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; N. Tateyama; H. Yamagishi; T. Yuda

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. ShibataN. Tateyama, H. Yamagishi, T. Yuda

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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 language	English
Pages (from-to)	57-62
Number of pages	6
Journal	Journal of the Physical Society of Japan
Volume	78
Issue number	SUPPL. A
Publication status	Published - 2009

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., 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., ... 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.

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.

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title = "Electron spectrum in 10-1000 gev from bets & ppb-bets and future balloon observation",

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.",

keywords = "Balloon, Electron, Gamma-ray, International space station, JEM-EF, Scintillating fiber, Vela",

author = "T. Tamjra and Shoji Torii and K. Yoshida and H. Kitamura and T. Yamagami and J. Chang and I. Iijima and A. Kadokura and K. Kasahara and Y. Katayose and T. Kobayashi and Y. Komori and Y. Matsuzaka and K. Mizutani and H. Murakami and M. Namiki and J. Nishimura and S. Ohta and Y. Saito and M. Shibata and N. Tateyama and H. Yamagishi and T. Yuda",

year = "2009",

language = "English",

volume = "78",

pages = "57--62",

journal = "Journal of the Physical Society of Japan",

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T1 - Electron spectrum in 10-1000 gev from bets & ppb-bets and future balloon observation

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

Y1 - 2009

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.

KW - Balloon

KW - Electron

KW - Gamma-ray

KW - International space station

KW - JEM-EF

KW - Scintillating fiber

KW - Vela

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M3 - Article

AN - SCOPUS:66849104484

SN - 0031-9015

VL - 78

SP - 57

EP - 62

JO - Journal of the Physical Society of Japan

JF - Journal of the Physical Society of Japan

IS - SUPPL. A

ER -

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

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Keywords

ASJC Scopus subject areas

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