Abstract
The backbending in the even-even, /b N/=96 isotones can be quantitatively accounted for by the rotation-alignment of the spins of neutrons in i 13/2 orbits, as shown by comparing the aligned angular momentum and relative Routhian for the /b s/-bands in these isotones and for the i 13/2 bands in the corresponding isotopes with /b N/=97. The influence of protons on this backbending situation is shown to be indirect, acting through a change of the nuclear deformation which yields a change of the moment of inertia of the g.s. band and of the non-rigid character of the rotation. The experimental data on the /b N /=96 and 97 isotones are in reasonable agreement with cranking model calculations. Possible reasons for the inhibition of backbending in the h9/2 proton bands in the odd-/b Z/, /b N/=96 isotones, all related to a change of deformation, are presented.
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