Bibliographic Details
| Title: |
Direct demonstration of the two-phonon structure of the $J^{\pi} = 1_{4742~\mathrm{keV}}^{-}$ state of $^{88}$Sr |
| Authors: |
Isaak, J., Savran, D., Pietralla, N., Tsoneva, N., Zilges, A., Eberhardt, K., Geppert, C., Gorges, C., Lenske, H., Renisch, D. |
| Publication Year: |
2023 |
| Collection: |
Nuclear Experiment |
| Subject Terms: |
Nuclear Experiment |
| More Details: |
We have studied the decay pattern of the $J^{\pi} = 1_{4742~\mathrm{keV}}^{-}$ state of $^{88}$Sr 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 $1_{4742~\mathrm{keV}}^{-} \to 3_{1}^{-}$ transition into the one-octupole-phonon state. $\gamma$-ray spectroscopy was performed after the $\beta$-decay of $^{88}$Rb to obtain the necessary sensitivity for this weak-intensity decay branch. Sufficient amounts of $^{88}$Rb (T$_{1/2}$ = 17.8 min) were produced by neutron activation of natural Rb in the TR IGA Mark II reactor. The results show that the $B(E2)$ value of the $1_{4742~\mathrm{keV}}^{-} \to 3_{1}^{-}$ transition is equal to the $B(E2)$ of the $2_{1}^{+} \to 0_{1}^{+}$ 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 rema rkable agreement, corroborating this assignment. |
| Document Type: |
Working Paper |
| DOI: |
10.1103/PhysRevC.108.L051301 |
| Access URL: |
http://arxiv.org/abs/2311.01132 |
| Accession Number: |
edsarx.2311.01132 |
| Database: |
arXiv |
