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Research on the galactic cosmic-ray acceleration and propagation by the direct measurement of the cosmic-ray nuclei

Research Project

Project/Area Number 21K03592
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 InstitutionWaseda University

Principal Investigator

Akaike Yosui  早稲田大学, 理工学術院, 主任研究員(研究院准教授) (70726744)

Project Period (FY) 2021-04-01 – 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 2023: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2022: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2021: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywords銀河宇宙線 / 衝撃波加速 / 銀河内伝播 / 国際宇宙ステーション / カロリメータ / CALET / 宇宙線原子核 / 二次核一次核比 / 高エネルギー宇宙線
Outline of Research at the Start

我々が住む銀河系内を起源とする宇宙線(銀河宇宙線)は、超新星残骸における衝撃波で加速され、星間磁場により銀河系内を拡散的に伝播して地球に飛来するという標準モデルにより理解されている。しかしその起源や加速・伝播機構の詳細について未解明な点は多く、それどころか標準モデルでは予想されていないスペクトルの変化(硬化)を示す観測結果が報告されている。本研究では、国際宇宙ステーションに搭載した宇宙線観測機CALET(CALorimetric Electron Telescope)のデータを基に、Z=1-26の各原子核のエネルギースペクトルを測定し、宇宙線の加速・伝播機構の描像を明らかにすることを目指す。

Outline of Final Research Achievements

In this study, we analyzed data from the Calorimetric Electron Telescope (CALET), a cosmic-ray experiment installed on the International Space Station. We derived energy spectra of cosmic-ray nuclei such as protons, He, B, C, O, Fe and Ni with unprecedented accuracy. The obtained data are crucial for understanding the acceleration and propagation of cosmic rays, including the hardening of spectra and measurements of secondary-to-primary ratios that cannot be explained by standard acceleration and propagation models. Furthermore, we also achieved results regarding the energy spectrum of electrons + positrons and the charge dependence of cosmic-ray fluxes due to solar modulation.

Academic Significance and Societal Importance of the Research Achievements

宇宙における高エネルギー放射の理解には、その源になっている荷電粒子(宇宙線)の理解が必須である。地球で観測される宇宙線は、その加速・伝播が複雑に絡み合った結果であり、宇宙線を正確に理解するためには、粒子種別や個々のエネルギースペクトルを測定し、各々の側面を切り分けることが不可欠である。本研究では、CALETによる高い粒子選別性能と長期間の観測量を背景に、直接観測として最も高いエネルギー領域(GeV - TeV領域)のエネルギースペクトルを導出した。これらは、宇宙線の加速・伝播モデルの検証に重要な基礎データとなり、宇宙における高エネルギー現象の探究に重要な役割を果たす。

Report

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

    (40 results)

All 2024 2023 2022 2021 Other

All Int'l Joint Research (6 results) Journal Article (11 results) (of which Int'l Joint Research: 11 results,  Peer Reviewed: 11 results,  Open Access: 11 results) Presentation (18 results) (of which Int'l Joint Research: 9 results,  Invited: 3 results) Remarks (5 results)

  • [Int'l Joint Research] NASA Goddard Space Flight Center/Louisiana State University/Washington University in St. Louis(米国)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] University of Siena/University of Pisa/University of Florence(イタリア)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] NASA Goddard Space Flight Center/Louisiana State University/Washington University in St. Louis(米国)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] University of Siena/University of Pisa/University of Padova(イタリア)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] NASA Goddard Space Flight Center/Louisiana State University/Washington University in St. Louis(米国)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] University of Siena/University of Pisa/University of Padova(イタリア)

    • Related Report
      2021 Research-status Report
  • [Journal Article] Direct measurements of cosmic-ray iron and nickel with CALET on the International Space Station2024

    • Author(s)
      O. Adriani, Y. Akaike et al., (CALET Collaboration)
    • Journal Title

      Advances in Space Research

      Volume: - Issue: 9 Pages: 4368-4376

    • DOI

      10.1016/j.asr.2024.03.052

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The Calorimetric Electron Telescope (CALET) on the International Space Station: Results from the first eight years on orbit2024

    • Author(s)
      Y. Akaike et al. (CALET Collaboration)
    • Journal Title

      Advances in Space Research

      Volume: - Issue: 9 Pages: 4353-4367

    • DOI

      10.1016/j.asr.2024.04.035

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Charge-Sign Dependent Cosmic-Ray Modulation Observed with the Calorimetric Electron Telescope on the International Space Station2023

    • Author(s)
      Adriani O., Akaike Y., ..., Miyake S., ..., Munakata K. et al. (CALET Collaboration)
    • Journal Title

      Physical Review Letters

      Volume: 130 Issue: 21 Pages: 211001-211001

    • DOI

      10.1103/physrevlett.130.211001

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Direct Measurement of the Spectral Structure of Cosmic-Ray Electrons + Positrons in the TeV Region with CALET on the International Space Station2023

    • Author(s)
      O. Adriani, Y. Akaike et al., (CALET Collaboration)
    • Journal Title

      Physical Review Letters

      Volume: 131 Issue: 19 Pages: 191001-191001

    • DOI

      10.1103/physrevlett.131.191001

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Direct measurements of cosmic rays with the calorimetric electron telescope on the international space station2023

    • Author(s)
      Y. Akaike et al. (CALET Collaboration)
    • Journal Title

      SciPost Physics Proceedings

      Volume: - Issue: 13 Pages: 040-040

    • DOI

      10.21468/scipostphysproc.13.040

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Direct Measurement of the Cosmic-Ray Helium Spectrum from 40 GeV to 250 TeV with the Calorimetric Electron Telescope on the International Space Station2023

    • Author(s)
      O. Adriani, Y. Akaike et al. (CALET Collaboration)
    • Journal Title

      Physical Review Letters

      Volume: 130 Issue: 17 Pages: 171002-171002

    • DOI

      10.1103/physrevlett.130.171002

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Cosmic-Ray Boron Flux Measured from 8.4 GeV/n to 3.8 TeV/n with the Calorimetric Electron Telescope on the International Space Station2022

    • Author(s)
      O. Adriani, Y. Akaike et al. (CALET Collaboration)
    • Journal Title

      Physical Review Letters

      Volume: 129 Issue: 25 Pages: 251103-251103

    • DOI

      10.1103/physrevlett.129.251103

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Observation of Spectral Structures in the Flux of Cosmic-Ray Protons from 50 GeV to 60 TeV with the Calorimetric Electron Telescope on the International Space Station2022

    • Author(s)
      O. Adriani, Y. Akaike et al. (CALET Collaboration)
    • Journal Title

      Physical Review Letters

      Volume: 129 Issue: 10 Pages: 101102-101102

    • DOI

      10.1103/physrevlett.129.101102

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] CALET Search for Electromagnetic Counterparts of Gravitational Waves during the LIGO/Virgo O3 Run2022

    • Author(s)
      O. Adriani, Y. Akaike et al. (CALET Collaboration)
    • Journal Title

      The Astrophysical Journal

      Volume: 933 Issue: 1 Pages: 85-85

    • DOI

      10.3847/1538-4357/ac6f53

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Direct Measurement of the Nickel Spectrum in Cosmic Rays in the Energy Range from 8.8 GeV/n to 240 GeV/n with CALET on the International Space Station2022

    • Author(s)
      O. Adriani, Y. Akaike et al., (CALET Collaboration)
    • Journal Title

      Physical Review Letters

      Volume: 128 Issue: 13 Pages: 131103-131103

    • DOI

      10.1103/physrevlett.128.131103

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Measurement of the Iron Spectrum in Cosmic Rays from 10 GeV/n to 2.0 TeV/n with the Calorimetric Electron Telescope on the International Space Station2021

    • Author(s)
      O. Adriani, Y. Akaike et al., (CALET Collaboration)
    • Journal Title

      Physical Review Letters

      Volume: 126 Issue: 24 Pages: 241101-241101

    • DOI

      10.1103/physrevlett.126.241101

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] CALETによる10GeVから7.5TeVの電子のエネルギースペクトル測定結果2024

    • Author(s)
      赤池陽水, 他CALETチーム
    • Organizer
      日本物理学会2024年春季大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] ISS搭載CALETによる8年間の軌道上観測の成果2024

    • Author(s)
      赤池陽水
    • Organizer
      太陽地球環境と宇宙線モジュレーション
    • Related Report
      2023 Annual Research Report
  • [Presentation] CALETにおけるTeV領域電子の選別手法の改良2023

    • Author(s)
      赤池陽水, 他CALETチーム
    • Organizer
      日本物理学会 第78回年次大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] The cosmic-ray electron and positron spectrum measured with CALET on the International Space Station2023

    • Author(s)
      Yosui Akaike, Shoji Torii for the CALET Collaboration
    • Organizer
      38th International Cosmic Ray Conference
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] CALETによる宇宙線原子核成分観測の最新成果2023

    • Author(s)
      赤池陽水、他CALETチーム
    • Organizer
      第23回宇宙科学シンポジウム
    • Related Report
      2022 Research-status Report
  • [Presentation] CALETによる8.4GeV/nから3.8TeV/nのホウ素/炭素比の観測結果2023

    • Author(s)
      赤池陽水、他CALETチーム
    • Organizer
      日本物理学会2023年春季大会
    • Related Report
      2022 Research-status Report
  • [Presentation] The Calorimetric Electron Telescope (CALET) on the International Space Station; Results from the First Six Years on Orbit2022

    • Author(s)
      Y. Akaike on behalf of the CALET Collaboration
    • Organizer
      44th COSPAR Scientific Assembly
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Direct Measurements of Cosmic Rays with the Calorimetric Electron Telescope on the International Space Station2022

    • Author(s)
      Y. Akaike on behalf of the CALET Collaboration
    • Organizer
      21st International Symposium on Very High Energy Cosmic Ray Interactions
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] CALETによる鉄とニッケルのエネルギースペクトルとB/C比の観測2022

    • Author(s)
      赤池陽水、他CALETチーム
    • Organizer
      日本物理学会2022年秋季大会
    • Related Report
      2022 Research-status Report
  • [Presentation] 国際宇宙ステーション搭載CALETによる宇宙線原子核の観測2022

    • Author(s)
      赤池陽水、他CALETチーム
    • Organizer
      第22回宇宙科学シンポジウム
    • Related Report
      2021 Research-status Report
  • [Presentation] 国際宇宙ステーションにおけるCALET6年間の観測・運用とエネルギー較正2022

    • Author(s)
      赤池陽水、鳥居祥二、小林兼好、田村忠久、森正樹、浅岡陽一
    • Organizer
      日本物理学会第77会年次大会
    • Related Report
      2021 Research-status Report
  • [Presentation] Precise Measurement of the Cosmic-Ray Electron and Positron Spectrum with CALET on the International Space Station2021

    • Author(s)
      S. Torii, Y. Akaike on behalf of the CALET Collaboration
    • Organizer
      37th International Cosmic Ray Conference
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Measurement of the cosmic-ray secondary-to-primary ratios with CALET on the International Space Station2021

    • Author(s)
      Y. Akaike, P. Maestro on behalf of the CALET Collaboration
    • Organizer
      37th International Cosmic Ray Conference
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Investigation the Vela SNR's Emission of Electron Cosmic Rays with CALET at the International Space Station2021

    • Author(s)
      H. Motz, O. Adriani, Y. Akaike et al.
    • Organizer
      37th International Cosmic Ray Conference
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] The analysis strategy for the measurement of the electron flux with CALET on the International Space Station2021

    • Author(s)
      E. Berti, L. Pacini, S. Gonzi, Y. Akaike on behalf of the CALET Collaboration
    • Organizer
      37th International Cosmic Ray Conference
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Measurement of the iron spectrum with CALET on the International Space Station2021

    • Author(s)
      F. Stlzi, C. Checchia, Y. Akaike on behalf of the CALET Collaboration
    • Organizer
      37th International Cosmic Ray Conference
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Direct cosmic-ray measurements with CALET on the International Space Station2021

    • Author(s)
      Y. Akaike for the CALET Collaboration
    • Organizer
      International Conference on High Energy Density Science 2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] CALET5年間の観測による炭素・酸素・鉄のエネルギースペクトルとB/C比の観測結果2021

    • Author(s)
      赤池陽水、他CALETチーム
    • Organizer
      日本物理学会2021年秋季大会
    • Related Report
      2021 Research-status Report
  • [Remarks] 宇宙線太陽変調の顕著な違いを観測

    • URL

      https://www.waseda.jp/top/news/90562

    • Related Report
      2023 Annual Research Report
  • [Remarks] 7.5 TeVまでの宇宙線電子のエネルギースペクトル測定に成功:地球近傍の宇宙線加速源の可能性を示唆

    • URL

      https://www.waseda.jp/inst/research/news/75880

    • Related Report
      2023 Annual Research Report
  • [Remarks] 銀河系を伝播する宇宙線を高精度観測

    • URL

      https://www.waseda.jp/top/news/86418

    • Related Report
      2022 Research-status Report
  • [Remarks] DARTS: CALET

    • URL

      https://www.darts.isas.jaxa.jp/astro/calet/

    • Related Report
      2021 Research-status Report
  • [Remarks] 宇宙線の鉄/ニッケル成分の高精度観測

    • URL

      https://www.waseda.jp/top/news/79755

    • Related Report
      2021 Research-status Report

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

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