Evolution of collectivity in 126,128Xe studied in Coulomb excitation measurements

• Published in: EPJ Web of Conferences Vol. 284; p. 02004
• Main Authors: Kisyov, Stanimir, Ching-Yen, Wu, Henderson, Jack, Gade, Alexandra, Kaneko, Kazunari, Sun, Yang, Shimizu, Noritaka, Mizusaki, Takahiro, Rhodes, Daniel, Biswas, Sayani, Chester, Aaron, Devlin, Matthew, Farris, Peter, Hill, Ava M, Li, Jing, Rubino, Elizabeth, Weisshaar, Dirk
• Format: Conference Proceeding Journal Article
• Language: English
• Published: Les Ulis EDP Sciences 01.01.2023
• Subjects: Banded structure; Cyclotrons; Excitation; Gamma rays; Lead isotopes; Nuclei; Quadrupoles; Rigid rotors
• ISSN: 2101-6275; 2100-014X
• DOI: 10.1051/epjconf/202328402004

The characteristics of 126,128Xe were investigated in Coulomb excitation measurements performed at the National Superconducting Cyclotron Laboratory (NSCL) Re-accelerator facility, ReA3, Michigan State University (MSU). The Xe nuclei were accelerated to sub-barrier energies and were impinged on 196Pt and 208Pb targets in separate experimental runs. The scattered nuclei and the de-excitation γ-rays were detected using the JANUS setup. Electromagnetic matrix elements were extracted from the experimental data with the help of the GOSIA/GOSIA2 codes. The results were compared to schematic Davydov-Filippov γ-rigid rotor theoretical calculations and large-scale calculations within a newly-established microscopic shell model (called PMMU model). The experimental results agree well with the theoretical predictions, except for the quadrupole moments of the second 2+ states in both nuclei, therefore challenging the interpretation of the γ-bands structure.