Measurements of ositronium formation cross sections for positrons scattered by K atoms

Journal Article · Sat May 01 04:00:00 EDT 1993 · Bulletin of the American Physical Society

OSTI ID:281243

Kwan, C K; Zhou, S; Jiang, L ^[1]

---

1. and others

We have measured positronium formation cross sections, Q{sub Ps}, for 1 to 100 eV positrons scattered by K atoms. Our experimental approach involves setting lower and upper limits on Q{sub Ps} using (1) the detection of the coincidences of 511 keV annihilation gamma rays produced by the decay of para-Ps and (2) measurement of the transmission of the positron beam through the K vapor in our scattering cell with the angular discrimination of our apparatus deliberately made as poor as possible. Our present Q{sub Ps} results between 1 and 10 eV are substantially higher than those predicted by Guha and Mandal using destorted wave approximation calculation, and suggest, along with our recent total scattering cross section measurements, that cross-channel coupling effects between the Ps formation channel and other scattering channels may be playing an important role in positron-K scattering as has been shown to be the case for positron-Li scattering.

• OSTI ID: 281243
• Report Number(s): CONF-9305421--; CNN: Grant PHY90-21044
• Journal Information: Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 3 Vol. 38; ISSN BAPSA6; ISSN 0003-0503
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CROSS SECTIONS
POSITRON-ATOM COLLISIONS
POSITRONIUM
POTASSIUM
SCATTERING