Computer Science
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990nascp3058....1m&link_type=abstract
In NASA, Goddard Space Flight Center, Annihilation in Gases and Galaxies, NASA CP-3058 p 1-11 (SEE N90-18957 11-70)
Computer Science
Alkali Metals, Elastic Scattering, Positrons, Resonance Scattering, Scattering Cross Sections, Atomic Energy Levels, Atomic Excitations, Born Approximation, Coupling Coefficients, Glauber Theory
Scientific paper
Positron-alkali atom scattering was recently investigated both theoretically and experimentally in the energy range from a few eV up to 100 eV. On the theoretical side calculations of the integrated elastic and excitation cross sections as well as total cross sections for Li, Na and K were based upon either the close-coupling method or the modified Glauber approximation. These theoretical results are in good agreement with experimental measurements of the total cross section for both Na and K. Resonance structures were also found in the L = 0, 1 and 2 partial waves for positron scattering from the alkalis. The structure of these resonances appears to be quite complex and, as expected, they occur in conjunction with the atomic excitation thresholds. Currently both theoretical and experimental work is in progress on positron-Rb scattering in the same energy range.
Horbatsch Michael
McEachran R. P.
Stauffer A. D.
Ward John Strawn
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