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STUDY OF COSMIC GAMMA RAYS AND NUCLEAR INTERACTIONS WITH AIR SHOWERS OBSERVED AT MT.CHACALTAYA

Research Project

Project/Area Number 63043010
Research Category

Grant-in-Aid for Overseas Scientific Research

Allocation TypeSingle-year Grants
SectionField Research
Research InstitutionSaitama University

Principal Investigator

MATANO Tsuneo  Faculty of Science, Saitama University, Professor, 理学部, 教授 (60008802)

Co-Investigator(Kenkyū-buntansha) INOUE Naoya  Faculty of Science, Saitama University, Research Associate, 理学部, 助手 (40168456)
SASAKI Hiroshi  Faculty of Science, Koch University, Professor, 理学部, 教授 (80036566)
HONDA Ken  Faculty of Education, Yamanashi University, Associate Professor, 教育学部, 助教授 (10115321)
KAWASUMI Norio  Faculty of Education, Yamanashi University, Associate Professor, 教育学部, 助教授 (40020416)
TSUSHIMA Itsuro  Faculty of Education, Yamanashi University, Associate Professor, 教育学部, 助教授 (30020366)
Project Period (FY) 1987 – 1988
Project Status Completed (Fiscal Year 1988)
Budget Amount *help
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1988: ¥1,900,000 (Direct Cost: ¥1,900,000)
KeywordsHadron / Air shower / Gamma ray / Emulsion / エマルション / チャカルタヤ
Research Abstract

We are observing the hadronless air showers above 10^<14>eV in order to search gamma-rays from point sources and diffused gamma-rays. phase analysis has been done on hadronless air showers from directions of various point sources(ScoX-1.VelaX-1.SS433.V1223SGR.SN1987a.etc.). observed at Mt.Chacaltaya from 1986 Feb. to 1987 Mar. We could not find any significant excess for these sources. However. we have found a short period excess from ScoX-1 in the latter half of May of 1986. According to the X^2 test for the phase distribution. the probability of the ununiformity is 7.05x10^<-5>. Preliminary results on diffused gamma-rays shows that the excess of hadronless air showers from galactic center is about 3% compared with other directions.
Hadrons with energies above 1TeV in air shower cores were caluculated with three-dimensional Monte Carlo simulation in order to compare with our emulsion data observed with the hybrid method(air shower array + emulsion chamber). These caluculations have been done by a high multipicity model according to CKP model and by a model extrapolated from accelerator data. Our experimental results on energy spectrum and ER distributions of high energy hadrons are compared with ones expected from the present calculations.

Report

(1 results)
  • 1988 Final Research Report Summary
  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] 俣野恒夫: 20th International Conference on Cosmic Rays,Conf.Paper. 1. 290-293 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 丹羽光行: 20th International Conference on Cosmic Rays,Conf.Paper. 5. 481-484 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 俣野恒夫: 東京大学宇宙線研究所 研究報告. 164-88-10. 1-14 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Matano T.: "Search for Primary UHE Gamma-ray with Hadronless Air Shower at Mt.Chacaltaya" 20th International Conference on Cosmic Rays, Conf. paper. 1. 290-293 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Niwa M.: "Calculation of Average Characteristics of High Energy Gamma-rays and Hadrons in Air Shower Development" ICR-Report. 5. 481-484 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Matano T.: "Detection of High energy gamma-rays from Scorpius X-1 with Energies above 10^<14>eV" 20th International Conference on Cosmic Rays, Conf. paper. 164-88-10. 1-14 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary

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Published: 1988-04-01   Modified: 2016-04-21  

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