Bulletin of the American Physical Society
76th Annual Gaseous Electronics Conference
Volume 68, Number 9
Monday–Friday, October 9–13, 2023; Michigan League, Ann Arbor, Michigan
Session GM1: Don Madison Memorial Workshop: Don H. Madison's Impact on the Field
9:00 AM–5:00 PM,
Monday, October 9, 2023
Room: Michigan League, Henderson
Chair: Allison Harris, Illinois State University; Sandra Quintanilla, University of North Texas; Mark Zammit, Los Alamos National Laboratory
Abstract: GM1.00011 : Electronic excitation of atoms by electron and positron impact
3:05 PM–3:40 PM
Presenter:
Josh R Machacek
(Australian National University)
Author:
Josh R Machacek
(Australian National University)
formed into images leading to poor angular resolution in astrophysical observations. This limits our ability to localize and identify sources of positrons from a list of potential
astrophysical processes. Thus, much of our understanding is predicated upon positron transport models. It has recently been shown that excitation processes play an important role
in the number of positrons which survive transport through interstellar media, or the positron survival fraction. We investigate the magnitude of the excitation cross section for both
positrons and electrons and the resulting fluorescence as the atom relaxes to the ground state. Comparisons between available theory and experiment for positron and electron excitation functions will be presented. We will comment on both experimental and theoretical prospects of providing positron and electron excitation functions useful to the astrophysical community.
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