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Study of High-energy Cosmic Gamma Rays and Cosmic Rays in Tibet.

Research Project

Project/Area Number 14340070
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 素粒子・核・宇宙線
Research InstitutionThe University of Tokyo (2003-2004)
Nagoya University (2002)

Principal Investigator

YUDA Toshinori  The University of Tokyo, Institute for Cosmic Ray Research, Professor Emeritus, 宇宙線研究所, 名誉教授 (60092368)

Co-Investigator(Kenkyū-buntansha) TAKITA Masato  The University of Tokyo, Institute for Cosmic Ray Research, Associate Professor, 宇宙線研究所, 助教授 (20202161)
OHNISHI Munehiro  The University of Tokyo, Institute for Cosmic Ray Research, Research Associate, 宇宙線研究所, 助手 (10260514)
YAMAMOTO Yoshiaki  Konan University, Faculty of Science and Technology, Professor, 理工学部, 教授 (70068112)
HOTTA Naoki  Utsunomiya University, Faculty of Education, Professor, 教育学部, 教授 (60157039)
Project Period (FY) 2002 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥14,600,000 (Direct Cost: ¥14,600,000)
Fiscal Year 2004: ¥4,200,000 (Direct Cost: ¥4,200,000)
Fiscal Year 2003: ¥4,300,000 (Direct Cost: ¥4,300,000)
Fiscal Year 2002: ¥6,100,000 (Direct Cost: ¥6,100,000)
KeywordsTibet / air shower array / knee energy region / emulsion chamber / burst detector / cosmic-ray acceleration / cosmic-ray anisotropy / supernova remnant / knee / 連動実験 / コア検出器 / 一次宇宙線 / 高エネルギーガンマ線 / 太陽の影 / 太陽磁場 / 空気シャワー / 空気シャワーアレイ / 活動的天体
Research Abstract

We study high-energy cosmic gamma rays and cosmic rays with an air shower array (Tibet-II and Tibet-III) in Tibet as a joint research with China. The main research purpose is to study the origin and acceleration mechanism of high-energy cosmic rays by the observation of high-energy primary cosmic-ray energy spectrum and by observation/search of celestial high-energy cosmic gamma-ray point sources
From 1996 to 1999, we set up 80 m^2 emulsion chambers and burst detectors at the center of Tibet-II and studied the energy spectrum of primary cosmic-ray protons in the knee energy region. We obtained the energy spectrum of protons above 10^<15> eV for the first time in the world, by analyzing the emulsion chamber data. The measured energy spectrum showed steepening of the spectral index in the power-law spectrum compared with that below 10^<14> eV, suggesting the acceleration scenario of cosmic rays in the shock wave in a supernova remnant. For this pupose, we developed an automatic analysis device of X-ray films based on a commercial image scanner which enabled us to process X-ray film data. We also did R&D studies of a burst detector array (1000 m^2) for selectively detecting heavy nuclei in the knee energy region, in cooperation with Tibet-III. Four test detectors with a plastic scintillator and optical fibers were setup and in operation in the Tibet-III.
We also successfully observed the energy dependence of the apparent anisotropy in multi-TeV galactic cosmic-ray intensitiy due to the terrestrial orbital motion around the Sun for the first time in the world. We obtained a new result on the cosmic-ray anisotropy at the sidereal time frame as well.

Report

(4 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • 2002 Annual Research Report
  • Research Products

    (27 results)

All 2005 2004 2003 2002 Other

All Journal Article (16 results) Publications (11 results)

  • [Journal Article] Large-scale sidereal anisotropy of Galactic cosmic ray intensity observed by the Tibet air shower array2005

    • Author(s)
      M.Amenomori et al.
    • Journal Title

      The Astrophysical Journal Letters (in press)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Observation by an air-shower array in Tibet of multi-TeV cosmic-ray anisotropy due to terrestrial orbital motion around the Sun2004

    • Author(s)
      M.Amenomori et al.
    • Journal Title

      Physical Review Letters 94・6

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Automatic analysis of the emulsion chamber using the image scanner applied to the Tibet hybrid experiment2004

    • Author(s)
      S.Ozawa et al.
    • Journal Title

      Nuclear Instruments and Methods in Physics Research A523

      Pages: 193-205

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Observation by an air-shower array in Tibet of multi-TeV cosmic ray anisotropy due to terrestrial orbital motion around the Sun2004

    • Author(s)
      M.Amenomori et al.
    • Journal Title

      Physical Review Letters 94-6

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Automatic analysis of the emulsion chamber using the image scanner applied to the Tibet hybrid experiment2004

    • Author(s)
      S.Ozawa et al.
    • Journal Title

      Nuclear Instruments and Methods A523

      Pages: 193-205

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Primary proton spectrum in the knee region observed by the Tibet hybrid experiment2003

    • Author(s)
      M.Amenomori et al.
    • Journal Title

      Proceedings of the 28^<th> International Cosmic Ray Conference, Tsukuba,2003 1

      Pages: 107-110

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] An experiment to measure the spectra of primary proton, helium and iron nuclei at the ‘knee' region at a high altitude2003

    • Author(s)
      X.W Xu et al.
    • Journal Title

      Journal of Physics G : Nuclear and Particle Physics 29

      Pages: 719-735

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Primary proton spectrum in the knee region observed by the Tibet hybrid experiment2003

    • Author(s)
      M.Amenomori et al.
    • Journal Title

      Proceedings of the 28^<th> International Cosmic Ray Conference, Tsukuba, 2003 1

      Pages: 107-110

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] An experiment to measure the spectra of primay proton, helium and iron nuclei at the 'knee' region at a high altitude2003

    • Author(s)
      X.W Xu et al.
    • Journal Title

      Journal of Physics G : Nuclear and Particle Physics 29

      Pages: 719-735

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Primary proton spectrum in the knee observed with the Tibet hybrid experiment2003

    • Author(s)
      M.Amnomori et al.
    • Journal Title

      Proceedings of the 28^<th> International Cosmic Ray Conference, Tsukuba, 2003 1

      Pages: 107-110

    • Related Report
      2004 Annual Research Report
  • [Journal Article] The energy spectrum of cosmic rays around the knee observed with the Tibet air shower array2003

    • Author(s)
      M.Mmenomori et al.
    • Journal Title

      Proceedings of the 28^<th> International Cosmic Ray Conference, Tsukuba, 2003 1

      Pages: 143-146

    • Related Report
      2004 Annual Research Report
  • [Journal Article] An experiment to measure the energy spectra of primary protons, heliums and heavy nuclei at a high altitude2003

    • Author(s)
      X.W Xu et al.
    • Journal Title

      Journal of Physics G : Nuclear and Particle Physics 29

      Pages: 719-735

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Primary proton spectrum around the knee deduced from the emulsion chamber data obtained at Mts Fuji and Kanbala2002

    • Author(s)
      J.Huang et al.
    • Journal Title

      Astroparticle Physics 18

      Pages: 637-648

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Primary proton spectrum around the knee deduced from the emulsion chamber data obtained at Mts Fuji and Kanbala2002

    • Author(s)
      J.Hwang et al.
    • Journal Title

      Astroparticle Physics 18

      Pages: 637-648

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Large-scale sidereal anisotropy of Galactic cosmic ray intensitiy observed by the Tibet air shower array

    • Author(s)
      M.Amenomori et al.
    • Journal Title

      The Astrophysical Journal Letters (in press)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Galactic anisotropy of 10 TeV cosmic-ray intensity observed by the Tibet air shower array

    • Author(s)
      M.Amenomori et al.
    • Journal Title

      Proceedings of the 28^<th> International Cosmic Ray Conference, Tsukuba, 2003 7

      Pages: 4061-4065

    • Related Report
      2004 Annual Research Report
  • [Publications] M.Amenomori et al.: "The energy spectrum of cosmic rays around the knee region observed with the Tibet air shower array"Proceedings of the 28th International Cosmic Ray Conference, Tsukuba, 2003. 1・1. 143-146 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] M.Amenomori et al.: "Primary proton spectrum in the knee observed with the Tibet hybrid experiment"Proceedings of the 28th International Cosmic Ray Conference, Tsukuba, 2003. 1・1. 107-110 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] X.W.Xu et al.: "An experiment to measure the energy spectra of primary protons, heliums and heavy nuclei at a high altitude"Journal of Physics G : Neuclear and Particle Physics. 29. 719-735 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] M.Amenomori et al.: "Observation of multi-TeV diffuse gamma rays from the Galactic plane with the Tibet air shower array"The Astrophysical Journal. 580・2. 887-895 (2002)

    • Related Report
      2003 Annual Research Report
  • [Publications] 湯田 利典: "チベットにおける高エネルギー宇宙線の研究"日本物理学会誌. 57・7. 483-491 (2002)

    • Related Report
      2003 Annual Research Report
  • [Publications] 湯田 利典: "銀河宇宙線がつくる"太陽の影"と太陽活動"天文月報. 95・8. 391-398 (2002)

    • Related Report
      2003 Annual Research Report
  • [Publications] X.W.Xu, T.Yuda, et al.: "An experiment to measure the energy spectra of primary protons, heliums and heavy nuclei at a high altitude"Journal of Physics, G. (in press). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] M.Amenomori et al.: "Observation of multi-TeV diffuse gamma rays from the Galactic plane with the Tibet air shower array"The Astrophysical Journal. 580・2. 887-895 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] J.Huang et al.: "Primary proton spectrum around the knee from the emulsion chamber data obtained at Mts. Fuji and Kanbala"Astroparticle Physics. 18・6. 637-648 (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] 湯田 利典: "チベットにおける高エネルギー宇宙線の研究"日本物理学会誌. 57・7. 483-491 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 湯田 利典: "銀河宇宙線がつくる"太陽の影"と太陽活動"天文月報. 95・8. 391-398 (2003)

    • Related Report
      2002 Annual Research Report

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Published: 2002-04-01   Modified: 2016-04-21  

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