Abstract
A detailed investigation of the energies and intensities of the γ-rays that depopulate the low spin levels of the β- and γ-vibrational bands of156Gd and the γ-vibrational band of158Gd has been conducted. Both singles and γ-γ coincidence measurements were made on sources of 15-d156Eu and 46-min158Eu by use of large volume, high resolution Ge(Li) detectors.
In addition to the γ-band at 1154.09 keV, twoK π=0+ bands were observed in156Gd with band heads at 1049.45 and 1168.11 keV, respectively. The 2+ and 3+ members of the γ-vibrational band in158Gd were observed at 1187.12 and 1265.43 keV, respectively, as well as a newK π=0+ band at 1195.98 keV. A first order perturbational treatment of the branching ratios was applied to both nuclei. In addition, the mixing between the ground state, the β-, and the γ-vibrational bands of156Gd is considered from two approaches, but neither satisfactorily explains all the experimentalB(E2) ratios.
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Oak Ridge Associated Universities Fellow from Vanderbilt University, Nashville, Tennessee.
Operated by Union Carbide Corporation for the U. S. Atomic Energy Commission.
Work supported in part by a grant from the National Science Foundation.
The authors are most grateful to Dr. L. L. Riedinger for his very helpful suggestions for this manuscript and for supplying us with Coulomb excitation data prior to publication. In addition, we wish to thank A. R. Brosi and B. H. Ketelle for the help and use of their equipment in some of these measurements; J. J. Pinajian and S. Raman, and the Oak Ridge Isotopes Development Center for the use of a multichannel analyzer in many of the measurements; R. J. Silva for his help in some of the chemical separations; and the Operating Staff of the Oak Ridge Isochronous Cyclotron for their help in producing many of the sources necessary for these experiments.
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Kluk, A.F., Johnson, N.R. & Hamilton, J.H. Band mixing in156Gd and158Gd. Z. Physik 253, 1–12 (1972). https://doi.org/10.1007/BF01387164
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DOI: https://doi.org/10.1007/BF01387164