Coupling between positronium formation and elastic positron-scattering channels in the rare gases

Journal Article · Thu Jul 15 04:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.82.012701· OSTI ID:21442916

Jay, P M; Coleman, P G ^[1]

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1. Department of Physics, University of Bath, Bath, BA2 7AY (United Kingdom)

Measurements of elastic-scattering cross sections are presented for positron collisions with helium, neon, argon, krypton, and xenon around the threshold energy for positronium (Ps) formation. The elastic cross section falls slowly with increasing energy above the Ps formation threshold in helium and neon, whereas in argon, krypton, and xenon it exhibits an increase, which appears both more prominent and more sustained as the atomic number of the gas increases. It is proposed that this coupling is a result of an intermediate virtual Ps state that enhances branching into the (atom plus positron) final state.

• OSTI ID: 21442916
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 1 Vol. 82; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
ARGON
BRANCHING RATIO
COLLISIONS
COUPLING
CROSS SECTIONS
DIMENSIONLESS NUMBERS
ELASTIC SCATTERING
ELEMENTARY PARTICLES
ELEMENTS
ENERGY
FERMIONS
FLUIDS
GASES
HELIUM
KRYPTON
LEPTONS
MATTER
NEON
NONMETALS
POSITRON COLLISIONS
POSITRONIUM
POSITRONS
RARE GASES
SCATTERING
THRESHOLD ENERGY
XENON