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New picture of solar system and outer rim objects opened by nuclear gamma imaging observation

Research Project

Project/Area Number 20K20428
Project/Area Number (Other) 19H05500 (2019)
Research Category

Grant-in-Aid for Challenging Research (Pioneering)

Allocation TypeMulti-year Fund (2020)
Single-year Grants (2019)
Review Section Medium-sized Section 16:Astronomy and related fields
Research InstitutionKyoto University

Principal Investigator

Tanimori Toru  京都大学, 理学研究科, 教授 (10179856)

Project Period (FY) 2019-06-28 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥22,620,000 (Direct Cost: ¥17,400,000、Indirect Cost: ¥5,220,000)
Fiscal Year 2021: ¥7,670,000 (Direct Cost: ¥5,900,000、Indirect Cost: ¥1,770,000)
Fiscal Year 2020: ¥7,670,000 (Direct Cost: ¥5,900,000、Indirect Cost: ¥1,770,000)
Fiscal Year 2019: ¥7,280,000 (Direct Cost: ¥5,600,000、Indirect Cost: ¥1,680,000)
Keywordsガンマ線イメージング分光 / 元素合成 / 月面資源探査 / 電子飛跡検出型コンプトンカメラ / コンプトン散乱 / 機械学習 / 銀河拡散ガンマ線 / 元素分析 / Deep Leaning / 太陽系外縁部 / ETCC / MeVガンマ線天文学 / 田被飛跡検出型コンプトンカメラ(ETCC) / 宇宙背景拡散MeVガンマ線 / 義眼中心拡散ガンマ線 / カニ星雲 / 気球実験 / 核ガンマ線スぺクトロスコピー
Outline of Research at the Start

太陽系では宇宙線と天体の衝突で発生するγ線を画像計測して外縁部小天体群を観測する手法を開拓する。また核γ線の特徴を生かし月等岩石惑星の元素分布測定の可能性を探る。我々は核γ線のコンプトン散乱を再構成する電子飛跡検出コンプトンカメラ(ETCC)を開発、核γ線画像分光を可能にすることで従来の観測手法より3桁高感度を実現、このような計測可能性をETCCの実測性能を踏まえてシミュレーションで検討する

Outline of Final Research Achievements

We have studied the possibility of the both observations of asteroid groups in the solar system and the chemical elements on the surfaces of rocky planets such as Moon by measuring spectroscopic images of γ-rays generated by collisions between cosmic rays and astronomical objects.
We developed the electron track detecting Compton camera (ETCC), which can determine the direction of nuclear gamma rays completely, and succeeded MeV gamma ray imaging spectroscopy for the first time in the world. Based on the observed galactic plane gamma rays in 2018 balloon observation, we improved PSF, which represents the gamma-ray collectivity, by using Deep Learning approach. Then the understanding of background gamma rays has been improved, and hence the experimental results could be reproduced independently from the cosmic-ray atmospheric gamma ray model and background gamma ray simulations, which verify the first direct detection of cosmic nuclear gamma rays exceeding over the background.

Academic Significance and Societal Importance of the Research Achievements

今まで核γ線の天体観測は50年以上前から注目されながら、ガンマ線方向測定が不可能だったため進展が非常に遅れていた。今回の成果は初めて完全な核γ線可視化を実現、これにより、2桁近く雑音低減に成功し宇宙からの核γ線の直接観測に成功、初めて銀河からのγ線画像を得ることで実証した。
これにより核γ線宇宙観測も他の天文学同様、幾何光学に基づく画像解析が可能となり、大きな発展が世界で初めて担保された。これより本申請の月面での元素の画像による資源探査も可能となる。さらに核ガンマ線を利用する全分野にイメージング分光技術の導入が可能となり、飛躍的進展が期待される。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Annual Research Report
  • Research Products

    (11 results)

All 2022 2021 2020 2019 Other

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 2 results) Presentation (6 results) (of which Int'l Joint Research: 3 results) Remarks (3 results)

  • [Journal Article] Development of Convolutional Neural Networks for an Electron-Tracking Compton Camera2021

    • Author(s)
      T.Ikeda, T.Tanimori et al.
    • Journal Title

      Progress of Theoretical and Experimental Physics

      Volume: 2021(8) Issue: 8

    • DOI

      10.1093/ptep/ptab091

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] MeV Gamma-ray imaging spectroscopic observation for Galactic Centre and Cosmic Background MeV gammas by SMILE-2+ Balloon Experiment2020

    • Author(s)
      T.Tanimori
    • Journal Title

      Journal of Physics: Conference Series

      Volume: 1468 Issue: 1 Pages: 012046-012046

    • DOI

      10.1088/1742-6596/1468/1/012046

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] SMILE61:2018年豪州気球実験SMILE2+におけるバックグランド2022

    • Author(s)
      池田 智法
    • Organizer
      日本物理学会第77回年次大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] SMILE56: MeVガンマ線観測実験 SMILE-2+の解析の現状報告2021

    • Author(s)
      池田 智法
    • Organizer
      日本物理学会第76回年次大会
    • Related Report
      2021 Annual Research Report 2020 Research-status Report
  • [Presentation] SMILE55:機械学習によるETCC検出器の点源分解能の改善2020

    • Author(s)
      池田 智法
    • Organizer
      日本物理学会 2020年秋季大
    • Related Report
      2020 Research-status Report
  • [Presentation] MeV Gamma-ray imaging spectroscopic observation for Galactic Center and Cosmic Background MeV gammas by SMILE-2+ Balloon Experiment2019

    • Author(s)
      谷森達
    • Organizer
      Topics in Astroparticle and Underground Physics 2019 (TAUP2019)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Imaging Observation for Cosmic MeV g Background and Gala1 ctic Diffuse MeV g by SMILE2+ balloon-bore experiment2019

    • Author(s)
      谷森達
    • Organizer
      The 2019 TeV Particle Astrophysics conference
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] New observation for MeV gamma spectra and distributions of both Galactic Center and Cosmic Background MeV gammas by SMILE2+ balloon-borne experiment2019

    • Author(s)
      谷森達
    • Organizer
      30th Texas Symposium on Relativistic Astrophysics
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Remarks] SMILE Project

    • URL

      http://kurs10699.sakura.ne.jp/MeV/wiki.cgi

    • Related Report
      2021 Annual Research Report
  • [Remarks] SMILE Project

    • URL

      http://www-cr.scphys.kyoto-u.ac.jp/research/MeV-gamma/wiki/wiki.cgi

    • Related Report
      2020 Research-status Report
  • [Remarks] SMILEプロジェクト

    • URL

      http://www-cr.scphys.kyoto-u.ac.jp/research/MeV-gamma/wiki/wiki.cgi

    • Related Report
      2019 Annual Research Report

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Published: 2019-07-04   Modified: 2024-03-26  

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