Coupling between positronium formation and elastic positron-scattering channels in the rare gases

被引：20

作者：

Jay, P. M. ^{[1
]}

Coleman, P. G. ^{[1
]}

机构：

[1] Univ Bath, Dept Phys, Bath BA2 7AY, Avon, England

来源：

PHYSICAL REVIEW A | 2010年 / 82卷 / 01期

关键词：

LOW-ENERGY POSITRONS; CROSS-SECTIONS; THRESHOLD; HELIUM;

D O I：

10.1103/PhysRevA.82.012701

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Measurements of elastic-scattering cross sections are presented for positron collisions with helium, neon, argon, krypton, and xenon around the threshold energy for positronium (Ps) formation. The elastic cross section falls slowly with increasing energy above the Ps formation threshold in helium and neon, whereas in argon, krypton, and xenon it exhibits an increase, which appears both more prominent and more sustained as the atomic number of the gas increases. It is proposed that this coupling is a result of an intermediate virtual Ps state that enhances branching into the (atom plus positron) final state.

引用

页数：3

共 14 条

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