• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Search for secular variations of in cosmic rays over the past 10 million years using muon-induced cosmogenic nuclides in deep underground granite rocks

Research Project

Project/Area Number 19K03882
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 15020:Experimental studies related to particle-, nuclear-, cosmic ray and astro-physics
Research InstitutionYamagata University

Principal Investigator

Sakurai Hirohisa  山形大学, 理学部, 客員教授 (60150265)

Co-Investigator(Kenkyū-buntansha) 堀内 一穂  弘前大学, 理工学研究科, 准教授 (00344614)
湯口 貴史  熊本大学, 大学院先端科学研究部(理), 教授 (00516859)
Project Period (FY) 2019-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2020: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2019: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywords宇宙線 / 宇宙線生成核種 / ミューオン / 宇宙線永年変化 / 花崗岩 / AMS分析 / 高エネルギーミューオン / 永年変化
Outline of Research at the Start

約7千万年前に形成され、隆起・沈降後1千万年前に現在の状態に安定した土岐花崗岩は、1千万年の間、地球に入射してくる銀河宇宙線が大気中で生成した高エネルギーミュー中間子の照射を受けて生成されBe-10、Al-26を蓄積している。その宇宙線生成核種の測定は過去1千万年にわたる宇宙線強度変動を直接的に観測する唯一の手段であり、未知の領域である宇宙線スペクトルの長期変動の直接的探索である。

Outline of Final Research Achievements

We have measured the Be-10 and Al-26 (with respective half-lives of 1.36 × 10^6 yr and 7.2 × 10^5 yr) concentrations in boring core samples from the Toki Granite down to a depth of 100 m, using AMS analysis. We, also, have determined the production cross-sections of Be-10 and Al-26 in the granite quartz by a 160 GeV muon beam exposure experiment, compared with a detailed simulation. Additionally, the depth profiles of Be-10 and Al-26 concentrations in rocks estimated from the known total muon flux deep underground and this study’s cross sections were comparable to those of the concentrations measured at depths greater than 5 m. Overall, our study showed that these cross sections revealed by the high-energy muon beam experiment are a valuable tool for estimating variations in high-energy galactic cosmic rays over a few million years using in situ rocks and simulators.

Academic Significance and Societal Importance of the Research Achievements

本研究の100 mの深度での実験データは、国際的に見ても1例程度の先行研究しかない。さらに世界的にみても例をみない3次元的岩石情報を取得している土岐花崗岩体からの単一ボーリングコア試料による系統的分析測定結果は本研究が唯一のものである。本実験研究で導出した生成断面積は、世界に先駆けたデータであり学術的に大きな意義がある。また、高エネルギー宇宙線により過去1千万年の銀河の様子を調べることは社会文化的貢献でもある。

Report

(6 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (20 results)

All 2024 2023 2022 2021 2020 2019

All Journal Article (7 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 7 results,  Open Access: 2 results) Presentation (13 results) (of which Int'l Joint Research: 1 results,  Invited: 2 results)

  • [Journal Article] Production rates of long-lived radionuclides 10Be and 26Al under direct muon-induced spallation in granite quartz and its implications for past high-energy cosmic ray fluxes2024

    • Author(s)
      H. Sakurai, Y. Kurebayashi, S. Suzuki , K. Horiuchi , Y. Takahashi, N. Doshita, S. Kikuchi , F. Tokanai, N. Iwata , Y. Tajima, S. Gunji , E. Inui, K. Kondo, T. Oe, N. Sasaki, S. Abe, T. Sato, H. Matsuzaki, V. Vlachoudis
    • Journal Title

      PHYSICAL REVIEW D

      Volume: 109 Issue: 10

    • DOI

      10.1103/physrevd.109.102005

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Crystallization processes of quartz in a granitic magma: Implications for the magma chamber processes of Okueyama granite, Kyushu, Japan2024

    • Author(s)
      Yuguchi Takashi、Kato Takenori、Ogita Yasuhiro、Watanabe Minori、Yamazaki Hayoto、Kato Asuka、Itoh Daichi、Yokoyama Tatsunori、Sakata Shuhei、Ohno Takeshi
    • Journal Title

      Journal of Asian Earth Sciences

      Volume: 265 Pages: 106091-106091

    • DOI

      10.1016/j.jseaes.2024.106091

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Morphological and chemical characterization of secondary carbonates in the Toki granite, central Japan, and the evolution of fluid chemistry2022

    • Author(s)
      Yuguchi, T., Hatsukawa, H., Suzuki, S., Imura, Motai, S., T., Nakashima, K., Nishiyama, T.
    • Journal Title

      American Mineralogist

      Volume: 107 Issue: 12 Pages: 2282-2290

    • DOI

      10.2138/am-2022-8229

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Mass transfer associated with chloritization in the hydrothermal alteration process of granitic pluton.2021

    • Author(s)
      2.Yuguchi, T., Matsuki, T., Izumino, Y., Sasao, E. and Nishiyama, T.
    • Journal Title

      American Mineralogist

      Volume: 106 Pages: 1128-1142

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Prolonged production of 14C during the ~660 BCE solar proton event from Japanese tree rings2020

    • Author(s)
      Sakurai Hirohisa、Tokanai Fuyuki、Miyake Fusa、Horiuchi Kazuho、Masuda Kimiaki、Miyahara Hiroko、Ohyama Motonari、Sakamoto Minoru、Mitsutani Takumi、Moriya Toru
    • Journal Title

      Scientific Reports

      Volume: 10 Issue: 1 Pages: 1-7

    • DOI

      10.1038/s41598-019-57273-2

    • Related Report
      2020 Research-status Report 2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Measurements of beryllium isotopes in ice wedges in Alaska2019

    • Author(s)
      Horiuchi Kazuho、Ohno Hiroshi、Iwahana Go、Iizuka Yoshinori、Matsuzaki Hiroyuki
    • Journal Title

      Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms

      Volume: 459 Pages: 64-70

    • DOI

      10.1016/j.nimb.2019.07.046

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Role of micropores, mass transfer, and reaction rate in the hydrothermal alteration process of plagioclase in a granitic pluton2019

    • Author(s)
      Yuguchi, T., Shoubuzawa, K., Ogita, Y., Yagi, K., Ishibashi, M., Sasao, E., Nishiyama, T.
    • Journal Title

      American Mineralogist

      Volume: 104 Pages: 536-556

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] 高エネルギーミューオンによる長半減期宇宙線生成核種Be-10,Al-26の花崗岩石英中の生成率と地下花崗岩における濃度の深度分布2024

    • Author(s)
      櫻井敬久, 紅林泰, 鈴木颯一郎, 堀内一穂, 高橋唯, 堂下典弘, 菊地聡, 門叶冬樹,岩田尚能, 田島靖久, 郡司修一, 乾恵美子, 近藤薫, 大江毅, 佐々木宣欣,安部晋一郎, 佐藤達彦, 松崎浩之, Vlachoudis Vasilis
    • Organizer
      日本物理学会2024春季大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 高エネルギーミューオンによる長半減期宇宙線生成核種 Be-10,Al-26の花崗岩における生成率2024

    • Author(s)
      櫻井敬久
    • Organizer
      第 24 回 AMS シンポジウム
    • Related Report
      2023 Annual Research Report
  • [Presentation] 土岐花崗岩における物質移行特性に関する研究:鉱物の微小空隙がもたらす物質移動の遅延2023

    • Author(s)
      湯口貴史,笹尾英嗣,火原諒子,村上裕晃,尾崎裕介
    • Organizer
      日本地質学会2023年年会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 2000年から23年間の大気中宇宙線生成核種Be-7濃度変動の観測2023

    • Author(s)
      櫻井敬久、川村容明、鈴木颯一郎、乾恵美子、門叶冬樹、 森谷透、武山美麗 他
    • Organizer
      日本物理学会 2023年春季大会
    • Related Report
      2022 Research-status Report
  • [Presentation] 地下深部土岐花崗岩コア中の長半減期宇宙線生成核種Be-10の測定II2021

    • Author(s)
      櫻井敬久、堀内一穂、鈴木颯一郎、岩田尚能、湯口貴史、門叶冬樹、松崎浩之
    • Organizer
      日本物理学会2021秋季大会online(2021/9/16)
    • Related Report
      2021 Research-status Report
  • [Presentation] Be-7 in Japan, Iceland and Thailand during solar cycle 24 descent phase2021

    • Author(s)
      H. Sakurai, Y. Kawamura, F. Tokanai, et al.
    • Organizer
      JPGU meeting 2021 online PEM08-P11 June3-6 e-poster
    • Related Report
      2021 Research-status Report
  • [Presentation] 多数試料Be同位体分析による古宇宙線変動の解明と古記録間の同期2021

    • Author(s)
      堀内一穂
    • Organizer
      日本地球化学会第68回年会,ハイブリッド開催 2021年9月1日-9月15日
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] 花崗岩中の割れ目発生・発達プロセスの解明:熱水変質を指標としたアプローチ[R6P-04]2021

    • Author(s)
      湯口貴史,笹尾英嗣,五十公野裕也
    • Organizer
      日本鉱物科学会 2021年年会
    • Related Report
      2021 Research-status Report
  • [Presentation] 14C during the ~660 BCE solar proton event from Japanese tree rings2020

    • Author(s)
      Hirohisa Sakurai, Fusa Miyake, Fuyuki Tokanai, Kazuho Horiuchi, et al.
    • Organizer
      JpGU-AGU Joint meeting 2020
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Yearly variations in Be-7 concentrations in the surface air at Iceland and Japan for 16 years from 20032020

    • Author(s)
      H. Sakurai, Y. Kawamura, F. Tokanai, et al.
    • Organizer
      11th Symposium on Polar Science online meeting
    • Related Report
      2020 Research-status Report
  • [Presentation] 中部日本土岐花崗岩体に生じる熱水変質 ―炭酸塩鉱物の産状区分に基づくCL像観察と化学的特徴―2020

    • Author(s)
      初川悠,中島和夫,湯口貴史
    • Organizer
      日本鉱物科学会
    • Related Report
      2020 Research-status Report
  • [Presentation] 花崗岩体の石英の結晶化プロセス:石英のCL累帯パターンとTitaniQ温度計2019

    • Author(s)
      湯口貴史,小北康弘,加藤丈典,横田倫太郎,笹尾英嗣,西山忠男
    • Organizer
      日本鉱物科学会 2019年年会
    • Related Report
      2019 Research-status Report
  • [Presentation] Yearly variations in Be-7 concentrations in surface air at Iceland and Japan for 15 years from 2003: Solar modulation of cosmogenic nuclide2019

    • Author(s)
      H. Sakurai, Y. Kawamura, F.Tokanai, et al.
    • Organizer
      第10回極域科学シンポジウム
    • Related Report
      2019 Research-status Report

URL: 

Published: 2019-04-18   Modified: 2025-01-30  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi