Study of the atmospheric neutrino flux in the multi-GeV energy range.

Details Study of the atmospheric neutrino flux in the multi-GeV energy range. Study of the atmospheric neutrino flux in the multi-GeV energy range.

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998phlb..436...33f&link_type=abstract

Physics Letters B, Vol. 436, No. 1 - 2, p. 33 - 41

Physics

333

Earth Atmosphere: Neutrinos

Scientific paper

The flavor ratio of the atmospheric neutrino flux and its zenith angle dependence have been studied in the multi-GeV energy range using an exposure of 25.5 kiloton-years of the Super-Kamiokande detector. By comparing the data to a detailed Monte Carlo simulation, the ratio (μ/e)DATA/(μ/e)MC was measured to be 0.66±0.06(stat.)±0.08(sys.). In addition, a strong distortion in the shape of the μ-like event zenith angle distribution was observed. The ratio of the number of upward to downward μ-like events was found to be 0.52(-0.06,+0.07)(stat.)±0.01(sys.), with an expected value of 0.98±0.03(stat.)±0.02(sys.), while the same ratio for the e-like events was consistent with unity.

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