EVIDENCE FOR ABSORPTION EFFECTS IN POSITRON ELASTIC-SCATTERING BY ARGON

被引：29

作者：

SMITH, SJ ^{[1
]}

HYDER, GMA ^{[1
]}

KAUPPILA, WE ^{[1
]}

KWAN, CK ^{[1
]}

STEIN, TS ^{[1
]}

机构：

[1] WAYNE STATE UNIV,DEPT PHYS & ASTRON,DETROIT,MI 48202

来源：

PHYSICAL REVIEW LETTERS | 1990年 / 64卷 / 11期

关键词：

D O I：

10.1103/PhysRevLett.64.1227

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Relative differential cross sections for elastic scattering of 550-eV positrons by argon atoms at angles from 30°to 134°are measured in a crossed-beam experiment. These measurements provide strong evidence that the positronium formation channel (threshold=9.0 eV) is having a significant absorption effect on the elastic-scattering channel, as is observed by the washing out of clear structure (a maximum and minimum) present in the measured elastic differential cross section below 9.0 eV (where good agreement is found with theory) when the positron energy is increased to higher energies. © 1990 The American Physical Society.

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页码：1227 / 1230

页数：4

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