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The measurement of a tau-neutorino mass

Research Project

Project/Area Number 05044047
Research Category

Grant-in-Aid for international Scientific Research

Allocation TypeSingle-year Grants
SectionJoint Research
Research InstitutionNagoya University

Principal Investigator

NIWA Kimio  School of Science, Nagoya Univ.Professor, 理学部, 教授 (60113445)

Co-Investigator(Kenkyū-buntansha) SONG J.s.  Gyeongsang National Univ.Professor, 教授
SMIRNITSKY V.  ITEP Professor, 教授
TOLUNN P.  Ankara Univ.Professor, 教授
BARONI G.  Rome Univ.Professor, 教授
WINTER K.  CERN Professor, 教授
SHIBUYA Hiroshi  Faculty of Science, Toho Univ.Assoc.Prof., 理学部, 助教授 (40170922)
HARA Toshio  Faculty of Science, Kobe Univ.Assoc.Prof., 理学部, 助教授 (50156486)
AOKI Shigeki  Faculty of Human Development, Kobe Univ.Assoc.Prof., 発達科学部, 助教授 (80211689)
OKUSAWA Toru  Faculty of Science, Osaka City Univ.Assoc.Prof., 理学部, 助教授 (60047397)
NAKAMURA Mitsuhiro  School of Science, Nagoya Univ.Res.Assoc., 理学部, 助手 (90183889)
HOSHINO Kaoru  School of Science, Nagoya Univ.Assoc.Prof., 理学部, 助教授 (70022738)
丹生 潔  名古屋大学, 名誉教授 (50013363)
Project Period (FY) 1993 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥10,500,000 (Direct Cost: ¥10,500,000)
Fiscal Year 1995: ¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 1994: ¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 1993: ¥3,500,000 (Direct Cost: ¥3,500,000)
KeywordsNeutrino oscillation / Neutrino mass / Tau-neutrino / Dark matter / Emulsion / Scintillating fiber
Research Abstract

CHORUS is the international project using the neutrino beam from super proton synchrotrn (SPS) of CERN (Center of Europ organization for Research of Nuclus). The object of this project is to observe the mass of tau-neutrino by the method of the oscillation from mu-neutrino to tau-neutrino. The identification of tau-neutrino could be done by detecting the produced tau by observing the trace of tau from produced point to the decay point in the photographic nucler emulsion.
The detecter have many parts, target spectrometer calorimeter and muon spectrometer. We are contributing on the target the most important target of this experiment. This target has the sandwich structure of emulsion sheets and fiber trackers.
The neutrino exposure has been finished on Novenber in 1995. The emulsion analysis, the most difficult job in this project, has been done by using Automatic emulsion analysis system originally developed by physists of Nagoya university. The number of analyzed neutrino interaction in the emulsion is more than 7700 neutorino interactions by 4 month scanning. This number is about 15% of all CHORUS, but already this number is 2 times higher than the most sensitive similler experiment, named E531 done in 1978. This experiment is sensitive to 1 eV in tauneutrino mass and 1% in mixing tau-neutrino to mu-neutrino.
To finish all of the analysis, it take more two years.

Report

(3 results)
  • 1995 Final Research Report Summary
  • 1994 Annual Research Report
  • 1993 Annual Research Report
  • Research Products

    (34 results)

All Other

All Publications (34 results)

  • [Publications] K.Teraoka: "Radiation damage test of position sensitive scilicon detectors." Nucl.Inst.Meth.A324. 276-283 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] S.Aoki: "Observation of the muonic decay Ds^+→μ^+ν" Prog.Theor.Phys.89. 131-138 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Kodama: "Observation of D→ρ (770) μν" Phys.Lett.B316. 455-462 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Kodama: "A study of the semimuonic decays of the Ds." Phys.Lett.B309. 483-491 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] S.Aoki: "Scintillating Fiber Trackers with Optolectronic Readout for the Chorus Neutrino Experiment" CERN-PPE/93-189. 4. (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Kodama: "A study of semileptonic decays of the Ds." Phys.Lett.B309. 483-491 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Kodama: "Measurement of the lifetime of Charged and neutral beauty hadrons." Prog.Theor.Phys.Vol.89. 679-696 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Kodama: "New Technique for Emulsion Analysis in a Hybrid Experinent." Nucl.Inst.Meth.B93. 340-354 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Kodama: "Upper limits for charm hadron decays to two muons plus hadrons." Phys.Lett.B345. 85-92 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Niwa: "シンチレーションファイバートラッカーの開発研究" 放射線. 21. 85-119 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Niwa: "Status report on CHORUS experiment at CERN." Nuclear Instrument and Methods.A360. 254-257 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Niwa: "Physics and Astrophysics of Neutrinos." Springer-Verlag社, 934 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Teraoka: "Radiation damage test of position sensitive scilicon detectors." Nucl.Inst.Meth.A324. 276-283 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] S.Aoki: "Observation of the muonic decay D_S^+*mu^+upsiron" Prog.Theor.Phys.89. 131-138 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Kodama: "Observation of D*p (770) muupsiron" Phys.Lett.B316. 455-462 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Kodama: "A study of the semimuonic decays of the D_S." Phys.Lett.B309. 483-491 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] S.Aoki: "Scintillating fiber trackers with optoelectronic readout for the chorus neutrino experiment" CERN-PPE/93-189. 4. (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Kodama: "A study of semileptonic decays of the D_S." Phys.Lett.B309. 483-491 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Kodama: "Measurement of the lifetime of charged and neutral beauth hadrons." Prog.Theor.Phys.89. 679-696 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Kodama: "New techniquefor emulsion analysis in a hybrid experiment." Nucl.Inst.Meth.B93. 340-354 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Kodama: "Upper limits for charm hadron decays to two muons plus hadrons." Phys.Lett.B345. 85-92 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Niwa: "Research and development of scintillating fiber tracker." Houshasenn. 21. 85-119 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Niwa: "Status report on CHORUS experiment at CERN." Nuclear Instrument and Methods. A360. 254-257 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Niwa: "Physics and Astrophysics of Neutrinos" Springer-Verlag. 934 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] S.Aoki: "Scintillating Fiber Trackers with Optoelectronic Readout for the Chorus Neutrino Experiment" CERN-PPE/93-189. 4. (1993)

    • Related Report
      1994 Annual Research Report
  • [Publications] K.Kodama: "A study of semileptonic decays of the Ds." Phys.Lett.B309. 483-491 (1993)

    • Related Report
      1994 Annual Research Report
  • [Publications] K.Kodama: "New Technique for Emulsion Analysis in a Hybrid Experiment." Nucl.Inst.Meth.B93. 340-354 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] K.Kodama: "Upper limits for charm hadron decays to two muons plus hadrons." Phys.Lett.B345. 85-92 (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] K.Kodama: "Measurement of the lifetime of charged and neutral beauty hadrons." Prog.Theor.Phys.Vol.89. 679-696 (1993)

    • Related Report
      1994 Annual Research Report
  • [Publications] K.Niwa: "Physics and Astrophysics of Neutrinos." Springer-Verlag社, 934 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] K.Teraoka: "Radiation damage test of position sensitive scilicon detectors." Nucl.Inst.Meth.A324. 276-283 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] S.Aoki: "Observation of the muonic decay Ds^+→μ^+υ" Prog.Theor.Phys.89. 131-138 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] K.Kodama: "Observation of D→ρ(770)μυ" Phys.Lett.B316. 455-462 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] K.Kodama: "A study of the semimuonic decays of the Ds." Phys.Lett.B309. 483-491 (1993)

    • Related Report
      1993 Annual Research Report

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Published: 1993-04-01   Modified: 2016-09-16  

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