Speaker
Prof.
Shan-Gui Zhou
(ITP/CAS, Beijing, China)
Description
The recently observed high-spin rotational bands in odd-$A$
nuclei $^{247,249}$Cm and $^{249}$Cf [Tandel et al.,
Phys. Rev. C 82 (2010) 041301] are investigated by using the
cranked shell model (CSM) with the pairing correlations treated
by a particle-number conserving (PNC) method in which the
blocking effects are taken into account exactly. The
experimental moments of inertia and alignments and their
variations with the rotational frequency $\omega$ are
reproduced very well by the PNC-CSM calculations. By examining
the $\omega$-dependence of the occupation probability of each
cranked Nilsson orbital near the Fermi surface and the
contributions of valence orbitals to the angular momentum
alignment in each major shell, the level crossing and
upbending mechanism in each nucleus is understood clearly.
