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.

引用

页数：5

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