Investigation of low-lying magnetic dipole excitations in the 153 Eu nucleus

Abstract

The properties of low-lying magnetic dipole ( M 1) excitations in 153 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 152 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.