Analysis of 3γ/2γ ratio in the measurement of positron annihilation Doppler-broadening spectroscopy

被引：0

作者：

Zhou, CL ^{[1
]}

Zhang, TB ^{[1
]}

Ma, CX ^{[1
]}

Zhang, ZM ^{[1
]}

Cao, XZ ^{[1
]}

Wang, BY ^{[1
]}

Wei, L ^{[1
]}

机构：

[1] CAS, Inst High Energy Phys, Lab Nucl Analyt Technol, Beijing 100049, Peoples R China

来源：

HIGH ENERGY PHYSICS AND NUCLEAR PHYSICS-CHINESE EDITION | 2006年 / 30卷 / 01期

关键词：

slow positron beam; pore; positronium; mesoporous material; film;

D O I：

暂无

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

Doppler-broadening slow positron annihilation spectroscopy is used to measure the concentration, spatial distribution, and size of open-volume defects in surface and interface of material. In this method, the quantitative evaluation is generally carried out with the line shape parameter S and W, but sometimes the parameters provide some finite information. For example, if positron and electron form positronium (include o-Ps and p-Ps) in material, the parameters S and W may provide little information about positronium even complicate the analyses. A parameter I-3 gamma, defined as o-Ps self-decay intensity, was used to analyze Ag layer capped and non-capped silica aerogel by slow positron annihilation Doppler-broadening spectroscopy. The result shows that I-3 gamma can provide more information for researching mesoporous material and nanometer film.

引用

页码：84 / 87

页数：4

共 8 条

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