Observation of the East-West anisotropy of the atmospheric neutrino flux

Super-Kamiokande Collaboration

Research output: Contribution to journalArticlepeer-review

85 Citations (Scopus)


The east-west anisotropy, caused by the deflection of primary cosmic rays in the Earth's magnetic field, is observed for the first time in the flux of atmospheric neutrinos. Using a 45 kt yr exposure of the Super-Kamiokande detector, 552 e-like and 633 μ-like horizontally going events are selected in the momentum range between 400 and 3000 MeV/c. The azimuthal distributions of e-like and μ-like events agree with the expectation from atmospheric neutrino flux calculations, verifying that the flux of atmospheric neutrinos in the GeV energy range is reasonably well modeled by calculations that account for the geomagnetic field.

Original languageEnglish
Pages (from-to)5194-5197
Number of pages4
JournalPhysical Review Letters
Issue number26
Publication statusPublished - 1999
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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