Journal
PHYSICAL REVIEW LETTERS
Volume 106, Issue 17, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.106.173401
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Funding
- National Science Foundation [PHY 0900919]
- U.S. Air Force Research Laboratory
- Direct For Mathematical & Physical Scien [0900919] Funding Source: National Science Foundation
- Division Of Physics [0900919] Funding Source: National Science Foundation
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Zeeman mixing of singlet and triplet 2P states of positronium (Ps) atoms, followed by decay back to the ground state, can effectively turn a long-lived triplet atom into a short-lived singlet state, which would seem to preclude laser cooling of Ps in a magnetic field. Here we report experiments which show that, in fact, because of the large splitting of the n = 2 states in a high magnetic field (the Paschen-Back regime), the amount of such mixing diminishes approximately exponentially with an increasing magnetic field > 0.01 T and is essentially eliminated above similar to 2 T. Thus, laser cooling of Ps should be feasible at high fields, which will facilitate the production of a Ps Bose-Einstein condensate.
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