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1992 Fiscal Year Final Research Report Summary

Development of cooled scintillators for dark matter detection

Research Project

Project/Area Number 03452020
Research Category

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

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

Principal Investigator

MINOWA Makoto  University of Tokyo, School of Science, Associate Professor, 理学部, 助教授 (90126178)

Co-Investigator(Kenkyū-buntansha) WATANABE Takayuki  University of Tokyo, School of Science, Research Associate, 理学部, 助手 (80202414)
Project Period (FY) 1991 – 1992
KeywordsCooled Scintillator / Cesium Iodide / Lead Molybdate / Lead Tungstate / Dark Matter / Double Beta Decay
Research Abstract

We confirmed that an undoped cesium iodide crystal is a very efficient scintillator if it is cooled down to the liquid nitrogen temerature.
We newly found that a cooled monocrystal of lead molybdate also functions as a scintillator at temperature below 100K.Since it contains molybdenum-100, a double beta decay nuclide, it may open new perspective of the double beta decay experiments. We performed a short term experiment with this crystal for the evaluation, and obtained 8.9*10^<17> for the lower limit of the half life of ^<100>Mo double beta decay. We also found that lead-210 impurity in the crystal is the limitting factor of the experiment.
A lead tungstate, similar material to the lead molybdate, is found to be also a scintillator below 100K.

  • Research Products

    (2 results)

All Other

All Publications (2 results)

  • [Publications] M.Minowa et al.: "Mesurement of the property of cooled lead molybdate as a scintillator" Nuclear Instruments and Methods in Physics Research. A320. 500-503

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Minowa, K.Itakura, S.Moriyama and W.Ootani: "Measurement of the property of cooled lead molybdate as a scintillator" Nuclear Instruments and Methods in Physics Research. A320. 500-503 (1992)

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

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Published: 1999-03-09  

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