Speaker
Description
Lifetimes of the $2_1^+$, $4_1^+$, $6_1^+$, $2_{\gamma}^+$ and $3_{\gamma}^+$ states in $^{104,106}$Ru were measured using the recoil-distance Doppler shift technique and the Cologne Plunger device [1]. Low-lying excited states in both nuclei were populated in a $^{104}$Ru($^{18}$O, $^{18}$O\textquotesingle)$^{104}$Ru* inelastic scattering and in a $^{104}$Ru($^{18}$O, $^{16}$O)$^{106}$Ru two-neutron transfer reaction at the Cologne FN Tandem accelerator. The experimental energy levels and deduced electromagnetic transition probabilities are discussed in the context of $\gamma$-softness and the mapped interacting-boson model with input from the microscopic self-consistent mean-field calculation using a Gogny interaction [2]. The newly obtained results for the $\gamma$ band, give a more detailed insight about the triaxial behavior of $^{104,106}$Ru. The results will be discussed in the context of $\gamma$ soft and rigid triaxial behavior which is present in the neutron-rich Ru isotopes [3].
[1] A. Dewald, O. Möller, and P. Petkov, Progress in Particle and Nuclear Physics 67, 786 (2012).
[2] K. Nomura, R. Rodríguez-Guzmán, and L. M. Robledo, Phys. Rev. C 94, 044314 (2016).
[3] A. Esmaylzadeh, A. Blazhev, K. Nomura, J. Jolie, M. Beckers, C. Fransen, R.-B. Gerst, A. Harter, V. Karayonchev, L. Knafla, M. Ley, and F. von Spee, Phys. Rev. C 106, 064323 (2022).
