Evolution of Octupole Deformation in Radium Nuclei from Coulomb Excitation of Radioactive ^{222}Ra and ^{228}Ra Beams

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There is sparse direct experimental evidence that atomic nuclei can exhibit stable "pear" shapes arising from strong octupole correlations. In order to investigate the nature of octupole collectivity in radium isotopes, electric octupole (E3) matrix elements have been determined for transitions in ^{222,228}Ra nuclei using the method of sub-barrier, multistep Coulomb excitation. Beams of the radioactive radium isotopes were provided by the HIE-ISOLDE facility at CERN. The observed pattern of E3 matrix elements for different nuclear transitions is explained by describing ^{222}Ra as pear shaped with stable octupole deformation, while ^{228}Ra behaves like an octupole vibrator.


  • P. A. Butler
  • L. P. Gaffney
  • P. Spagnoletti
  • K. Abrahams
  • M. Bowry
  • G. de Angelis
  • H. De Witte
  • P. E. Garrett
  • A. Goldkuhle
  • C. Henrich
  • A. Illana
  • K. Johnston
  • D. T. Joss
  • J. M. Keatings
  • N. A. Kelly
  • M. Komorowska
  • J. Konki
  • T. Kröll
  • M. Lozano
  • B. S. Nara Singh
  • D. O'Donnell
  • J. Ojala
  • R. D. Page
  • C. Raison
  • P. Reiter
  • D. Rosiak
  • S. Rothe
  • M. Scheck
  • M. Seidlitz
  • T. M. Shneidman
  • B. Siebeck
  • J. Sinclair
  • J. F. Smith
  • M. Stryjczyk
  • P. Van Duppen
  • S. Vinals
  • V. Virtanen
  • N. Warr
  • K. Wrzosek-Lipska
  • M. Zielińska
Enheter & grupper
Externa organisationer
  • University of Liverpool
  • CERN
  • University of the West of Scotland
  • University of the Western Cape
  • Laboratori Nazionali di Legnaro
  • Catholic University of Leuven
  • University of Guelph
  • University of Cologne
  • Technical University of Darmstadt
  • University of Warsaw
  • University of Jyväskylä
  • Helsinki Institute of Physics
  • University of York
  • Joint Institute for Nuclear Research
  • Spanish Council of Scientific Research (CSIC)
  • Paris Descartes University
  • University of Oslo

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Subatomär fysik
Antal sidor1
TidskriftPhysical Review Letters
Utgåva nummer4
StatusPublished - 2020 jan 31
Peer review utfördJa