Measurements of total and positronium formation cross sections for positron-Mg scattering

Journal Article · Wed May 01 04:00:00 EDT 1996 · Bulletin of the American Physical Society

OSTI ID:394345

Jiang, J; Harte, M; Kauppila, W E; Kwan, C K; Stein, T S; Surdutovich, A; Zhou, S

The authors are measuring total and positronium (Ps) formation cross sections for positron-Mg scattering. Their experimental approach involves using a beam transmission technique to measure the total cross sections and setting lower and upper limits on Ps formation cross sections using a combination of (1) the detection of the coincidences of 511 keV annihilation gamma rays produced by the decay of para-Ps and by the interaction of ortho-Ps with the walls of the scattering cell in which the Ps is formed, and (2) the determination of scattering cross sections associated with the measured transmission of the positron beam through the vapor in their scattering cell with the angular discrimination of their apparatus deliberately made as poor as possible. Comparing with the theoretical results of Gribakin and King, their measured total cross sections differ in shape and their Ps formation lower limits are lower than the theoretical predictions.

• OSTI ID: 394345
• Report Number(s): CONF-9605105--; CNN: Grant PHY94-22271
• Journal Information: Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 3 Vol. 41; ISSN BAPSA6; ISSN 0003-0503
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
MAGNESIUM
PARTICLE PRODUCTION
POSITRON-ATOM COLLISIONS
POSITRONIUM
SCATTERING
TOTAL CROSS SECTIONS