Charge radii and electromagnetic moments of 195-211At

Research output: Contribution to journalArticle

Authors

  • Cubiss James G.
  • A. Barzakh
  • Maxim Seliverstov
  • Andrei N. Andreyev
  • Stanislav Antalic
  • Philippe Ascher
  • D. Atanasov
  • D. Beck
  • Bieron J.
  • K. Blaum
  • Ch. Borgmann
  • Martin Breitenfeldt
  • L. Capponi
  • Thomas Elias Cocolios
  • T. Day Goodacre
  • X. Derkx
  • Hilde De Witte
  • Jytte Elseviers
  • D Fedorov
  • Valentin N. Fedosseev
  • S. Fritzsche
  • Liam Paul Gaffney
  • S. George
  • F. P. Hessberger
  • Mark Huyse
  • N. Imai
  • Z. Kalaninova
  • D. Kisler
  • Ulli Koester
  • M. Kowalska
  • S. Kreim
  • Joseph Lane
  • Valentina Liberati
  • D. Lunney
  • Kara M Lynch
  • V. Manea
  • Bruce A Marsh
  • S. Mitsuoka
  • P.L. Molkanov
  • Y. Nagame
  • D. Neidherr
  • K. Nishio
  • S. Ota
  • Deyan Radulov
  • Elisa Rapisarda
  • J. P. Revill
  • M. Rosenbusch
  • R.E. Rossel
  • S. Rothe
  • K. Sandhu
  • L. Schweikhard
  • Simon Sels
  • V.L. Truesdale
  • Celine Van Beveren
  • Paul Van den Bergh
  • Y. Wakabayashi
  • Piet Van Duppen
  • K. Wendt
  • F. Wienholtz
  • B. W. Whitmore
  • G. L. Wilson
  • R.N. Wolf
  • K. Zuber

Institutes & Expert groups

  • University of York
  • PNPI - Petersburg Nuclear Physics Institute
  • Comenius University Bratislava
  • Max Planck Institute for Nuclear Physics
  • GSI - Helmholtzzentrum für Schwerionenforschung GmbH - Germany
  • Jagiellonian University
  • KUL - Katholieke Universiteit Leuven - Institute for Nuclear and Radiation Physics
  • CERN - Conseil Européen pour la Recherche Nucléaire
  • University of Liverpool - Oliver Lodge Laboratory
  • TU - Technische Universität Dresden - Thomas Wöhling
  • UWS - University of the West of Scotland
  • University of Manchester
  • KUL - Katholieke Universiteit Leuven
  • CSNSM-IN2P3-CNRS - Université Paris Sud
  • ASRC - Advanced Science Research Center - JAEA
  • CERN - Medicis-Promed
  • IPP - Max-Planck-Institut für Plasmaphysik
  • Ernst-Moritz-Arndt-Universität Greifswald - Institut für Physik
  • JAEA - Japan Atomic Energy Agency
  • NRCKI - National research Center Kurchatov Institute

Documents & links

DOI

Abstract

Hyperfine-structure parameters and isotope shifts of 195–211At have been measured for the first time at CERN-ISOLDE, using the in-source resonance-ionization spectroscopy method. The hyperfine structures of isotopes were recorded using a triad of experimental techniques for monitoring the photo-ion current. The Multi-Reflection Time-of-Flight Mass Spectrometer, in connection with a high-resolution electron multiplier, was used as an ion-counting setup for isotopes that either were affected by strong isobaric contamination or possessed a long half-life; the ISOLDE Faraday cups were used for cases with high-intensity beams; and the Windmill decay station was used for short-lived, predominantly α-decaying nuclei. The electromagnetic moments and changes in the mean-squarecharge radii of the astatine nuclei have been extracted from the measured hyperfine-structure constants and isotope shifts. This was only made possible by dedicated state-of-the-art large-scale atomic computations of the electronic factors and the specific mass shift of atomic transitions in astatine that are needed for these extractions. By comparison with systematics, it was possible to assess the reliability of the results of these calculations and their ascribed uncertainties. A strong deviation in the ground-state mean-square charge radii of the lightest astatine isotopes, from the trend of the (spherical) lead isotopes, is interpreted as the result of an onset of deformation. This behavior bears a resemblance to the deviation observed in the isotonic polonium isotopes. Cases for shape coexistence have been identified in 197,199At, for which a significant difference in the charge radii for ground (9/2−) and isomeric (1/2+) states has been observed.

Details

Original languageEnglish
Article number054327
Pages (from-to)1-19
Number of pages19
JournalPhysical Review C
Volume97
Issue number054327
DOIs
StatePublished - 29 May 2018

Keywords

  • laser spectroscopy, ISOLDE, astatine

ID: 4272338