• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Research for neutrino oscillation by direct detection of tau-lepton

Research Project

Project/Area Number 09304031
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field 素粒子・核・宇宙線
Research InstitutionNagoya University

Principal Investigator

NIWA Kimio  Nagoya University, Graduate School of Science, Professor, 大学院・理学研究科, 教授 (60113445)

Co-Investigator(Kenkyū-buntansha) NAKAMURA Mitsuhiro  Nagoya University, Graduate School of Science, Research Associate, 大学院・理学研究科, 助手 (90183889)
HOSHINO Kaoru  Nagoya University, Graduate School of Science, Associate Professor, 大学院・理学研究科, 助教授 (70022738)
Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥35,500,000 (Direct Cost: ¥35,500,000)
Fiscal Year 1998: ¥4,500,000 (Direct Cost: ¥4,500,000)
Fiscal Year 1997: ¥31,000,000 (Direct Cost: ¥31,000,000)
KeywordsTau-neutrino / Neutorino oscillation / Emulsion / Dark matter / Elementary particle / ニュートリノ / クォークレプトン / ダークマター / ダ-クマタ- / エマルション
Research Abstract

Ultra Track selector (UTS) will make big change of the usage of the emulsion.
The CHORUS experiment is organized to study the mass of tau-neutrino using mu-neutrmno to tau-neutrino oscillation . The emulsion target was used to detect neutrino interactions and to recognize the tau-neutrmno from other neutrinos.
The first automatic emulsion scanning system (New Track Selector) was developed. Up to now, lOOK neutrino interactions were located in the emulsion and were analyzed short fight decays in emulsion targets. The tau decay search was at first focused on the decay channel of nu_<mu>*nu_<tau>, this channel has almost no background. We found zero tau-neutrino interaction and obtained the mixing limit of mu to tau sin^2 (2theta@mutau@E2) >O.OO1, (for DELTAm^2 > 10eV^2) . This result is not contradict to Super-K result which was recently presented in conference of Neutrino physics and Astrophysics (NEUTRINO'98) at Takayama city. Our result is 5 times better than the past world record E531 in FNAL 1978.
Recently we finished the development of "Ultra fast Track Selector" which has 10 times faster than "New Track Selector".

Report

(3 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • Research Products

    (19 results)

All Other

All Publications (19 results)

  • [Publications] E.Arik: "The CHORUS experiment to search for ν_μ→ν_τ oscillation" Nucl.Inst.Meth.A401. 7-44 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] E.Eskut: "A search for ν_μ→ν_τ oscillation" Phys.Lett.B424. 202-212 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] P.Annis: "Obersvation of neutrino induced diffractive D_S^<*+> production and subsequent decay D_S^<*+>→D_s^+→τ^+→μ^+" Phys.Lett.B435. 558-464 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] E.Eskut: "Search for Search for ν_μ→ν_τ using the τ decay modes into a single charged particle." Phys.Lett.B434. 205-213 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] S.Aoki: "Quaifree p(K^・,K^+)Ξ reaction in nuclear emulsion" Nuclear Physics. A644. 365-385 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] E.Eskut: "Observation of neutrino induced diffractive D_s^<+*> production in neutrino production and subsequent decay D_s^*→D_s→τ→μ" et al.,Phys.Lett.B435. 458-464 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] E.Arik, et al.: "The CHORUS experiment to search for nu_<mu>*nu_<tau> oscillation" Nucl.Inst.Meth.A401. 7-44 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] E.Eskut, et al.: "A search for nu_<mu>*nu_<tau> oscillation" Phys.Lett.B424. 202-212 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] P.Annis, et al.: "Obersvation of neutrino induced diffractive D_s^<*+> production and subsequent decay D_S^<*+>*D^s^+*tau^+*mu^+" Phys.Lett.B435. 558-464 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] E.Eskut, et al.: "Search for Search for nu_<mu>*nu_<tau> using the tau decay modes into a single get parcharticle." Phys.Lett.B434. 205-213 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] S.Aoki, et al.: "Quaifree p (K^-, K^+) XI^- reaction in nuclear emulsion" Nuclear Physics. A644. 365-385 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] E.Eskut et al.: "Observation of neutrino induced diffractive D_s^<+*> production in neutrino production and subsequent decay D_s^**D_s*tau*mu" Phys.Lett.B435. 458-464 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] S.Aoki: "Quaifree p(K・,K^+)Ξ^+ reaction in nuclear emulsion" Nuclear Physics. A644. 365-385 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] E.Eskut: "Search for Search for ν_μ→ν_τ using the τ decay modes into a single charged particle." Phys.Lett.B434. 205-213 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] P.Annis: "Obersvation of neutrino induced diffractive D_s^<*+> production and subsequent decay D_s^<*+>→D_S^+→τ^+→μ^+" Phys.Lett.B435. 558-464 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] E.Eskut: "A search for ν_μ→ν_τ oscillation" Phys.Lett.B424. 202-212 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] E.Eskut et al.: "The CHORUS experiment to search for νμ→ντ oscillation." Nucl.Inst.Meth.A401. 7-44 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] E.Eskut et al.: "Search for νμ→ντ oscillation by the CHORUS experiment." Phys.Lett.(in press).

    • Related Report
      1997 Annual Research Report
  • [Publications] 丹羽公雄: "理化学辞典" 岩波書店(共著), (1998)

    • Related Report
      1997 Annual Research Report

URL: 

Published: 1997-04-01   Modified: 2016-09-16  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi