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1995 Fiscal Year Final Research Report Summary

Search for galactic dark matter and double beta decay measurement using a detector of new principle

Research Project

Project/Area Number 04402005
Research Category

Grant-in-Aid for General Scientific Research (A)

Allocation TypeSingle-year Grants
Research Field 核・宇宙線・素粒子
Research InstitutionThe University of Tokyo

Principal Investigator

MINOWA Makoto  School of Science, University of Tokyo, Associate Professor, 大学院・理学系研究科, 助教授 (90126178)

Project Period (FY) 1992 – 1995
Keywordsdark matter / bolometer / supersymmetry / neutralino / cryogenic detector / thermistor / fluorine
Research Abstract

A dedicated dilution refrigerator has been constructed. It is capable of cooling the detector material down to 10mK.It is made of specially selected raw materials to reduce natural radiation background from them.
In order to manufacture thermistors with high sensitivities at low temperature, neutron transmutation doping method was adopted.Neutron irradiation has been done at the JRR-3 reactor of the Japan Atomic Energy Reasearch Institute.
Using these building elements, we developed cryogenic particle detectors consisting of 8 pieces of 20-gram lithium fluoride bolometers. The lithium fluoride is known to be the material which has the largest cross section for the detection of spin dependently interacting supersymmetric neutralinos. With these detectors a direct experimental search for supersymmetric particle dark matter has been performed and is still ongoing in the Nokogiri-yama underground cell of the institute for the Cosmic Ray Research, University of Tokyo.
On the basis of a pilot run, limits were obtained on normalized point-like cross section for the spin-dependently interacting neutralino incident on a single proton, although the dark matter is not yet deiscovered.While the shielding against back-ground radiation is not fully optimized yet, our search gave the worls best limits for the spin-dependently interacting neutralino with a mass lower than 5 GeV.It demonstrates the advantages of using the fluorine for the target and the low energy threshold of the bolometer. Thwe search continues with the improved shielding and more efficient veto counters.

  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] Makoto MINOWA, Wataru OOTANI, Takayuki WATANABE, Yutaka ITO, Yasuhiro KISHIMOTO, Yoshizumi INOUE and Youiti OOTUKA: "Tokyo Cryogenic Dark Matter Search Experiment with Fluorine" Proc.2nd RESCEU International Symposium on Dark Matter in the Universe and its Direct Detection. 77-81

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] W.Ootani, M.Minowa, T.Watanabe, Y.Ito, Y.Kishimoto, K.Miuchi, Y.Inoue, Y.Ootuka: "Performance of a Lithium Fluoride Bolometer for Tokyo Dark Matter Search Experiment" RESCEU Preprint RESCEU-35/97,accepted for the publication in Astroparticle Physics.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Minowa, W.Ootani, Y.Ito, Y.Kishimoto, T.Watanabe, Y.Inoue,and Y.Ootuka: "Status of Tokyo Dark Matter Search Experiment,Dark Matter in Astro- and Particle Physics (DARK'96)" Editors: H.V.Klapdor-Kleigrothaus and Y.Ramachers, Heidelberg,(1997,World Scientific). 532-535

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 箕輪 眞: "暗黒物質の直接検出実験" 高エネルギーニュース. 16. 193-200 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 箕輪 眞: "暗黒物質の検出" 数理科学. 第35巻8号. 47-51 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Makoto MINOWA,Wataru OOTANI,Takayuki WATANABE,Yutaka ITO,Yasuhiro KISHIMOTO,Yoshizaki INOUE and Youiti OOTUKA: "Tokyo Cryogenic Dark Matter Search Experiment with Fluorine" Proc.2nd RESCEU International Symposium on Dark Matter in the Universe and its Direct Detection. 77-81

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] W.Ootani, M.Minowa, T.Watanabe, Y.Ito, Y.Kishimoto, K.Miuchi, Y.Inoue, Y.Ootuka: "Performance of a Lithium Fluoride Bolometer for Tokyo Dark Matter Search Experiment" RESCEU Preprint RESCEU-35/97. (accepted for the publication in Astroparticle Physics.).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Minowa, W.Ootani, Y.Ito, Y.Kishimoto, T.Watanabe, Y.Inoue, and Y.Ootuka: "Status of Tokyo Dark Matter Search Experiment, Dark Matter in Astro-and Particle Physics (DARK'96)" Editors : H.V.Klapdor-Kleigrothaus and Y.Ramachers, Heidelberg, (1997, World Scientific). 532-535

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-03-16  

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