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The structure of exotic atoms containing positrons and positronium

Ryzhikh, G. G., Mitroy, Jim and Varga, Kalman (1998). The structure of exotic atoms containing positrons and positronium. Journal of Physics B: Atomic, Molecular and Optical Physics,31(17):3965-3996.

Document type: Journal Article
Citation counts: Scopus Citation Count Cited 121 times in Scopus Article | Citations

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Title The structure of exotic atoms containing positrons and positronium
Author Ryzhikh, G. G.
Mitroy, Jim
Varga, Kalman
Journal Name Journal of Physics B: Atomic, Molecular and Optical Physics
Publication Date 1998
Volume Number 31
Issue Number 17
ISSN 0953-4075   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-0000061110
Start Page 3965
End Page 3996
Total Pages 32
Place of Publication Bristol, UK
Publisher IOP Publishing
HERDC Category C1 - Journal Article (DEST)
Abstract The structures of a number of exotic atoms with an attached positron or positronium atom are studied using a large-scale variational expansion in terms of a basis of explicitly correlated Gaussian functions. The binding energies and annihilation rates for seven exotic species with electronically stable ground states, namely HPs, Lie+, LiPs, Bee+, Nae+, NaPs and Mge+ have been predicted. The binding energy for HPs, 0.038 1944 Hartree, is the largest attained so far. Two of the species, Lie+ and Nae+, with approximate binding energies of 0.0024 and 0.0005 Hartree respectively, are seen to have structures best described as a positronium atom orbiting a residual Li+ or Na+ positively charged core. The Bee+ atom with an approximate binding energy of 0.0028 Hartree is best characterized as a positron orbiting a polarized Be core. The binding energy of the Mge+ ground state, 0.014 Hartree, is larger than that of any other positronic atom (a neutral atom with an attached positron). The LiPs and NaPs atoms, with approximate binding energies of 0.012 and 0.0072 Hartree respectively, have structures similar to HPs although the binding energies are smaller and the valence electrons and the positron are found at larger distances from the nucleus.
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Created: Fri, 12 Sep 2008, 08:35:25 CST by Administrator