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Study of Ultra-high Energy Cosmic Rays at Tibetan Highlands

Research Project

Project/Area Number 01044039
Research Category

Grant-in-Aid for international Scientific Research

Allocation TypeSingle-year Grants
SectionJoint Research
Research InstitutionInstitute for Cosmic Ray Research, University of Tokyo

Principal Investigator

YUDA Toshinori  Professor, Institute for Cosmic Ray Research, Univ. of Tokyo, 宇宙線研究所, 教授 (60092368)

Co-Investigator(Kenkyū-buntansha) 任 敬儒  中国科学院, 高能物理研究所, 教授
KAJINO Fumiyoshi  Lecturer, Faculty of Science, Konan Univ., 理学部, 講師 (50204392)
SAKATA Michinori  Professor, Faculty of Science, Konan Univ., 理学部, 教授 (60068111)
SHIBATA Makio  Associate Prof., Faculty of Education, Yokohama National Univ., 教育学部, 助教授 (50018016)
TORII Shoji  Assistant, Faculty of Engineering, Kanagawa Univ., 工学部, 助手 (90167536)
MIZUTANI Kouhei  Associate Prof., Faculty of Science, Saitama Univ., 理学部, 助教授 (60008844)
HOTTA Naoki  Assistant, Faculty of Education, Utsunomiya Univ., 教育学部, 助手 (60157039)
OHTA Itaru  Professor, Faculty of Education, Utsunomiya Univ., 教育学部, 教授 (30008023)
NANJO Hirotada  Associate Prof., Faculty of Science, Hirosaki Univ., 理学部, 助教授 (00106840)
KASAHARA Katsuaki  Assistant, Institute For Cosmic Ray Research, Univ. of Tokyo, 宇宙線研究所, 助手 (00013425)
REN Jing-ru  Professor, Institute of High Energy Physics, Academia Sinica
Project Period (FY) 1989 – 1990
Project Status Completed (Fiscal Year 1990)
Budget Amount *help
¥6,000,000 (Direct Cost: ¥6,000,000)
Fiscal Year 1990: ¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 1989: ¥3,000,000 (Direct Cost: ¥3,000,000)
KeywordsAir shower array / Yangbajing / Gamma ray point source / Fast timing / Scintillation counter / TKO / Cyg. X-3
Research Abstract

A new air shower experiment, aiming to search for celestial gamma ray point sources, has been started from 1989 with Chinese scientists at Yangbajing (4,300m a. s. l., 90.5^゚E and 30.1^゚N) in Tibet. The present array consists of 49 scintillation counters for fast timing (FT), each of which has an area of 0.5 m^2 and is placed in a grid pattern with a spacing of 15 m. Other 16 density counters surround the FT counter array to select the showers whose core fall inside the array. The TKO and CAMAC system, controlled by a 32 bit micro-computer, is employed in this experiment. The data are recorded on a 8 mm video tape of about 2 GB capacity. A Rb clock with a stability of <54 mus/month is equipped to receive the arrival time of air showers precisely. The operation, atarted fully from June of 1990, is now successively continued with a high trigger rate of about 20 Hz to search for gammaray point sources in the energy region lower than 100 TeV. For the time being, only our array can detect s … More uch rather low energy gamma-rays effectively, since the observation site is located at high altitude.
The performance of the present array was examined by using the experimental data, comparing those with a Monte Carlo simulation. This shows that the arrival direction of air showers can be determined with an angular resolution of about 0.5^゚ at 100 TeV. Also the energy resolution is estimated to be about 30% for a 100 TeV gamma ray. The detectable shower energy is estimated to be about 20 TeV, and the non-bias energy corresponds to about 40 TeV for gamma ray showers. Our experiment is therefore considered to have a distinctive feature among a lot of air shower arrays working now in the world, giving a capability of observing gamma ray point sources in the several 10 TeV energy region where both of mirror and array experiment on the ground are inaccessible.
We still need to operate this array at least for more than one year to examine whether Cyg. X-3 and other point source candidates really emit high energy gamma rays steadily or not. The first result will be given in this fall. Less

Report

(1 results)
  • 1990 Final Research Report Summary
  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] 霍安 祥 他: "TIBETーASγ EXPERIMENT" 第21回宇宙線国際会議論文集. Vol.2. 427-430 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 日比野 欣也 他: "A new project to search for high energy gamma-ray point sources in Tibet" Nuclear Physics B. 10B. 219-227 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 西沢 正己 他: "A monitering system of the fast-timing scintillation counters used for detection of air showers" Nuclear Instruments and Methods. A285. 532-539 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 雨森 道紘 他: "Development and a performance test of a prototype air shower array for search for gamma-ray point sources in the very high energy region" Nuclear Instruments and Metuhods. A288. 619-631 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 雨森 道紘 他: "Status and performance of the AS array of the Tibet ASγ experiment," AIP国際会議論文集(米国物理学会). (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] A. X. Huo et al.: "Tibet AS gamma experiment" Proc. of 21st International Cosmic Ray Conf., Adelaide, 1990. 2. 427-430 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] K. Hibino et al.: "A new project to search for high energy gamma ray point sources in Tibet" Nuclear Physics B (Proc. Suppl). 10B. 219-227 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] M. Nishizawa et al.: "A monitoring system of the fast-timing scintillation counters used for detection of air showers" Nuclear Instruments and Methods. A285. 532-539 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] M. Amenomori et al.: "Development and a performance test of a prototype air shower array for search for gamma ray point sources in the very high energy region" Nuclear Instruments and Methods. A288. 619-631 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] M. Amenomori et al.: "Status and performance of the AS array of the Tibet AS gamma experiment" AIP Conference papers,. (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary

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Published: 1989-04-01   Modified: 2016-04-21  

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