Abstract
Various measurements and calculations of the vacuum lifetime of ortho-positronium have given widely divergent values. There are indications that these differences are now gradually being resolved.
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Griffith, T., Heyland, G. The mean lifetime of orthopositronium in vacuum. Nature 269, 109–112 (1977). https://doi.org/10.1038/269109a0
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DOI: https://doi.org/10.1038/269109a0
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