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Development of the Ultra-lav Backgnund Drerctor for neutrinc and clark matter study

Research Project

Project/Area Number 10640269
Research Category

Grant-in-Aid for Scientific Research (C)

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

Principal Investigator

OGAWA Izumi  Graduated School of Science, Osaka University Research Associate, 大学院・理学研究科, 助手 (20294142)

Co-Investigator(Kenkyū-buntansha) AJIMURA Shuhei  Graduated School of Science, Osaka University Research Associate, 大学院・理学研究科, 助手 (10273575)
SAKAGUCHI Atsushi  Graduated School of Science, Osaka University Assistant Professor, 大学院・理学研究科, 助教授 (70205730)
KISHIMOTO Tadafumi  Graduated School of Science, Osaka University Professor, 大学院・理学研究科, 教授 (90134808)
Project Period (FY) 1998 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 1999: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1998: ¥2,800,000 (Direct Cost: ¥2,800,000)
KeywordsDark Matter / neutrino mass / WIMP / double beta decay / CaF_2結晶 / wavelength shifter
Research Abstract

We have developed a CaFィイD22ィエD2 scintillation detector system (ELEGANTVI) to search for neutrino-less double beta decay of ィイD148ィエD1Ca and spin coupled dark matter by elastic scattering of ィイD119ィエD1F. The whole system is in operation at the underground laboratory located in Nara (Oto Cosmo Observatory). To improve the sensitivity of the detector system, we must increase the number of target nuclei. As a result, The size of the detector system becomes larger which brings the complexity and large costs. To suppress these, we employ a new design of the detector system which consists of CaFィイD22ィエD2 (pure) crystals surrounded by a liquid scintillator as an active 4π-shield.
We constructed a test bench system to study the characteristics of this system for future larger detector. One or more CaFィイD22ィエD2 (pure) crystal (s) surrounded by a liquid scintillator are viewed by 4 (5")PMTs. The best value of the concentration of a scintillating solute was obtained by measuring the light yield with varying the concentration. By measuring the decay time of pulses, we can discriminate the signal from the CaFィイD22ィエD2 (pure) scintillator and from the liquid scintillator.
We are now studying the best method to discriminate signal from noise by using test bench system.

Report

(3 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] Ogawa, I., et al.: "Dark matter scarch and measurement of double betadecay by ELEGANT VI"RCNP annual report, Osaka University. 35-36 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] R. Hazama., et al.: "Dark matter scarch with CaF_2 Santillator at Oto Cosmo Observatory"OULNS annal report, Osaka University. 10-12 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y. Ishikawa, et al.: "Transmittance of optical glues for CaF_2 Scintillator"OULNS annal report, Osaka University. 13-15 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] M. Itamura, et al.: "Improvement of CaF_2 Scintillator by means of Flash Scaler"OULNS annal report, Osaka University. 16-17 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] I. Ogawa, et al.: "Dark matter scarch with CaF_2 Santillator at Osaka"Proc. Of the XVth Particles and Nuclei International Coference (PANC'99). (予定). (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Ogawa, I, et al.: "Dark matter secarch and measuremeat of double beta decay by ELEGANT VI"RCNP annual report, Osalca Univ.. 35-36 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] R. Hazama, et al.: "Dark matter search with CaFィイD22ィエD2 Scintillator at Oto Cosmo Observatory"OVLNS annual report, Osaka Univ.. 10-12 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y. Ishikawa, et al.: "Transmittance of optical glues for CaFィイD22ィエD2 Scintillator"OVLNS annual report, Osaka Univ.. 13-15 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] M. Itamura, et al.: "Improvement of CaFィイD22ィエD2 Scintillator by Means of Flash Scaler"OVLNS annual report, Osaka Univ.. 16-17 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] I. Ogawa, et al.: "Dark matter search with CaFィイD22ィエD2 Scintillator at Osaka"Proc. of the XVth Particles and Nuclei International Conterencc(PANIC99) Uppsala, Sweden., June10-16. (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary

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Published: 1998-04-01   Modified: 2016-04-21  

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