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It is shown that contribution to the single-quantum annihilation cross section from the 2s1/2 bound electrons cannot be ignored. Calculations of the cross sections have also been made by applying the Biedenharn-Swamy symmetric model, and the region of validity of this model is estimated. Polarization correlations are studied using Dirac-Coulomb wave functions.
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Sheth et al. (1968) studied this question.
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