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Title:
Direct positron annihilation and positronium formation in thermal plasmas
Authors:
Gould, Robert J.
Affiliation:
AA(California, University, La Jolla)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 344, Sept. 1, 1989, p. 232-238. (ApJ Homepage)
Publication Date:
09/1989
Category:
Plasma Physics
Origin:
STI
NASA/STI Keywords:
Computational Astrophysics, Gamma Ray Astronomy, Positron Annihilation, Thermal Plasmas, Born Approximation, Perturbation Theory, Photodissociation, Power Series, Recombination Reactions
DOI:
10.1086/167792
Bibliographic Code:
1989ApJ...344..232G

Abstract

In the present evaluation of the rate of direct positron annihilation with electrons in the nonrelativistic limit, general analytic expressions are given for the radiative recombination of positrons to form positronium. Formulae are derived for the radiative capture to bound states of atomic hydrogen, and the connection between the two problems is demonstrated. Annihilation from excited states of positronium is considered, and it is estimated that 90 percent of the annihilations occur from the ground 1s state for both ortho and para positronium following radiative capture and cascade. A convenient form is given for the photodissociation cross section of positronium.

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