Phys. Rev. Lett. 102, 133202 (2009) [4 pages]Excited-State Positronium Formation from Helium, Argon, and Xenon
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-α 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. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.133202
DOI:
10.1103/PhysRevLett.102.133202
PACS:
34.80.Uv, 36.10.Dr
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.