New positron lifetime spectrometer with the coincidence of energy selected positron and the annihilation photon
新型正电子寿命谱仪,能量选择正电子与湮没光子重合
基本信息
- 批准号:07555188
- 负责人:
- 金额:$ 5.57万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (A)
- 财政年份:1995
- 资助国家:日本
- 起止时间:1995 至 1996
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
In order to achieve in-situ studies of condensed matter under extremeconditions, new beta^+-gamma conicidence lifetime spectrometer with the coincidence of energy-selected positron and the annihilation photon has been constructed. The whole apparatus is desk-top and low cost, since it does not need any accelerators but a small sealed positron-source and a pair of magnetic lenses. Specimens can be exposed to any extreme surrounding conditions without the risk of contamination by radioactive materials, since the specimen part is independent and well-separated from the sealed positron-source. In order to overcome the inevitable deterioration of time resolution due to the spread of TOF (time of flight) of positrons emitted from radioisotopes, positrons in a certain energy band are selected using magnetic field. The total efficiency (more than 10^<-3> of positrons from the source can be focused on a specimen) is much superior to that expected for the case of re-acceleration of moderated positrons. The time resolution of the whole system with a 10mCi^<22> Na positron source is about 385ps (FWHM) as yet, which is worse than that of the conventional gamma-gamma coincidence method (around 200ps FWHM typically) but bears comparison with former beta^+-gamma coincidence lifetime spectrometers using close geometry between the positron source and a specimen.
为了实现对极端条件下凝聚态物质的原位研究,我们研制了一种新的能量选择正电子与湮灭光子符合的β ^+-γ符合寿命谱仪。整个装置不需要加速器,只需要一个小型密封正电子源和一对磁透镜,是台式的,成本低。样品可以暴露在任何极端的环境条件下,而没有被放射性物质污染的风险,因为样品部分是独立的,与密封的正电子源分离良好。为了克服由于放射性同位素发射的正电子的飞行时间(TOF)的扩展而导致的时间分辨率的不可避免的劣化,使用磁场来选择特定能带中的正电子。总的效率(超过10^<-3>的正电子从源可以集中在一个标本)是上级的情况下,预期的再加速慢化正电子。采用10 mCi ^ Na正电子源的整个系统的时间分辨率<22>约为385 ps(FWHM),比传统的γ-γ符合方法(FWHM约为200 ps)要差,但可以与正电子源和样品之间采用紧密几何结构的β ^+-γ符合寿命谱仪相比较。
项目成果
期刊论文数量(1)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Yasuharu Shirai: "Construction of Positron-Beam Apparatus for In-Situ Studies of Lattice Defects in Materials" The PRODUCTION & TECHNIQUE. Vol.48, No.4. 50-52 (1996)
Yasuharu Shirai:“用于材料晶格缺陷原位研究的正电子束装置的构建”
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SHIRAI Yasuharu其他文献
SHIRAI Yasuharu的其他文献
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{{ truncateString('SHIRAI Yasuharu', 18)}}的其他基金
"Transformation - Induced Vacancy" - A New Vacancy Formation Mechanism and Its Function in Materials -
“相变-诱导空位”-一种新的空位形成机制及其在材料中的作用-
- 批准号:
24246105 - 财政年份:2012
- 资助金额:
$ 5.57万 - 项目类别:
Grant-in-Aid for Scientific Research (A)
Construction of a non-destructive evaluation system of materials in use by using positrons
利用正电子构建在用材料无损评价系统
- 批准号:
14350370 - 财政年份:2002
- 资助金额:
$ 5.57万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
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
构建具有β^<+->γ符合和正电子能量选择的台式移动正电子寿命谱仪,用于晶格缺陷的原位研究
- 批准号:
10555212 - 财政年份:1998
- 资助金额:
$ 5.57万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Constitutional and/or Thermal Vacancies in some Intermetallic Compounds
某些金属间化合物中的结构空位和/或热空位
- 批准号:
08455289 - 财政年份:1996
- 资助金额:
$ 5.57万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Construction of a Positron Lifetime Spectrometer with beta^+-gamma coincidence for in-situ studies of lattice Defect
构建用于晶格缺陷原位研究的β^-γ符合的正电子寿命谱仪
- 批准号:
05555167 - 财政年份:1993
- 资助金额:
$ 5.57万 - 项目类别:
Grant-in-Aid for Developmental Scientific Research (B)
Study of Point Defects in B2-type Ordered Alloys by Means of Positron Annihilation
正电子湮灭研究B2型有序合金点缺陷
- 批准号:
61550480 - 财政年份:1986
- 资助金额:
$ 5.57万 - 项目类别:
Grant-in-Aid for General Scientific Research (C)
Nucleation Process of Voids Studied by Positron Lifetime Spectroscopy
正电子寿命谱研究空洞成核过程
- 批准号:
60550459 - 财政年份:1985
- 资助金额:
$ 5.57万 - 项目类别:
Grant-in-Aid for General Scientific Research (C)
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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
构建具有β^<+->γ符合和正电子能量选择的台式移动正电子寿命谱仪,用于晶格缺陷的原位研究
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