A sensitivity study showing Hyper-Kamiokande can use atmospheric neutrinos to reconstruct the primary cosmic ray spectrum, cutting its flux uncertainty from about 20% to 7% and sharpening neutrino oscillation measurements.
Measurement of a small atmospheric $\nu_\mu/\nu_e$ ratio
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abstract
From an exposure of 25.5~kiloton-years of the Super-Kamiokande detector, 900 muon-like and 983 electron-like single-ring atmospheric neutrino interactions were detected with momentum $p_e > 100$ MeV/$c$, $p_\mu > 200$ MeV/$c$, and with visible energy less than 1.33 GeV. Using a detailed Monte Carlo simulation, the ratio $(\mu/e)_{DATA}/(\mu/e)_{MC}$ was measured to be $0.61 \pm 0.03(stat.) \pm 0.05(sys.)$, consistent with previous results from the Kamiokande, IMB and Soudan-2 experiments, and smaller than expected from theoretical models of atmospheric neutrino production.
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Measuring the Cosmic Ray Spectrum with Next Generation Neutrino Detectors
A sensitivity study showing Hyper-Kamiokande can use atmospheric neutrinos to reconstruct the primary cosmic ray spectrum, cutting its flux uncertainty from about 20% to 7% and sharpening neutrino oscillation measurements.