StrongM1Transitions in Light Nuclei

The nature of strong $M1\mathrm{}$ transitions, particularly those observed by inelastic electron scattering at backward angles, is investigated. Calculations of particular cases reveal a tendency to concentrate the transition strength in a few levels, in some respects similar to the familiar giant $E1\mathrm{}$ resonance. The energy-weighted sum rule for such transitions is examined, and an approximation is developed which exhibits the qualitative behavior to be expected in $4N$ nuclei whose ground states have $I=0=T$. The results are compared with experiment.