Progress with the Schwinger multichannel method in positron-molecule scattering

被引：47

作者：

de Carvalho, CRC

Varella, MTD

Lima, MAP ^{[1
]}

da Silva, EP

Germano, JSE

机构：

[1] Inst Fis Gleb Wataghin, BR-13083970 Campinas, SP, Brazil

[2] Univ Fed Ceara, Dept Fis, BR-60455760 Fortaleza, Ceara, Brazil

[3] CTA, Ctr Techn Aerospacial, Dept Fis, Inst Tecnol Aeronaut, BR-12228900 Sao Jose Dos Campos, Brazil

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS | 2000年 / 171卷 / 1-2期

基金：

巴西圣保罗研究基金会;

关键词：

positron; annihilation; positron-molecule scattering;

D O I：

10.1016/S0168-583X(00)00036-7

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

We report calculations for low-energy positron-C2H2 and -N-2 scattering obtained through the Schwinger multichannel method (SMC). Integral and differential cross-sections and the annihilation parameter, Z(eff), are presented. For nitrogen, evidence of a Ramsauer-Townsend minimum and the possibility of overcorrelation in the scattering configuration space are discussed. Annihilation probability densities (APD) calculated for He and H-2 Seem to bring indirect support to a model previously proposed to explain why acetylene, unlike nitrogen, presents very high low-energy annihilation rates. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：33 / 46

页数：14

共 24 条

[1]

BRANDT W, 1983, INT SCH PHYSICS E FE

[2] TOTAL SCATTERING CROSS-SECTIONS FOR LOW-ENERGY POSITRONS IN THE MOLECULAR GASES H-2,N-2,CO2,O-2 AND CH4 [J].