Evidence for absorption effects in positron elastic scattering by argon

Journal Article · Sun Mar 11 23:00:00 EST 1990 · Physical Review Letters; (USA)

DOI:https://doi.org/10.1103/PhysRevLett.64.1227· OSTI ID:7188504

Smith, S J; Hyder, G M.A.; Kauppila, W E; Kwan, C K; Stein, T S ^[1]

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1. Department of Physics and Astronomy, Wayne State University, Detroit, Michigan 48202 (USA)

Relative differential cross sections for elastic scattering of 5--50-eV positrons by argon atoms at angles from 30{degree} to 134{degree} are measured in a crossed-beam experiment. These measurements provide strong evidence that the positronium formation channel (threshold=9.0 eV) is having a significant absorption'' effect on the elastic-scattering channel, as is observed by the washing out'' of clear structure (a maximum and minimum) present in the measured elastic differential cross section below 9.0 eV (where good agreement is found with theory) when the positron energy is increased to higher energies.

• OSTI ID: 7188504
• Journal Information: Physical Review Letters; (USA), Journal Name: Physical Review Letters; (USA) Vol. 64:11; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION
ARGON
ATOM COLLISIONS
COLLISIONS
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
ELASTIC SCATTERING
ELEMENTS
ENERGY
ENERGY ABSORPTION
ENERGY RANGE
EV RANGE
EV RANGE 01-10
EV RANGE 10-100
FLUIDS
GASES
INCIDENCE ANGLE
NONMETALS
POSITRON COLLISIONS
POSITRON-ATOM COLLISIONS
POSITRONIUM
RARE GASES
SCATTERING
THRESHOLD ENERGY