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Determination and applications of enhancement factors for positron and ortho-positronium annihilations

Mitroy, Jim (2005). Determination and applications of enhancement factors for positron and ortho-positronium annihilations. Physical Review A (Atomic, Molecular and Optical Physics),,72(6):62707-1-62707-6.

Document type: Journal Article
Citation counts: Scopus Citation Count Cited 7 times in Scopus Article | Citations

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IRMA ID 80791673xPUB80
Title Determination and applications of enhancement factors for positron and ortho-positronium annihilations
Author Mitroy, Jim
Journal Name Physical Review A (Atomic, Molecular and Optical Physics),
Publication Date 2005
Volume Number 72
Issue Number 6
ISSN 1094-1622   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-33244478082
Start Page 62707-1
End Page 62707-6
Total Pages 6
Place of Publication College Park, Unites States
Publisher American Physical Society
Field of Research 0202 - Atomic, Molecular, Nuclear, Particle and Plasma Physics
0204 - Condensed Matter Physics
0205 - Optical Physics
HERDC Category C1 - Journal Article (DEST)
Abstract Electron-positron annihilation rates calculated directly from the electron and positron densities are known to underestimate the true annihilation rate. A correction factor, known as the enhancement factor, allows for the local increase of the electron density around the positron caused by the attractive electron-positron interaction. Enhancement factors are given for positrons annihilating with the 1s electron in H, He+, He, Li2+, and Li+. The enhancement factor for a free positron annihilating with He+ and He is found to be close to that of orthopositronium (i.e., Ps in its triplet state) annihilating with these atoms. The enhancement factor for Ps-He scattering is used in conjunction with the known annihilation rate for pickoff annihilation to derive a scattering length of 1.47a0 for Ps-He scattering. Further, enhancement factors for e+-Ne and e+-Ar annihilation are used in conjunction with the pickoff annihilation rate to estimate scattering lengths of 1.46a0 for Ps-Ne scattering and 1.75a0 for Ps-Ar scattering.
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