The first observation of superdeformation in the mass region A≃190 is reported. A rotational band of twelve transitions with an average energy spacing of 37 keV, an average moment of inertia of 110 , and an average quadrupole moment of 18±3 e b has been observed in ; this band persists at low rotational frequency. These results are in excellent agreement with a calculation that predicts an ellipsoidal axis ratio of 1.65:1 for the superdeformed shape in this nucleus.
- Received 8 March 1989
- Published in the issue dated 24 July 1989
© 1989 The American Physical Society