Das, B; Cederwall, B; Qi, C; Gorska, M; Regan, P H; Aktas, O; 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; Alhomaidh, S; Algora, A; Appleton, C; Arici, T; Bagchi, S; Benzoni, G; Benito, J; Blazhev, A; Boutachkov, P; Bracco, A; Bruce, A M; Brunet, M; Canavan, R; Davison, T; Dickel, T; Esmaylzadeh, A; Fraile, L M; Haettner, E; Hall, O; Hafner, G; Heggen, H; Hornung, Ch; Hucka, J P; John, P R; Kahl, D; Karayonchev, V; Kern, R; Knobel, R; Korgul, A; Kosir, G; Kojouharov, I; Kostyleva, D; Kuzminchuk, N; Kurz, N; Liotta, R; Lozeva, R; Mikolajczuk, M; Mukha, I; Napiralla, P; Page, R; Petrache, C M; Pietralla, N; Pietri, S; PlaB, W R; Podolyak, Zs; Regis, J M; Rudigier, M; Rosch, H; Ruotsalaineu, P; Sahin, E; Sanchez-Tembleque, V; Schaffner, H; Scheidenberger, C; Schirru, F; Sexton, L; Nara Singh, B S; Sharma, A; Shearman, R; Si, M; Tanaka, Y K; Vasiljevic, J; Vesic, J; Vilhena, J; Weick, H; Wollersheim, H J; Werner, V; Wiederhold, J; Witt, W; Woods, P J; Zimba, G; Zhao, J (2024) Broken seniority symmetry in the semimagic proton mid-shell nucleus 95Rh. Physical Review Research, 6. L022038

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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.

Item Type:	Article
Keywords:	nuclear structure physics; gamma-ray spectroscopy; fast-timing spectroscopy.
Subjects:	Ionising Radiation > Radioactivity
Divisions:	Medical, Marine & Nuclear
Identification number/DOI:	10.1103/PhysRevResearch.6.L022038
Last Modified:	01 Jul 2025 12:28
URI:	https://eprintspublications.npl.co.uk/id/eprint/10187