Phys. Rev. Lett. 36, 1269–1272 (1976)Lifetime Effects of Positronium in PowdersReceived 4 March 1976; published in the issue dated 24 May 1976 A recently reported precision lifetime measurement of orthopositronium in ultrafine SiO2 powders gives a decay rate, extrapolated to zero powder density, which is 2% below the theoretical free-space rate. In this Comment the influence of the powder environment is discussed, including effects of surface bound states, collisional interactions with the powder grains, and Stark shifts of the decay rate. The conclusion is that none of these effects can explain the observed discrepancy in decay rate. © 1976 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.36.1269
DOI:
10.1103/PhysRevLett.36.1269
PACS:
See AlsoOriginal Article: David W. Gidley, Kenneth A. Marko, and Arthur Rich, Precision Measurement of the Decay Rate of Orthopositronium in SiO2 Powders, Phys. Rev. Lett. 36, 395 (1976). |
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