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Title: Convergent close-coupling calculations of positron scattering on metastable helium

Abstract

The convergent close-coupling method has been applied to positron scattering on a helium atom in the 2 {sup 3}S metastable state. For this system the positronium (Ps) formation channel is open even at zero scattering energy making the inclusion of the Ps channels especially important. Spin algebra is presented for the general case of arbitrary spins. A proof is given of the often-used assumption about the relationship between the amplitudes for ortho-positronium and para-positronium formation. The cross sections for scattering from 2 {sup 3}S are shown to be significantly larger than those obtained for the ground state.

Authors:
; ; ; ;  [1]
  1. ARC Centre for Antimatter-Matter Studies, Department of Applied Physics, Curtin University, Perth 6152 (Australia)
Publication Date:
OSTI Identifier:
21450774
Resource Type:
Journal Article
Journal Name:
Physical Review. A
Additional Journal Information:
Journal Volume: 82; Journal Issue: 4; Other Information: DOI: 10.1103/PhysRevA.82.042705; (c) 2010 The American Physical Society; Journal ID: ISSN 1050-2947
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; ALGEBRA; AMPLITUDES; ATOMS; COUPLING; CROSS SECTIONS; HELIUM; METASTABLE STATES; POSITRON-ATOM COLLISIONS; POSITRONIUM; POSITRONS; S STATES; SCATTERING; SPIN; ANGULAR MOMENTUM; ANTILEPTONS; ANTIMATTER; ANTIPARTICLES; ATOM COLLISIONS; COLLISIONS; ELEMENTARY PARTICLES; ELEMENTS; ENERGY LEVELS; EXCITED STATES; FERMIONS; FLUIDS; GASES; LEPTONS; MATHEMATICS; MATTER; NONMETALS; PARTICLE PROPERTIES; POSITRON COLLISIONS; RARE GASES

Citation Formats

Utamuratov, R, Kadyrov, A S, Fursa, D V, Bray, I, and Stelbovics, A T. Convergent close-coupling calculations of positron scattering on metastable helium. United States: N. p., 2010. Web. doi:10.1103/PHYSREVA.82.042705.
Utamuratov, R, Kadyrov, A S, Fursa, D V, Bray, I, & Stelbovics, A T. Convergent close-coupling calculations of positron scattering on metastable helium. United States. https://doi.org/10.1103/PHYSREVA.82.042705
Utamuratov, R, Kadyrov, A S, Fursa, D V, Bray, I, and Stelbovics, A T. 2010. "Convergent close-coupling calculations of positron scattering on metastable helium". United States. https://doi.org/10.1103/PHYSREVA.82.042705.
@article{osti_21450774,
title = {Convergent close-coupling calculations of positron scattering on metastable helium},
author = {Utamuratov, R and Kadyrov, A S and Fursa, D V and Bray, I and Stelbovics, A T},
abstractNote = {The convergent close-coupling method has been applied to positron scattering on a helium atom in the 2 {sup 3}S metastable state. For this system the positronium (Ps) formation channel is open even at zero scattering energy making the inclusion of the Ps channels especially important. Spin algebra is presented for the general case of arbitrary spins. A proof is given of the often-used assumption about the relationship between the amplitudes for ortho-positronium and para-positronium formation. The cross sections for scattering from 2 {sup 3}S are shown to be significantly larger than those obtained for the ground state.},
doi = {10.1103/PHYSREVA.82.042705},
url = {https://www.osti.gov/biblio/21450774}, journal = {Physical Review. A},
issn = {1050-2947},
number = 4,
volume = 82,
place = {United States},
year = {Fri Oct 15 00:00:00 EDT 2010},
month = {Fri Oct 15 00:00:00 EDT 2010}
}