ANNIHILATION DYNAMICS OF POSITRONS IN MOLECULAR ENVIRONMENTS - THEORETICAL-STUDY OF LOW-ENERGY POSITRON-C2H4 SCATTERING

Authors
DASILVA EP GERMANO JSE LIMA MAP
Citation
Ep. Dasilva et al., ANNIHILATION DYNAMICS OF POSITRONS IN MOLECULAR ENVIRONMENTS - THEORETICAL-STUDY OF LOW-ENERGY POSITRON-C2H4 SCATTERING, Physical review letters, 77(6), 1996, pp. 1028-1031
Citations number
10
Categorie Soggetti
Physics
Journal title
Physical review letters → ACNP
ISSN journal
00319007
Volume
77
Issue
6
Year of publication
1996
Pages
1028 - 1031
Database
ISI
SICI code
0031-9007(1996)77:6<1028:ADOPIM>2.0.ZU;2-G
Abstract
We present a theoretical study of low-energy positron-C2H4 scattering using the Schwinger multichannel method. We calculated integral cross sections and the annihilation parameter Z(eff) for positron impact ene rgies from 0.001 to 6 eV. We have used up to 23 112 configurations in a fully a initio calculation. Our results are in excellent agreement w ith available experimental data. As seen experimentally, at low energi es, our calculated Z(eff) and cross sections are very large. We attrib ute this behavior to virtual positronium formation.