Production of collimated positronium by positron scattering from CO2, N2 and Xe

被引：9
|
作者：
Shipman, M. [1 ]
Brawley, S. [1 ]
Leslie, D. E. [1 ]
Armitage, S. [1 ]
Laricchia, G. [1 ]
机构：
[1] UCL, UCL Dept Phys & Astron, London WC1E 6BT, England
来源：
EUROPEAN PHYSICAL JOURNAL D | 2012年 / 66卷 / 04期
基金：
英国工程与自然科学研究理事会;
关键词：
IMPACT IONIZATION; PS BEAM; ATOMS; MOLECULES; GASES; COLLISIONS;
D O I：
10.1140/epjd/e2012-20753-9
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
The efficiency for collimated positronium production by charge-exchange in positron collisions with gaseous targets has been investigated in the range 20-396 eV. At 250 and 396 eV, CO2 has been found to be approximately twice as efficient as N-2, the previous best neutralising gas at high energies. The efficiency from Xe, whilst lower at low energies, becomes comparable to that from H-2 at around 100-120 eV; at similar to 250 eV, it is an order of magnitude lower.
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页数：5
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