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Hunt AW, Cassidy DB, Sterne PA, et al. Doppler broadening of in-flight positron annihilation radiation due to electron momentum. Phys Rev Lett. 2001;86(24):5612-5doi: 10.1103/PhysRevLett.86.5612.
Hunt, A. W., Cassidy, D. B., Sterne, P. A., Cowan, T. E., Howell, R. H., Lynn, K. G., & Golevchenko, J. A. (2001). Doppler broadening of in-flight positron annihilation radiation due to electron momentum. Physical review letters, 86(24), 5612-5. https://doi.org/10.1103/PhysRevLett.86.5612
Hunt, A W, et al. "Doppler broadening of in-flight positron annihilation radiation due to electron momentum." Physical review letters vol. 86,24 (2001): 5612-5. doi: https://doi.org/10.1103/PhysRevLett.86.5612
Hunt AW, Cassidy DB, Sterne PA, Cowan TE, Howell RH, Lynn KG, Golevchenko JA. Doppler broadening of in-flight positron annihilation radiation due to electron momentum. Phys Rev Lett. 2001 Jun 11;86(24):5612-5. doi: 10.1103/PhysRevLett.86.5612. PMID: 11415314.
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Phys Rev Lett. 2001 Jun 11;86(24):5612-5. doi: 10.1103/PhysRevLett.86.5612.

Doppler broadening of in-flight positron annihilation radiation due to electron momentum.

Physical review letters

A W Hunt, D B Cassidy, P A Sterne, T E Cowan, R H Howell, K G Lynn, J A Golevchenko

Affiliations

  1. Center for Materials Research, Washington State University, Pullman, Washington 99164-2711, USA.

PMID: 11415314 DOI: 10.1103/PhysRevLett.86.5612

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 2.5 MeV 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.

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