How can an electron be ejected from a nucleus during a Beta
Wave decay? Apparently a neutron decays into a protron, electron (
which is ejected) and a neutrino. Electrons are leptons and neutrons
are made of quarks...how can an electron split off another
The electron and neutrino are a lepton, anti-lepton pair.
This pair is emitted by a down-quark as it transforms itself into
an up-quark. (Actually, the down-quark emits a W-particle which
"decays" into the lepton, anti-lepton pair, but that is not essential
to the fact that lepton number is conserved).
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Update: June 2012