In-beam measurements of sub-nanosecond nuclear lifetimes with a mixed array of HPGe and LaBr3:Ce detectors

Studies of exotic nuclei with advanced radiation detectors

“…These scintillation detectors have much better energy resolution, about 3% at 662 keV, than traditional scintillation materials. In addition, they are very fast, a property which can be exploited to measure lifetimes of excited states in the 100 ps -10 ns region (Marginean et al, 2010). At DESPEC a fast-timing array is under construction (Regan, 2012).…”

Half-life of the yrast2+state in188W: Evolution of deformation and collectivity in neutron-rich tungsten isotopes

“…The energy dependence of the time response ("time walk") of the LaBr 3 :Ce detectors was determined with a 60 Co source using the method described in Ref. [11] in which the time response of each detector is fitted with a polynomial function and corrected down to ∼100 keV in offline analysis. The half-lives of excited states populated in the reaction were measured by extracting the time difference between γ rays observed in pairs of LaBr 3 :Ce detectors.…”

“…The timing information in each LaBr 3 :Ce detector was recorded relative to the master trigger and the time difference between any two detectors was found by subtracting their times relative to the trigger as described in Ref. [11]. Three-dimensional E γ 1 -E γ 2 -T histograms (cubes) were constructed in such a way that the time difference between two transitions can be obtained by gating on their photopeaks on the energy axes of the cube [11].…”

“…[11]. Three-dimensional E γ 1 -E γ 2 -T histograms (cubes) were constructed in such a way that the time difference between two transitions can be obtained by gating on their photopeaks on the energy axes of the cube [11].…”

“…The experiment employed fast-timing techniques with the LaBr 3 :Ce scintillator and high-purity germanium (HPGe) detector array [11] at the National Institute of Physics and Nuclear Engineering (IFIN-HH), Bucharest. Excited states 044301-1 0556-2813/2013/88(4)/044301 (6) ©2013 American Physical Society in 188 W have previously been investigated using multinucleon transfer reactions [12,13] and β-delayed spectroscopy [9] which found the structure to be consistent with an increased γ softness and decreased quadrupole moment compared to the stable W isotopes.…”