Isaak, J. ; Savran, D. ; Pietralla, N. ; Tsoneva, N. ; Zilges, A. ; Eberhardt, K. ; Geppert, C. ; Gorges, C. ; Lenske, H. ; Renisch, D. (2023)
Direct demonstration of the two-phonon structure of the Jπ=14742keV− state of Sr88.
In: Physical Review C, 108 (5)
doi: 10.1103/PhysRevC.108.L051301
Article, Bibliographie
Abstract
We have studied the decay pattern of the Jπ=1−4742keV state of 88Sr to probe its quadrupole-octupole coupled two-phonon structure. In particular, a unique fingerprint to prove the two-phonon nature is the E2 decay strength of the 1−4742keV→3−1 transition into the one-octupole-phonon state. γ-ray spectroscopy was performed after the β decay of 88Rb to obtain the necessary sensitivity for this weak-intensity decay branch. Sufficient amounts of 88Rb (T1/2=17.8 min) were produced by neutron activation of natural Rb in the TRIGA Mark II reactor. The results show that the B(E2) value of the 1−4742keV→3−1 transition is equal to the B(E2) of the 2+1→0+1 transition, directly demonstrating the quadrupole-octupole coupled two-phonon nature of the 1− state. A comparison of the results with energy-density functional plus quasiparticle-phonon model calculations shows remarkable agreement, corroborating this assignment.
| Item Type: | Article |
|---|---|
| Erschienen: | 2023 |
| Creators: | Isaak, J. ; Savran, D. ; Pietralla, N. ; Tsoneva, N. ; Zilges, A. ; Eberhardt, K. ; Geppert, C. ; Gorges, C. ; Lenske, H. ; Renisch, D. |
| Type of entry: | Bibliographie |
| Title: | Direct demonstration of the two-phonon structure of the Jπ=14742keV− state of Sr88 |
| Language: | English |
| Date: | 1 November 2023 |
| Publisher: | APS |
| Journal or Publication Title: | Physical Review C |
| Volume of the journal: | 108 |
| Issue Number: | 5 |
| DOI: | 10.1103/PhysRevC.108.L051301 |
| Abstract: | We have studied the decay pattern of the Jπ=1−4742keV state of 88Sr to probe its quadrupole-octupole coupled two-phonon structure. In particular, a unique fingerprint to prove the two-phonon nature is the E2 decay strength of the 1−4742keV→3−1 transition into the one-octupole-phonon state. γ-ray spectroscopy was performed after the β decay of 88Rb to obtain the necessary sensitivity for this weak-intensity decay branch. Sufficient amounts of 88Rb (T1/2=17.8 min) were produced by neutron activation of natural Rb in the TRIGA Mark II reactor. The results show that the B(E2) value of the 1−4742keV→3−1 transition is equal to the B(E2) of the 2+1→0+1 transition, directly demonstrating the quadrupole-octupole coupled two-phonon nature of the 1− state. A comparison of the results with energy-density functional plus quasiparticle-phonon model calculations shows remarkable agreement, corroborating this assignment. |
| Uncontrolled Keywords: | Deutsche Forschungsgemeinschaft, DFG, German Research Foundation, Project-ID 499256822 - GRK 2891, Research Cluster ELEMENTS, Project ID No. 500/10.006, LOEWE-Schwerpunkt "Nukleare Photonik" |
| Divisions: | Forschungsfelder Forschungsfelder > Matter and Materials Forschungsfelder > Matter and Materials > Nuclear Science 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: | 08 Nov 2023 12:17 |
| Last Modified: | 27 Nov 2023 13:36 |
| PPN: | 513497080 |
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