Positron Annihilation with Inner-Shell Electrons in Noble Gas Atoms

Koji Iwata, G. F. Gribakin, R. G. Greaves, and C. M. Surko
Phys. Rev. Lett. 79, 39 – Published 7 July 1997
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Abstract

Measurements are presented of the Doppler broadening of the 511-keV γ-ray line from thermalized positrons annihilating with Ar, Kr, and Xe. The experiments are conducted at low pressures using positrons stored in a Penning-Malmberg trap, which ensures that only two-body interactions are involved. The contributions from annihilation on inner-shell electrons are studied quantitatively in an isolated atomic system for the first time. The spectra are compared with theoretical calculations using a simple Hartree-Fock model to identify the inner-shell contributions.

  • Received 12 February 1997

DOI:https://doi.org/10.1103/PhysRevLett.79.39

©1997 American Physical Society

Authors & Affiliations

Koji Iwata1, G. F. Gribakin2, R. G. Greaves1, and C. M. Surko1

  • 1Physics Department, University of California, San Diego, La Jolla, California 92093-0319
  • 2School of Physics, University of New South Wales, Sydney 2052, Australia

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Vol. 79, Iss. 1 — 7 July 1997

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