Magnetic moments as a probe for rotational alignment

The g-factors of the yrast levels in even-even rare earth and actinide nuclei are interpreted in terms of collective and aligned quasiparticle angular momentum extracted from the experimental spectra. A new decomposition of the total angular momentum into collective and quasiparticle parts is suggested and applied to the calculation of g-factors. The systematic analysis of low-spin levels shows a modulation of the moment of inertia, its derivative with respect to the angular frequency and of the g-factors by the position of the high-spin intruder levels. Our cranking calculations of levels and g-factors in 232Th and 238U reveal certain difficulties of the standard pairing description for considered examples. (orig.)