Lifetimes and electromagnetic transition strengths in 155 Dy
2013
Recoil distance Doppler-shift and Doppler-shift attenuation lifetime measurements were carried out for levels in ${}^{155}$Dy through the coincident detection of $\ensuremath{\gamma}$ rays. Twenty-six lifetimes, most of them for the first time, were determined using the differential decay curve method for the analysis of the data. At low and medium spins, particle-plus-triaxial-rotor calculations reveal different quadrupole deformations for the one-quasineutron bands in this transitional nucleus. At high spin, the reduced $B(E2)$ transition probabilities confirm with a better precision the results of a previous study implying decreased collectivity with increasing spin.
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