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The properties of low-lying magnetic dipole (M 1) excitations in Eu were studied within a rotational invariant quasiparticle phonon model that takes into account the symmetry-restoring as well as spin–spin residual forces. The calculations show that there are purely collective M 1 excitations lying at 2–4 MeV fragmented over orbital 1 states of the Sm core nucleus. The results were compared to the experimentally known M 1 excitations at 2–3 MeV. A reasonably good agreement in the total transition strength, the centroid energy, and the resonance width was obtained.

Investigation of low-lying magnetic dipole excitations in the $^{153}$Eu nucleus