Lifetime measurements in the tungsten isotopes 176,178,180W

Lifetimes of yrast states in the rare-earth midshell isotopes W-176,W-178,W-180 have been measured with fast-timing methods using the Cologne iron-free Orange spectrometer and the Cologne HORUS spectrometer and with the recoil distance Doppler shift method using the Cologne coincidence plunger setup. Different fusion evaporation reactions have been used to populated excited states in the investigated nuclei. Lifetimes of the 2(1)(+) , 4(1)(+) , 6(1)(+) , and 8(1)(+) yrast states were measured in all three tungsten isotopes and in addition the lifetime of the 10(1)(+) state was measured in W-176. Quadrupole deformation parameters, reduced transition probabilities, and B-4/2 ratios are extracted and discussed in the context of interacting boson model 1 calculations. The results with newly determined signatures largely confirm the investigated tungsten isotopes to be deformed prolate rotors.

Automated summary

The lifetimes of rare-earth midshell isotopes of tungsten have been measured using different methods, and the results confirm that these tungsten isotopes are deformed prolate rotors.