タムラ タダヒサ   Tamura Tadahisa
  田村 忠久
   所属   神奈川大学  工学部 物理学教室
    神奈川大学大学院  工学研究科 工学専攻(応用物理学領域)
   職種   教授
言語種別 日本語
発行・発表の年月 2011/08
形態種別 学術雑誌
標題 Measurements of Cosmic-ray Electron and Gamma-ray Flux with Balloon-Borne CALET Prototype
執筆形態 共著
掲載誌名 32nd INTERNATIONAL COSMIC RAY CONFERENCE, BEIJING 2011
巻・号・頁 6,17-20頁
著者・共著者 T.NIITA, S.TORII, K.KASAHARA, T.TAMURA, K.YOSHIDA, Y.KATAYOSE, H.MURAKAMI, S.OZAWA,
Y.SHIMIZU, Y.AKAIKE, Y.UEYAMA, D.ITO, M.KARUBE, K.KONDO, M.KYUTAN
概要 We carried out the balloon experiments using CALET (CALorimetric Electron Telescope) prototype detectors
in May 2006 (bCALET-1) and August 2009 (bCALET-2) for verification of both the detector performance and the
capability of measuring the cosmic rays at higher atmosphere. The bCALET-2 instrument for observing the electrons
and the gamma rays at energies in 1-100 GeV is composed of an imaging calorimeter consisting of 4096 scintillating
fibers with a total of 3.6 radiation lengths of tungsten plates, and a total absorption calorimeter consisting of crossed 60
BGO logs with a total of 13.4 radiation lengths depth. The bCALET-2 was launched from the Taiki Aerospace Research
Field, Japan Aerospace Exploration Agency, in Hokkaido, and flew successfully for 2.5 hours at a level altitude of 35
km. In this paper, we will present the spectra of electrons and gamma rays in the energy range of 1-100 GeV measured
by bCALET-2, comparing with our previous observations, bCALET-1 and BETS. The detector performance is studied by
comparing with the simulations, and the observed fluxes are found to be compatible with the expected.