Abstract
Four superdeformed bands have been assigned to 
following a high-statistics 
-ray study using the EUROGAM II spectrometer. The bands are interpreted in terms of 
and 
signature-partner neutron configurations. One of the bands exhibits a sharp backbend when the 
orbital crosses the 
orbital at 
MeV/ 
. Below this crossing, the band is predicted to remain superdeformed despite the absence of N = 6 neutron intruders. This suggests that these intruders are not a necessary ingredient of superdeformation in this mass region but that the underlying shell gaps at Z = 58 and N = 72 are important.
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