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Measurement of Cosmic-Ray Proton, Antiproton and Muon Spectra at Mountain Altitude

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arxiv astro-ph/0305529 v1 pith:VHXL3VXR submitted 2003-05-28 astro-ph

Measurement of Cosmic-Ray Proton, Antiproton and Muon Spectra at Mountain Altitude

T. Sanuki , M. Fujikawa , K. Abe , K. Anraku , H. Fuke , S. Haino , M. Imori , K. Izumi
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T. Maeno Y. Makida N. Matsui H. Matsumoto H. Matsunaga J. Nishimura M. Nozaki S. Orito M. Sasaki Y. Shikaze J. Suzuki K. Tanaka A. Yamamoto Y. Yamamoto K. Yamato T. Yoshida K. Yoshimura
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keywords antiprotonmuonprotonspectraaltitudecosmic-rayenergymeasurement
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Measurement of cosmic-ray proton, antiproton and muon spectra was carried out at mountain altitude. We observed 2 x 10^5 protons and 10^2 antiprotons in a kinetic energy region of 0.25 -- 3.3 GeV. Zenith-angle dependence of proton fluxes was obtained. Atmospheric muon spectra were measured simultaneously. The observed antiproton spectrum showed some deviation from theoretical predictions particularly in a low energy region.

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