| Project/Area Number |
10640281
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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 | Aomori University |
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Principal Investigator |
MIDORIKAWA Shoichi Aomori University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (00265133)
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| Project Period (FY) |
1998 – 2001
|
| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 2001: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 2000: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1999: ¥400,000 (Direct Cost: ¥400,000)
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| Keywords | neutrinos / neutrino oscillations / neutrino masses / atmospheric neutrinos |
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| Research Abstract |
The aim of the present research project is to calculate the flux of atmospheric neutrinos precisely to determine the masses and mixing angles of neutrinos using the data from water-Cerenkov experiments. During the term of this project we have carried out the following things.
(1) We have done the 3-dimensional calculation of atmospheric neutrino flux. We have also compared the result with that of 1-dimensional case, and find that the two results are very similar to each other except for nearly horizontal directions. For near-horizontal directions an enhancement of the neutrino flux is seen even at energies as large as 1 GeV in the case of 3-dimensinoal calculation.
(2) We have investigated the effect of matter enhanced oscillations of atmospheric neutrinos systematically in the framework of the one mass dominant model of three flavors. The resonance conditions of neutrinos crossing the earth are determined by the three parameters, namely, the zenith angle, Δm^2/E, and the mixing angle θ_3 of the electron neutrinos with tau neutrinos. We have given the values of the triplet parameters numerically, and discussed the feasibility to determine the mixing angle.
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