Second Backbend in the Mass A ~ 180 Region
A. Ansari
Abstract
Within the framework of selfconsistent cranked Hartree-Fock- Bogoliubov theory(one-dimensional) we predict second backbend in the yrast line of Os-182 at I ≈ 40 , which is even sharper than the first one observed experimentally at I ≈ 14 . Around such a high spin the structure becomes multi-quasiparticle type, but the main source of this strong discontinuity is a sudden large alignment of i13/2 proton orbitals along the rotation axis followed soon by the alignment of j15/2 neutron orbitals. This leads to drastic structural changes at such high spins. When experimentally confirmed, this will be observed for the first time in this mass region, and will be at the highest spin so far.
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