EFFECT OF OXYGEN IMPURITIES ON POSITRONIUM FORMATION IN VOIDS OF VANADIUM

被引：0
|
作者：
HASEGAWA, M
SAITOH, Y
YOSHINARI, O
MATSUI, H
TAKAHASHI, H
OHNUKI, S
YAMAGUCHI, S
机构：
[1] HOKKAIDO UNIV,FAC ENGN,MET RES INST,SAPPORO,HOKKAIDO 060,JAPAN
[2] NAGOYA INST TECHNOL,DEPT MAT SCI & ENGN,NAGOYA,AICHI 466,JAPAN
来源：
SCIENCE REPORTS OF THE RESEARCH INSTITUTES TOHOKU UNIVERSITY SERIES A-PHYSICS CHEMISTRY AND METALLURGY | 1991年 / 35卷 / 02期
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D O I：
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中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
To clarify the effect of oxygen impurities on positronium (Ps) formed in irradiation-induced voids, measurements of the angular correlation of two photon annihilation radiation (ACAR) have been done on vanadium samples doped with oxygen impurities and subsequently irradiated with fast neutrons of doses up to 5.5 x 10(20)cm-2 at about 400-degrees-C in the Japan Materials Testing Reactor (JMTR). It has been shown that slight contamination of voids with oxygen impurity atoms, presumably submonolayer adsorption on the void surface, causes Ps formation. On the other hand, the considerable contamination leads suppression of Ps formation. Energy loss process of Ps in voids is found to be also influenced by the surface contamination.
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页码：208 / 218
页数：11
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