Cool. Positronium 'atoms' are made up of an electron and a positron.
"Researchers are [...] actively seeking tricks to make sources of positronium atoms that live longer. In a paper published today in the journal Physical Review A, the AEgIS collaboration at CERN describes a new way of making long-lived positronium."
@sohkamyung@gregeganSF - I thought the lifetime of positronium was too short for good gravity experiments... people usually use antihydrogen or maybe antineutrons. Okay, the article adresses this. Even in an excited state, a lifetime of only a microsecond! An antineutron lasts about 15 minutes.
@johncarlosbaez@sohkamyung@gregeganSF how is the lifetime of an antineutron shorter than a neutron? Regular neutrons have an average lifeti.e of 14 minutes.
I thought antimatter particles had the same properties?
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