The strength of electric monopole transitions in the decay out of superdeformed bands is discussed on the basis of the mixing of superdeformed and normal-deformed states. The decay of superdeformed bands in the mass-190 region as well as the decay of the bands in ${}^{133}$Nd and ${}^{135}$Nd is investigated. Even though the values obtained for the electric monopole strength are very large, it is shown that $E$0 transitions cannot play an important role in the decay of superdeformed bands.

• Received 31 March 1997

DOI:https://doi.org/10.1103/PhysRevC.55.R2760