Energy-dependent Ps-He momentum-transfer cross section at low energies

J. J. Engbrecht, M. J. Erickson, C. P. Johnson, A. J. Kolan, A. E. Legard, S. P. Lund, M. J. Nyflot, J. D. Paulsen

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17 Scopus citations

Abstract

Positronium (Ps)-He scattering presents one of the few opportunities for both theory and experiment to tackle the fundamental interactions of Ps with ordinary matter. Below the dissociation energy of 6.8 eV, experimental and theoretical work has struggled to find agreement on the strength of this interaction as measured by the momentum-transfer cross section (Ïm). Here, we present work utilizing the Doppler broadening technique with an age-momentum correlation apparatus. This work demonstrates a strong energy dependence for this cross section at energies below 1 eV and is consistent with previous experimental results.

Original languageEnglish (US)
Article number012711
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume77
Issue number1
DOIs
StatePublished - Jan 17 2008

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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    Engbrecht, J. J., Erickson, M. J., Johnson, C. P., Kolan, A. J., Legard, A. E., Lund, S. P., Nyflot, M. J., & Paulsen, J. D. (2008). Energy-dependent Ps-He momentum-transfer cross section at low energies. Physical Review A - Atomic, Molecular, and Optical Physics, 77(1), [012711]. https://doi.org/10.1103/PhysRevA.77.012711