Nuclear Shell Models

The principal features of the several shell models now under discussions are described briefly.The magnetic moments of odd nuclei have been interpreted as (a) supporting an extreme single particle model (Schmidt limits) and (b) as generally consistent with a uniform model (Margenau-Wigner limits). The evidence is consistent with a composite interpretation based on (a) the approximate validity of the extreme single particle model for nuclei lacking one particle to make a closed shell or possessing one particle in excess of the number making up a closed shell, and (b) the approximate validity of the uniform model for all other odd nuclei.Remarks on quadrupole moments, isomerism and beta-decay supplement an earlier discussion.