Investigation of High-Spin Rotational States in the Atomic Nucleus.

The ground state rotational bands of some rare earth nuclei show a rather
strange behaviour at large values of angular momenta. The nuclear moment of
inertia TETA increases smoothly with angular momentum I UP to I=12. Then at
about I=14 there is a sudden increase in the moment of inertia. The plot of
TETA versus the square of the angular velocity W gives a S-shaped curve.
We attempt here to reproduce such behaviour within the framework of the
self-consistent cranking model, with inclusion of approximate projection of
particle number. We study the energy spectra of the groundstate rotational
bands of some nuclei with theaim of investigating this strange behaviour in
these nuclei. It seems that Coriolis-antipairing effect which stress the importance
of the compitition between the pairing effect and Coriolis forces,
can interpret the appearance of this behaviour in the groundstate rotational
bands of the nuclei.