Abstract
The hyperfine structures and isotope shifts of 14 isotopes of Eu (Z=63) in the mass range 140≦A≦153, partly with isomeric states, have been measured in the atomic transitions at 4,594 Å and 4,627 Å, using the technique of collinear fast-beam laser spectroscopy at the ISOLDE facility at CERN. The nuclear spins, the magnetic dipole and electric quadrupole moments, and the changes in the mean square charge radii have been evaluated. These nuclear parameters clearly reflect the effects of theN=82 neutron-shell closure in the single-proton hole states with respect to the semi-magic gadolinium (Z=64), and theN=88−90 shape transition.
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Dedicated in occasion of the 60th birthday of Prof. Dr. A. Steudel
On leave from Bhabha Atomic Research Centre, Bombay, India
We are grateful to Professor E.-W. Otten for helpful discussions and suggestions during the preparation of the paper. We would like to thank Professor R.M. Steffen for making available to us material not yet published.
This work was supported by the Bundesministerium für Forschung und Technologie and the Deutsche Forschungsgemeinschaft.
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Ahmad, S.A., Klempt, W., Ekström, C. et al. Nuclear spins, moments, and changes of the mean square charge radii of140−153Eu. Z Physik A 321, 35–45 (1985). https://doi.org/10.1007/BF01411941
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DOI: https://doi.org/10.1007/BF01411941