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Joakim

Joakim Cederkäll

Professor

Joakim

Quadrupole and octupole collectivity in the semi-magic nucleus 20680Hg126

Author

  • L. Morrison
  • K. Hadyńska-Klȩk
  • Zs. Podolyák
  • L.P. Gaffney
  • M. Zielińska
  • B.A. Brown
  • H. Grawe
  • P.D. Stevenson
  • T. Berry
  • A. Boukhari
  • M. Brunet
  • R. Canavan
  • R. Catherall
  • J. Cederkäll
  • S.J. Colosimo
  • J.G. Cubiss
  • H. De Witte
  • D.T. Doherty
  • Ch. Fransen
  • G. Georgiev
  • E. Giannopoulos
  • M. Górska
  • H. Hess
  • L. Kaya
  • T. Kröll
  • N. Lalović
  • B. Marsh
  • Y. Martinez Palenzuela
  • G. O'Neill
  • J. Pakarinen
  • J.P. Ramos
  • P. Reiter
  • J.A. Rodriguez
  • D. Rosiak
  • S. Rothe
  • M. Rudigier
  • M. Siciliano
  • E. C. Simpson
  • J. Snall
  • P. Spagnoletti
  • S. Thiel
  • N. Warr
  • F. Wenander
  • R. Zidarova

Summary, in English

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; 2+1 → 0+1) = 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+10-30 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.

Department/s

  • Nuclear physics

Publishing year

2023

Language

English

Publication/Series

Physics Letters B

Volume

838

Document type

Journal article

Publisher

Elsevier

Topic

  • Subatomic Physics

Status

Published

ISBN/ISSN/Other

  • ISSN: 0370-2693