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Study on electro-magnetic calorimeter with lead fluorite crystal

Research Project

Project/Area Number 12640300
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 InstitutionHigh Energy Accelerator Research Organization

Principal Investigator

INAGAKI Taroo  High Energy Accelerator Research Organization, Institute for Pastide and Nuclear Studies, Professor, 素粒子原子核研究所, 教授 (60044757)

Co-Investigator(Kenkyū-buntansha) YOSHIMURA Yoshie  High Energy Accelerator Research Organization, Institute for Pastide and Nuclear Studies, Professor, 素粒子原子核研究所, 教授 (50013397)
Project Period (FY) 2000 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 2001: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 2000: ¥1,600,000 (Direct Cost: ¥1,600,000)
Keywordsoptical crystal / radiation detector / calorimetry / チェレンコフ発光体
Research Abstract

The purpose of the present study is to establish the method to make lead fluoride crystal and to find application to calorimetric detector of the high energy particle. Since lead-fluoride crystal has no scintillation, it will be used as a Cherenkov radiator. The properties of lead fluoride are quite different from those of lead-glass which is widely used. It has heavier density, larger refractive index and better transparency in short wave length of light and has been expected to improve high-energy calorimetric detection using Cherenkov light. Ai first we studied the fabrication method of lead fluoride crystal and finally obtained nine samples of 2 X 2 X 10 cm^3. They are very transparent and show a good property comparable to the world best crystals. We found also non-easiness for fabrication of large crystal. Most of samples are broken during polish. This is due to the fact that an internal stress remains after the process of cool-down from high temperature to grow crystal. Since lead fluoride has two different crystal structures in high and room temperature, two structure can co-exist in one crystal for the cool-down crystals. We tried to find a method to avoid the co-existence by changing the cool-down speed, but the best way has not yet been established. For the nine samples, we performed a test using a high energy beam of electrons, pions and muons in November 2001. The data are being analyzed now. Moreover, we studied a possibility to use as a tool to separate neutron and gamma of GeV energy by stacking scintillator and cherenkov radiators. Lead fluorite is a possible candidate of the cherenkov radiator. The results of its model test was published.

Report

(3 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • Research Products

    (3 results)

All Other

All Publications (3 results)

  • [Publications] 渡辺文晃: "Scintillator-Lucite sandwich detector for n/y Separation in the Gev energy region"Nuclear Instruments and Method プレプリント KER Preprint 2001-51. (発行待ち).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H. Watanabe et al.: "Scintillator - Lucite sandwich detector for n/γ separation in the GeV energy region"Nuclear Instruments and Methods. KEK Preprint 2001-52 (to be published).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 渡辺丈晃: "Scintillator-Lucite Sandwich detector for n/γ separation in the GeV energy region"Nuclear Instruments and Method プレプリント KEK Preprint 2001-51. (発行待ち).

    • Related Report
      2001 Annual Research Report

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Published: 2000-04-01   Modified: 2016-04-21  

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