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Search for periodic variation of solar neutrino flux caused by g-mode oscillations in the Sun

Research Project

Project/Area Number 21K13942
Research Category

Grant-in-Aid for Early-Career Scientists

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

Principal Investigator

Nakano Yuuki  東京大学, 宇宙線研究所, 特任助教 (70781889)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2023: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2021: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywords太陽ニュートリノ / Super-Kamiokande / 太陽g-mode振動 / ラドン / 宇宙線ミューオン / g-mode振動 / 星辰学 / 太陽標準模型 / 太陽フレア / 星震学 / 惑星起源・進化
Outline of Research at the Start

太陽内部で生じているとされている太陽g-mode振動は存在が予言されているものの、未だに観測例の報告がない。これは、太陽内部の情報は、光学的に観測することができないことに由来する。したがって、本研究では、Super-Kamiokande実験で取得された太陽ニュートリノ観測データから、周期的な信号を探索することで、透過性の高いニュートリノを用いて太陽内部の運動(g-mode振動)のを探索することを試みる。最終的に、太陽ニュートリノの強度変化の振幅、太陽内部での振動現象の周期、核領域での密度変化、温度変化に関する研究成果を得ることを目標とする。

Outline of Final Research Achievements

Using the data of solar neutrino observations at the Super-Kamiokande detector, we have conducted a study to search for periodic variations in the intensity of solar neutrino originating from solar g-mode oscillations. In order to accomplish such a study, it is necessary to analyze the radioactive radon in pure water (Gd-dissolved water) and to evaluate radioactive materials (isotopes) induced by cosmic ray muons. In this study, a new fiber membrane module was developed and the measurement system was constructed. In addition, we measured the charge ratio of cosmic ray muons and evaluated the periodic fluctuation of cosmic ray muons. In the future, the physical sensitivity will be evaluated based on the findings of this study, and an actual g-mode oscillation search will be conducted.

Academic Significance and Societal Importance of the Research Achievements

太陽内部で生じているとされている太陽g-mode振動は存在が予言されているものの、光学的には未だに観測例の報告が無い。太陽ニュートリノを用いることで、光学的には観測することができない太陽内部を伝搬する太陽g-mode振動を探索できる可能性がある。本研究課題では、その探索に向けた基礎研究を実施した。今回の研究では、太陽ニュートリノ信号の周期的な変化を部分的に評価し、太陽g-mode振動探索にはさらなる放射性物質の評価が必要であることを示した。今後、太陽ニュートリノ観測を通して、太陽内部の運動や核融合反応の反応率など、太陽内部の情報を明らかにする研究につながると期待される。

Report

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

    (28 results)

All 2024 2023 2022 2021 Other

All Journal Article (7 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 7 results,  Open Access: 6 results) Presentation (18 results) (of which Int'l Joint Research: 8 results) Remarks (3 results)

  • [Journal Article] Solar neutrino measurements using the full data period of Super-Kamiokande-IV2024

    • Author(s)
      K. Abe, et al.
    • Journal Title

      Physical Review D

      Volume: 109 Issue: 9 Pages: 092001-092001

    • DOI

      10.1103/physrevd.109.092001

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Search for periodic time variations of the solar 8 B neutrino flux between 1996 and 2018 in Super-Kamiokande2024

    • Author(s)
      K. Abe, et al.
    • Journal Title

      Physical Review Letter

      Volume: in press

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Evaluation of the radon adsorption efficiency of activated carbon fiber using tetrafluoromethane2022

    • Author(s)
      Kotsar Y、Nakano Y、Takeuchi Y、Miuchi K
    • Journal Title

      Progress of Theoretical and Experimental Physics

      Volume: 2022 Issue: 2

    • DOI

      10.1093/ptep/ptac005

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Search for neutrinos associated with solar flare2021

    • Author(s)
      Okamoto Kohei、Nakano Yuuki、Ito Shintaro
    • Journal Title

      Proceedings of Science

      Volume: 395 Pages: 1299-1299

    • DOI

      10.22323/1.395.1299

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Measurements of the charge ratio and polarization of cosmic ray muons with the Super-Kamiokande detector2021

    • Author(s)
      Kitagawa Hussain、Nakano Yuuki、Koshio Yusuke、Super-Kamiokande Collaboration
    • Journal Title

      Proceedings of Science

      Volume: 395 Pages: 360-360

    • DOI

      10.22323/1.395.0360

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Development of high-sensitivity radon detector in water for neutrino physics2021

    • Author(s)
      Takeda Atsushi、Nakano Yuuki、Okamoto Kohei、Takeuchi Yasuo
    • Journal Title

      Journal of Physics: Conference Series

      Volume: 2156 Issue: 1 Pages: 012243-012243

    • DOI

      10.1088/1742-6596/2156/1/012243

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Scintillation light increase of carbontetrafluoride gas at low temperature2021

    • Author(s)
      Mizukoshi K.、Maeda T.、Nakano Y.、Higashino S.、Miuchi K.
    • Journal Title

      Journal of Instrumentation

      Volume: 16 Issue: 12 Pages: P12033-P12033

    • DOI

      10.1088/1748-0221/16/12/p12033

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Measurement of the charge ratio and polarization of cosmic-ray muon using the tagged decay-e events in Super-Kamiokande2023

    • Author(s)
      Y. Nakano, T. Tada, H. Kitagawa, Y. Koshio
    • Organizer
      ICRC 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Super-Kamiokande検出器を用いた宇宙線ミューオンの電荷比と偏極測定の結果2023

    • Author(s)
      中野佑樹、多田智昭、小汐由介、佐藤和史
    • Organizer
      日本物理学会 2023年春季大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 高感度ラドン検出器の最近の進展2023

    • Author(s)
      中野佑樹
    • Organizer
      第9回 「極低放射能技術」研究会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Super-Kamiokande検出器を用いた宇宙線ミューオンの電荷比と偏極測定の天頂角依存性と方位角依存性の結果2023

    • Author(s)
      中野佑樹、多田智昭、佐藤和史、島村蓮、小汐由介
    • Organizer
      日本物理学会2024年春季大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Measurement of the kaon to pion production ratio with the Super-Kamiokande2023

    • Author(s)
      Y. Nakano, T. Tada, Y. Koshio
    • Organizer
      ICRC 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Current status of the Super-Kamiokande and SK-Gd2022

    • Author(s)
      Yuuki Nakano
    • Organizer
      The 21st international workshop on Next Generation Nucleon Decay and Neutrino Detectors (NNN22)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Recent progresses of the radon detector with an electrostatic collection2022

    • Author(s)
      Yuuki Nakano
    • Organizer
      Low Radioactivity Techniques workshop (LRT2022)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Search for neutrinos associated with solar flares in the Super-Kamiokande detector2022

    • Author(s)
      Yuuki Nakano
    • Organizer
      International Conference on the Physics of the Two Infinities
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Measurements of the charge ratio of cosmic-ray muons with the Super-Kamiokande detector2022

    • Author(s)
      Yuuki Nakano
    • Organizer
      Unreaveling the history of the universe and matter evolution with underground physics
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Study of neutrinos from the Sun in the Super-Kamiokande detector2022

    • Author(s)
      Yuuki Nakano
    • Organizer
      The XXX International Conference on Neutrino Physics and Astrophysics (Neutrino 2022)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Super-Kamiokande検出器を用いた太陽からのニュートリノ観測2022

    • Author(s)
      中野佑樹
    • Organizer
      日本天文学会 2022年秋季年会
    • Related Report
      2022 Research-status Report
  • [Presentation] ラドン検出器における湿度依存性の系統的な評価 (3)2022

    • Author(s)
      中野佑樹, 関谷洋之, 竹内康雄, Guillaume Pronost
    • Organizer
      日本物理学会 2023年春季大会
    • Related Report
      2022 Research-status Report
  • [Presentation] ラドン検出器における湿度依存性の系統的な評価 (2)2022

    • Author(s)
      中野佑樹, 関谷洋之, 竹内康雄, Guillaume Pronost
    • Organizer
      日本物理学会 2022年秋季大会
    • Related Report
      2022 Research-status Report
  • [Presentation] Search for neutrinos associated with solar flares in the Super-Kamiokande detector2022

    • Author(s)
      Yuuki Nakano for the Super-Kamiokande collaboration
    • Organizer
      Particle Acceleration in Solar Flares and the Plasma Universe -- Deciphering its features under magnetic reconnection
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Recent status of SK/SK-Gd2022

    • Author(s)
      Yuuki Nakano for the Super-Kamiokande collaboration
    • Organizer
      新学術領域「ニュートリノで拓く素粒子と宇宙」Exploration of Particle Physics and Cosmology with Neutrino
    • Related Report
      2021 Research-status Report
  • [Presentation] Super-Kamiokandeを用いた太陽フレア由来のニュートリノ探索2022

    • Author(s)
      中野 佑樹 for the Super-Kamiokande collaboration
    • Organizer
      2021年度 ISEE 研究集会
    • Related Report
      2021 Research-status Report
  • [Presentation] ラドン検出器における湿度依存性の系統的な評価2022

    • Author(s)
      中野 佑樹, 兼村 侑希, G. Pronost, 関谷 洋之, 竹内 康雄
    • Organizer
      日本物理学会 第77回年次大会
    • Related Report
      2021 Research-status Report
  • [Presentation] Search for neutrinos associated with solar flares in the Super-Kamiokande detector2021

    • Author(s)
      Yuuki Nakano for the Super-Kamiokande collaboration
    • Organizer
      新学術「地下宇宙」2021年領域研究会
    • Related Report
      2021 Research-status Report
  • [Remarks] Yuuki Nakano's Homepage

    • URL

      http://www3.u-toyama.ac.jp/astropp/ynakanoindex.html

    • Related Report
      2023 Annual Research Report
  • [Remarks] Yuuki Nakano's Homepage

    • URL

      https://www-sk.icrr.u-tokyo.ac.jp/~ynakano_s/

    • Related Report
      2022 Research-status Report
  • [Remarks] Yuuki NakanoのHP

    • URL

      https://www-sk.icrr.u-tokyo.ac.jp/~ynakano_s/index.html

    • Related Report
      2021 Research-status Report

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

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