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{{expert needed|date=August 2016}}
{{technical|date=August 2016}}
A '''Fermi transition''' or a '''Gamow–Teller transition''' are types of [[Beta decay|nuclear beta decay]] determined by changes in angular momentum or spin. In the Fermi transition, the spins of the emitted particles are antiparallel, coupling to <math>S=0</math>, so the angular momentum of the initial and final angular momentum states of the nucleus are unchanged (<math>\Delta J=0</math>). This is in contrast to a Gamow-Teller transition, where the spins of the emitted electron (positron) and antineutrino (neutrino) couple to total spin <math>S=1</math>, leading to an angular momentum change <math>\Delta J = 0,\pm 1</math> between the initial and final angular momentum states of the nucleus.
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