Murtagh, DJ;
Cooke, DA;
Laricchia, G;
(2009)
Excited-State Positronium Formation from Helium, Argon, and Xenon.
PHYS REV LETT
, 102
(13)
, Article 133202. 10.1103/PhysRevLett.102.133202.
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Abstract
The cross sections for the formation of positronium in the 2P state in collisions of positrons with He, Ar, and Xe atoms have been determined by measuring coincidences between the remnant ion and the Lyman-alpha photon from positronium. The maximum fractional contributions of these to the total Ps formation cross sections increase from approximately 0.06 +/- 0.01 in He to 0.12 +/- 0.04 in Ar and 0.26 +/- 0.09 in Xe. In the case of He, good agreement is found with a coupled-state calculation; for Ar and Xe, measurements are compared with a distorted-wave Born approximation.
| Type: | Article |
|---|---|
| Title: | Excited-State Positronium Formation from Helium, Argon, and Xenon |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevLett.102.133202 |
| Publisher version: | http://dx.doi.org/10.1103/PhysRevLett.102.133202 |
| Language: | English |
| Additional information: | © 2009 The American Physical Society |
| Keywords: | CROSS-SECTIONS, INTERMEDIATE ENERGIES, IMPACT IONIZATION, NOBLE-GASES, SCATTERING, COLLISIONS, HYDROGEN, ATOMS, AR, HE |
| 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.ucl.ac.uk/id/eprint/130934 |
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