Positronium in a-Quartz. I. Observed Temperature Dependence of the Positronium Effective Mass and tha Probability of Annihilation from Singlet Positronium State
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概要
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The momentum distribution of photon pairs from positrons annihilating insynthetic crystalline quartz has been measured over a wide temperature ra?ge.The width of the narrow component in the distribution was analyzed to yieldthe positronium effective mass. The effective mass is found to be (1.6,g0.l5)X2m. at low temperature, but appears to increase as the temperature is raised.This result will be discussed in Part II from the view-point of positronium-phononinteraction.The probability of annihilation from singlet positronium state (i.e., the intensityof the narrow component) also increases as the temperature is raised, and tendsto approach to a constant value at sufficiently high temperatures. This rcsultmight be attributable to possible temperature dependence of positronium forma-tion probability in quartz.
- 社団法人日本物理学会の論文
- 1979-01-15
著者
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Fujiwara Kunio
Institute For Solid State Physics University Of Tokyo
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IKARI Hiroshi
Institute of Physics,College of General Education,University of Tokyo
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Ikari Hiroshi
Institute Of Physics College Of General Education University Of Tokyo
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