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Exploring energy spectrum anisotropies in ultra-high energy cosmic rays with the Telescope Array

Research Project

Project/Area Number 18H03705
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Review Section Medium-sized Section 15:Particle-, nuclear-, astro-physics, and related fields
Research InstitutionOsaka City University

Principal Investigator

常定 芳基  大阪市立大学, 大学院理学研究科, 准教授 (50401526)

Co-Investigator(Kenkyū-buntansha) 竹田 成宏  東京大学, 宇宙線研究所, 助教 (40360581)
有働 慈治  神奈川大学, 工学部, 准教授 (50506714)
冨田 孝幸  信州大学, 学術研究院工学系, 助教 (70632975)
多米田 裕一郎  大阪電気通信大学, 工学部, 講師 (90467019)
Project Period (FY) 2018-04-01 – 2023-03-31
Project Status Granted (Fiscal Year 2020)
Budget Amount *help
¥43,810,000 (Direct Cost: ¥33,700,000、Indirect Cost: ¥10,110,000)
Fiscal Year 2020: ¥7,670,000 (Direct Cost: ¥5,900,000、Indirect Cost: ¥1,770,000)
Fiscal Year 2019: ¥10,530,000 (Direct Cost: ¥8,100,000、Indirect Cost: ¥2,430,000)
Fiscal Year 2018: ¥10,270,000 (Direct Cost: ¥7,900,000、Indirect Cost: ¥2,370,000)
Keywords宇宙線 / エネルギースペクトル
Outline of Annual Research Achievements

ユタ州で実施している宇宙線観測プロジェクト Telescope Array (TA)、およびその拡張計画である TAx4 によってエネルギー 10^{18} eV 以上の宇宙線を定常的に観測し、エネルギースペクトル、異方性のデータ解析を行った。検出器は地表検出器 (SD) と大気蛍光望遠鏡の2種を擁し、観測人員を毎月2名派遣してデータを蓄積した。2020年4月ー2020年2月まではSD は稼働率90%以上、FD は夜間のみの観測実施であるが稼働率10%を達成している。ただし2020年3月はコロナウイルスの世界的蔓延の影響を受け、現地への渡航と観測実施を見合わせた。

本研究の主眼である宇宙線エネルギースペクトルの研究については、TA の12年分の観測データを用い、エネルギースペクトルを更新した。結果は宇宙線国際会議 ICRC2019 (米国ウィスコンシン州)、TeVPA2019 (オーストラリア・アデレード)ほか各地の国際学会、日本物理学会(9月、3月)において報告するとともに、学術論文3篇を発表した。またエネルギースペクトルの異方性の解析については、宇宙領域を赤緯 (declination) によって2分割したエネルギースペクトルの結果を更新したほか、赤経 (right ascension) についても分割するデータ解析法の開発を進めている。データ解析について議論するミーティングをネットミーティング、京都大学における研究会(8月)などで深めたほか、共同研究者のいるユタ大学へ出張して議論し(2020年2月)、解析プログラムの開発をすすめている。

Current Status of Research Progress
Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

TA および TAx4 は順調に稼働しており、観測データは着実に蓄積されている。またデータ解析についての議論と手法の改善はコンスタントに続けれらている。ただし2020年3月からコロナウイルス蔓延のために観測を中止しており、渡航と観測再開の見込みは立っていない。しかしデータ解析は活発に進められている。

Strategy for Future Research Activity

2020年3月からコロナウイルス蔓延のために中断した観測は、早くて2020年9月から再開することを目標に議論が続けられている。データ解析は TA で観測されたデータをもちい、赤緯・赤経で分割した宇宙領域からの宇宙線のえネルギースペクトルを導出するための解析プログラムを完成させる。

Report

(2 results)
  • 2019 Annual Research Report
  • 2018 Annual Research Report

Research Products

(43 results)

All 2020 2019 2018 Other

All Int'l Joint Research Journal Article Presentation Book

  • [Int'l Joint Research] ユタ大学(米国)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] Hanyang University/Sungkyunkwan University(韓国)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] INR of the Russian Academy of Sciences(ロシア連邦)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] ブリュッセル自由大学(ベルギー)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] University of Utah(米国)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] Institute of Nuclear Research/Moscow State University(ロシア連邦)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] Sungyunkhan University/Hanyang University(韓国)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] Universite Libre de Bruxelles(ベルギー)

    • Related Report
      2018 Annual Research Report
  • [Journal Article] Search for Ultra-High-Energy Neutrinos with the Telescope Array Surface Detector2020

    • Author(s)
      R.U. Abbasi et al.
    • Journal Title

      Journal of Experimental And Theoretical Physics

      Volume: -

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Search for point sources of ultra-high-energy photons with the Telescope Array surface detector2020

    • Author(s)
      R.U. Abbasi et al.
    • Journal Title

      Monthly Notices of Royal Astronomical Society

      Volume: 492 Pages: 3984-3993

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Constraints on the diffuse photon flux with energies above 10^18 eV using the surface detector of the Telescope Array experiment2019

    • Author(s)
      R.U. Abbasi et al.
    • Journal Title

      Astroparticle Physics

      Volume: 110 Pages: 8014-8014

    • DOI

      10.1016/j.astropartphys.2019.03.003

    • Related Report
      2019 Annual Research Report 2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Telescope Arrayによる最高エネルギー宇宙線観測 -兆候の発見から精密観測へ-2019

    • Author(s)
      荻尾彰一、常定芳基、佐川宏行
    • Journal Title

      Radioisotopes

      Volume: 68 Pages: 843-856

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Study of muons from ultrahigh energy cosmic ray air showers measured with the Telescope Array experiment2018

    • Author(s)
      R. U. Abbasi et al.
    • Journal Title

      Physical Review D

      Volume: 98 Pages: 022002-022002

    • DOI

      10.1103/physrevd.98.022002

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Depth of Ultra High Energy Cosmic Ray Induced Air Shower Maxima Measured by the Telescope Array Black Rock and Long Ridge FADC Fluorescence Detectors and Surface Array in Hybrid Mode2018

    • Author(s)
      R.U. Abbasi et. al.
    • Journal Title

      Astrophysical Journal

      Volume: 858 Pages: 76-76

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Testing a Reported Correlation between Arrival Directions of Ultra-high-energy Cosmic Rays and a Flux Pattern from nearby Starburst Galaxies using Telescope Array Data2018

    • Author(s)
      R.U. Abbasi et. al.
    • Journal Title

      Astrophysical Journal Letters

      Volume: 867

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Evidence of Intermediate-scale Energy Spectrum Anisotropy of Cosmic Rays E >= 10(19.2)eV with the Telescope Array Surface Detector2018

    • Author(s)
      R.U. Abbasi et. al.
    • Journal Title

      Astrophysical Journal

      Volume: 862 Pages: 91-91

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Gamma Ray Showers Observed at Ground Level in Coincidence With Downward Lightning Leaders2018

    • Author(s)
      R.U. Abbasi et. al.
    • Journal Title

      Journal of Geophysical Research: Atmospheres

      Volume: 123 Pages: 6864-6879

    • DOI

      10.1029/2017jd027931

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] The Cosmic Ray Energy Spectrum between 2PeV and 2EeV Observed with the TALE Detector in Monocular Mode2018

    • Author(s)
      R.U. Abbasi et. al.
    • Journal Title

      Astrophysical Journal

      Volume: 865 Pages: 1-1

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] The energy spectrum of ultra-high energy cosmic rays measured at the Pierre Auger Observatory and at the Telescope Array2019

    • Author(s)
      O.Deligny, D.Ikeda, E.Kido, S.Ogio, S.Nagataki, H.Sagawa, T.Nonaka, M.Takeda, Y.Tsunesada, S.Udo et al. (Telescope Array Collaboration)
    • Organizer
      International Cosmic Ray Conference (ICRC2019)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] SUPERGALACTIC STRUCTURE OF ENERGY-ANGLE CORRELATIONS2019

    • Author(s)
      J.P.Lundquist, D.Ikeda, E.Kido, S.Ogio, S.Nagataki, H.Sagawa, T.Nonaka, M.Takeda, Y.Tsunesada, S.Udo et al. (Telescope Array Collaboration)
    • Organizer
      International Cosmic Ray Conference (ICRC2019)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] TA実験327:地表粒子検出器アレイによるTAホットスポットの最新結果2019

    • Author(s)
      川田和正、池田大輔、有働慈治、荻尾彰一、木戸英治、佐川宏行、竹田成宏、常定芳基、長瀧重博、野中敏幸、他Telescope Array Collaboration
    • Organizer
      日本物理学会 2019年秋季大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] TA実験329:TAx4実験全体報告52019

    • Author(s)
      木戸英治、池田大輔、有働慈治、荻尾彰一、佐川宏行、竹田成宏、常定芳基、野中敏幸、他Telescope Array Collaboration
    • Organizer
      日本物理学会 2019年秋季大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Recent results and status of the Telescope Array Experiment2019

    • Author(s)
      E.Kido, D.Ikeda, S.Ogio, S.Nagataki, H.Sagawa, T.Nonaka, M.Takeda, Y.Tsunesada, S.Udo et al. (Telescope Array Collaboration)
    • Organizer
      The 2019 TeV Particle Astrophysics conference(TeVPA 2019)(国際学会)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] TA実験336:10^{18.5}eV以上のEAS粒子ディスク時空間構造とEAS発達(5)2019

    • Author(s)
      仲田海人、常定芳基、野中敏幸、佐川宏行、他Telescope Array Collaboration
    • Organizer
      "日本物理学会 第75回年次大会"
    • Related Report
      2019 Annual Research Report
  • [Presentation] Latest results form TA2018

    • Author(s)
      Yoshiki Tsunesada
    • Organizer
      "AMS Days at La Palma", La Palma, Spain
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Telescope Array Experiment2018

    • Author(s)
      Shoichi Ogio
    • Organizer
      ISVHECRI2018, Nagoya, Japan
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Recent results from the Telescope Array2018

    • Author(s)
      Yoshiki Tsunesada
    • Organizer
      "QCD at Cosmic Energies VII", Riga, Latvia
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Results from the Telescope Array Experiment2018

    • Author(s)
      Charles Jui
    • Organizer
      CRIS2018, Scitilia, Italy
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] TA/Lightning2018

    • Author(s)
      John Belz
    • Organizer
      ICAE, Nara, Japan
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Highlights from the Telescope Array Experiment2018

    • Author(s)
      Il Park
    • Organizer
      The 39th ICHEP, Seoul, Korea
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Observation of EHE Cosmic Rays with the Telescope Array Experiment2018

    • Author(s)
      Masahiro Takeda
    • Organizer
      ICNFP2018, Crete, Greece
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Summary of Results from the Telescope Array Experiment2018

    • Author(s)
      Maxim Prishkov
    • Organizer
      The 26th E+CRS/35th RCRC
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Latest results and current status of theTelescope Array Experiment2018

    • Author(s)
      Shoichi Ogio
    • Organizer
      VHEPU 2018, Quy Nhon, Vietnam
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Telescope Array Experiment2018

    • Author(s)
      Dmitri Ivanov
    • Organizer
      TeVPA 2018, Berlin, Germany
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Recent results of the Telescope Array Experiment on ultra-high energy cosmic rays and TA extension2018

    • Author(s)
      Hiroyuki Sagawa
    • Organizer
      PACIFIC2018, Moorea, French Polynesia
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Observation of Ultra-High-Energy Cosmic Rays with the Telescope Array Experiment2018

    • Author(s)
      Kazumasa Kawata
    • Organizer
      IWARA2018, Peru
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Status and results of the Telescope Array Observatory2018

    • Author(s)
      Grigory Rubtsov
    • Organizer
      WASDHA2018, Moscow, Russia
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] TA/Lightning2018

    • Author(s)
      Rasha Abbasi
    • Organizer
      AtmoHEAD2018, Capri, Italy
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] TA Spectrum2018

    • Author(s)
      Dmtri Ivanov
    • Organizer
      UHECR2018, Paris, France
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] The Telescope Array experiment2018

    • Author(s)
      Armando di Matteo
    • Organizer
      eXtreme2019
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Recent results from the Telescope Array experiment2018

    • Author(s)
      Masahiro Takeda
    • Organizer
      The 10th VHEPA Workshop, ICRR, Japan
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Report on the discrepancy of muon densities between data and MC from cosmic ray air shower experiments2018

    • Author(s)
      Ryuji Takeishi
    • Organizer
      Workshop for Atmospheric Neutrino Production in the MeV to PeV range, Nagoya, Japan
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Book] 宇宙の観測III 第2版 (シリーズ現代の天文学)2019

    • Author(s)
      井上、小山、高橋、水本、常定ほか
    • Total Pages
      324
    • Publisher
      日本評論社
    • ISBN
      4535607672
    • Related Report
      2019 Annual Research Report

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Published: 2018-04-23   Modified: 2021-01-27  

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