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Studies of the Radioactive Decays of Eu152 and Eu154

L. L. Riedinger* and Noah R. Johnson†

J. H. Hamilton‡

  • Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830

  • Physics Department, Vanderbilt University, Nashville, Tennessee 37203

  • *Present address: University of Notre Dame, Notre Dame, Indiana.
  • †Operated by Union Carbide Corporation for the U. S. Atomic Energy Commission.
  • ‡Work supported in part by a grant from the National Science Foundation.
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Phys. Rev. C 2, 2358 – Published 1 December, 1970

DOI: https://doi.org/10.1103/PhysRevC.2.2358

Abstract

γ rays emitted in the radioactive decays of Eu152 and Eu154 have been studied with Ge(Li) and NaI detectors. Energies and relative intensities were derived from singles experiments with large volume Ge(Li) detectors and assignments of γ rays to transitions in the level schemes were made with the help of Ge(Li)-NaI coincidence measurements. In all, 71 γ rays were observed in the Eu152 decay and 51 in the Eu154 case. Three members of each of the β- and γ- vibrational bands were observed. In addition the results of the coincidence experiments are used to assign a level at 1649.8 keV as the probable 2− member of the K=2 band in Sm152. The properties of this state and of the Kπ=0− and 1− bands are compared with the properties of the corresponding states in Gd154. It is found that there is evidently less Coriolis coupling between the negative-parity states in Sm152 than in Gd154. The members of the Kπ=1− band in the former are not inverted as in the latter, and the B(E1) ratios from the Kπ=0− states in the former are in better agreement with the predictions of the rotational model. The low-energy levels in Gd152 are considered in light of two possible interpretations. We find that it is preferable to consider these states as resulting from quasirotations and quasivibrations than to treat them as members of one-, two-, and three-phonon vibrational excitations about spherical equilibrium shapes. Finally, a new 2+ level at 1293 keV in Sm152 is discussed in light of recent experiments involving two-neutron-transfer reactions to levels in this nucleus.

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Phys. Rev. C 2, 2358– Published 1 December, 1970
  • Received 6 April 1970

© 1970 American Physical Society

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