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Progress in neutrino oscillation physics

Research Project

Project/Area Number 15204016
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field Particle/Nuclear/Cosmic ray/Astro physics
Research InstitutionThe University of Tokyo

Principal Investigator

KAJITA Takaaki  The university of Tokyo, Institute for Cosmic Ray Research, Professor, 宇宙線研究所, 教授 (40185773)

Co-Investigator(Kenkyū-buntansha) KANEYUKI Kenji  The University of Tokyo, Institute for Cosmic Ray Research, Associate Professor, 宇宙線研究所, 助教授 (30224629)
OKUMURA Kimihiro  The university of Tokyo, Institute for Cosmic Ray Research, Research Associate, 宇宙線研究所, 助手 (70361657)
ITOW Yoshitaka  Nagoya University, Solar-Terrestrial Environment Laboratory, Professor, 太陽地球環境研究所, 教授 (50272521)
KOBAYASHI Takashi  High Energy Accelerator Research Organization, Institute of Particle and Nuclear Studies, Associate Professor, 素粒子原子核研究所, 助教授 (70291317)
SHIOZAWA Masato  The University of Tokyo, Institute for Cosmic Ray Research, Associate Professor, 宇宙線研究所, 助教授 (70272523)
大林 由尚  東京大学, 宇宙線研究所, 助手 (50345055)
Project Period (FY) 2003 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥34,450,000 (Direct Cost: ¥26,500,000、Indirect Cost: ¥7,950,000)
Fiscal Year 2005: ¥9,230,000 (Direct Cost: ¥7,100,000、Indirect Cost: ¥2,130,000)
Fiscal Year 2004: ¥9,880,000 (Direct Cost: ¥7,600,000、Indirect Cost: ¥2,280,000)
Fiscal Year 2003: ¥15,340,000 (Direct Cost: ¥11,800,000、Indirect Cost: ¥3,540,000)
KeywordsNeutrino / Neutrino Oscillation
Research Abstract

A detailed study on the front detector system at the T2K experiment was carried out. T2K is a next generation neutrino oscillation experiment. Neutrinos are generated by the J-PARC accelerator and are detected in Super-Kamiokande. The experiment will start in 2009. One of the main goals of this experiment is the search for non-zero θ_<13>, which is one of the neutrino mixing angles and is not known yet. The front detector should be able to predict the neutrino energy spectrum and neutrino flavor without oscillation. Detailed Monte Carlo study concluded that a water Cherenkov detector with about 5000 20cm-diameter photomultipliers, located about 1.8km from the neutrino production target should have a sufficiently high performance for this experiment.
In addition, future possibilities with the T2K neutrino beam were studied. It was concluded that large water Cherenkov detectors located in Kamioka and in Korea should have a very high sensitivity to the measurement of the neutrino CP phase and mass hierarchy.
Studies of neutrino oscillations based on atmospheric neutrino events observed in Super-Kamiokande and K2K neutrino beam events were carried out. Various new results on neutrino masses and mixing angles were obtained. All the existing results are explained within the standard neutrino oscillation frame work.

Report

(4 results)
  • 2005 Annual Research Report   Final Research Report Summary
  • 2004 Annual Research Report
  • 2003 Annual Research Report
  • Research Products

    (27 results)

All 2006 2005 2004 Other

All Journal Article (22 results) Book (1 results) Publications (4 results)

  • [Journal Article] An Improved search for ν_μ → ν_e oscillation in a long-baseline accelerator experiment2006

    • Author(s)
      S.Yamamoto, T.Kajita, et al.
    • Journal Title

      Phys. Rev. Lett. 96

      Pages: 181801-181801

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] An Improved search for ν_μ →ν_e oscillation in a long-baseline accelerator experiment2006

    • Author(s)
      S.Yamamoto, T.Kajita et al.
    • Journal Title

      Phys.Rev.Lett. 96

      Pages: 181801-181801

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] A measurement of atmospheric neutrino oscillation parameters by Super-Kamiokande-I2005

    • Author(s)
      Y.Ashie, T.Kajita, et al.
    • Journal Title

      Phys. Rev. D 71

      Pages: 112005-112005

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Resolving neutrino mass hierarchy and CP degeneracy by two Identical detectors with different baselines2005

    • Author(s)
      M.Ishitsuka, T.Kajita, H.Minakaa, H.Nunokawa
    • Journal Title

      Phys. Rev. D 72

      Pages: 33003-33003

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Evidence for muon neutrino oscillation in an accelerator-based experiment2005

    • Author(s)
      E.Aliu, T.Kajita, et al.
    • Journal Title

      Phys. Rev. Lett. 94

      Pages: 81802-81802

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] A measurement of atmospheric neutrino oscillation par ameters by Super-Kamiokande-I2005

    • Author(s)
      Y.Ashie, T.kajita et al.
    • Journal Title

      Phys.Rev.D 71

      Pages: 112005-112005

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Resolving neutrino mass hierarchy and CP degeneracy by two Identical detectors with different baselines2005

    • Author(s)
      M.Ishitsuka, T.Kajita, H.Minakaa, H.Nunokawa
    • Journal Title

      Phys.Rev.D. 72

      Pages: 33003-33003

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Evidence for muon neutrino oscillation in an accelerator-based experiment2005

    • Author(s)
      E.Aliu, T.Kajita et al.
    • Journal Title

      Phys.Rev.Lett. 94

      Pages: 81802-81802

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] A measurement of atmospheric neutrino oscillation parameters by Super-Kamiokande-I2005

    • Author(s)
      Y.Ashie, T.Kajita et al.
    • Journal Title

      Phys.Rev.D 71

      Pages: 112005-112005

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Resolving neutrino mass hierarchy and CP degeneracy by two identical detectors with different baselines2005

    • Author(s)
      M.Ishitsuka, T.Kajita et al.
    • Journal Title

      Phys.Rev.D 72

      Pages: 33003-33003

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Super-Kamiokande atmospheric neutrino results and long baseline experiments in Japan2005

    • Author(s)
      T.Kajita
    • Journal Title

      Nucl, Phys.Proc.Suppl. 145

      Pages: 75-75

    • Related Report
      2005 Annual Research Report
  • [Journal Article] K2K far detector analysis2005

    • Author(s)
      K.Kaneyuki
    • Journal Title

      Nucl, Phys.Proc.Suppl. 149

      Pages: 119-119

    • Related Report
      2005 Annual Research Report
  • [Journal Article] T2K experiment2005

    • Author(s)
      K.Kaneyuki
    • Journal Title

      Nucl, Phys.Proc.Suppl. 145

      Pages: 124-124

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Science with high intensity hadron machines2005

    • Author(s)
      T.Kobayashi
    • Journal Title

      Nucl, Phys.Proc.Suppl. 149

      Pages: 104-104

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Evidence for muon neutrino oscillation in an accelerator-based experiment2005

    • Author(s)
      E.Aliu et al.
    • Journal Title

      Phys.Rev.Lett. 94

      Pages: 81802-81802

    • Related Report
      2004 Annual Research Report
  • [Journal Article] A measurement of atmospheric neutrino oscillation parameters by Super-Kamiokande I2005

    • Author(s)
      Y.Ashie et al.
    • Journal Title

      Phys.Rev.D (発刊予定)

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Evidence for an oscillatory signature in atmospheric neutrino oscillation2004

    • Author(s)
      Y.Ashie, T.Kajita, et al.
    • Journal Title

      Phys. Rev. Lett. 93

      Pages: 101801-101801

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Atmospheric neutrinos2004

    • Author(s)
      T.Kajita
    • Journal Title

      New J. Phys. 6

      Pages: 194-194

    • NAID

      110001208580

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Evidence for an oscillatory signature in atmospheric neutrino oscillation2004

    • Author(s)
      Y.Ashie, T.Kjita et al.
    • Journal Title

      Phys.Rev.Lett. 93

      Pages: 101801-101801

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Atmospheric Neutrinos2004

    • Author(s)
      T.Kajita
    • Journal Title

      New J.Phys. 6

      Pages: 194-194

    • NAID

      110001208580

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary 2004 Annual Research Report
  • [Journal Article] Evidence for oscillatory signature in atmospheric neutrino oscillation2004

    • Author(s)
      Y.Ashie et al.
    • Journal Title

      Phys.Rev.Lett. 93

      Pages: 101801-101801

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Search for electron neutrino appearance in a 250km long baseline experiment2004

    • Author(s)
      M.H.Ahn et al.
    • Journal Title

      Phys.Rev.Lett. 93

      Pages: 51801-51801

    • Related Report
      2004 Annual Research Report
  • [Book] Sub-Dominant Oscillation Effects in Atmospheric Neutrino Experiments2005

    • Author(s)
      T.Kajita, K.Okumura(Eds.)
    • Total Pages
      251
    • Publisher
      Universal Academy Press, Inc.
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Publications] M.H.Ahn et al.: "Search for electron neutrino appearance in a 250km long baseline experiment"Phys.Rev.Lett.. (発行予定). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Kobayashi: "Conventional neutrino beams at K2K and JHF"Nucl.Instrum.Meth.A. 503. 418-420 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Kajita: "Present status and future prospects of the atmospheric neutrino experiments"J.Phys.G. 29. 1471-1479 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Kajita: "Status of Super-Kamiokande and the JHF-Kamioka neutrino project"Proc.of the Third international Conference on Particle Physics beyond the Standard Model. 107・2. B5-B14 (2003)

    • Related Report
      2003 Annual Research Report

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Published: 2003-04-01   Modified: 2016-04-21  

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