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Spectral statistics and the fine structure of the electric pygmy dipole resonance in N=82 nuclei

Enders, J. ; Guhr, T. ; Heine, A. ; Neumann-Cosel, P. von ; Ponomarev, V. Yu. ; Richter, A. ; Wambach, J. (2004)
Spectral statistics and the fine structure of the electric pygmy dipole resonance in N=82 nuclei.
In: Nuclear Physics A, 741
doi: 10.1016/j.nuclphysa.2004.05.014
Article, Bibliographie

Abstract

We study the statistical properties of the electric pygmy dipole resonance in four different isotones with neutron number N=82. These nuclei are 13856Ba, 14058Ce, 14260Nd, 14462Sm. The data set comprises 184 levels with spin and parity J[pi]=1- and their ground state B(E1) transition strengths. The statistics are found to be "mixed", i.e., in between the predictions of random matrix theory for correlated and uncorrelated spectra. Moreover, we calculate spectra and transition strengths in the quasiparticle phonon model (QPM). We compare experimental and theoretical findings. The incompleteness of the data sets and its impact on the results is discussed. A consistent picture emerges which yields an improved understanding of the statistical properties of the pygmy resonance.

Item Type: Article
Erschienen: 2004
Creators: Enders, J. ; Guhr, T. ; Heine, A. ; Neumann-Cosel, P. von ; Ponomarev, V. Yu. ; Richter, A. ; Wambach, J.
Type of entry: Bibliographie
Title: Spectral statistics and the fine structure of the electric pygmy dipole resonance in N=82 nuclei
Language: English
Date: 6 September 2004
Publisher: Elsevier
Journal or Publication Title: Nuclear Physics A
Volume of the journal: 741
DOI: 10.1016/j.nuclphysa.2004.05.014
URL / URN: https://www.sciencedirect.com/science/article/pii/S037594740...
Abstract:

We study the statistical properties of the electric pygmy dipole resonance in four different isotones with neutron number N=82. These nuclei are 13856Ba, 14058Ce, 14260Nd, 14462Sm. The data set comprises 184 levels with spin and parity J[pi]=1- and their ground state B(E1) transition strengths. The statistics are found to be "mixed", i.e., in between the predictions of random matrix theory for correlated and uncorrelated spectra. Moreover, we calculate spectra and transition strengths in the quasiparticle phonon model (QPM). We compare experimental and theoretical findings. The incompleteness of the data sets and its impact on the results is discussed. A consistent picture emerges which yields an improved understanding of the statistical properties of the pygmy resonance.

Divisions: DFG-Collaborative Research Centres (incl. Transregio)
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres
05 Department of Physics
05 Department of Physics > Institute of Nuclear Physics
Zentrale Einrichtungen
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 634: Nuclear Structure, Nuclear Astrophysics and Fundamental Experiments at Low Momentum Transfer at the Superconducting Darmstadt Accelerator (S-DALINAC)
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 634: Nuclear Structure, Nuclear Astrophysics and Fundamental Experiments at Low Momentum Transfer at the Superconducting Darmstadt Accelerator (S-DALINAC) > A: Kernstrukturphysik
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 634: Nuclear Structure, Nuclear Astrophysics and Fundamental Experiments at Low Momentum Transfer at the Superconducting Darmstadt Accelerator (S-DALINAC) > A: Kernstrukturphysik > A2: Kernstrukturphysik mit virtuellen Photonen
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 634: Nuclear Structure, Nuclear Astrophysics and Fundamental Experiments at Low Momentum Transfer at the Superconducting Darmstadt Accelerator (S-DALINAC) > C: Fundamentale Experimente
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 634: Nuclear Structure, Nuclear Astrophysics and Fundamental Experiments at Low Momentum Transfer at the Superconducting Darmstadt Accelerator (S-DALINAC) > C: Fundamentale Experimente > C4: Quantenchaos und wellendynamisches Chaos
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 634: Nuclear Structure, Nuclear Astrophysics and Fundamental Experiments at Low Momentum Transfer at the Superconducting Darmstadt Accelerator (S-DALINAC) > D: Theoretische Kernstrukturphysik
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 634: Nuclear Structure, Nuclear Astrophysics and Fundamental Experiments at Low Momentum Transfer at the Superconducting Darmstadt Accelerator (S-DALINAC) > D: Theoretische Kernstrukturphysik > D2: Kernstrukturuntersuchungen mit Relevanz für das experimentelle Programm
Date Deposited: 19 Nov 2008 15:54
Last Modified: 24 Aug 2022 07:39
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