Statistics of 2+ Levels in Even-Even Nuclei

Details Statistics of 2+ Levels in Even-Even Nuclei Statistics of 2+ Levels in Even-Even Nuclei

2002-12-13

arxiv.org/abs/nucl-th/0212057v2

Phys.Lett. B579 (2004) 278-284

Physics

Nuclear Physics

Nuclear Theory

11 pages, 2 figures; v2: added references; layout improved

Scientific paper

Using all the available empirical information, we analyze the spacing distributions of low-lying 2-plus levels of even-even nuclei. To obtain statistically relevant samples, the nuclei are grouped into classes defined by the ratio R4/2 of the excitation energies of the first 4-plus and 2-plus levels. This ratio serves as a measure of collectivity in nuclei. With the help of Bayesian inference, we determine the chaoticity parameter for each class. This parameter is found to vary strongly with R4/2 and takes particularly small values in nuclei that have one of the dynamical symmetries of the interacting Boson model.

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