A measurement of positronium’s energy levels confounds scientists

A new measurement of the exotic “atom” — consisting of an electron and its antiparticle, a positron — disagrees with theoretical calculations, scientists report in the Aug. 14 Physical Review Letters. And physicists are at a loss to explain it. A flaw in either the calculations or the experiment seems unlikely, researchers say. Saiba mais...

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Imagem: T. Tibbitts