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 Emeritus Sci Advisor PF Gold P: 9,772 Just further to what nrqed said a couple of examples of beta decay; Beta+ Decay: $$p \rightarrow n + \upsilon_{e} + e^{+}$$ Beta- Decay; $$n \rightarrow p + \overline{\upsilon_{e}} + e^{-}$$ I was going to draw Feynman diagrams but then I realised PF doesn't support them in latex