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Dark matter serach with high purity detector

Research Project

Project/Area Number 21H01104
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 15020:Experimental studies related to particle-, nuclear-, cosmic ray and astro-physics
Research InstitutionTohoku University

Principal Investigator

Haruo Ikeda  東北大学, ニュートリノ科学研究センター, 助教 (90400233)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥16,770,000 (Direct Cost: ¥12,900,000、Indirect Cost: ¥3,870,000)
Fiscal Year 2023: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2022: ¥8,580,000 (Direct Cost: ¥6,600,000、Indirect Cost: ¥1,980,000)
Fiscal Year 2021: ¥7,670,000 (Direct Cost: ¥5,900,000、Indirect Cost: ¥1,770,000)
Keywords宇宙暗黒物質 / 極低放射能環境 / 地下実験 / シンチレーター / NaI / シンチレーションフィルム / NaI結晶
Outline of Research at the Start

宇宙暗黒物質探索にむけて世界で最も放射性不純物の少ないNaI(Tl) 結晶とシンチレーションフィルムを組み合わせた検出器を開発する。宇宙暗黒物質の観測感度向上のためには、ハウジングなど検出器全体での背景事象源削減とその由来を特定できることが求められている。シンチレーターの発光時間特性の違いを利用することで検出器構造物由来の背景事象を特定できることを立証し、NaI(Tl)結晶が本来もつ観測感度での宇宙暗黒物質の探索可能性を明らかにする。

Outline of Final Research Achievements

Dark matter has been suggested to exist in the universe but is currently undetected, and its observation requires using detectors with minimal radioactive impurities in an environment with extremely low environmental radiation. In this study, we developed a new hybrid detector that combines ultra-pure NaI(Tl) crystals to detect reactions with dark matter and scintillating films to distinguish environmental radiation and detector structures. For this purpose, a new method was developed to observe the radiative contamination in the scintillating film with high sensitivity. Two types of hybrid detectors with different scintillating film thicknesses were fabricated, and their performance was observed in the lead shield at the Kamioka Underground Experimental Facility to evaluate their performance.

Academic Significance and Societal Importance of the Research Achievements

宇宙暗黒物質観測のための高純度NaI(Tl)結晶とシンチレーションフィルムを組み合わせたハイブリッド検出器の新規開発の結果、炭化水素フィルムに含まれる放射性不純物量のICP-MSを用いて高感度で測定する技術開発に成功した。検出器の性能評価をするのにノイズの影響が大きくその除去が重要であり、検出器を構成する部材の不純物含有量に加えて考慮すべき点があることが判明した。宇宙暗黒物質観測に欠かせない検出器の長期安定性の確認がなされた。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • Research Products

    (3 results)

All 2023

All Journal Article (3 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 3 results,  Open Access: 3 results)

  • [Journal Article] First measurement of the strange axial coupling constant using neutral-current quasielastic interactions of atmospheric neutrinos at KamLAND2023

    • Author(s)
      Abe S. et al (KamLAND Collaboration)
    • Journal Title

      Physical Review D

      Volume: 107 Issue: 7 Pages: 072006-072006

    • DOI

      10.1103/physrevd.107.072006

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Measurement of cosmic-ray muon spallation products in a xenon-loaded liquid scintillator with KamLAND2023

    • Author(s)
      Abe S. et al (KamLAND Collaboration)
    • Journal Title

      Physical Review C

      Volume: 107 Issue: 5 Pages: 054612-054612

    • DOI

      10.1103/physrevc.107.054612

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Development of a low-background HPGe detector at Kamioka Observatory2023

    • Author(s)
      Ichimura K、Ikeda H、Kishimoto Y、Kurasawa M、Suzuki A A、Gando Y、Ikeda M、Hosokawa K、Sekiya H、Ito H、Minamino A、Suzuki S
    • Journal Title

      Progress of Theoretical and Experimental Physics

      Volume: 2023 Issue: 12

    • DOI

      10.1093/ptep/ptad136

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research

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Published: 2021-04-28   Modified: 2025-01-30  

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