Expressions for the matrix element governing the emission of magnetic multipole radiation are given. The effect of weak configuration mixing and the small additional contribution to proton matrix elements (∼5%) arising from the nuclear spin-orbit interaction are considered. For transitions, even in nuclei near closed shells, the theoretical matrix elements derived from pure configurations are too large by a factor of two. The effect of configuration mixing reduces these. Choosing a -function interaction of reasonable strength leads to a reduction of ∼25% in the matrix element for transition in . The transition in is reduced close to the required 50%. The matrix element becomes ∼25% smaller. However, there are no data available for the nucleus , with which one would like to make comparison. Finally, the transition in has its matrix element reduced by only ∼6%. Although the reduction in is somewhat too small, one cannot make a positive statement that configuration mixing is incapable of explaining the experimental result since a two-body force of a more realistic type may close the gap between theory and experiment. However, for there seems no doubt that other effects, for example, meson currents, must be incorporated.
- Received 12 November 1958
- Published in the issue dated April 1959
© 1959 The American Physical Society