2000 Fiscal Year Final Research Report Summary
Energy Spectrum of Primary Cosmic Rays
| Project/Area Number |
09640365
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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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 | EHIME UNIVERSITY |
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Principal Investigator |
YOSHII Hisashi EHIME UNIVERSITY, DEPARTMENT OF PHYSICS, PROFESSOR, 理学部, 教授 (00036360)
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| Co-Investigator(Kenkyū-buntansha) |
MIZUMOTO Yoshihiko NATIONAL ASTRONOMICAL OBSERVATORY, PROFESSOR, 教授 (20219653)
EZAWA Yasuo EHIME UNIVERSITY, DEPARTMENT OF PHYSICS, PROFESSOR, 理学部, 教授 (30036371)
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| Project Period (FY) |
1997 – 2000
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| Keywords | Very High Energy / Cosmic Ray / Energy Spectrum / Chemical Composition / Extensive Air Shower |
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| Research Abstract |
A compact air shower array to observe primary cosmic rays above a few TeV has been installed at Mt. Chacaltaya in Bolivia Since 1996. This array is available to observe the air showers above 6TeV and the longitudinal development curves above 50TeV.The purpose of the observations is to study the chemical composition and the energy spectrum of cosmic rays in the energy region including the "Knee" of the energy spectrum.
First, the consistency between direct measurements ( balloon-borne experiments) and air shower observations in the energy region from 50TeV to 80TeV is examined and confirmed. Next, the chemical composition and the energy spectrum are derived from the air shower observations. In the study, the longitudinal developments of shower particles are calculated by Monte Carlo simulations, assuming different chemical compositions above 80TeV.
The energy spectrum of cosmic rays in the energy region from 10TeV to 100PeV by air shower observations will be presented in near future.
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