Abstract
The de-excitation of the ground state rotational band in nine deformed even nuclei has been observed following heavy-ion nuclear reactions. The transitions from states up to spin 16 (on the average) were observed and their energies were measured with an accuracy of ±0.3%. The rotational spacings thus identified have been compared with several calculations, and much the best agreement is obtained with a simplified calculation by Davydov and Chaban taking into account the effects of centrifugal stretching of the nucleus.
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