Large numbers of cold positronium atoms created in laser-selected Rydberg states using resonant charge exchange

R. McConnell, G. Gabrielse, W. S. Kolthammer, P. Richerme, A. Müllers, J. Walz, D. Grzonka, M. Zielinski, D. Fitzakerley, M. C. George, E. A. Hessels, C. H. Storry, M. Weel

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12 Scopus citations

Abstract

Lasers are used to control the production of highly excited positronium atoms (Ps∗). The laser light excites Cs atoms to Rydberg states that have a large cross section for resonant charge-exchange collisions with cold trapped positrons. For each trial with 30 million trapped positrons, more than 700 000 of the created Ps∗ have trajectories near the axis of the apparatus, and are detected using Stark ionization. This number of Ps∗ is 500 times higher than realized in an earlier proof-of-principle demonstration (2004 Phys. Lett. B 597 257). A second charge exchange of these near-axis Ps∗ with trapped antiprotons could be used to produce cold antihydrogen, and this antihydrogen production is expected to be increased by a similar factor.

Original languageEnglish (US)
Article number064002
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Volume49
Issue number6
DOIs
StatePublished - Feb 23 2016

Keywords

  • Rydberg states
  • charge-exchange
  • positronium
  • positrons

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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