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Cosmic-ray electron spectrum above 100 GeV from PPB-BETS experiment in Antarctica
Authors:K Yoshida  S Torii  T Yamagami  T Tamura  H Kitamura  J Chang  I Iijima  A Kadokura  K Kasahara  Y Katayose  T Kobayashi  Y Komori  Y Matsuzaka  K Mizutani  H Murakami  M Namiki  J Nishimura  S Ohta  Y Saito  M Shibata  N Tateyama  H Yamagishi  T Yuda
Institution:1. Department of Electronic Information Systems, Shibaura Institute of Technology, 307 Fukasaku, Minuma-ku, Saitama-shi 337-8570, Japan;2. Advanced Research Institute for Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan;3. Institute of Space and Astronautical Science, JAXA, 3-1-1 Oshinodai, Sagamihara 229-8510, Japan;4. Institute of Physics, Kanagawa University, 3-27-1 Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan;5. National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba-shi 263-8555, Japan;6. Purple Mountain Observatory, Chinese Academy of Sciences, 2 West Beijing Road, Nanjing 210008, China;g National Institute of Polar Research, 1-9-10 Kaga, Itabashi-ku, Tokyo 173-8515, Japan;h Department of Physics, Yokohama National University, 79-1 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan;i Department of Physics and Mathematics, Aoyama Gakuin University, 5-10-1 Fuchinobe, Sagamihara 229-8558, Japan;j Kanagawa University of Human Services, 1-10-1 Heiseicho, Yokosuka 238-8522, Japan;k Department of Physics, Saitama University, 255 Shimo-Okubo, Sakura-ku, Saitama-shi 338-8570, Japan;l Department of Physics, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima-ku, Tokyo 171-8501, Japan
Abstract:Cosmic-ray electrons have been observed in the energy region from 10 GeV to 1 TeV with the PPB-BETS by a long duration balloon flight using a Polar Patrol Balloon (PPB) in Antarctica. The observation was carried out for 13 days at an average altitude of 35 km in January 2004. The PPB-BETS detector is an imaging calorimeter composed of scintillating-fiber belts and plastic scintillators inserted between lead plates. In the study of cosmic-ray electrons, there have been some suggestions that high-energy electrons above 100 GeV are a powerful probe to identify nearby cosmic-ray sources and search for particle dark matter. In this paper, we present the energy spectrum of cosmic-ray electrons in the energy range from 100 GeV to 1 TeV at the top of atmosphere, and compare our spectrum with the results from other experiments.
Keywords:Long duration balloon  Cosmic-ray electrons  Cosmic-ray origin
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