Abstract
Structural changes both along and above the yrast line have been observed in experiments performed with the Argonne-Notre Dame BGO Gamma Facility at ATLAS. Transitions from prolate to oblate shapes have been detected in transitional Dy nuclei. Above the yrast line, quasicontinuum E2 transitions reveal clear signatures of structural changes which may be related to phase transitions predicted by theory. Superdeformed hands have been discovered in some of these nuclei, as well as in a new region of superdeformation in 191Hg. The initial population of the superdeformed bands appears to be close to the secondary minimum and may explain why the SD bands, which lie several MeV above the yrast line, do not rapidly tunnel to the normal states.
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