2023 Fiscal Year Final Research Report
Measurement of high-intensity muons on the next-generation neutrino experiment
Project/Area Number |
21K03591
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Review Section |
Basic Section 15020:Experimental studies related to particle-, nuclear-, cosmic ray and astro-physics
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Research Institution | Osaka Metropolitan University (2022-2023) Osaka City University (2021) |
Principal Investigator |
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Project Period (FY) |
2021-04-01 – 2024-03-31
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Keywords | 電子増倍管 / ニュートリノ / ミューオン |
Outline of Final Research Achievements |
The long baseline neutrino experiment, T2K, is being upgraded aiming at observation of CP violation in the neutrino sector toward understanding the current matter dominated universe. Among upgrade of the experiment, the muon monitor (MUMON) which is making the real-time monitoring of the direction of the neutrino beam to the Super-Kamiokande detector from J-PARC is also one of the subjects for upgrade since the present detectors cannot be tolerated for the further accelerator upgrade, and so the electron multiplier tube (EMT) is newly being developed as a replacement. The fact that the EMT has a sufficient radiation tolerance and a good linearity of the signal response has been confirmed by the test experiment using a high-intensity electron beam, and seven EMTs installed at J-PARC showed a good performance comparable to the present MUMON detectors.
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Free Research Field |
素粒子物理学
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Academic Significance and Societal Importance of the Research Achievements |
物質優勢宇宙誕生の謎を解くことは、現代物理学の最重要課題の1つである。それには素粒子のCP対称性の破れが必要であるが、測定の結果クォーク以外の源が必要と判明し、我々はT2Kニュートリノ振動実験でニュートリノのCP対称性の破れの発見を目指している。T2K実験の重要検出器の1つにニュートリノの発射方向を測定するミューオンモニターがあるが、ビーム強度増強による放射線増加により新たな検出器が必要となり、電子増倍管(EMT)を開発した。テスト実験の結果、EMTが将来に渡って十分な放射線耐性と優秀な性能を有していることを確認できた。これはニュートリノのCP対称性の破れの発見可能性を確かにする意義がある。
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