Abstract
To study how collective nuclear structure evolves towards mid-shell and test next-generation LaBr3(Ce) scintillation detectors, measurements of the lifetimes of 21+ states in 168Hf and 174W were conducted at the Wright Nuclear Structure Laboratory. Preliminary results indicate that the excellent time and energy resolution of LaBr3 detectors make them well suited to fast timing measurements, allowing for improved background subtraction and peak resolution in comparison to BaF2 detectors. Preliminary analysis shows an order of magnitude reduction in the statistical error of the 2+ lifetimes in comparison to literature values for both nuclei. In the case of 174W, a substantial reduction of the observed lifetime hints at the possibility of new physics in the region.
Highlights
Preliminary results indicate that the excellent time and energy resolution of LaBr3 detectors make them well suited to fast timing measurements, allowing for improved background subtraction and peak resolution in comparison to BaF2 detectors
High-precision measurements of electromagnetic transition strengths are one of the key observables required for studying nuclear structure phenomena
Despite the important role transition strengths play in our understanding of nuclear structure, precision measurements of these quantities—generally obtained via excited state lifetime measurements—can be difficult to carry out
Summary
High-precision measurements of electromagnetic transition strengths are one of the key observables required for studying nuclear structure phenomena. Transition strengths provide model-independent information on the evolution of nuclear collective excitations as a function of nucleon number [1,2] and help illuminate the location and possible alteration of nuclear shell structure for systems with exotic proton-to-neutron ratios. Despite the important role transition strengths play in our understanding of nuclear structure, precision measurements of these quantities—generally obtained via excited state lifetime measurements—can be difficult to carry out. 2B+1 ()Ev2a;lu0e+1s are derived from lifetime measurements, → 2+1 ) ∝ 1/τ(2+1 ). One of the most straightforward ways to measure lifetimes is via the fasttiming electronics method
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