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
收藏
页码：33 / 46
页数：14
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