Measurements of cosmic-ray electron and gamma-ray flux with balloon-borne CALET prototype

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

研究成果: Paper査読

2 被引用数 (Scopus)


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.

出版ステータスPublished - 2011
イベント32nd International Cosmic Ray Conference, ICRC 2011 - Beijing, China
継続期間: 2011 8月 112011 8月 18


Conference32nd International Cosmic Ray Conference, ICRC 2011

ASJC Scopus subject areas

  • 核物理学および高エネルギー物理学


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