Ries, P. C. ; Pai, H. ; Beck, T. ; Beller, J. ; Bhike, M. ; Derya, V. ; Gayer, U. ; Isaak, J. ; Löher, B. ; Krishichayan, ; Mertes, L. ; Pietralla, N. ; Romig, C. ; Savran, D. ; Schilling, M. ; Tornow, W. ; Typel, S. ; Werner, V. ; Wilhelmy, J. ; Zilges, A. ; Zweidinger, M. (2019)
Valence-shell dependence of the pygmy dipole resonance: E1 strength difference in Cr-50,54.
In: Physical Review C, 100 (2)
doi: 10.1103/PhysRevC.100.021301
Article, Bibliographie
Abstract
Background: The low-lying electric dipole strength provides insights into the parameters of the nuclear equation of state via its connection with the pygmy dipole resonance and nuclear neutron skin thickness.
Purpose: The aim was to complement the systematic of the pygmy dipole resonance and first study its behavior across the N=28 neutron shell closure.
Methods: Photon-scattering cross sections of states of 50,54Cr were measured up to an excitation energy of 9.7 MeV via the nuclear resonance fluorescence method using γ-ray beams from bremsstrahlung and Compton backscattering.
Results: Transitions strengths, spin and parity quantum number, and average branching ratios for 55 excited states, 44 of which were observed for the first time, were determined. The comparison between the total observed strengths of the isotopes 50,52,54Cr shows a significant increase above the shell closure.
Conclusions: The evolution of the pygmy dipole resonance is heavily influenced by the shell structure.
| Item Type: | Article |
|---|---|
| Erschienen: | 2019 |
| Creators: | Ries, P. C. ; Pai, H. ; Beck, T. ; Beller, J. ; Bhike, M. ; Derya, V. ; Gayer, U. ; Isaak, J. ; Löher, B. ; Krishichayan, ; Mertes, L. ; Pietralla, N. ; Romig, C. ; Savran, D. ; Schilling, M. ; Tornow, W. ; Typel, S. ; Werner, V. ; Wilhelmy, J. ; Zilges, A. ; Zweidinger, M. |
| Type of entry: | Bibliographie |
| Title: | Valence-shell dependence of the pygmy dipole resonance: E1 strength difference in Cr-50,54 |
| Language: | English |
| Date: | 5 August 2019 |
| Publisher: | American Physical Society |
| Journal or Publication Title: | Physical Review C |
| Volume of the journal: | 100 |
| Issue Number: | 2 |
| DOI: | 10.1103/PhysRevC.100.021301 |
| Abstract: | Background: The low-lying electric dipole strength provides insights into the parameters of the nuclear equation of state via its connection with the pygmy dipole resonance and nuclear neutron skin thickness. Purpose: The aim was to complement the systematic of the pygmy dipole resonance and first study its behavior across the N=28 neutron shell closure. Methods: Photon-scattering cross sections of states of 50,54Cr were measured up to an excitation energy of 9.7 MeV via the nuclear resonance fluorescence method using γ-ray beams from bremsstrahlung and Compton backscattering. Results: Transitions strengths, spin and parity quantum number, and average branching ratios for 55 excited states, 44 of which were observed for the first time, were determined. The comparison between the total observed strengths of the isotopes 50,52,54Cr shows a significant increase above the shell closure. Conclusions: The evolution of the pygmy dipole resonance is heavily influenced by the shell structure. |
| Uncontrolled Keywords: | Deutsche Forschungsgemeinschaft, DFG, German Research Foundation, SFB 1245, Project-ID 279384907, BMBF, Grants No. 05P18RDEN9, No. 05P18PKEN |
| Identification Number: | Artikel-ID: 021301(R) |
| 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: | 20 Dec 2023 11:03 |
| Last Modified: | 13 Jan 2025 08:33 |
| PPN: | 515287210 |
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