Differential positronium-formation cross sections for Ne, Ar, Kr, and Xe

S. E. Fayer, D. M. Newson, S. J. Brawley, A. Loreti, R. Kadokura, T. J. Babij, J. Lis, M. Shipman, and G. Laricchia

Phys. Rev. A 100, 062709 – Published 19 December 2019

Abstract

Experimental determinations of the absolute differential positronium-formation cross sections near $0^{\circ}$ for Ne, Ar, Kr, and Xe are presented and compared with theory. The degree of forward collimation, expressed by the ratios of the differential-to-integral positronium-formation cross sections, is also computed and compared with theories and other targets. Trends among targets and structures at low energies emerge when considered as a function of the reduced total energy.

Received 20 September 2019

DOI:https://doi.org/10.1103/PhysRevA.100.062709

Physics Subject Headings (PhySH)

Atomic & molecular collisions Electron & positron scattering

Atomic, Molecular & Optical

Authors & Affiliations

S. E. Fayer^1,*, D. M. Newson¹, S. J. Brawley ¹, A. Loreti¹, R. Kadokura¹, T. J. Babij², J. Lis ^1,†, M. Shipman¹, and G. Laricchia ^1,‡

¹UCL Department of Physics and Astronomy, University College London, Gower Street, London, WC1E 6BT, United Kingdom
²Research School of Physics and Engineering, Australian National University, Canberra, ACT 2600, Australia

^*Present address: Center for Fundamental Physics, Northwestern University, Evanston, Illinois 60208, USA.
^†Present address: Department of Physics, University of Colorado, Boulder, Colorado 80309, USA.
^‡g.laricchia@ucl.ac.uk

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Vol. 100, Iss. 6 — December 2019

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