Abstract
The particle number- and angular-momentum-constrained HFB equation is solved with the monopole- and quadropole-pairing plus the quadrupole-quadrupole interactions. The numerical results predict that the superdeformed bands become yrast from spin 32ħ in 132Ce, 26ħ in 134Nd and 32ħ in 136Nd. The superdeformed states in 132Ce and 134Nd are characterized by vanishing static pairing gaps, while in 136Nd the neutron pairing gap remains finite even at spin 60ħ. This is due to the neutron spin alignment which is large enough to suppress the dissociation of the other neutron pairs.
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