| Project/Area Number |
12440068
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
素粒子・核・宇宙線
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| Research Institution | Fukui University of Technology |
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Principal Investigator |
NAGANO Motohiko Fukui University of Technology, Professor, 工学部, 教授 (00013384)
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| Co-Investigator(Kenkyū-buntansha) |
KOBAYAKAWA Keizo Fukui University of Technology, Professor, 工学部, 教授 (00031287)
政池 明 福井工業大学, 工学部, 教授 (40022587)
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| Project Period (FY) |
2000 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥6,900,000 (Direct Cost: ¥6,900,000)
Fiscal Year 2002: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2001: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 2000: ¥4,800,000 (Direct Cost: ¥4,800,000)
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| Keywords | cosmic rays / extensive air shower / fluorescence efficiency / ultrahigh-energy / international space station / 窒素ガス発光効率 / 電子発光効率 / Cosmic ray / Extensive air shower / Fluorescence efficiency |
|---|
| 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.
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