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The yrast lines in Kr isotopes with $N=42$, 44, and 46 are investigated in abeyond mean field framework with both prolate-oblate coexistence andquasiparticle alignment taken into account. Quasiparticle orbitals withhigh-$j$ and low-$\Omega$ on the oblate side are shown to be responsible forthe sharp backbending observed in $^{82}$Kr, by driving the yrast shape fromprolate to oblate. This suggests that quasiparticle alignment may not beneglected in the investigation of the shape evolution along the yrast line.

Prolate-to-oblate transition and backbending along the yrast line induced by quasiparticle alignment