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Unusual nature of positronium-proton elastic scattering

Mitroy, J., Ratnavelu, K. and Stelbovics, A. (1996) Unusual nature of positronium-proton elastic scattering. Physical Review A - Atomic, Molecular, and Optical Physics, 54 (2). pp. 1720-1722.

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The Lippmann-Schwinger equation for positronium-proton elastic scattering lacks a first-order term because the center of mass and center of charge are coincident. A consequence of this is that the high-energy behavior of the phase shift is governed by the second-Born approximation. Asymptotic analysis indicates that the high-energy form of the phase shift is δL∼O(1/k3), where k is the incident positronium momentum. The asymptotic analysis has been confirmed by an explicit close-coupling calculation including the Ps(1s), Ps(2s), Ps(2p), H(1s), H(2s), and H(2p) states.

Publication Type: Journal Article
Murdoch Affiliation: Centre for Atomic, Molecular and Surface Physics
School of Mathematical and Physical Sciences
Publisher: The American Physical Society
Copyright: © 1996 The American Physical Society
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