Lifetime measurement for the $2_1^+$ of $^{174}$W using fast timing with LaBr$_3$ scintillators

Past experiment suggests nuclei in the rare-earth region exhibit a saturation of deformation as mid-neutron-shell is approached on the isotopic chain. Precision measurements of the B(E2:$2_1^+\rightarrow 0_1^+$) of these nuclei will help clarify the structure in this region and may serve as a test for theoretical models for well-deformed nuclei. Fast timing measurements after beta decay have been performed on $^{174}$W at WNSL, Yale University. The standard fast timing technique drew great benefits from LaBr$_3$ scintillators. The high energy resolution of these scintillators, with time resolution comparable to BaF$_2$ scintillators, allows for a much enhanced peak-to-background ratio, the placement of narrow energy gates, and accurate background subtraction. The result is a cleaner time difference spectra than possible with BaF$_2$ scintillators. Results will be presented.