The Fermi decay mode, characterized by ∆S=0 and ∆J=0, is the exclusive decay mechanism for transitions where both the initial and final states possess zero angular momentum and identical parities. This decay mode is particularly relevant in scenarios involving vanishing momentum transfer, while other decay modes become negligible in beta decay under these conditions. Isospin conservation plays a crucial role in all particle reactions, contributing to the understanding of neutrinos and anti-neutrinos in beta decays.
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Alec Neeson said:I think that this is a relatively easy question (no equations) however I cannot seem to find anything on it. "For which specific class of decay is only the Fermi decay mode possible?" I know Fermi decay is ∆S=0 and therefore ∆J=0 type of decay