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Collectivity in the light radon nuclei measured directly via Coulomb excitation

Research output: Contribution to journalArticle

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Author(s)

  • L. P. Gaffney
  • A. P. Robinson
  • M. Bender
  • A. Blazhev
  • N. Bree
  • B. Bruyneel
  • P. A. Butler
  • T. E. Cocolios
  • T. Davinson
  • A. N. Deacon
  • H. De Witte
  • D. Dijulio
  • J. Diriken
  • A. Ekström
  • Ch Fransen
  • S. J. Freeman
  • K. Geibel
  • T. Grahn
  • B. Hadinia
  • M. Hass
  • P. H. Heenen
  • H. Hess
  • M. Huyse
  • U. Jakobsson
  • N. Kesteloot
  • J. Konki
  • Th Kröll
  • V. Kumar
  • O. Ivanov
  • S. Martin-Haugh
  • D. Mücher
  • R. Orlandi
  • J. Pakarinen
  • A. Petts
  • P. Peura
  • P. Rahkila
  • P. Reiter
  • M. Scheck
  • M. Seidlitz
  • K. Singh
  • J. F. Smith
  • J. Van De Walle
  • P. Van Duppen
  • D. Voulot
  • N. Warr
  • F. Wenander
  • K. Wimmer
  • K. Wrzosek-Lipska
  • M. Zielińska

Department/unit(s)

Publication details

JournalPhysical Review C
DatePublished - 22 Jun 2015
Issue number6
Volume91
Original languageEnglish

Abstract

Background: Shape coexistence in heavy nuclei poses a strong challenge to state-of-the-art nuclear models, where several competing shape minima are found close to the ground state. A classic region for investigating this phenomenon is in the region around Z=82 and the neutron midshell at N=104. Purpose: Evidence for shape coexistence has been inferred from α-decay measurements, laser spectroscopy, and in-beam measurements. While the latter allow the pattern of excited states and rotational band structures to be mapped out, a detailed understanding of shape coexistence can only come from measurements of electromagnetic matrix elements. Method: Secondary, radioactive ion beams of Rn202 and Rn204 were studied by means of low-energy Coulomb excitation at the REX-ISOLDE in CERN. Results: The electric-quadrupole (E2) matrix element connecting the ground state and first excited 21+ state was extracted for both Rn202 and Rn204, corresponding to B(E2;21+→01+)=29-8+8 and 43-12+17 W.u., respectively. Additionally, E2 matrix elements connecting the 21+ state with the 41+ and 22+ states were determined in Rn202. No excited 0+ states were observed in the current data set, possibly owing to a limited population of second-order processes at the currently available beam energies. Conclusions: The results are discussed in terms of collectivity and the deformation of both nuclei studied is deduced to be weak, as expected from the low-lying level-energy schemes. Comparisons are also made to state-of-the-art beyond-mean-field model calculations and the magnitude of the transitional quadrupole moments are well reproduced.

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