For the (positron) emission from a nucleus, there is another competing process known as electr capture...

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For the (positron) emission from a nucleus, there is another competing process known as electr capture (electron from an inner orbit, say, the K-shell, is captured by the nucleus and a neutrino is emitted). Y+v Show that if emission is energetically allowed, electron capture is necessarily allowed but not vice-versa. For the (positron) emission from a nucleus, there is another competing process known as electr capture (electron from an inner orbit, say, the K-shell, is captured by the nucleus and a neutrino is emitted). Y+v Show that if emission is energetically allowed, electron capture is necessarily allowed but not vice-versa.

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