Observation of the east-west anisotropy of the atmospheric neutrino flux
نویسندگان
چکیده
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·year 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 distribution of e-like and μ-like events agrees with the expectation from atmospheric neutrino flux calculations that account for the geomagnetic field, verifying that the geomagnetic field effects in the production of atmospheric neutrinos in the GeV energy range are well understood. 96.40.Tv,14.60.Pq,95.85.Ry Typeset using REVTEX
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تاریخ انتشار 1999