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Nuclear level densities and γ -ray strength functions in 120,124Sn isotopes: Impact of Porter-Thomas fluctuations

Markova, M. ; Larsen, A. C. ; von Neumann-Cosel, P. ; Bassauer, S. ; Görgen, A. ; Guttormsen, M. ; Garrote, F. L. Bello ; Berg, H. C. ; Bjørøen, M. M. ; 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. (2022)
Nuclear level densities and γ -ray strength functions in 120,124Sn isotopes: Impact of Porter-Thomas fluctuations.
In: Physical Review C, 106 (3)
doi: 10.1103/physrevc.106.034322
Article, Bibliographie

Abstract

Nuclear level densities (NLDs) and γ-ray strength functions (GSFs) of 120,124Sn have been extracted with the Oslo method from proton-γ coincidences in the (p,p′γ) reaction. The functional forms of the GSFs and NLDs have been further constrained with the Shape method by studying primary γ-transitions to the ground and first excited states. The NLDs demonstrate good agreement with the NLDs of 116,118,122Sn isotopes measured previously. Moreover, the extracted partial NLD of 1− levels in 124Sn is shown to be in fair agreement with those deduced from spectra of relativistic Coulomb excitation in forward-angle inelastic proton scattering. The experimental NLDs have been applied to estimate the magnitude of the Porter-Thomas (PT) fluctuations. Within the PT fluctuations, we conclude that the GSFs for both isotopes can be considered to be independent of initial and final excitation energies, in accordance with the generalized Brink-Axel hypothesis. Particularly large fluctuations observed in the Shape-method GSFs present a considerable contribution to the uncertainty of the method and may be one of the reasons for deviations from the Oslo-method strength at low γ-ray energies and low values of the NLD (below ≈1×103–2×103MeV−1).

Item Type: Article
Erschienen: 2022
Creators: Markova, M. ; Larsen, A. C. ; von Neumann-Cosel, P. ; Bassauer, S. ; Görgen, A. ; Guttormsen, M. ; Garrote, F. L. Bello ; Berg, H. C. ; Bjørøen, M. M. ; 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.
Type of entry: Bibliographie
Title: Nuclear level densities and γ -ray strength functions in 120,124Sn isotopes: Impact of Porter-Thomas fluctuations
Language: English
Date: 27 September 2022
Publisher: APS
Journal or Publication Title: Physical Review C
Volume of the journal: 106
Issue Number: 3
DOI: 10.1103/physrevc.106.034322
Abstract:

Nuclear level densities (NLDs) and γ-ray strength functions (GSFs) of 120,124Sn have been extracted with the Oslo method from proton-γ coincidences in the (p,p′γ) reaction. The functional forms of the GSFs and NLDs have been further constrained with the Shape method by studying primary γ-transitions to the ground and first excited states. The NLDs demonstrate good agreement with the NLDs of 116,118,122Sn isotopes measured previously. Moreover, the extracted partial NLD of 1− levels in 124Sn is shown to be in fair agreement with those deduced from spectra of relativistic Coulomb excitation in forward-angle inelastic proton scattering. The experimental NLDs have been applied to estimate the magnitude of the Porter-Thomas (PT) fluctuations. Within the PT fluctuations, we conclude that the GSFs for both isotopes can be considered to be independent of initial and final excitation energies, in accordance with the generalized Brink-Axel hypothesis. Particularly large fluctuations observed in the Shape-method GSFs present a considerable contribution to the uncertainty of the method and may be one of the reasons for deviations from the Oslo-method strength at low γ-ray energies and low values of the NLD (below ≈1×103–2×103MeV−1).

Uncontrolled Keywords: Deutsche Forschungsgemeinschaft, DFG, German Research Foundation, SFB 1245, Project-ID 279384907, Research Cluster ELEMENTS, Project ID No. 500/10.006, Nukleare Photonik
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: 14 Nov 2023 13:23
Last Modified: 22 Jan 2024 09:54
PPN: 514895349
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