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Dear Fruchart
It is Gamow and Teller GT Matrix element. Considering the selection rule Dl = 1 or 0 but no 0----0
Dear Issam, what do you mean by GT??? (matrix element??)
GT ???
GT means Gamow-Teller transitions. This was introduced to include weak interactions and extend the Fermi theory of beta decay. For simple cases GT=0.
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