2003/08/10 by O. Jinnouchi, S. Asai, T. Kobayashi · 3 citations
Chemistry · Engineering · Mathematics · Physics and Astronomy · #Analytical Chemistry (journal) #Annihilation #Atomic and Molecular Physics #Chemistry #Chromatography #Computational physics #Detector #Energy (signal processing) #Materials science #Mathematics #Muon and positron interactions and applications #Nuclear physics #Optics #Physics #Quantum mechanics #Radiation Detection and Scintillator Technologies #Statistics #Systematic error #hep-ex
paper · pdf · doi:10.1016/j.physletb.2003.08.018
published as Phys.Lett. B572 (2003) 117-126 · 16 pages, 7 figures included. To be published in Physics Letters B
arxiv created 2003/08/10 · openalex publication_date 2003/10/01 · arxiv updated 2015/06/25 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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−1, which is consistent with previous measurements using SiO2 powder with about twice the accuracy. Results agree well with a recent O(α2) QED prediction, varying 3.8–5.6 experimental standard deviations from other measurements.