New precision measurement of the decay rate of singlet positronium

Journal Article · Sun Mar 13 23:00:00 EST 1994 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.72.1632· OSTI ID:5002109

Al-Ramadhan, A H; Gidley, D W ^[1]

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1. Department of Physics, University of Michigan, Ann Arbor, Michigan 48109 (United States)

The singlet decay rate has been measured using magnetic singlet-triplet state mixing for positronium formed in a [ital N][sub 2]-isobutane gas mixture. We find [lambda][sub [ital s]]=7990.9[plus minus]1.7 [mu]s[sup [minus]1]. At 215 ppm this result is 6.5 times more accurate than the previous measurement [D. W. Gidley, A. Rich, E. Sweetman, and D. West], and is the first measurement sensitive enough to test the relative order [alpha][sup 2]ln[alpha] term in the singlet decay rate calculation.

• OSTI ID: 5002109
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 72:11; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

2-METHYLPROPANE
664500* -- Special Atoms & Molecules-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ACCURACY
ALKANES
ALPHA PARTICLES
CHARGED PARTICLES
DATA
DECAY
DISPERSIONS
ELEMENTS
EXPERIMENTAL DATA
FLUIDS
FREQUENCY MIXING
GASES
HYDROCARBONS
INFORMATION
MIXTURES
MULTIPLETS
NITROGEN
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
POSITRONIUM
SENSITIVITY
TRIPLETS