Inhibition ofM1γTransitions withΔT=0in Self-Conjugate Nuclei

It is shown that the strengths of $M1\mathrm{}$ $\gamma$ transitions with no change of isotopic spin in self-conjugate nuclei may be expected to be smaller by a factor 100 than the normal $M1\mathrm{}$ strengths; the reason is that the matrix element for the particular $M1\mathrm{}$ transitions mentioned above is considerably reduced owing to an almost complete cancellation of the protonic, neutronic, and orbital magnetic moments.