| 21. | The decay of positronium is easily observed by detecting the two 511 keV gamma ray photons emitted in the decay.
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| 22. | A positronium " atom " ( as physicists dub it ) consists of an electron and antielectron, orbiting each other.
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| 23. | The measurement of the splitting between the 2 3 S 1 and the 1 3 S 1 energy levels of positronium yields
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| 24. | The positronium created in such an excited state will quickly cascade down to the ground state, where annihilation will occur more quickly.
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| 25. | The classic onium is positronium, which consists of an electron and a positron bound together as a long-lived metastable state.
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| 26. | Exotic atoms with muons and taus instead of electrons can also be synthesized, as well as lepton antilepton particles such as positronium.
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| 27. | In 1951, Deutsch measured and confirmed the existence of positronium, a bound state of electrons and positrons whirling about each other.
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| 28. | Deutsch was philosophical about his failure to win a Nobel Prize, for which he was nominated in 1956 for his work on positronium.
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| 29. | The neutral pion has also been observed to decay into positronium with a branching fraction of the order of 10 & minus; 9.
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| 30. | Mohorovi i is often called " the father of positronium " because his most significant work is the prediction of the existence of positronium.
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