FORMATION AND QUENCHING OF POSITRONIUM IN GASES. 1. RESULTS OBTAINED WITH THE THREE-PHOTON COINCIDENCE METHOD
The three-photon coincidence method is used to study ortho-positronium formation and quenching in argon, nitrogen, oxygen, and mixtures of these gases. Quenching rates are found to be proportional to pressure for all gases and gas mixtures except commercial grade argon. Oxygen argon mixtures showed a 20% increase in positronium formation for oxygen concentration of the order of 10 parts per million. An increase of about 50% in the formation fraction is obtained for nitrogen--argon mixtures, for nitrogen concentrations of about 10%. A uniform quenching rate is found for oxygen--argon mixtures containing up to 0.1% oxygen, and for nitrogen -- argon mixtures containing up to 10% nitrogen. (auth)
- Research Organization:
- New South Wales, Australia. Univ., Kensington
- NSA Number:
- NSA-18-004398
- OSTI ID:
- 4124370
- Report Number(s):
- NP-13329
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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MEASUREMENTS OF QUENCHING OF ORTHOPOSITRONIUM IN GASES
Three-photon annihilation of ortho-positronium in argon gas