POSITRONIUM DIFFUSION IN SOLIDS

被引：148

作者：

BRANDT, W

PAULIN, R

机构：

[1] Department of Physics, New York University, New York

[2] Institut National des Sciences et Technique Nucleaires, Saclay

来源：

PHYSICAL REVIEW LETTERS | 1968年 / 21卷 / 04期

关键词：

D O I：

10.1103/PhysRevLett.21.193

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The strong dependence of positron annihilation spectra in solid powders on particle size is shown to be indicative of positronium (Ps) diffusion in solids. Ps diffusion constants and mean annihilation lengths are estimated from measurements on powders of SiO2, Al2O3, and MgO. Because of Ps diffusion, positron emitters suspended in powders of very small particles constitute compact high-yield sources of free o-Ps and of gamma rays with continuous energy spectra. © 1968 The American Physical Society.

引用

页码：193 / &