Excitation of multiple giant dipole resonances: from spherical to deformed nuclei

Andrés, M. V.; Lanza, E. G.; Isacker, P. Van; Volpe, Cristina; Catara, F.

doi:10.1016/s0370-2693(99)01220-4

Cited by 1 publication

(2 citation statements)

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“…Properties of giant dipole resonance (GDR) have also been explored by other authors [7][8][9][10]. Specifically, resonances of this type have also been examined using Hartree-Fock-Bogoliubov approaches [11], the Random Phase Approximation [12,13], as well as various other IBA-based theories [6,[14][15][16][17][18][19][20][21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

“…This integration of the IBA and GDR modes -especially for transitional nuclei -has also been discussed in Refs. [6,14,16,[18][19][20][21][22][23][24][25][26][27]. An important additional advantage of using a mixed-mode spd -IBA system of this type is that it allows one to re-examine resultant level spacings in terms of their regularity and/or chaoticity.…”

Section: Introductionmentioning

confidence: 99%

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Properties of giant dipole resonances within an extended pairing model with a focus on spectral statistics

et al. 2021

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In this paper, we report on a study of the spectral features associated with dipole resonances in medium mass nuclei (E ≤ 12 MeV), as revealed in the framework of the spd -interacting boson model. The effect of pairing correlations on the theory follows from solutions obtained through an application of the Bethe Ansatz Equation. In general, calculated spectra around the critical point of the vibrational to γ-soft transitions appears to approach that of a Gaussian Orthogonal Ensemble, while near the rotational and vibrational limits of the theory the spectra show more regular behavior. Specifically, the results reveal that the statistical features of the spectra are sensitive to the vector boson pairing strength, cp, in the transition region; that is, when cp is zero, or when the system approaches one of its dynamical symmetries limits the spectrum display regular features, while for stronger cp values, or when near to the critical phase transition region, the spectral feature show more chaotic behavior. Overall, our results indicate that the statistical features are governed by the interplay between dipole resonant energies, pairing correlations, and interactions between and among the single and vector bosons modes of the theory. As part of this work we also found out that chaoticity occurs when results were fit to a Berry-Robnik distribution. Throughout our analyses, we used experimentally known information about both positive and negative parity states. Our findings suggest that dipole resonances appear to be best-described by Poisson statistics for A ≈ 32-138 nuclei.

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