| 1. | His studies of radioactive decay led him to the discovery of positronium.
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| 2. | Measurements of ? can also be extracted from the positronium decay rate.
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| 3. | Positronium in the 2S state is metastable having a lifetime of against annihilation.
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| 4. | He was searching for spectra of positronium in the sky, but unsuccessfully.
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| 5. | Positronium is an " atom " consisting of an electron and a positron.
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| 6. | Maybe you should try the somewhat longer-lived muonium instead of positronium.
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| 7. | The positronium helide ion PsHe + should be formed when positrons encounter helium.
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| 8. | Positronium is a hydrogenlike atom without a nucleus.
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| 9. | Smith is looking to store positrons in a quasi-stable form called positronium.
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| 10. | It was experimentally discovered in 1951 by Martin Deutsch and became known as positronium.
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