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
Article, Bibliographie
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.
| Item Type: | Article |
|---|---|
| Erschienen: | 2020 |
| Creators: | 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. |
| Type of entry: | Bibliographie |
| Title: | Photo response of Dy-164 |
| Language: | English |
| Date: | 21 September 2020 |
| Publisher: | APS |
| Journal or Publication Title: | Physical Review C |
| Volume of the journal: | 102 |
| Issue Number: | 3 |
| DOI: | 10.1103/physrevc.102.034323 |
| 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. |
| Uncontrolled Keywords: | 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 |
| 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 09:11 |
| Last Modified: | 17 Jan 2024 16:18 |
| PPN: | 514772824 |
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