Positron-electron pairs emitted from metallic and oxide surfaces

I. S. Brandt, Z. Wei, F. O. Schumann, and J. Kirschner
Phys. Rev. B 92, 155106 – Published 6 October 2015

Abstract

If a positron impacts onto a surface, it may lead to the emission of a positron-electron pair. We have commissioned a laboratory-based positron source and performed a systematic study on a variety of solid surfaces. In a symmetric emission geometry we can explore the fact that positrons and electrons are distinguishable particles. Following fundamental symmetry arguments we have to expect that the available energy is shared unequally among positrons and electrons. Experimentally we observe such a behavior for all materials studied. We find a universal feature for all materials in the sense that, on average, the positron carries a larger fraction of the available energy. A scattering model accounts qualitatively for the observed energy sharing in positron-electron pair emission. A comparison of the intensity levels from the different materials reveals a monotonic relation between the singles and pair coincidence count rates.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
3 More
  • Received 24 March 2015
  • Revised 4 August 2015

DOI:https://doi.org/10.1103/PhysRevB.92.155106

©2015 American Physical Society

Authors & Affiliations

I. S. Brandt1, Z. Wei1, F. O. Schumann1,*, and J. Kirschner1,2

  • 1Max Planck Institut für Mikrostrukturphysik, Weinberg 2, 06120 Halle, Germany
  • 2Institut für Physik, Martin-Luther Universität, 06120 Halle, Germany

  • *schumann@mpi-halle.de

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 92, Iss. 15 — 15 October 2015

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×