Precision Measurement of Orthopositronium Decay Rate Using SiO2 Powder

نویسندگان

  • O. Jinnouchi
  • S. Asai
  • T. Kobayashi
چکیده

The intrinsic decay rate of orthopositronium formed in SiO2 powder is measured using the direct 2γ correction method such that the time dependence of the pick-off annihilation rate is precisely determined using high energy-resolution germanium detectors. As a systematic test, two different types of SiO2 powder are used with consistent findings. The intrinsic decay rate of orthopositronium is found to be 7.0396 ± 0.0012(stat.) ± 0.0011(sys.)μs, which is consistent with previous measurements using SiO2 powder with about twice the accuracy. Results agree well with a recent O(α) QED prediction, varying 3.8− 5.6 experimental standard deviations from other measurements.

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تاریخ انتشار 2003