Positron-Annihilation Momentum Profiles in Aluminum: Core Contribution and the Independent-Particle Model

K. G. Lynn; J. R. MacDonald; R. A. Boie; L. C. Feldman; J. D. Gabbe; M. F. Robbins; E. Bonderup; J. Golovchenko

doi:10.1103/PhysRevLett.38.241

Positron-Annihilation Momentum Profiles in Aluminum: Core Contribution and the Independent-Particle Model

K. G. Lynn, J. R. MacDonald, R. A. Boie, L. C. Feldman, J. D. Gabbe, M. F. Robbins, E. Bonderup, and J. Golovchenko

Phys. Rev. Lett. 38, 241 – Published 31 January 1977

Abstract

The momentum profiles from positron annihilation with core electrons in Al have been observed with a recently developed two-detector Doppler-broadening technique. Independent-particle-model (IPM) calculations are in good agreement with the experimental results beyond twice the Fermi momentum and suggest the absence of strong positron-electron correlation effects in this region. Comparisons of calculations with properly normalized momentum profiles indicate that high-momentum core contributions may provide information on the nature of vacancy-type defects and self-trapping effects.

Received 17 August 1976

DOI:https://doi.org/10.1103/PhysRevLett.38.241

Authors & Affiliations

K. G. Lynn^*,†

Brookhaven National Laboratory, Upton, New York 11973

J. R. MacDonald^‡, R. A. Boie, L. C. Feldman, J. D. Gabbe, and M. F. Robbins

Bell Laboratories, Murray Hill, New Jersey 07974

E. Bonderup and J. Golovchenko

Institute of Physics, University of Aarhus, 8000 Aarhus C, Denmark

^*Resident visitor at Bell Laboratories, Murray Hill, N. J. 07974.
^†Work partly supported by the U. S. Energy Research and Development Administration.
^‡Present address: Department of Physics, University of Guelph, Guelph, Ont., Canada.