Spectral fluctuations in the interacting boson model
Abstract The energy dependence of the spectral fluctuations in the interacting boson model (IBM) and its connections to the mean-field structures are analyzed by adopting two statistical measures: the nearest neighbor level spacing distribution measuring the chaoticity (regularity) in energy spectra...
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| Published in: | Chinese physics C 2022-10, Vol.46 (10), p.104101 |
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| Main Authors: | , , , , , |
| Format: | Article |
| Language: | eng |
| Online Access: | Get full text |
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| Summary: | Abstract
The energy dependence of the spectral fluctuations in the interacting boson model (IBM) and its connections to the mean-field structures are analyzed by adopting two statistical measures: the nearest neighbor level spacing distribution
measuring the chaoticity (regularity) in energy spectra and the
statistics of Dyson and Metha measuring the spectral rigidity. Specifically, the statistical results as functions of the energy cutoff are determined for different dynamical scenarios, including the
U
(5)-
SU
(3) and
SU
(3)-
O
(6) transitions as well as those near the AW arc of regularity. We observe that most of the changes in spectral fluctuations are triggered near the stationary points of the classical potential, particularly for cases in the deformed region of the IBM phase diagram. Thus, the results justify the stationary point effects from the perspective of statistics. In addition, the approximate degeneracies in the
spectrum on the AW arc is also revealed from the statistical calculations. |
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| ISSN: | 1674-1137 0254-3052 |