A1 Journal article (refereed)
Broken seniority symmetry in the semimagic proton mid-shell nucleus 95Rh (2024)

Das, B., Cederwall, B., Qi, C., Górska, M., Regan P., H., Aktas, Ö., Albers H., M., Banerjee, A., Chishti M. M., R., Gerl, J., Hubbard, N., Jazrawi, S., Jolie, J., Mistry A., K., Nowacki, F., Polettini, M., Yaneva, A., Ahmed, U., Alhomaidhi, S., . . . Zhao, J. (2024). Broken seniority symmetry in the semimagic proton mid-shell nucleus 95Rh. Physical Review Research, 6(2), Article L022038. https://doi.org/10.1103/physrevresearch.6.l022038

JYU authors or editors

Publication details

All authors or editors: Das, B.; Cederwall, B.; Qi, C.; Górska, M.; Regan P., H.; Aktas, Ö.; Albers H., M.; Banerjee, A.; Chishti M. M., R.; Gerl, J.; et al.

Journal or series: Physical Review Research

eISSN: 2643-1564

Publication year: 2024

Publication date: 10/05/2024

Volume: 6

Issue number: 2

Article number: L022038

Publisher: American Physical Society

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1103/physrevresearch.6.l022038

Publication open access: Openly available

Publication channel open access: Open Access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/95181

Abstract

Lifetime measurements of low-lying excited states in the semimagic (N = 50) nucleus 95Rh have been performed by means of the fast-timing technique. The experiment was carried out using γ -ray detector arrays consisting of LaBr3(Ce) scintillators and germanium detectors integrated into the DESPEC experimental setup commissioned for the Facility for Antiproton and Ion Research (FAIR) Phase-0, Darmstadt, Germany. The excited states in 95Rh were populated primarily via the β decays of 95Pd nuclei, produced in the projectile fragmentation of a 850 MeV/nucleon 124Xe beam impinging on a 4 g/cm2 9Be target. The deduced electromagnetic E2 transition strengths for the γ -ray cascade within the multiplet structure depopulating from the isomeric Iπ =21/2+ state are found to exhibit strong deviations from predictions of standard shell model calculations which feature approximately conserved seniority symmetry. In particular, the observation of a strongly suppressed E2 strength for the 13/2+ → 9/2+ ground state transition cannot be explained by calculations employing standard interactions. This remarkable result may require revision of the nucleon-nucleon interactions employed in state-of-the-art theoretical model calculations, and might also point to the need for including three-body forces in the Hamiltonian.

Keywords: nuclear physics; particle physics

Free keywords: accelerators & beams; nuclear physics; nuclear structure & decays

Contributing organizations

Ministry reporting: Yes

Preliminary JUFO rating: 1