Abstract
The Hartree-Fock-Bogolyubov cranking method is applied to analyze the double backbending effect recently observed in 160Yb. The model Hamiltonian used contains the deformed Woods-Saxon potential and monopole pairing terms. The deformation is parametrized in terms of quadrupole and hexadecapole degrees of freedom. The particular values of the deformation employed are calculated by making use of the Strutinsky method. Calculations are performed selfconsistently using a fast convergent iteration procedure. The parameters of the Woods-Saxon and pairing potentials are taken from independent investigations and are not adjusted here. The backbending effects occurring at I = 10–14 h ̵ and I = 26–28 h ̵ are reproduced without any free parameter and are associated to the gapless superconductivity (particle alignment) taking place for neutrons and protons, respectively. The corresponding microscopic structure rearrangements of the rotational states are illustrated and discussed.
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