An experimental and theoretical study of the momentum distribution of two photon annihilating positron–electron pairs in methane
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The momentum distributions of annihilating positron–electron pairs have been measured in liquid and solid methane. Calculated momentum distributions generally assume that the positron wave function ψ+ = 1. This low-momentum, plane-wave representation of the positron is inadequate to describe the experimental distribution for high momenta. A ψ+ obtained by numerical integration of the ground-state radial Schrödinger equation is employed in the calculation and a good fit is observed with experiment for all momentum values.
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2001 ◽
Vol 86
(11)
◽
pp. 2257-2260
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