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Abstract

Recently, the magnetic and electric radiative decay rates of the 7.8 eV Th-229m isomer have been predicted within a model of nuclear collective quadrupole-octupole (QO) and single particle (s.p.) motions with the Coriolis interaction. As a next step, in the study we examine the magnetic dipole moment (MDM) in the K = 5/2(+) ground and K = 3/2(+) isomeric states based on the parity-projected s.p. wave functions obtained for the odd neutron in both states without consideration of the Coriolis mixing effects. The comparison with experimental data shows that the description of MDMs may impose additional constraint on the model parameters providing further tuning of the predicted isomer-decay rates in favour of the efforts for establishing of a "nuclear clock" frequency standard.