%0 Journal Article
%T Broken seniority symmetry in the semimagic proton mid-shell nucleus 95Rh
%A Das, B. et al
%A Algora, A.
%J Physical Review Research
%D 2024
%V 6
%N 2
%I Amer Physical Soc
%G English
%F Das+Algora2024
%O WOS:001240855200002
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=6147), last updated on Fri, 21 Jun 2024 09:56:27 +0000
%X Lifetime measurements of low-lying excited states in the semimagic ( N = 50) nucleus 95 Rh have been performed by means of the fast -timing technique. The experiment was carried out using gamma -ray detector arrays consisting of LaBr 3 (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 95 Rh were populated primarily via the /3 decays of 95 Pd nuclei, produced in the projectile fragmentation of a 850 MeV / nucleon 124 Xe beam impinging on a 4 g / cm 2 9 Be target. The deduced electromagnetic E2 transition strengths for the gamma -ray cascade within the multiplet structure depopulating from the isomeric I pi = 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.
%R 10.1103/PhysRevResearch.6.L022038
%U https://doi.org/10.1103/PhysRevResearch.6.L022038
%P L022038 - 7pp