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2002 Fiscal Year Final Research Report Summary

Fluorescence efficiency of electrons in the atmosphere above oceans

Research Project

Project/Area Number 12440068
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 InstitutionFukui University of Technology

Principal Investigator

NAGANO Motohiko  Fukui University of Technology, Professor, 工学部, 教授 (00013384)

Co-Investigator(Kenkyū-buntansha) KOBAYAKAWA Keizo  Fukui University of Technology, Professor, 工学部, 教授 (00031287)
Project Period (FY) 2000 – 2002
Keywordscosmic rays / extensive air shower / fluorescence efficiency / ultrahigh-energy / international space station / 窒素ガス発光効率
Research Abstract

In order to detect ultrahigh-energy cosmic rays (UHECR), atmospheric fluorescence light from the trajectory of the extensive air shower may be measured by mirror-photosensor systems. In this type of experiment the photon yield from electrons exciting air of various densities and temperatures is most fundamental to estimate the primary energy of UHECR. An experiment has been undertaken using a ^<90>Sr β source to study the pressure dependence of photon yields, and the life times of the excited states, for radiation in nitrogen and dry air. The photon yield between 300nm and 406nm in air excited by 0.85 MeV electrons is 3.734±0.148 photons per meter at 1000 hPa and 20℃. This result has been submitted to Astroparticle Physics for publication. Effects to the fluorescence efficiency by water vapour in air is now under investigation.

  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] N.Nagano, K.Kobayakawa, N.Sakaki, K.Ando: "Photon yields from nitrogen gas and dry air excited by electrons"astro-ph/0303193 ; (Astroparticle Physics). (submitted). (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Nagano: "Ultrahigh-energy Cosmic Rays : Results from Akeno Giant Air Shower Array and 1km^2 Array"Proc. of Int. Workshop on Extremely High Energy Cosmic Rays. (in print). (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Nagano: "Recent observational results on ultrahigh-energy cosmic rays"Proc. of 21th Symposium on relativistic astrophysics. (in print). (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Nagano, K.Kobayakawa, N.Sakaki: "Fluorescence efficiency of electrons in the atmosphere above oceans"Proc. of 27th Int. Cosmic Ray Conf., Hamburg. 1. 675-678 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Nagano: "Historical review on ultrahigh-energy cosmic ray experiment"Journal of Physical Society of Japan. 70 Suppl.B. 1-8 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M. Nagano, K. Kobayakawa, N. Sakaki and K. Ando: "Photon yields from nitrogen gas and dry air excited by electrons"astro-ph/0303193 (submitted to Astroparticle Physics). (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Nagano, K. Kobayakawa and N. Sakaki: "Fluorescence efficiency of electrons in the atmosphere above oceans"Proc of 27th International Cosmic Ray Conference, Hamburg. 675-678 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Nagano: "Historical review on ultrahigh-energy cosmic ray experiment"Journal of Physical Society of Japan. 70 (Suppl. B). 1-8 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Nagano: "Ultrahigh-energy cosmic rays ; Results from Akeno Giant Air Shower Array and 1 sq-km, Proc. Of International Workshop on Extremely High Energy Cosmic Rays"Universal Academy Press, inc. (in print). (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Nagano: "Recent observational results on ultrahigh energy cosmic rays, Proc. Of 21th Symposium on Relativistic Astrophysics"World Scientific Publishing Co., Inc. (in print). (2003)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2004-04-14  

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