Spin Polarization Effects on Magnetic Dipole Moment of Eu-153,Eu-155

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 Eu153-155 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)(eff.)) of the g(s) factors. A very good reproduction of the phenomenological quenching of g(s) factor from its free values (g(s)(eff) congruent to 0.6-0.7 g(s)(free)) is obtained. The calculated values of effective g(s)(eff.) and g(K) are also in fair agreement with the experiment data.