Abstract
Ground state rotational bands in the deformed doubly-even rare earth nuclei158,160Er,164,166Yb, and168Hf have been observed in (α, 8n γ) reactions. The γ-spectra associated with these reactions were studied in-beam using conventional spectroscopic methods. In all five nuclei the nuclear moment of inertia of the ground state rotational states was found to increase abruptly as higher spin states were attained. In a plot of the moment of inertia as a function of the angular velocity all these five nuclei display “backbending” curves. Moreover, in158Er and166Yb, the curves after passing through a maximum bend subsequently downwards.
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The authors thank Professor Amand Faessler for valuable discussions, Dr. U. Schwinn for the manufacture of the self-supporting metallic targets and Mr. Z. Seres for providing a computer code for analysis of two parameter spectra. In particular the technical help and assistance during the data collection provided by Mr. H. M. Jäger is gratefully appreciated. The authors would also like to acknowledge the support provided by the operating crew of the cyclotron.
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Lieder, R.M., Beuscher, H., Davidson, W.F. et al. Experimental study of high spin states in the ground state bands of158,160Er,164,166Yb, and168Hf. Z. Physik 257, 147–176 (1972). https://doi.org/10.1007/BF01403545
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DOI: https://doi.org/10.1007/BF01403545