Many-Body Effects Observed in the Positron Annihilation Experiment

• Authors: G. Kontrym-Sznajd , H. Sormann
• Languages of publication: EN

Abstracts

EN

This paper is devoted to study many-body effects in the positron annihilation experiment, both electron-positron (e-p) and electron-electron (e-e) correlations. Various theories of the e-p interaction in real solids were used to verify them by comparing theoretical and experimental e-p momentum densities in Cu and Y. We show that the lattice potential has an essential influence on the e-p correlation effects, i.e. their proper description must be done via periodic lattice potential as e.g. in the Bloch modified ladder theory. Moreover, it is not true that the dynamic parts of the direct e-p and e-e interactions cancel each other because e-e correlations are observed not only in the Compton scattering but also in the positron annihilation experiments.

Keywords

EN

78.70.Bj; 78.70.Ck; 74.25.Jb

Discipline

• 78.70.Bj: Positron annihilation(for positron states, see 71.60.+z in electronic structure of bulk materials; for positronium chemistry, see 82.30.Gg in physical chemistry and chemical physics)
• 78.70.Ck: X-ray scattering
• 74.25.Jb: Electronic structure (photoemission, etc.)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2005
• Volume: 107
• Issue: 4
• Pages: 562-569

Dates

published

2005-04

received

2004-09-20

Contributors

author

G. Kontrym-Sznajd

• Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 937, 50-950 Wrocław 2, Poland

author

H. Sormann

• Institut für Theoretische Physik - Computational Physics, Technische Universität Graz, Petersgasse 16, 8010 Graz, Austria

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Identifiers

DOI

10.12693/APhysPolA.107.562