Newson, Donovan;
Kadokura, Rina;
Allen, Harriet;
Fayer, Samuel;
Brawley, Simon;
Shipman, Michael;
Laricchia, Gaetana;
... Sarkadi, Laszlo; + view all
(2023)
Low-Energy Positronium Scattering from O2.
Physical Review A: Atomic, Molecular and Optical Physics
, 107
, Article 022809. 10.1103/PhysRevA.107.022809.
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Abstract
The total cross-section of positronium scattering from molecular oxygen has been measured in the velocity range 0.27 − 1.50 a.u. (energy range 2 − 61 eV) and found to be close to the corresponding equivelocity electron cross-section above 0.87 a.u. (20 eV), as previously found by Brawley et al. Science 330 789 (2010). However, below this value the cross-section for positronium is observed to exceed that for electrons by up to a factor of 4 at the lowest energy. Measurements are compared to the predictions of low-energy resonant peaks in the elastic scattering cross-section calculated within a free-electron-gas model refined by applying corrections to the correlation energy for the interaction between Ps and the electron gas. Additionally, cross-sections for O− 2 formation and positronium break-up have been calculated using a classical trajectory Monte Carlo approach. Comparisons are made with earlier calculations and discussed in terms of both experimental and theoretical uncertainties.
| Type: | Article |
|---|---|
| Title: | Low-Energy Positronium Scattering from O2 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevA.107.022809 |
| Publisher version: | https://journals.aps.org/pra/abstract/10.1103/Phys... |
| Language: | English |
| Additional information: | Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10164844 |
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