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Comprehensive Test of the Brink-Axel Hypothesis in the Energy Region of the Pygmy Dipole Resonance

Markova, M. ; Neumann-Cosel, P. von ; Larsen, A. C. ; Bassauer, S. ; Görgen, A. ; Guttormsen, M. ; Bello Garrote, F. L. ; Berg, H. C. ; Bjørøen, M. M. ; Dahl-Jacobsen, T. ; Eriksen, T. K. ; Gjestvang, D. ; Isaak, J. ; Mbabane, M. ; Paulsen, W. ; Pedersen, L. G. ; Pettersen, N. I. J. ; Richter, A. ; Sahin, E. ; Scholz, P. ; Siem, S. ; Tveten, G. M. ; Valsdottir, V. M. ; Wiedeking, M. ; Zeiser, F. (2021)
Comprehensive Test of the Brink-Axel Hypothesis in the Energy Region of the Pygmy Dipole Resonance.
In: Physical Review Letters, 127 (18)
doi: 10.1103/physrevlett.127.182501
Article, Bibliographie

Abstract

The validity of the Brink-Axel hypothesis, which is especially important for numerous astrophysical calculations, is addressed for 116,120,124Sn below the neutron separation energy by means of three independent experimental methods. The γ-ray strength functions (GSFs) extracted from primary γ-decay spectra following charged-particle reactions with the Oslo method and with the shape method demonstrate excellent agreement with those deduced from forward-angle inelastic proton scattering at relativistic beam energies. In addition, the GSFs are shown to be independent of excitation energies and spins of the initial and final states. The results provide a critical test of the generalized Brink-Axel hypothesis in heavy nuclei, demonstrating its applicability in the energy region of the pygmy dipole resonance.

Item Type: Article
Erschienen: 2021
Creators: Markova, M. ; Neumann-Cosel, P. von ; Larsen, A. C. ; Bassauer, S. ; Görgen, A. ; Guttormsen, M. ; Bello Garrote, F. L. ; Berg, H. C. ; Bjørøen, M. M. ; Dahl-Jacobsen, T. ; Eriksen, T. K. ; Gjestvang, D. ; Isaak, J. ; Mbabane, M. ; Paulsen, W. ; Pedersen, L. G. ; Pettersen, N. I. J. ; Richter, A. ; Sahin, E. ; Scholz, P. ; Siem, S. ; Tveten, G. M. ; Valsdottir, V. M. ; Wiedeking, M. ; Zeiser, F.
Type of entry: Bibliographie
Title: Comprehensive Test of the Brink-Axel Hypothesis in the Energy Region of the Pygmy Dipole Resonance
Language: German
Date: 29 October 2021
Publisher: APS
Journal or Publication Title: Physical Review Letters
Volume of the journal: 127
Issue Number: 18
DOI: 10.1103/physrevlett.127.182501
Abstract:

The validity of the Brink-Axel hypothesis, which is especially important for numerous astrophysical calculations, is addressed for 116,120,124Sn below the neutron separation energy by means of three independent experimental methods. The γ-ray strength functions (GSFs) extracted from primary γ-decay spectra following charged-particle reactions with the Oslo method and with the shape method demonstrate excellent agreement with those deduced from forward-angle inelastic proton scattering at relativistic beam energies. In addition, the GSFs are shown to be independent of excitation energies and spins of the initial and final states. The results provide a critical test of the generalized Brink-Axel hypothesis in heavy nuclei, demonstrating its applicability in the energy region of the pygmy dipole resonance.

Uncontrolled Keywords: Deutsche Forschungsgemeinschaft, DFG, German Research Foundation, SFB 1245, Project-ID 279384907
Divisions: DFG-Collaborative Research Centres (incl. Transregio)
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 1245: Nuclei: From Fundamental Interactions to Structure and Stars
05 Department of Physics
05 Department of Physics > Institute of Nuclear Physics
05 Department of Physics > Institute of Nuclear Physics > Experimentelle Kernphysik
05 Department of Physics > Institute of Nuclear Physics > Experimentelle Kernphysik > Experimentelle Kernstruktur und S-DALINAC
Date Deposited: 15 Nov 2023 08:35
Last Modified: 05 Jan 2024 11:00
PPN: 51447629X
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