ZEFF ACCORDING TO THE SCHWINGER MULTICHANNEL METHOD IN POSITRON SCATTERING

Authors
DASILVA EP GERMANO JSE LIMA MAP
Citation
Ep. Dasilva et al., ZEFF ACCORDING TO THE SCHWINGER MULTICHANNEL METHOD IN POSITRON SCATTERING, Physical review. A, 49(3), 1994, pp. 180001527-180001530
Citations number
18
Categorie Soggetti
Physics
Journal title
Physical review. A → ACNP
ISSN journal
10502947
Volume
49
Issue
3
Year of publication
1994
Pages
180001527 - 180001530
Database
ISI
SICI code
1050-2947(1994)49:3<180001527:ZATTSM>2.0.ZU;2-1
Abstract
We use the wave function from the Schwinger multichannel method to cal culate Z(eff)-an annihilation parameter of positron-atom (or molecule) scattering. These Z(eff) are evaluated from the (N+1)-particle wave f unction and are calculated in a fully ab initio way (in a quantum chem istry sense). Our first applications are for positron scattering again st He atoms and H-2 molecules. Our results for both systems are in exc ellent agreement with experimental data at thermal energies.