Electron spectrum in 10-1000 gev from bets & ppb-bets and future balloon observation

T. Tamjra, Shoji Torii, K. Yoshida, H. Kitamura, T. Yamagami, 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 & 3 others N. Tateyama, H. Yamagishi, T. Yuda

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    We carried out electron observations with balloons to investigate acceleration and propagation of electrons in the universe. We developed BETS (Balloon-borne Electron Telescope with Scintillation fibers) for electron observations in Sanriku. We obtained electron energy spectrum from 10 GeV to 100 GeV with it. At higher energies, the energy spectrum of electron might show some structure caused by nearby sources like the Vela supernova remnant. In order to observe the energy spectrum above 100 GeV, we needed a thicker calorimeter and a longer observation time. We developed PPB-BETS (Polar Patrol Balloon-BETS) by improving BETS to carry out a long duration ballooning in Antarctica. Energy spectrum of electrons from 100 GeV to 1000 GeV was obtained by a successful fight for 13 days. The arrival direction of electrons seems to be consistent with isotropic distribution for the data taken with PPB-BETS, although we need better statistics to make it clear. We have a future plan to make an observation of electrons and gamma-rays with a scale model of CALET (CALorimetric Electron Telescope) by long duration ballooning in the southern hemisphere for 2 weeks. We proposed CALET for the cosmic-ray observations on the International Space Station (ISS), and it has been selected as one of mission candidates for the second utilization plan on the Exposure Facility of the Japanese Experiment Module (JEM-EF). We are developing a scale model of 1/16 of CALET.

    Original languageEnglish
    Pages (from-to)57-62
    Number of pages6
    JournalJournal of the Physical Society of Japan
    Volume78
    Issue numberSUPPL. A
    Publication statusPublished - 2009

    Fingerprint

    particle telescopes
    balloons
    scintillating fibers
    energy spectra
    patrols
    electrons
    scale models
    Southern Hemisphere
    International Space Station
    Antarctic regions
    supernova remnants
    calorimeters
    arrivals
    cosmic rays
    universe
    modules
    statistics
    gamma rays
    electron energy
    propagation

    Keywords

    • Balloon
    • Electron
    • Gamma-ray
    • International space station
    • JEM-EF
    • Scintillating fiber
    • Vela

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

    Cite this

    Tamjra, T., Torii, S., Yoshida, K., Kitamura, H., Yamagami, T., Chang, J., ... Yuda, T. (2009). Electron spectrum in 10-1000 gev from bets & ppb-bets and future balloon observation. Journal of the Physical Society of Japan, 78(SUPPL. A), 57-62.

    Electron spectrum in 10-1000 gev from bets & ppb-bets and future balloon observation. / Tamjra, T.; Torii, Shoji; Yoshida, K.; Kitamura, H.; Yamagami, T.; Chang, J.; Iijima, I.; Kadokura, A.; Kasahara, K.; Katayose, Y.; Kobayashi, T.; Komori, Y.; Matsuzaka, Y.; Mizutani, K.; Murakami, H.; Namiki, M.; Nishimura, J.; Ohta, S.; Saito, Y.; Shibata, M.; Tateyama, N.; Yamagishi, H.; Yuda, T.

    In: Journal of the Physical Society of Japan, Vol. 78, No. SUPPL. A, 2009, p. 57-62.

    Research output: Contribution to journalArticle

    Tamjra, T, Torii, S, Yoshida, K, Kitamura, H, Yamagami, T, Chang, J, Iijima, I, Kadokura, A, Kasahara, K, Katayose, Y, Kobayashi, T, Komori, Y, Matsuzaka, Y, Mizutani, K, Murakami, H, Namiki, M, Nishimura, J, Ohta, S, Saito, Y, Shibata, M, Tateyama, N, Yamagishi, H & Yuda, T 2009, 'Electron spectrum in 10-1000 gev from bets & ppb-bets and future balloon observation', Journal of the Physical Society of Japan, vol. 78, no. SUPPL. A, pp. 57-62.
    Tamjra T, Torii S, Yoshida K, Kitamura H, Yamagami T, Chang J et al. Electron spectrum in 10-1000 gev from bets & ppb-bets and future balloon observation. Journal of the Physical Society of Japan. 2009;78(SUPPL. A):57-62.
    Tamjra, T. ; Torii, Shoji ; Yoshida, K. ; Kitamura, H. ; Yamagami, T. ; Chang, J. ; Iijima, I. ; Kadokura, A. ; Kasahara, K. ; Katayose, Y. ; Kobayashi, T. ; Komori, Y. ; Matsuzaka, Y. ; Mizutani, K. ; Murakami, H. ; Namiki, M. ; Nishimura, J. ; Ohta, S. ; Saito, Y. ; Shibata, M. ; Tateyama, N. ; Yamagishi, H. ; Yuda, T. / Electron spectrum in 10-1000 gev from bets & ppb-bets and future balloon observation. In: Journal of the Physical Society of Japan. 2009 ; Vol. 78, No. SUPPL. A. pp. 57-62.
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    abstract = "We carried out electron observations with balloons to investigate acceleration and propagation of electrons in the universe. We developed BETS (Balloon-borne Electron Telescope with Scintillation fibers) for electron observations in Sanriku. We obtained electron energy spectrum from 10 GeV to 100 GeV with it. At higher energies, the energy spectrum of electron might show some structure caused by nearby sources like the Vela supernova remnant. In order to observe the energy spectrum above 100 GeV, we needed a thicker calorimeter and a longer observation time. We developed PPB-BETS (Polar Patrol Balloon-BETS) by improving BETS to carry out a long duration ballooning in Antarctica. Energy spectrum of electrons from 100 GeV to 1000 GeV was obtained by a successful fight for 13 days. The arrival direction of electrons seems to be consistent with isotropic distribution for the data taken with PPB-BETS, although we need better statistics to make it clear. We have a future plan to make an observation of electrons and gamma-rays with a scale model of CALET (CALorimetric Electron Telescope) by long duration ballooning in the southern hemisphere for 2 weeks. We proposed CALET for the cosmic-ray observations on the International Space Station (ISS), and it has been selected as one of mission candidates for the second utilization plan on the Exposure Facility of the Japanese Experiment Module (JEM-EF). We are developing a scale model of 1/16 of CALET.",
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    AU - Tamjra, T.

    AU - Torii, Shoji

    AU - Yoshida, K.

    AU - Kitamura, H.

    AU - Yamagami, T.

    AU - Chang, J.

    AU - Iijima, I.

    AU - Kadokura, A.

    AU - Kasahara, K.

    AU - Katayose, Y.

    AU - Kobayashi, T.

    AU - Komori, Y.

    AU - Matsuzaka, Y.

    AU - Mizutani, K.

    AU - Murakami, H.

    AU - Namiki, M.

    AU - Nishimura, J.

    AU - Ohta, S.

    AU - Saito, Y.

    AU - Shibata, M.

    AU - Tateyama, N.

    AU - Yamagishi, H.

    AU - Yuda, T.

    PY - 2009

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    N2 - We carried out electron observations with balloons to investigate acceleration and propagation of electrons in the universe. We developed BETS (Balloon-borne Electron Telescope with Scintillation fibers) for electron observations in Sanriku. We obtained electron energy spectrum from 10 GeV to 100 GeV with it. At higher energies, the energy spectrum of electron might show some structure caused by nearby sources like the Vela supernova remnant. In order to observe the energy spectrum above 100 GeV, we needed a thicker calorimeter and a longer observation time. We developed PPB-BETS (Polar Patrol Balloon-BETS) by improving BETS to carry out a long duration ballooning in Antarctica. Energy spectrum of electrons from 100 GeV to 1000 GeV was obtained by a successful fight for 13 days. The arrival direction of electrons seems to be consistent with isotropic distribution for the data taken with PPB-BETS, although we need better statistics to make it clear. We have a future plan to make an observation of electrons and gamma-rays with a scale model of CALET (CALorimetric Electron Telescope) by long duration ballooning in the southern hemisphere for 2 weeks. We proposed CALET for the cosmic-ray observations on the International Space Station (ISS), and it has been selected as one of mission candidates for the second utilization plan on the Exposure Facility of the Japanese Experiment Module (JEM-EF). We are developing a scale model of 1/16 of CALET.

    AB - We carried out electron observations with balloons to investigate acceleration and propagation of electrons in the universe. We developed BETS (Balloon-borne Electron Telescope with Scintillation fibers) for electron observations in Sanriku. We obtained electron energy spectrum from 10 GeV to 100 GeV with it. At higher energies, the energy spectrum of electron might show some structure caused by nearby sources like the Vela supernova remnant. In order to observe the energy spectrum above 100 GeV, we needed a thicker calorimeter and a longer observation time. We developed PPB-BETS (Polar Patrol Balloon-BETS) by improving BETS to carry out a long duration ballooning in Antarctica. Energy spectrum of electrons from 100 GeV to 1000 GeV was obtained by a successful fight for 13 days. The arrival direction of electrons seems to be consistent with isotropic distribution for the data taken with PPB-BETS, although we need better statistics to make it clear. We have a future plan to make an observation of electrons and gamma-rays with a scale model of CALET (CALorimetric Electron Telescope) by long duration ballooning in the southern hemisphere for 2 weeks. We proposed CALET for the cosmic-ray observations on the International Space Station (ISS), and it has been selected as one of mission candidates for the second utilization plan on the Exposure Facility of the Japanese Experiment Module (JEM-EF). We are developing a scale model of 1/16 of CALET.

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    KW - Gamma-ray

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    KW - JEM-EF

    KW - Scintillating fiber

    KW - Vela

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