New Lifetime Measurements in the Ruthenium Chain: Investigating the Evolution of Triaxiality

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We have used the recoil distance Doppler-shift method to measure lifetimes of excited states in \(^{108}\mathrm {Ru}\), \(^{110}\mathrm {Ru}\), and \(^{112}\mathrm {Ru}\). Excited states in these nuclei were populated by fusion–fission reactions between a \(^{238}\)U beam and a \(^{9}\)Be target in an experiment at GANIL. Fission fragments were identified event by event in the VAMOS++ spectrometer, while \(\gamma \)-rays were detected by the Advanced Gamma Tracking Array (AGATA). The lifetimes in the ground state band are consistent with rotational structures and constant \(B\)(E2) values indicate that the deformation does not change significantly across the chain of studied ruthenium nuclei. Preliminary results for lifetimes of states in the \(\gamma \)-band indicate a well deformed triaxial shape with a \(\gamma \) parameter close to \(30^{\circ }\) in \(^{110}\mathrm {Ru}\), with a slight change towards oblate deformation in \(^{112}\mathrm {Ru}\). Abstract Published by the Jagiellonian University 2025 authors

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