2005 Fiscal Year Final Research Report Summary
Progress in neutrino oscillation physics
| Project/Area Number |
15204016
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | The University of Tokyo |
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Principal Investigator |
KAJITA Takaaki The university of Tokyo, Institute for Cosmic Ray Research, Professor, 宇宙線研究所, 教授 (40185773)
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| Co-Investigator(Kenkyū-buntansha) |
KANEYUKI Kenji The University of Tokyo, Institute for Cosmic Ray Research, Associate Professor, 宇宙線研究所, 助教授 (30224629)
OKUMURA Kimihiro The university of Tokyo, Institute for Cosmic Ray Research, Research Associate, 宇宙線研究所, 助手 (70361657)
ITOW Yoshitaka Nagoya University, Solar-Terrestrial Environment Laboratory, Professor, 太陽地球環境研究所, 教授 (50272521)
KOBAYASHI Takashi High Energy Accelerator Research Organization, Institute of Particle and Nuclear Studies, Associate Professor, 素粒子原子核研究所, 助教授 (70291317)
SHIOZAWA Masato The University of Tokyo, Institute for Cosmic Ray Research, Associate Professor, 宇宙線研究所, 助教授 (70272523)
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| Project Period (FY) |
2003 – 2005
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| Keywords | Neutrino / Neutrino Oscillation |
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| Research Abstract |
A detailed study on the front detector system at the T2K experiment was carried out. T2K is a next generation neutrino oscillation experiment. Neutrinos are generated by the J-PARC accelerator and are detected in Super-Kamiokande. The experiment will start in 2009. One of the main goals of this experiment is the search for non-zero θ_<13>, which is one of the neutrino mixing angles and is not known yet. The front detector should be able to predict the neutrino energy spectrum and neutrino flavor without oscillation. Detailed Monte Carlo study concluded that a water Cherenkov detector with about 5000 20cm-diameter photomultipliers, located about 1.8km from the neutrino production target should have a sufficiently high performance for this experiment.
In addition, future possibilities with the T2K neutrino beam were studied. It was concluded that large water Cherenkov detectors located in Kamioka and in Korea should have a very high sensitivity to the measurement of the neutrino CP phase and mass hierarchy.
Studies of neutrino oscillations based on atmospheric neutrino events observed in Super-Kamiokande and K2K neutrino beam events were carried out. Various new results on neutrino masses and mixing angles were obtained. All the existing results are explained within the standard neutrino oscillation frame work.
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