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arxiv: 1907.12274 · v1 · pith:3QMZQVNXnew · submitted 2019-07-29 · ⚛️ nucl-ex

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

B. Olaizola , A.B. Garnsworthy , G.C. Ball , N. Bernier , M. Bowry , R. Caballero-Folch , I. Dillmann , S. Georges
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G. Hackman J. Smallcombe J. K. Smith D. Southall E. Timakova R. Umashankar F. A. Ali H. Bidaman V. Bildstein C. Burbadge A. Diaz Varela R.A. Dunlop M. Dunlop P.E. Garrett B. Hadina B. Jigmeddorj D. Kisliuk A. Laffoley A. MacLean D. Muecher A. Radich E.T. Rand C.E. Svensson J. Turko T. Zidar C. Andreoiu F. Garcia J.L. Pore U. Rizwan K. Starosta P. Voss J. Williams
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keywords statesdifferentgriffinlifetimeswereachievedallowsarray
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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.

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