Elsevier

Nuclear Physics A

Volume 555, Issue 3, 19 April 1993, Pages 563-584
Nuclear Physics A

Signature splitting in octupole bands of vibrational and deformed nuclei

https://doi.org/10.1016/0375-9474(93)90488-JGet rights and content

Abstract

Energy staggering in negative-parity bands is studied in both vibrational and deformed regions. Good agreement is found between empirical signature patterns and those calculated in the IBA. It is shown that the calculations in each region depend essentially on only a single parameter. It is found that each kind of structural region displays unique and characteristic signature behaviour. In γ-soft [O(6)] nuclei the staggering is large and nearly independent of J. Octupole staggering can actually be used as a signature for this symmetry. In deformed regions, signature effects in K = 1 bands show a striking singularity as a function of the filling of a shell, which, both experimentally and theoretically, is shown to be due to the crossing and mixing of K = 0 and 1 bands. Finally, it is found that, albeit for different reasons in different structural regions, the signature splitting of low-lying negative-parity states in vibrational and deformed regions (K = 1 bands) is almost always opposite in phase with that of positive-parity γ-bands: the only exception is at the very beginning of deformed regions.

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