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 (gK) of 153-155Eu isotopes have been studied. Our calculations indicated that because of the spin polarization, the spin gyromagnetic factors (gs) 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 (gseff.) of the gs factors. A very good reproduction of the phenomenological quenching of gs factor from its free values (gseff≅0.6−0.7gsfree) is obtained. The calculated values of effective gseff and gK are also in fair agreementwith the experiment data.