| Project/Area Number |
07454047
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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 | The University of Tokyo |
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Principal Investigator |
ORITO Shuji The University of Tokyo Faculty of Science, Professor, 大学院・理学系研究科, 教授 (10092173)
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| Co-Investigator(Kenkyū-buntansha) |
YOSHIDA Tetsuya High Energy Accelerator Research Organization, Institute of Particle and Nuclear, 素粒子原子核研究所, 助教授 (50222394)
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥7,700,000 (Direct Cost: ¥7,700,000)
Fiscal Year 1996: ¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 1995: ¥4,500,000 (Direct Cost: ¥4,500,000)
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| Keywords | Atmospheric Neutrino / Primary Proton Flux / Muon Flux / BESS Spectrometer / エアロジェルチェレンコフカウンタ / 一次宇宙線陽子スペクトラム |
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| Research Abstract |
In order to determine the absolute flux of the atmospheric neutrinos, the following studies were carried out :
(1)A shower counter system and an Aerogel Cherenkov counter system were developed and constructed to improve the particle identification capability of the BESS superconducting spectrometer.
(2)A balloon-borne experiment was carried out in the summer, 1995 in northern Canada to measure spectra of primary cosmic rays. Energy spectrum of protons in the energy region from 0.4 to 100 GeV was obtained with an estimated systematic accuracy of 10%. The effect of solar modulation was also clearly observed.
(3)Measurements of cosmic ray muon spectrum were performed in Japan and northern Canada in the winter, 1995, and the summer, 1996, respectively. Cosmic ray muon energy spectra in the momentum range between 0.4 and 100 GeV/c were obtained with a systematic accuracy of 2%.
(4)A simulation program for interactions between primary cosmic rays and the air has been developed.
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