| 11. | Positronium has been studied since the 1950s to understand bound states in quantum field theory.
|
| 12. | The properties of positronium were predicted by Carl D . Anderson of Caltech in 1932.
|
| 13. | Electrons and positrons drifting through space will encounter one another and occasionally form positronium atoms.
|
| 14. | Positronium is the bound state of an electron and a positron and therefore the lightest atom.
|
| 15. | The decay rate of the singlet ( " para-positronium " ) 1 S 0 state yields
|
| 16. | The energy of the photons from positronium should differ slightly by the binding energy of the molecule.
|
| 17. | Thus, for positronium, its reduced mass only differs from the electron by a factor of 2.
|
| 18. | Positronium decays through the annihilation of the electron and the positron into two or more gamma-ray photons.
|
| 19. | For example Positronium is quite stable ( for some nanoseconds, but that is long in this case ).
|
| 20. | For insulators such as polymers or zeolites, implanted positrons interact with electrons in the material to form positronium.
|
