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Positron-helium scattering: Resonance and differential cross sections

✍ Scribed by Puspitapallab Chaudhuri; Sadhan K. Adhikari

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
278 KB
Volume
631
Category
Article
ISSN
0375-9474

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✦ Synopsis

We study positron-helium scattering using close coupling approximation (CCA) employing different combinations of the following basis functions: He(Isis), He(ls2s), He(ls2p), Ps(ls), and Ps(2s), where Ps stands for the positronium atom. We observe a prominent S wave resonance of width 2 eV at about 30 eV, in excitation and rearrangement cross sections to He(ls2s), He(ls2p), Ps(ls) and Ps(2s) states. We also report results of differential cross sections for the excitation of helium and positronium formation.

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Positron scattering by hydrogen atom is an interesting system to test theoretical methods due to its simplicity. Recently, theoretical calculations have reported differential cross sections (DCS) for positronium (Ps) formation for this system. The present work utilises the coupled-channel optical me