Auger計画による最高エネルギー宇宙線スペクトラム解析

• Project/Area Number: 19840049
• Research Category: Grant-in-Aid for Young Scientists (Start-up)
• Allocation Type: Single-year Grants
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Konan University
• Principal Investigator: YAMAMOTO Tokonatsu Konan University, 理工学部, 准教授 (40454722)
• Project Period (FY): 2007 – 2008
• Project Status: Completed (Fiscal Year 2008)
• Budget Amount: ¥3,115,000 (Direct Cost: ¥2,710,000、Indirect Cost: ¥405,000); Fiscal Year 2008: ¥1,755,000 (Direct Cost: ¥1,350,000、Indirect Cost: ¥405,000); Fiscal Year 2007: ¥1,360,000 (Direct Cost: ¥1,360,000)
• Keywords: 宇宙線 / 宇宙観測 / 高エネルギー / 国際共同実験 / 最高エネルギー宇宙線 / 多国籍 / エネルギースペクトラム / 国際情報交換

Research Abstract

本研究費によりPierre Auger計画に参加し、最高エネルギー宇宙線の観測を行った。特に観測データを解析しエネルギースペクトルを求めた。この解析により7年分の観測データを使い宇宙線のエネルギーを求めた。この結果宇宙線のスペクトルは10 の18.5 乗eV付近と19.5乗eV 付近に折れ曲がりがあることが確認された。この結果により、40年以上にわたり様々な宇宙線実験の間で論争になっていた宇宙線スペクトルの最大エネルギーに一応の決着がついた。このスペクトルの構造は宇宙線が銀河間空間を伝搬中に宇宙背景放射と相互作用をした結果であるとも、宇宙線が発生した領域のスペクトルを反映しているとも解釈できる。

Research Products

• [Journal Article] 最高エネルギー宇宙線 (2009)
  • Author(s): 山本常夏
  • Journal Title: パリティ 24 Pages: 49-50
• [Journal Article] Observation of the Suppression of the Flux of CR above 4x1019eV (2008)
  • Author(s): J. Abraham-T. Yamamoto and the Auger Collaboration
  • Journal Title: Physical Review Letters 101
  • Peer Reviewed
• [Journal Article] Upper Limit on the Diffuse Flux of Ultra-high Energy Tau Neutrinos from the Pierre Auger Observatory (2008)
  • Author(s): J. Abraham-T. Yamamoto and the Auger Collaboration
  • Journal Title: Physical Review Letters 100
  • Peer Reviewed
• [Journal Article] Upper Limit on the Cosmic-Ray Photon Flux Above 1019eV Using the Surface Detector of the Auger Observatory (2008)
  • Author(s): J. Abraham-T. Yamamoto and the Auger Collaboration
  • Journal Title: Astroparticle Physics 29 Pages: 243-256
  • Peer Reviewed
• [Journal Article] Correlation of the highest-energy cosmic rays with the positions of nearby active galactic nuclei (2008)
  • Author(s): J. Abraham-T. Yamamoto and the Auger Collaboration
  • Journal Title: Astroparticle Physics 29 Pages: 188-204
  • Peer Reviewed
• [Journal Article] 最高エネルギー宇宙線の謎に迫る-The Pierre Auger計画の観測成果と展望 (2008)
  • Author(s): 山本常夏
  • Journal Title: 日本物理学会誌 64 Pages: 112-116
  • NAID: 110007100403
• [Journal Article] 荷電粒子天文学の開闢 (2008)
  • Author(s): 山本常夏
  • Journal Title: 天文月報 101 Pages: 256-263
• [Journal Article] Observation of the Suppression of the Flux of Cosmic Rays above 4x1019eV (2008)
  • Author(s): Pierre Auger Collaboration
  • Journal Title: Physical Review Letters 101
  • Peer Reviewed
• [Journal Article] Upper Limit on the Diffuse Flux of Ultra-high Energy Tau Neutrinos from the Pierre Auger Observatory (2008)
  • Author(s): Pierre Auger Collaboration
  • Journal Title: Physieal Review Letters 100
  • Peer Reviewed
• [Journal Article] Upper Limit on the Cosmic-Ray Photon Flux Above 1019eVUsing the Surface Detector of the Auger Observatory (2008)
  • Author(s): Pierre Auger Collaboration
  • Journal Title: Astropartide Physics 29 Pages: 243-256
  • Peer Reviewed
• [Journal Article] Correlation of the highest-energy cosmic rays with the positions of nearby active galactic nuclei (2008)
  • Author(s): Pierre Auger Collaboration
  • Journal Title: Astroparticle Physics 29 Pages: 188-204
  • Peer Reviewed
• [Journal Article] Correlation of the highest-energy cosmic rays with positions of nearby active galactic nuclei (2008)
  • Author(s): Pierre Auger Collaboration
  • Journal Title: Astroparticle Physics 29 Pages: 188-204
  • Peer Reviewed
• [Journal Article] for the Auger Collaboration, The UHECR spectrum measured at the Auger Observatory and its astrophysical implications (2007)
  • Author(s): T. Yamamoto
  • Journal Title: Proc. Of the 30^<th> ICRC. HE1.4.A 318 Pages: 321-321
• [Journal Article] Cosmogenic Neutrinos from the propagation of Ultra High Energy Cosmic Rays (2007)
  • Author(s): D. Allard, M. Ave, N. Busca, M. A. Malkan, A. V. Olinto, E. Parizot, F. W. Stecker, T. Yamamoto
  • Journal Title: Proc of the 30^<th> ICRC, OG.2.5 852 Pages: 856-856
• [Journal Article] Correlation of the highest-energy cosmic rays with positions of nearby active galactic nuclei (2007)
  • Author(s): J. Abraham-T. Yamamoto and the Auger Collaboration
  • Journal Title: Astroparticle Physics 29 Pages: 188-204
  • Peer Reviewed
• [Journal Article] Correlation of the highest energy cosmic rays with nearby extragalactic objects (2007)
  • Author(s): J. Abraham-T. Yamamoto and the Auger Collaboration
  • Journal Title: SCIENCE 318 Pages: 939-943
  • Peer Reviewed
• [Journal Article] Anisotropy studies around the galactic centre at EeV energies with the Auger Observatory (2007)
  • Author(s): J. Abraham-T. Yamamoto and the Auger Collaboration
  • Journal Title: Astroparticle Physics 27 Pages: 244-264
  • Peer Reviewed
• [Journal Article] An upper limit ot the photon fraction in cosmic rays above 1019 eV from the Pierre Auger Observatory (2007)
  • Author(s): J. Abraham-T. Yamamoto and the Auger Collaboration
  • Journal Title: Astroparticle Physics 27 Pages: 155-176
  • Peer Reviewed
• [Journal Article] The UHECR spectrum measured at the Pierre Auger Observatory and its astrophysical implications (2007)
  • Author(s): T. Yamamoto[for the Pierre Auger collaboration]
  • Journal Title: Proc.Of the 30th International Cosmic Ray Conference 1
• [Journal Article] Cosmogenic Neutrinos from the propagation of Ultra High Energy Cosmic Rays (2007)
  • Author(s): A. Olinto, et. al.
  • Journal Title: Proc.Of the 30th International Cosmic Ray Conference 1
• [Journal Article] Correlation of the highest energy cosmic rays with nearby extragalactic objects (2007)
  • Author(s): Pierre Auger Collaboration
  • Journal Title: Science 318 Pages: 939-943
  • Peer Reviewed
• [Journal Article] Anisotropy studies around the galactic centre at EeV energies with the Auger Observatory (2007)
  • Author(s): Pierre Auger Collaboration
  • Journal Title: Astroparticle Physics 27 Pages: 244-264
  • Peer Reviewed
• [Journal Article] An upper limit to the photon fraction in cosmic rays above 10 19 eV from the Pierre Auger Observatory (2007)
  • Author(s): J. Abraham, et. al.
  • Journal Title: Astroparticle Physics 27 Pages: 155-176
  • Peer Reviewed
• [Presentation] JEM-EUSO(78)データ処理 (2009)
  • Author(s): 山本常夏
  • Organizer: 日本物理学会
  • Place of Presentation: 立教大学
  • Year and Date: 2009-03-29
• [Presentation] Pierre Auger観測所における低エネルギー拡張計画2 (2008)
  • Author(s): 山本常夏
  • Organizer: 日本物理学会
  • Place of Presentation: 山県大
  • Year and Date: 2008-09-21
• [Presentation] Auger実験の結果と展望 (2008)
  • Author(s): 山本常夏
  • Organizer: 日本物理学会
  • Place of Presentation: 山県大
  • Year and Date: 2008-09-21
• [Presentation] 特別講演 : 粒子天文学を切り開く、最高エネルギー宇宙線の観測と展望 (2008)
  • Author(s): 山本常夏
  • Organizer: 日本天文学会2008年春季年会
  • Place of Presentation: 国立オリンピック青少年センター
  • Year and Date: 2008-03-24
• [Presentation] 特別講演:粒子天文学を切り開く、最高エネルギー宇宙線の観測と展望 (2008)
  • Author(s): 山本 常夏
  • Organizer: 日本天文学会2008年春季念会
  • Place of Presentation: 国立オリンピック青少年センター
  • Year and Date: 2008-03-24
• [Presentation] Pierre Auger Projectの最新結果 (2008)
  • Author(s): 山本常夏
  • Organizer: 日本物理学会第62回年次大会
  • Place of Presentation: 北海道大学
  • Year and Date: 2008-03-23
• [Presentation] Pierre Auger観測所における低エネルギー拡張計画 (2008)
  • Author(s): 山本常夏
  • Organizer: 日本物理学会第63回年次大会
  • Place of Presentation: 近畿大学
  • Year and Date: 2008-03-23
• [Presentation] Pierre Auger Projectの最新結果 (2007)
  • Author(s): 山本 常夏
  • Organizer: 日本物理学会第62回年次大会
  • Place of Presentation: 北海道大学
  • Year and Date: 2007-09-23
• [Presentation] The UHECR spectrum measured at the Auger Observatory and its astrophysical implications (2007)
  • Author(s): T. Yamamoto
  • Organizer: 30^<th> International Cosmic Ray Conference
  • Place of Presentation: Merida, Yucatan, Mexico
  • Year and Date: 2007-07-06
• [Remarks]
  • URL: http://www.hep.konan-u.ac.jp/research/AugerJapan/
• [Remarks]
  • URL: http://www.hep.konan-u.ac.jp/research/AugerJapan/PRagnJapan/AGN_correlation_more_J.html