Shape coexistence in the neutron-deficient lead region: A systematic study of lifetimes in the even-even ${}^{188-200}$Hg with GRIFFIN

Abstract

Lifetimes of $2_1^{+}$ and $4_1^{+}$ states, as well as some negative-parity and non-yrast states, in ${}^{188-200}$Hg were measured using $\gamma -\gamma$ electronic fast timing techniques with the LaBr${}_3$(Ce) detector array of the GRIFFIN spectrometer. The excited states were populated in the $\epsilon /{\beta }^{+}$-decay of $J^{\pi }=7^{+}/2^{-}$ ${}^{188-200}$Tl produced at the TRIUMF-ISAC facility. The deduced B(E2) values are compared to different interacting boson model predictions. The precision achieved in this work over previous ones allows for a meaningful comparison with the different theoretical models of these transitional Hg isotopes, which confirms the onset of state mixing in ${}^{190}$Hg.

References in corpus (7)

• Tables of E2 Transition Probabilities from the first $2^{+}$ States in Even-Even Nuclei
• Nuclear shape coexistence: A study of the even-even Hg isotopes using the interacting boson model with configuration mixing
• Shape staggering of mid-shell mercury isotopes from in-source laser spectroscopy compared with Density Functional Theory and Monte Carlo Shell Model calculations
• Shape evolution and the role of intruder configurations in Hg isotopes within the interacting boson model based on a Gogny energy density functional
• The GRIFFIN Facility for Decay-Spectroscopy Studies at TRIUMF-ISAC
• The GRIFFIN Data Acquisition System
• Enhanced time response of 1-in. LaBr3(Ce) crystals by leading edge and constant fraction techniques

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• Shape coexistence in the neutron-deficient ${}^{188}$Hg investigated via lifetime measurements
• ${}^{145}$Ba and ${}^{145,146}$La structure from lifetime measurements
• Nuclear structure properties of ${}^{193-200}$Hg isotopes within large-scale shell model calculations
• Re examination of \b{eta} decay in Hg, Pb and Po Isotopes
• Simultaneous $\gamma$-ray and electron spectroscopy of ${}^{182,184,186}$Hg isotopes