Tag Archives: pions

Move over plain helium, Pionic helium is here

pion

A helium atom in which one of the two electrons has been replaced by a negative pion gives out a composite particle made of one quark and one antiquark. Exotic atoms can help physicists to make exquisitely precise measurements of the fundamental constants of nature, such as the size of the proton. Pionic helium is the latest addition to a ...

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