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Development of high-energy particle astrophysics in Tibet

Research Project

Project/Area Number 17403004
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section海外学術
Research Field Particle/Nuclear/Cosmic ray/Astro physics
Research InstitutionKanagawa University

Principal Investigator

YUDA Toshinori  Kanagawa University, Faculty of Engineering, Professor (60092368)

Co-Investigator(Kenkyū-buntansha) TAKITA Masato  Univ. of Tokyo, ICRR, Associate Professor (20202161)
OHNISHI Munehiro  Univ. of Tokyo, ICRR, Assistant Professor (10260514)
HOTTA Naoki  Utsunomiya Univ., Faculty of Education, Professor (60157039)
YAMAMOTO Yoshiaki  Konan Univ., 理工学部, Associate Professor (70068112)
Project Period (FY) 2005 – 2007
Project Status Completed (Fiscal Year 2007)
Budget Amount *help
¥14,900,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2007: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2006: ¥4,000,000 (Direct Cost: ¥4,000,000)
Fiscal Year 2005: ¥5,700,000 (Direct Cost: ¥5,700,000)
KeywordsTibet / air-shower array / high energy gamma-ray / high-energy cosmic-ray / knee region / sun shadow / International Collaboration / China / ガンマ線天体 / 国際研究者交流 / 活動的天体 / 宇宙線 / 粒子線天体物理
Research Abstract

The present air-shower array at Yangbajing in Tibet was completed in the late fall of 2003 and has then been successively operating to date. The array(Tibet-III) consists of about 800 scintillation counters, which are deployed at a grid of 7.5m spacing covering the area of 37000m^2. The trigger rate of air-shower events is set to about 1.7kHz and the arrival direction of each event can be estimated with an inaccuracy of less than 0.9 degrees in the energy region over 3 TeV. The main objectives are to search for high-energy gamma rays from active celestial objects and to study very high energy Galactic cosmic rays. These observations are very important to clarify the origin of cosmic rays and their acceleration mechanism.
The main results obtained until now are as follows.
1) The energy spectrum of all-particle cosmic rays has been observed in the wide energy range from 10^<14> to 10^<17> eV with a sharp knee at the energy around 4x1015 eV.
2) The energy spectra of primary protons and heli … More ums are for the first time observed in the knee energy region.
3) High energy gamma rays above about 3 TeV have been successfully observed from the Crab Nebula and active galactic nuclei such as Mrk421 and Mrk501. A long-term correlation between RV gamma-ray s and X-ray flares from XMM Newton satellite was observed to provide information about electron acceleration at the source.
4) An energy dependence of the large-scale anisotropy of the Galactic cosmic rays has been for the first time observed and also significant anisotropy of multi-TeV cosmic rays is observed in the direction of Cygnus region.
5) A variation of the sun shadow during the solar activity cycles was successively monitored with the air shower array, and we succeeded to get new information about the solar magnetic field.
Last year we constructed a 100m^2 water-Cherenkov-type muon detector in the underground of the Tibet air shower array. The total area of muon detectors will be expanded up to about 10000m^2 in the very near future. This instrument with a wide field of view then becomes the most sensitive? gamma-ray detector at energies above several times 10 TeV in the world. It is expected that this experiment enables us to provide very important results on the acceleration of high energy cosmic rays, which is still unresolved. Less

Report

(4 results)
  • 2007 Annual Research Report   Final Research Report Summary
  • 2006 Annual Research Report
  • 2005 Annual Research Report
  • Research Products

    (35 results)

All 2008 2007 2006 2005 Other

All Journal Article (25 results) (of which Peer Reviewed: 6 results) Presentation (8 results) Remarks (2 results)

  • [Journal Article] The all-particle spectrum of primary cosmic rays in the wide energy range from 10^17 eV to 10^17 eV observed with the Tibet-III air-shower array2008

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

      The Astrophysical Journals 678

      Pages: 1165-1177

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] New Estimation of the Spectral Index of High-Energy Cosmic Rays as Determined by the Compton-Getting Anisotropy2008

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

      The Astrophysical Journal Letters 672

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Moon Shadow by Cosmic Rays under the Influence of Geomagnetic Field and Search for Antiprotons at Multi-TeV Energies2008

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

      Astroparticle Physics 28

      Pages: 137-142

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] The all-particle spectrum of primary cosmic rays in the wide energy range from 1014 to 1017 eV observed with the Tibet-III air shower array2008

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

      ApJ Vol.678

      Pages: 1165-1177

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] New estimation of the spectral index high energy cosmic rays as determined by the Compton-Getting anisotropy.2008

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

      ApJL Vol.672

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] The all-particle spectrum of primary cosmic rays in the wide energy range from 10^14 eV to 10^17 eV observed with the Tibet-III air-shower array2008

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

      The Astrophysical Journals 678

      Pages: 1165-1177

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] New Estimation of the Spectral Index of High-Energy Cosmic Rays as Determined by the Compton-Getting Anisotropy2008

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

      The Astrophysical Journal Letters 672

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Moon shadow by cosmic rays under the Influence of the geomagnetic filed and search for antiprotons At multi-TeV energies2007

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

      Astroparticle Phys. Vol.28

      Pages: 137-142

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Moon Shadow by Cosmic Rays under the Influence of Geomagnetic Field and Search for Antiprotons at Multi-TeV Energies2007

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

      Astroparticle Physics 28

      Pages: 137-142

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Are protons still dominant at the knee of the cosmic-ray energy spectrum?2006

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

      Phys. Lett. Vol.B632

      Pages: 58-64

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Flux upper limits of diffuse TeV gamma rays from the Galactic plane using the effective area of the Tibet-II and-III arrays.2006

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

      Adv. Space Res. Vol.37

      Pages: 1932-1937

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Anisotropy and Corotation of Galactic Cosmic Rays2006

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

      Science 314

      Pages: 439-443

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Are protons still dominant at the knee of cosmic-ray energy spectrum?2006

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

      Physical Letters B 632

      Pages: 58-64

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Primary proton spectrum around the knee observed by the Tibet air shower experiment.2006

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

      Advances in Space Research 37

      Pages: 1938-1943

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Variations of sun shadow in the solar cycle 23 observed with the Tibet air shower array2006

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

      Advances in Space Research 38

      Pages: 936-941

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Flux upper limits of diffuse gamma rays from the Galactic plane using the Tibet-III air shower array2006

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

      Advances in Space Research 37

      Pages: 1932-1937

    • Related Report
      2006 Annual Research Report
  • [Journal Article] On the upper limiting energy of the solar diurnal anisotropy of Galactic cosmic ray intensity2006

    • Author(s)
      K.Munakata et al.
    • Journal Title

      Advances in Geosciences 2

      Pages: 125-134

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Are protons still dominant at the knee of cosmic-ray energy spectrum?2006

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

      Physical Letters B632

      Pages: 58-64

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Flux upper limits of diffuse TeV gamma rays from the Galactic plane using the effective area of the Tibet-II and -III arrays2006

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

      Advances in Space Research (in press)

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Primary proton spectrum around the knee observed by the Tibet air shower experiment.2006

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

      Advances in Space Research (in press)

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Large-scale sidereal anisotropy of Galactic cosmic-ray intensity observed by the Tibet air shower array.2005

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

      ApJ Vol.626

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] A northern sky survey for study of TeV gamma-ray point sources using the Tibet air shower array2005

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

      ApJ Vol.633

      Pages: 1005-1012

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Observation of PeV gamma rays from the Monogem rings with the Tibet air shower array2005

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

      The Astrophysical Journal Letters 635

    • Related Report
      2005 Annual Research Report
  • [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 626

    • Related Report
      2005 Annual Research Report
  • [Journal Article] A Northern Sky Survey for Steady TeV Gamma-Ray Point Sources Using the Tibet Air Shower Array2005

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

      The Astrophysical Journal 633

      Pages: 1005-1012

    • Related Report
      2005 Annual Research Report
  • [Presentation] チベット水チェレンコフミューオン観測装置2008

    • Author(s)
      川田 和正
    • Organizer
      日本物理学会 第63回年次大会
    • Place of Presentation
      近畿大学
    • Year and Date
      2008-03-23
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Annual Research Report 2007 Final Research Report Summary
  • [Presentation] Tibet air shower array : Results and Plan2007

    • Author(s)
      K. Kawata
    • Organizer
      TAUP 2007
    • Place of Presentation
      Sendai, Japan
    • Year and Date
      2007-09-15
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Gamma-ray observation with the Tibet air shower experiment2007

    • Author(s)
      M. Ohnishi
    • Organizer
      Particle Astrophysics 2007
    • Place of Presentation
      Venice, Italy
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Chemical composition of cosmic rays at the knee measured by the Tibet Air shower core detector2007

    • Author(s)
      M. Shibata
    • Organizer
      Int. Cosmic Ray Conf.
    • Place of Presentation
      Merida, Mexico
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Future plan for observation of cosmic gamma rays in the 100 TeV energy region with the Tibet air shower array : physics goal and overview2007

    • Author(s)
      T. Sako
    • Organizer
      Int. Cosmic Ray Conf.
    • Place of Presentation
      Merida, Mexico
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Towards 100 TeV gamma-ray astronomy2006

    • Author(s)
      M. Takita
    • Organizer
      Int. Conf. The Extreme Universe in Suzaku Era
    • Place of Presentation
      Kyoto, Japan
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Revised upper limits of the diffuse gamma rays from the Galactic plane with the Tibet-II and-III air shower arrays2006

    • Author(s)
      Y. Yamamoto
    • Organizer
      ECRS2006
    • Place of Presentation
      Lisbon, Portugal
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Primary proton and helium spectra at the knee energy region measured by the Tibet air shower array2005

    • Author(s)
      J. Huang
    • Organizer
      Int. Cosmic Ray Conf.
    • Place of Presentation
      Pune, India
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Remarks] 「研究成果報告書概要(和文)」より

    • URL

      http://www.icrr.u-tokyo.ac.jp/em/index-j.html

    • Related Report
      2007 Final Research Report Summary
  • [Remarks]

    • URL

      http://www.icrr.u-tokyo.ac.jp/em/index-j.html

    • Related Report
      2007 Annual Research Report

URL: 

Published: 2005-04-01   Modified: 2016-04-21  

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