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- W2079521432 abstract "Conservation of angular momentum and the isotropy of space prohibit orthopositronium (o-Ps) from annihilating into two photons. Nevertheless, an observed o-Ps decay rate in excess of theory tempts one to speculate on the existence of a ubiquitous field that would couple to Ps, allowing a small partial rate for the long-lived o-Ps state to annihilate into two photons. We apply a 3.4-kG magnetic field to a sample of Ps to quench the m=0 states in the laboratory frame of reference, and search for a 12-h periodicity in the 3ensuremath{gamma} yield. The observed effect is consistent with the assumption that space is isotropic and, at the 80% confidence level, is too small to explain the observed o-Ps decay-rate discrepancy with theory." @default.
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- W2079521432 date "1990-05-28" @default.
- W2079521432 modified "2023-10-18" @default.
- W2079521432 title "Search for spatial anisotropy in orthopositronium annihilation" @default.
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- W2079521432 doi "https://doi.org/10.1103/physrevlett.64.2637" @default.
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