Observation of the East-West Anisotropy of the Atmospheric Neutrino Flux
- Institute for Cosmic Ray Research, University of Tokyo, Tanashi, Tokyo 188-8502 (Japan)
- Department of Physics, Boston University, Boston, Massachusetts 02215 (United States)
- Physics Department, Brookhaven National Laboratory, Upton, New York 11973 (United States)
- Department of Physics and Astronomy, University of California, Irvine, Irvine, California 92697-4575 (United States)
- Department of Physics, California State University, Dominguez Hills, Carson, California 90747 (United States)
- Department of Physics, George Mason University, Fairfax, Virginia 22030 (United States)
- Department of Physics, Gifu University, Gifu, Gifu 501-1193 (Japan)
- Department of Physics and Astronomy, University of Hawaii, Honolulu, Hawaii 96822 (United States)
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801 (Japan)
- Department of Physics, Kobe University, Kobe, Hyogo 657-8501 (Japan)
- Physics Division, P-23, Los Alamos National Laboratory, Los Alamos, New Mexico 87544 (United States)
The east-west anisotropy, caused by the deflection of primary cosmic rays in the Earth{close_quote}s magnetic field, is observed for the first time in the flux of atmospheric neutrinos. Using a 45thinspthinspktthinspyr exposure of the Super-Kamiokande detector, 552thinspthinspe -like and 633thinspthinsp{mu} -like horizontally going events are selected in the momentum range between 400 and 3000 thinspMeV/c . The azimuthal distributions of e -like and {mu} -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. {copyright} {ital 1999} {ital The American Physical Society}
- OSTI ID:
- 365963
- Journal Information:
- Physical Review Letters, Vol. 82, Issue 26; Other Information: PBD: Jun 1999
- Country of Publication:
- United States
- Language:
- English
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