Intrinsic quadrupole moment of the superdeformed band inDy152

Abstract
The attenuation of the Doppler shift has been measured for γ rays emitted from the superdeformed states in the nucleus Dy152, recoiling in a Pd108 target and its gold backing. The transitions from the high-spin members of the superdeformed band are fully shifted, indicating feeding times of not more than a few femtoseconds. The partially shifted low-spin transitions yield a quadrupole moment of 19±3 e⋅b, in excellent agreement with the value expected for a superdeformed shape.