2017 Fiscal Year Final Research Report
Probing the neutrino mass hierarchy with atmospheric neutrinos and developing the next-generation research frontier
| Project Area | Unification and Development of the Neutrino Science Frontier |
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| Project/Area Number |
25105004
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| Research Category |
Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
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| Allocation Type | Single-year Grants |
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| Review Section |
Science and Engineering
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
鈴木 州 神戸大学, 理学研究科, 助教 (20243298)
早戸 良成 東京大学, 宇宙線研究所, 准教授 (60321535)
横山 将志 東京大学, 大学院理学系研究科(理学部), 准教授 (90362441)
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| Co-Investigator(Renkei-kenkyūsha) |
TAKEUCHI Yasuo 神戸大学, 理学研究科, 教授 (60272522)
TANAKA Manobu 高エネルギー加速器研究機構, 素粒子原子核研究所, 教授 (00222117)
NAKAYAMA Shoei 東京大学, 宇宙線研究所, 准教授 (70401289)
SEKIYA Hiroyuki 東京大学, 宇宙線研究所, 准教授 (90402768)
WENDELL Roger 京都大学, 理学部, 准教授 (20647656)
ITOW Yoshitaka 名古屋大学, 宇宙地球環境研究所, 教授 (50272521)
MIURA Makoto 東京大学, 宇宙線研究所, 助教 (10272519)
KAMEDA Jun 東京大学, 宇宙線研究所, 助教 (70376648)
TANAKA Hidekazu 東京大学, 宇宙線研究所, 助教 (00402769)
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| Research Collaborator |
YAMATOMI Jiro
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| Project Period (FY) |
2013-06-28 – 2018-03-31
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| Keywords | ニュートリノ / 核子崩壊 / ニュートリノ天文学 |
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| Outline of Final Research Achievements |
We probed the neutrino mass hierarchy by using atmospheric neutrino data in Super-Kamiokande. Additional constraints from reactor, accelerator, and solar neutrino oscillation experiments are added to the atmospheric neutrino fit to give enhanced constraints. Over the range of parameters allowed at 90% confidence level, the normal mass hierarchy is favored by between 91.9% and 94.5%.
The Hyper-Kamiokande or Hyper-K, as a straightforward extension of the Super-Kamiokande, will provide major new capabilities to make new discoveries in particle and astroparticle physics thanks to an order of magnitude increase in detector mass and improvements in photon-detection system. The Hyper-K is now a priority project listed in the Roadmap2017 of the Japanese Ministry of Education, Culture, Sports, Science and Technology (MEXT). The principal project milestones include: Construction to start as early as in 2019, and Start data taking in 2026.
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| Free Research Field |
素粒子物理学（実験）
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