Lifetime measurements of normally deformed and superdeformed states in82Sr

Abstract

Lifetimes of a superdeformed band in ${}^{82}$Sr were measured with the centroid shift method. The measured average quadrupole moment of this band corresponds to a quadrupole deformation of ${\ensuremath{\beta}}_{2}\ensuremath{\approx}0.49$, which is slightly smaller than both the theoretical prediction, and the measured deformation of the SD band in the neighboring isotone ${}^{84}$Zr. Lifetimes of high spin states of three normally deformed rotational bands in ${}^{82}$Sr were also measured with the Doppler shift attenuation method technique. The quadrupole moments of these normally deformed bands show a decrease at the highest spins, supporting the predicted band terminations.