Papst, O. ; Werner, V. ; Isaak, J. ; Pietralla, N. ; Beck, T. ; Bernards, C. ; Bhike, M. ; Cooper, N. ; Crider, B. P. ; Friman-Gayer, U. ; Kleemann, J. ; Krishichayan, . ; Löher, B. ; Naqvi, F. ; Peters, E. E. ; Prados-Estévez, F. M. ; Ilieva, R. S. ; Ross, T. J. ; Savran, D. ; Tornow, W. ; Vanhoy, J. R. (2020)
Photo response of Dy-164.
In: Physical Review C, 102 (3)
doi: 10.1103/physrevc.102.034323
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Background: Little data is available for the pygmy dipole resonance (PDR) in axially deformed nuclei. Photon-scattering experiments are complicated by high level densities in the PDR region and the small energy difference of transitions to the ground state and to excited states.
Purpose: We report on an experimental study of the low-energy dipole strength distribution of the well-deformed nucleus 164Dy between 4.0–7.7 MeV.
Methods: The low-lying photoresponse of 164Dy has been investigated using the method of nuclear resonance fluorescence using a quasimonochromatic linearly polarized γ-ray beam in the energy range of 4.0–7.7 MeV in steps of 0.2 MeV.
Results: For excitation energies between 4 MeV and 5 MeV, sufficiently low level densities allow for the identification of individual states, including level energies, reduced transition widths and branching ratios. Energy-averaged mean decay branching ratios, mean population ratios and partial absorption cross sections were determined above 5 MeV up to the neutron-separation threshold at 7.7 MeV. A Lorentzian-shaped enhancement of the partial photo absorption cross section followed by decays back to the ground-state band is found at 6.10(5) MeV with a width of 0.77(23) MeV. A comparison with results from complementary measurements is performed using the framework of the statistical model.
Conclusions: The experimental results for the mean population ratios deviate systematically from the statistical model simulation by 30(6)%. However, they are in agreement within one standard deviation of the simulation.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2020 |
| Autor(en): | Papst, O. ; Werner, V. ; Isaak, J. ; Pietralla, N. ; Beck, T. ; Bernards, C. ; Bhike, M. ; Cooper, N. ; Crider, B. P. ; Friman-Gayer, U. ; Kleemann, J. ; Krishichayan, . ; Löher, B. ; Naqvi, F. ; Peters, E. E. ; Prados-Estévez, F. M. ; Ilieva, R. S. ; Ross, T. J. ; Savran, D. ; Tornow, W. ; Vanhoy, J. R. |
| Art des Eintrags: | Bibliographie |
| Titel: | Photo response of Dy-164 |
| Sprache: | Englisch |
| Publikationsjahr: | 21 September 2020 |
| Verlag: | APS |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Physical Review C |
| Jahrgang/Volume einer Zeitschrift: | 102 |
| (Heft-)Nummer: | 3 |
| DOI: | 10.1103/physrevc.102.034323 |
| Kurzbeschreibung (Abstract): | Background: Little data is available for the pygmy dipole resonance (PDR) in axially deformed nuclei. Photon-scattering experiments are complicated by high level densities in the PDR region and the small energy difference of transitions to the ground state and to excited states. Purpose: We report on an experimental study of the low-energy dipole strength distribution of the well-deformed nucleus 164Dy between 4.0–7.7 MeV. Methods: The low-lying photoresponse of 164Dy has been investigated using the method of nuclear resonance fluorescence using a quasimonochromatic linearly polarized γ-ray beam in the energy range of 4.0–7.7 MeV in steps of 0.2 MeV. Results: For excitation energies between 4 MeV and 5 MeV, sufficiently low level densities allow for the identification of individual states, including level energies, reduced transition widths and branching ratios. Energy-averaged mean decay branching ratios, mean population ratios and partial absorption cross sections were determined above 5 MeV up to the neutron-separation threshold at 7.7 MeV. A Lorentzian-shaped enhancement of the partial photo absorption cross section followed by decays back to the ground-state band is found at 6.10(5) MeV with a width of 0.77(23) MeV. A comparison with results from complementary measurements is performed using the framework of the statistical model. Conclusions: The experimental results for the mean population ratios deviate systematically from the statistical model simulation by 30(6)%. However, they are in agreement within one standard deviation of the simulation. |
| Freie Schlagworte: | Deutsche Forschungsgemeinschaft, DFG, German Research Foundation, Project-ID 279384907, SFB 1245, Nuclear Photonics, Nukleare Photonik, BMBF 05P18RDEN9, Helmholtz Graduate School for Hadron and Ion Research of the Helmholtz Association |
| Fachbereich(e)/-gebiet(e): | DFG-Sonderforschungsbereiche (inkl. Transregio) DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 1245: Atomkerne von fundamentalen Wechselwirkungen zu Struktur und Sternen 05 Fachbereich Physik 05 Fachbereich Physik > Institut für Kernphysik 05 Fachbereich Physik > Institut für Kernphysik > Experimentelle Kernphysik 05 Fachbereich Physik > Institut für Kernphysik > Experimentelle Kernphysik > Experimentelle Kernstruktur und S-DALINAC |
| Hinterlegungsdatum: | 15 Nov 2023 09:11 |
| Letzte Änderung: | 17 Jan 2024 16:18 |
| PPN: | 514772824 |
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