Convergent close-coupling calculations of positron scattering on metastable helium

Journal Article · Fri Oct 15 00:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.82.042705· OSTI ID:21450774

Utamuratov, R; Kadyrov, A S; Fursa, D V; Bray, I; Stelbovics, A T ^[1]

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1. ARC Centre for Antimatter-Matter Studies, Department of Applied Physics, Curtin University, Perth 6152 (Australia)

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.

• OSTI ID: 21450774
• Journal Information: Physical Review. A, Vol. 82, Issue 4; Other Information: DOI: 10.1103/PhysRevA.82.042705; (c) 2010 The American Physical Society; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

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