Abstract
We investigate the problem of whether rotation-alignment of nucleons in high- j orbits, which causes the first backbend of even nuclei in the light rare-earth region, manifests itself or is blocked in the adjacent odd- A nuclei when the last odd like nucleon is present in the same j-orbits. The problem is formulated in an extended particle-rotor model where pairing correlation is adequately taken into account. The result shows that rotation-alignment of three nucleons in the j-orbits should be observed in the odd- A nuclei. It suggests a relation between the values of spins around which band-crossings take place in neighboring even-even and odd- A nuclei. The relation is found to be consistent with available experimental data.
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