Abstract
Isoscalar and isovector components of $M2$ and $M4$ transition matrix elements are obtained by comparing stretched single-(quasi)proton transitions with stretched single-(quasi)neutron transitions. Both the isoscalar and the isovector components are found to be smaller by factors $\frac{{g}^{\mathrm{eff}}}{g}\ensuremath{\simeq}0.2\ensuremath{-}0.3$ than the single-quasiparticle values. The reductions are accounted for, respectively, in terms of destructive effects of the isoscalar magnetic (spin) and the isovector magnetic (isospin-spin) core polarizations.
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