Energy-resolved positron annihilation in flight in solid targets

被引：12
|
作者：
Weber, MH [1 ]
Hunt, AW
Golovchenko, JA
Lynn, KG
机构：
[1] Washington State Univ, Dept Phys, Pullman, WA 99164 USA
[2] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA
[3] Rowland Inst Sci Inc, Cambridge, MA 02142 USA
来源：
PHYSICAL REVIEW LETTERS | 1999年 / 83卷 / 22期
关键词：
D O I：
10.1103/PhysRevLett.83.4658
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Energy-resolved two-quantum annihilation in flight of positrons with energies ranging from 10 to 71.6 keV was observed. An energy-dispersive two-detector coincidence system was used to observe the sum and difference energies of the gamma rays from annihilating positron-electron pairs. For positrons penetrating carbon foils the c/upsilon dependence of the annihilation cross section is confirmed. Spectra obtained from gold-coated carbon foils show evidence of in-flight annihilation with gold M-shell electrons.
引用
收藏
页码：4658 / 4661
页数：4
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