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Hydrogen: Antihydrogen Scattering in the Born-Oppenheimer Approximation
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical and Analytical Chemistry, Quantum Chemistry.
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2004 (English)In: Journal of Physics B: Atomic, Molecular and Optical Physics, ISSN 0953-4075, E-ISSN 1361-6455, Vol. 37, no 6, 1195- p.Article in journal (Refereed) Published
Abstract [en]

We calculate the low-energy scattering between hydrogen and antihydrogen atoms in their ground states using the Born–Oppenheimer approximation. Improved results for rearrangement, direct annihilation and elastic scattering are presented. The elastic cross section agrees well with other calculations. For the rearrangement process we confirm a recent result (Armour E A G and Chamberlain C W 2002 J. Phys. B: At. Mol. Opt. Phys. 35 L489) that rearrangement to the N = 23 state of protonium has a larger cross section than rearrangement to the N = 24 state. For both rearrangement cross sections our results are smaller than those obtained by Armour and Chamberlain. The direct annihilation, and its influence on elastic scattering, is calculated using the scattering length for the strong force between the proton and antiproton. This approach gives strong-force effects qualitatively similar, but smaller than those obtained in another recent work (Voronin A Yu and Carbonell J 2001 Nucl. Phys. A 689 529c).

Place, publisher, year, edition, pages
2004. Vol. 37, no 6, 1195- p.
National Category
Chemical Sciences
URN: urn:nbn:se:uu:diva-72979DOI: 10.1088/0953-4075/37/6/005OAI: oai:DiVA.org:uu-72979DiVA: diva2:100890
Available from: 2007-02-14 Created: 2007-02-14 Last updated: 2011-11-21Bibliographically approved

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