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The rotation alignment in the actinide region

Rotational properties of actinide nuclei are studied in the cranked Hartree-Fock-Bogoliubov model with pairing and quadrupole interactions. General conditions for the backbending anomaly are studied as a function of charge, Z, and neutron number, N, with the aim of comparing the rotation alignment in the rare-earth and actinide regions. It is found that the smooth increase of the moment of inertia with increasing angular momentum is due to a gradual alignment of both the i13/2 proton pair and the j15/2 neutron pair. At Z approximately 92 the critical rotational frequency is smaller for pi i13/2 than for nu j15/2 and therefore the behaviour of the proton pair i13/2 at high spins seems to be decisive for the appearance of the backbending anomaly in this mass region. It is found that the core moment of inertia depends strongly on the rotational frequency and largely determines the slope of the J( omega 2) curve.