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Article
Title	Quadrupole and octupole collectivity in the semi-magic nucleus 80206Hg126
Author(s)	Morrison, L (Surrey U.) ; Hadyńska-Klȩk, K (Warsaw U., Heavy Ion Lab ; Surrey U.) ; Podolyák, Zs (Surrey U.) ; Gaffney, L P (Liverpool U. ; CERN) ; Zielińska, M (IRFU, Saclay) ; Brown, B A (Michigan State U., East Lansing (main)) ; Grawe, H (Darmstadt, GSI) ; Stevenson, P D (Surrey U.) ; Berry, T (Surrey U.) ; Boukhari, A (CSNSM, Orsay) ; Brunet, M (Surrey U.) ; Canavan, R (Surrey U. ; Teddington, Natl. Phys. Lab) ; Catherall, R (CERN) ; Cederkäll, J (Lund U.) ; Colosimo, S J (Aberdeen U.) ; Cubiss, J G (York U., England ; CERN) ; De Witte, H (Leuven U.) ; Doherty, D T (Surrey U.) ; Fransen, Ch (Cologne U.) ; Georgiev, G (IJCLab, Orsay ; CSNSM, Orsay) ; Giannopoulos, E (Jyvaskyla U. ; CERN) ; Górska, M (Darmstadt, GSI) ; Hess, H (Cologne U.) ; Kaya, L (Cologne U.) ; Kröll, T (Darmstadt, Tech. U.) ; Lalović, N (Lund U.) ; Marsh, B (CERN) ; Martinez Palenzuela, Y (CERN ; Leuven U.) ; O'Neill, G (Western Cape U. ; iThemba LABS) ; Pakarinen, J (Jyvaskyla U.) ; Ramos, J P (CERN) ; Reiter, P (Cologne U.) ; Rodriguez, J A (CERN) ; Rosiak, D (Cologne U.) ; Rothe, S (CERN) ; Rudigier, M (Surrey U.) ; Siciliano, M (IRFU, Saclay ; INFN, Legnaro) ; Simpson, E C (Australian Natl. U., Canberra) ; Snall, J (CERN ; Lund U.) ; Spagnoletti, P (West Scotland U.) ; Thiel, S (Cologne U.) ; Warr, N (Cologne U.) ; Wenander, F (CERN) ; Zidarova, R (CERN)
Publication	2023
Number of pages	5
In:	Phys. Lett. B 838 (2023) 137675
DOI	10.1016/j.physletb.2023.137675 (publication)
Subject category	Nuclear Physics - Experiment
Accelerator/Facility, Experiment	CERN HIE ISOLDE
Abstract	The first low-energy Coulomb-excitation measurement of the radioactive, semi-magic, two proton-hole nucleus 206Hg, was performed at CERN's recently-commissioned HIE-ISOLDE facility. Two γ rays depopulating low-lying states in 206Hg were observed. From the data, a reduced transition strength B(E2;21+→01+)=4.4(6) W.u. was determined, the first such value for an N=126 nucleus south of 208Pb, which is found to be slightly lower than that predicted by shell-model calculations. In addition, a collective octupole state was identified at an excitation energy of 2705 keV, for which a reduced B(E3) transition probability of 30−13+10 W.u. was extracted. These results are crucial for understanding both quadrupole and octupole collectivity in the vicinity of the heaviest doubly-magic nucleus 208Pb, and for benchmarking a number of theoretical approaches in this key region. This is of particular importance given the paucity of data on transition strengths in this region, which could be used, in principle, to test calculations relevant to the astrophysical r-process.
Copyright/License	publication: © 2023-2024 The Author(s) (License: CC BY 4.0), sponsored by SCOAP³

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