Optimizing the XENON Dark Matter sensitivity with Kamioka expertise
| Project/Area Number |
18KK0082
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| Research Category |
Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))
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| Allocation Type | Multi-year Fund |
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| Review Section |
Medium-sized Section 15:Particle-, nuclear-, astro-physics, and related fields
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| Research Institution | The University of Tokyo |
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Principal Investigator |
Takeda Atsushi 東京大学, 宇宙線研究所, 准教授 (40401286)
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| Co-Investigator(Kenkyū-buntansha) |
MARTENS Kai 東京大学, カブリ数物連携宇宙研究機構, 准教授 (20535025)
風間 慎吾 名古屋大学, 高等研究院(素粒子), 特任助教 (40736592)
伊藤 好孝 名古屋大学, 宇宙地球環境研究所, 教授 (50272521)
森山 茂栄 東京大学, 宇宙線研究所, 教授 (50313044)
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| Project Period (FY) |
2019-02-07 – 2022-03-31
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| Project Status |
Completed (Fiscal Year 2021)
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| Budget Amount *help |
¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000)
Fiscal Year 2020: ¥6,630,000 (Direct Cost: ¥5,100,000、Indirect Cost: ¥1,530,000)
Fiscal Year 2019: ¥6,630,000 (Direct Cost: ¥5,100,000、Indirect Cost: ¥1,530,000)
Fiscal Year 2018: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
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| Keywords | 暗黒物質 / 中性子バックグラウンド / 反同時計測 / ガドリニウム / 中性子捕獲反応 / 水チェレンコフ |
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| Outline of Final Research Achievements |
We manufactured, installed, and calibrated a neutron counter (nVeto) that reduces the neutron background of the XENONnT experiment for direct dark matter search using liquid xenon in the underground laboratory of Gransasso National Laboratory, Italy, and significantly improves the detection sensitivity. In particular, on-site performance tests of the optical sensors that make up the nVeto, establishment and implementation of a method for disabling the welded parts when installing the nVeto in the water tank, and installation of a gadolinium water purification system outside the tank were carried out. Data acquisition for dark matter search with the world's highest sensitivity was carried out, and data analysis was proceeded.
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| Academic Significance and Societal Importance of the Research Achievements |
最新の宇宙背景放射の観測結果から、宇宙全体のエネルギーのうち通常の物質はわずか4.9%しかなく、暗黒物質がその5倍以上である 27% を占めていることが高い精度で明らかになってきている。一方で、素粒子物理学の標準理論が内包する様々な問題を解決するための新粒子が暗黒物質の有力候補として挙がっており、暗黒物質の発見は宇宙物理学・素粒子物理学の両方の発展への大きな寄与が期待されている。本研究は、その暗黒物質が検出器内で直接反応するさいに出す信号を世界最高感度でとらえることを目的としており、そのための大統計データをバックグラウンドを除去しながら取得した。
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Report
(5 results)
Research Products
(31 results)
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[Journal Article] 222Rn emanation measurements for the XENON1T experiment2021
Author(s)
E. Aprile, ..., Y. Itow, ..., S. Kazama, ..., K. Martens, ..., S. Moriyama, ..., A. Takeda, ..., et. al. (XENON Collaboration)
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Journal Title
Eur. Phys. J. C 81:337 (2021) pp1-14
Volume: C 81:337
Issue: 4
Pages: 1-14
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] Search for Coherent Elastic Scattering of Solar B8 Neutrinos in the XENON1T Dark Matter Experiment2021
Author(s)
E. Aprile, ..., Y. Itow, ..., S. Kazama, ..., K. Martens, ..., S. Moriyama, ..., A. Takeda, ..., et. al. (XENON Collaboration)
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Journal Title
Physical Review Letters
Volume: 126
Issue: 9
Pages: 091301-091301
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] Search for inelastic scattering of WIMP dark matter in XENON1T2021
Author(s)
E. Aprile, ..., Y. Itow, ..., S. Kazama, ..., K. Martens, ..., S. Moriyama, ..., A. Takeda, ..., et. al. (XENON Collaboration)
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Journal Title
Physical Review D
Volume: 103
Issue: 6
Pages: 063028-063028
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] Projected WIMP sensitivity of the XENONnT dark matter experiment2020
Author(s)
E. Aprile, ..., Y. Itow, ..., S. Kazama, ..., K. Martens, ..., S. Moriyama, ..., A. Takeda, ..., et. al. (XENON Collaboration)
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Journal Title
Journal of Cosmology and Astroparticle Physics
Volume: 2020
Issue: 11
Pages: 031-031
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] Excess electronic recoil events in XENON1T2020
Author(s)
E. Aprile, ..., Y. Itow, ..., S. Kazama, ..., K. Martens, ..., S. Moriyama, ..., A. Takeda, ..., et. al. (XENON Collaboration)
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Journal Title
Physical Review D
Volume: 102
Issue: 7
Pages: 072004-072004
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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