Intrinsic quadrupole moment of the superdeformed band in /sup 152/Dy

The attenuation of the Doppler shift has been measured for ..gamma.. rays emitted from the superdeformed states in the nucleus /sup 152/Dy, recoiling in a /sup 108/Pd 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 exb, in excellent agreement with the value expected for a superdeformed shape.