TIME-DEPENDENT DIFFUSION AND ANNIHILATION OF POSITRONS IMPLANTED IN A SEMI-INFINITE MEDIUM

被引:20
作者
BRITTON, DT
机构
[1] Inst. fur Nukleare Festkorperphys., Univ. der Bundeswehr Munchen, Neubiberg
关键词
D O I
10.1088/0953-8984/3/6/006
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
Annihilation spectra, resulting from the implantation of mono-energetic positrons in a perfect homogeneous solid, have been modelled allowing for the transport of both thermal and epithermal positrons. The resulting curves resemble a sum of two exponential components, although the intensities are not simply related to the positron back-diffusion probability. Because of the very short times involved, the effects of non-thermal positron transport are less significant than for steady-state diffusion models. At room temperature, internal reflection of thermal positrons at the surface has little effect on the solution to the diffusion equation for deeply implanted positrons.
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页码:681 / 692
页数:12
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