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2023 Fiscal Year Final Research Report

Application of ultra-low background techniques to astro and particle physics experiments

Planned Research

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Project AreaUnraveling the History of the Universe and Matter Evolution with Underground Physics
Project/Area Number 19H05808
Research Category

Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

Allocation TypeSingle-year Grants
Review Section Science and Engineering
Research InstitutionYokohama National University

Principal Investigator

MINAMINO Akihiro  横浜国立大学, 大学院工学研究院, 教授 (70511674)

Co-Investigator(Kenkyū-buntansha) 田中 雅士  早稲田大学, 理工学術院, 主任研究員(研究院准教授) (30545497)
池田 一得  東京大学, 宇宙線研究所, 助教 (90583477)
竹田 敦  東京大学, 宇宙線研究所, 准教授 (40401286)
岩田 圭弘  国立研究開発法人日本原子力研究開発機構, 福島研究開発部門 福島研究開発拠点 廃炉環境国際共同研究センター, 研究副主幹 (20568191)
伊藤 主税  国立研究開発法人日本原子力研究開発機構, 安全・核セキュリティ統括本部, 次長 (90421768)
市村 晃一  東北大学, ニュートリノ科学研究センター, 助教 (80600064)
Project Period (FY) 2019-06-28 – 2024-03-31
Keywords極低放射能技術 / ゲルマニウム検出器 / ラドン検出器 / 環境中性子 / 希ガス微量分析 / 地下宇宙素粒子実験
Outline of Final Research Achievements

We developed a Ge detector with the world's lowest background level and proceeded to measure the radioactive impurity content in the detector materials of each experimental group. We also developed a radon detector for gadolinium sulfate water and started operating it with SK-Gd and XENONnT. We also measured the environmental neutron flux in the Kamioka underground laboratory for about two and a half years. Then, we measured Gd3+ luminescence in gadolinium sulfate water with laser-induced luminescence spectroscopy, demonstrating that it was not a problem for SK-Gd observations. We also set up a radioactive rare gas trace analysis device using laser resonance ionization spectroscopy. Finally, we held four workshops on Low-Background Technologies, where we exchanged information about the latest results of low-radioactivity technology development.

Free Research Field

宇宙素粒子実験

Academic Significance and Societal Importance of the Research Achievements

本研究の学術的意義は、本領域の各実験班が持つ世界最先端の低放射能技術を発展させ、その成果を領域全体の基盤技術としてすべての実験班に還元したことである。その結果として、各実験班が進める地下宇宙素粒子実験の探索感度向上を実現した。

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Published: 2025-01-30  

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