Journal article

Authors list: Isaak, J.; Savran, D.; Pietralla, N.; Tsoneva, N.; Zilges, A.; Eberhardt, K.; Geppert, C.; Gorges, C.; Lenske, H.; Renisch, D.

Publication year: 2023

Journal: Physical Review C

Volume number: 108

Issue number: 5

ISSN: 2469-9985

eISSN: 2469-9993

Open access status: Green

DOI Link: https://doi.org/10.1103/PhysRevC.108.L051301

Publisher: American Physical Society

Abstract: 
We have studied the decay pattern of the J pi = 1-4742 keV 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 1-4742 keV -> 3-1 transition into the one-octupole-phonon state. gamma -ray spectroscopy was performed after the beta 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 1-4742 keV -> 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.

Harvard Citation style: Isaak, J., Savran, D., Pietralla, N., Tsoneva, N., Zilges, A., Eberhardt, K., et al. (2023) Direct demonstration of the two-phonon structure of the Jπ=1-4742 keV state of 88Sr, Physical Review C, 108(5), Article L051301. https://doi.org/10.1103/PhysRevC.108.L051301

APA Citation style: 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=1-4742 keV state of 88Sr. Physical Review C. 108(5), Article L051301. https://doi.org/10.1103/PhysRevC.108.L051301