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Effect of positron-alkali metal atom interactions in the diffuse interstellar medium

Panther, Fiona Helen; Seitenzahl, Ivo R.; Crocker, Roland; Machacek, Joshua; Murtagh, Daniel; Siegert, Thomas; Diehl, R.


In the Milky Way galaxy, positrons, which are responsible for the diffuse 511 keV gamma ray emission observed by space-based gamma ray observatories, are thought to annihilate predominantly through charge exchange interactions with neutral hydrogen. These charge exchange interactions can only take place if positrons have energies greater than 6.8 eV, the minimum energy required to liberate the electron bound to the hydrogen atom and then form positronium, a short-lived bound state composed of a...[Show more]

CollectionsANU Research Publications
Date published: 2018
Type: Journal article
Source: Physical Review D
DOI: 10.1103/PhysRevD.98.023015
Access Rights: Open Access


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