Negative Drive of γ Deformation in Rapidly Rotating N=88,90 Nuclei

摘要

正 In the N=88,90 region,a strong negative drive of γ deformation is generatedby the second lowest positive signature vi_13/2 quasiparticle orbital.In contrast,thelowest positive-parity and negative-parity orbitals in this region exhibit positive drivesin the γ deformation toward oblate shapes.Replacing one of these with the negativedrive orbital strengthens the collectivity for the side band configurations at very highspins.