Elsevier

Nuclear Physics A

Volume 593, Issue 1, 9 October 1995, Pages 21-47
Nuclear Physics A

Search for nuclei exhibiting the U(5) dynamical symmetry

https://doi.org/10.1016/0375-9474(95)00314-QGet rights and content

Abstract

The level energy spectra of a set of 26 nuclei presenting a vibrational structure were analyzed using a simple U(5) prescription in the IBM-1 framework. Twelve of these nuclei are relatively well fitted and present level patterns in accordance to the model predictions. They are thus confirmed or possible U(5) nuclei. The analysis suggests that they present extensive multiphonon structures. This implies the survival of such structures at higher energies. The experimental B(E2) values between multiphonon states are shown to agree with the finite N dependence predicted by the IBM. It is also observed that the 21+ energies are quite generally about 15% lower than expected from the global nuclear properties.

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    Present address: Department of Physics and Astronomy, University of Kentucky, Lexington, KY 40506, USA.

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