrino-induced muon flux at the Sudbury neutrino observatory

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  • SNO Collaboration
Article number012001
<mark>Journal publication date</mark>10/07/2009
<mark>Journal</mark>Physical Review D
Issue number1
Number of pages15
Publication StatusPublished
<mark>Original language</mark>English


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≤cosθzenith≤0.4 in a total exposure of 2.30×1014  cm2 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 cosθzenith>0.4 is measured to be (3.31±0.01(stat)±0.09(sys))×10−10  μ/s/cm2.

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© 2009 The American Physical Society