Doppler Broadening of In-Flight Positron Annihilation Radiation due to Electron Momentum

A. W. Hunt, D. B. Cassidy, P. A. Sterne, T. E. Cowan, R. H. Howell, K. G. Lynn, and J. A. Golovchenko
Phys. Rev. Lett. 86, 5612 – Published 11 June 2001; Erratum Phys. Rev. Lett. 87, 139901 (2001)
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Abstract

We report the first observation of electron momentum contributions to the Doppler broadening of radiation produced by in-flight two-photon annihilation in solids. In these experiments an approximately 2.5MeV positron beam impinged on thin polyethylene, aluminum, and gold targets. Since energetic positrons easily penetrate the nuclear Coulomb potential and do not cause a strong charge polarization, the experimental annihilation line shapes agree well with calculations based on a simple independent-particle model. Moreover, annihilations with the deepest core electrons are greatly enhanced.

  • Received 20 March 2001

DOI:https://doi.org/10.1103/PhysRevLett.86.5612

©2001 American Physical Society

Erratum

Erratum: Doppler Broadening of In-Flight Positron Annihilation Radiation due to Electron Momentum [Phys. Rev. Lett. 86, 5612 (2001)]

A. W. Hunt, D. B. Cassidy, P. A. Sterne, T. E. Cowan, R. H. Howell, K. G. Lynn, and J. A. Golovchenko
Phys. Rev. Lett. 87, 139901 (2001)

Authors & Affiliations

A. W. Hunt1, D. B. Cassidy2,*, P. A. Sterne3, T. E. Cowan3,†, R. H. Howell3, K. G. Lynn1,4, and J. A. Golovchenko2

  • 1Center for Materials Research, Washington State University, Pullman, Washington 99164-2711
  • 2Department of Physics, Harvard University, Cambridge, Massachusetts 02138
  • 3Lawrence Livermore National Laboratory, Livermore, California 94551
  • 4Department of Physics, Washington State University, Pullman, Washington 99164-2814

  • *Present address: Department of Physics, Washington State University, Pullman, WA 99164-2814.
  • Present address: Photonics Division, General Atomics, San Diego, CA 92121-1122.

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Vol. 86, Iss. 24 — 11 June 2001

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