Inverse odd-even staggering in nuclear charge radii and possible octupole collectivity in 217,218,219At revealed by in-source laser spectroscopy

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  • A. E. Barzakh
  • Cubiss James G.
  • Andrei N. Andreyev
  • Maxim Seliverstov
  • B. Andel
  • Stanislav Antalic
  • Philippe Ascher
  • Dimitar Atanasov
  • Dietrichg Beck
  • Jacek Bieron
  • Klaus Blaum
  • Christopher Borgmann
  • Martin Breitenfeldt
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  • Xavier Derkx
  • Hilde De Witte
  • Jytte Elseviers
  • Dmitry V. Fedorov
  • Valentin N. Fedosseev
  • Stephan Fritzsche
  • Liam Paul Gaffney
  • S. George
  • Fritz Peter Hessberger
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  • Nobuaki Imai
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  • Ulli Koester
  • Magdalena Kowalska
  • S. Kreim
  • Joseph F.W. Lane
  • Valentina Liberati
  • David Lunney
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  • Vladimir Manea
  • Bruce A Marsh
  • S. Mitsuoka
  • Pavel Molkanov
  • Y. Nagame
  • Dennis Neidherr
  • K. Nishio
  • S. Ota
  • Deyan Radulov
  • Elisa Rapisarda
  • J. P. Revill
  • M. Rosenbusch
  • Ralf Erik Rossel
  • Sebastian Rothe
  • Karanjeet Sandhu
  • Lutz Schweikhard
  • Simon Sels
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  • Paul Van den Bergh
  • Piet Van Duppen
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  • G.L. Wilson
  • R.N. Wolf
  • Kai Zuber

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Hyperfine-structure parameters and isotope shifts for the 795-nm atomic transitions in 217,218,219At have been measured at CERN-ISOLDE, using the in-source resonance-ionization spectroscopy technique. Magnetic dipole and electric quadrupole moments, and changes in the nuclear mean-square charge radii, have been deduced. A large inverse odd-even staggering in radii, which may be associated with the presence of octupole collectivity, has been observed. Namely, the radius of the odd-odd isotope 218At has been found to be larger than the average of its even-N neighbors, 217,219At. The discrepancy between the additivity-rule prediction and experimental data for the magnetic moment of 218At also supports the possible presence of octupole collectivity in the considered nuclei.


Original languageEnglish
Article number054317
Pages (from-to)1-9
Number of pages9
JournalPhysical Review C
StatePublished - 14 May 2019


  • ISOLDE, laser, spectroscopy, shape coexistence, octupole deformation, Nuclear data

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