The excitation energy, spin, and parity of the yrast superdeformed band in ${}^{152}\mathrm{Dy}$ have been firmly established. The evidence comes mainly from the measured properties of a 4011 keV single-step transition connecting the yrast superdeformed level fed by the 693 keV transition to the ${27}^{-}$ yrast state. Four additional, weaker, linking $\gamma$ rays have been placed as well. The excitation energy of the lowest superdeformed band member is 10 644 keV and its spin and parity are determined to be ${24}^{+}$.

• Received 17 August 2001

DOI:https://doi.org/10.1103/PhysRevLett.88.042501