Spin polarization effects on magnetic dipole moment of 153,155Eu

Using the Quasiparticle Phonon Nuclear Model (QPNM) and taking into account the spin-spin interaction the effects of the spin polarization on the intrinsic magnetic moments (g K ) of 153-155Eu isotopes have been studied. Our calculations indicated that because of the spin polarization, the spin gyromagnetic factors (g s ) of the nucleons in the nucleus reduce noticeable from its free nucleon value and the spin-spin interactions play an important role in the renormalization ( g s e f f . ) of the g s factors. A very good reproduction of the phenomenological quenching of g s factor from its free values ( g s e f f ≅ 0.6 − 0.7 g s f r e e ) is obtained. The calculated values of effective g s e f f and g K are also in fair agreementwith the experiment data.