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Construction of a desk-top-sized and mobile positron lifetime spectrometer with β^<+->γ coincidence and positron energy selection for in-situ studies of lattice defects

Research Project

Project/Area Number 10555212
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section展開研究
Research Field Physical properties of metals
Research InstitutionOsaka University

Principal Investigator

SHIRAI Yasuharu  Department of Materials Science and Engineering, Osaka University, Professor, 大学院・工学研究科, 教授 (20154354)

Co-Investigator(Kenkyū-buntansha) ARAKI Hideki  Department of Materials Science and Engineering, Osaka University, Associate Professor, 大学院・工学研究科, 助教授 (20202749)
Project Period (FY) 1998 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥12,100,000 (Direct Cost: ¥12,100,000)
Fiscal Year 1999: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1998: ¥10,700,000 (Direct Cost: ¥10,700,000)
Keywordspositron beam / positron lifetime / β^<+->γ coincidence / lattice defect / non-destructive testing / 陽電子ビーム / 格子欠陥 / 陽電子寿命
Research Abstract

The positron lifetime measurement is a non-destructive method for sensitively detecting and differentiating crystal lattice defects with size of nanometer order in materials. In the conventional positron lifetime measurement it is necessary to sandwich a positron source between two identical pieces of sample material, because all positrons emitted in all directions from the positron source have to annihilate with electrons in the sample material. It is therefore quite difficult to measure positron lifetime in the place where the sample exists, without cutting two pieces out of the sample material.
We have constructed a new β^<+->γ coincidence lifetime spectrometer with positron energy selection in order to achieve in-situ measurement of positron lifetime. In the spectrometer a positron source is placed well apart from the sample. The positrons emitted from the positron source are selected in energy by a magnetic lens and only the positrons with a certain energy are led to an advanced photo diode. When the positron passes through the diode, it gives a start signal to the coincidence circuit. The positron that passed through the positron detector is again focused on the sample by a magnetic lens. The positron annihilates with an electron in the sample. The annihilation photon is detected to use as a stop signal. The new positron lifetime spectrometer with fast positron beam is desk-top-sized and can be easily carried.

Report

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

    (16 results)

All Other

All Publications (16 results)

  • [Publications] Hideki Araki: "Positron Annihilation study of the cantaion in 5083 Superplastic Aluminum Alloy"Materials Science Forum. 304-306. 705-710 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Yasuharu Shirai: "Point Defects and Diffusion in Ni_3Ga"Mat.Res.Soc.Symp.Proc.. 527. 179 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 荒木秀樹,白井泰治: "アバランシェ・フォトダイオード(APD)による陽電子の検出"KEK Proceedings. 98.No.6. 21-23 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 荒木秀樹,白井泰治: "いくつかのアモルファス合金の構造緩和,ガラス化,結晶化過程の陽電子消滅による研究"KEK Proceedings. 98.No.6. 73-75 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 荒木秀樹,白井泰治: "B2型金属間化合物CoTi中の構造空孔と熱平衡空孔"KEK Proceedings. 98.No.6. 82-84 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 荒木秀樹,白井泰治: "超塑性材料の粒界に存在する空孔型欠陷の陽電子寿命測定"KEK Proceedings. 98.No.6. 85-87 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Yasubaru Shirai: "Constitutional and/or Thermal Vacancles in some B2 Intermetallic Compounds Studied by Positron Lifetime Spectrometry"Proceedings of the U.S.-Japan Workshop on Very High Temperature Structural Materials. 135-138 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Hideki Araki Yasuharu Shirai: "Pre-Martensitic Phenomenon in NiTi Studied by Positron Lifetime Spectroscopy"Materials Science Forum. 327-328. 437-440 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Hideki Araki: "Positron Annihilation Study of the Cavitation in 5083 Superplastic Aluminum Alloy"Materials Science Forum. Vol.304-306. 705-710 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Teruyuki Ikeda: "Point Defects and Diffusion in Ni_3Ga"Mat.Res.Soc.Symp.Proc.. Vol.527. 179 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Masao Yuga: "Detection of positron with a advanced photo diode"KEK Proceedings. Vol.98, No.6. 21-23 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Nobuhiro Okada: "Positron annihilation study of crystallization of some amorphous materials"KEK Proceedings. Vol.98, No.6. 73-75 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Kouichi Mikado: "Constitutional and thermal vacancies in B2 intermetallic compound CoTi"KEK Proceedings. Vol.98, No.6. 82-84 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Norihisa Matake: "Positron annihilation study of lattice defects at grain boundaries in superplastic mateials"KEK Proceedings. Vol.98, No.6. 85-87 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Yasuharu Shirai: "Constitutional and/or Thermal vacancies in some B2 Intermetallic Compounds Studied by Positron Lifetime Spectrometry"Proceedings of the U.S.-Japan Workshop on Very High Temperature Structural Materials. 135-138 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Hideki Araki: "Pre-Martensitic Phenomenon in NiTi Studied by Positron Lifetime Spectroscopy"Materials Science Forum. Vols.327-328. 437-440 (2000)

    • 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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