Zeitschrift für Physik A Atomic Nuclei

, Volume 334, Issue 1, pp 103–108 | Cite as

Nuclear radii of thorium isotopes from laser spectroscopy of stored ions

  • W. Kälber
  • J. Rink
  • K. Bekk
  • W. Faubel
  • S. Göring
  • G. Meisel
  • H. Rebel
  • R. C. Thompson
Physics with Stored Ions


Isotope shifts and hyperfine splittings in optical transitions for atomic ions of the thorium isotopes227Th to230Th and232Th have been measured by laser spectroscopy on stored ions. From the isotope shift data, changes of the mean square charge radii are determined. A continuous increase of the charge radius with mass numberA is observed, in agreement with droplet model calculations. The results indicate that the odd-even staggering for Th is different from that one of the neighbouring isotones of Fr and Ra. There is some empirical evidence from systematics for an inversion of the staggering and the appearance of an octupole deformation atN ≦137. The hyperfine splitting for229Th for 3 electronic levels is given.


21.10.F 21.60 27.90 29.90 31.30.G 32.50.F 32.80.K 35.10.F 35.80 42.60.K 


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Copyright information

© Springer-Verlag 1989

Authors and Affiliations

  • W. Kälber
    • 1
  • J. Rink
    • 1
  • K. Bekk
    • 1
  • W. Faubel
    • 2
  • S. Göring
    • 1
  • G. Meisel
    • 1
  • H. Rebel
    • 1
  • R. C. Thompson
    • 3
  1. 1.Kernforschungszentrum KarlsruheInstitut für KernphysikKarlsruheFederal Republic of Germany
  2. 2.Institut für RadiochemieKarlsruheFederal Republic of Germany
  3. 3.Blackett LaboratoryImperial CollegeLondonGreat Britain

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