Temperature and irradiation effects on positronium formation in polycarbonate

被引：9
|
作者：
Chen, ZQ
Suzuki, T
Uedono, A
Tanigawa, S
Ito, Y
机构：
[1] Univ Tsukuba, Inst Phys, Tsukuba, Ibaraki 3058573, Japan
[2] KEK, Radiat Sci Ctr, Tsukuba, Ibaraki 3050801, Japan
[3] Univ Tokyo, Res Ctr Nucl Sci, Tokai, Ibaraki 3191106, Japan
来源：
POSITRON ANNIHILATION - ICPA-12 | 2001年 / 363-3卷
关键词：
free volume; polycarbonate; positron annihilation;
D O I：
10.4028/www.scientific.net/MSF.363-365.297
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
Positron annihilation lifetime spectra were measured for polycarbonate as a function of temperature and measuring time. Free radicals and trapped electrons were introduced by positron irradiation at room temperature and low temperature, respectively. Free radicals prohibited the formation of positronium (Ps), while the trapped electrons enhanced the Ps formation. A new transition was observed at 230K, which was attributed to the brittle ductile transition.
引用
收藏
页码：297 / 299
页数：3
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