M1 and E2 transition rates from core-excited states in semi-magic $^{94}$Ru

• Published in: The European physical journal. A, Hadrons and nuclei Hadrons and nuclei, 2018-09, Vol.54 (9)
• Main Authors: Ertoprak, A., Cederwall, B., Qi, C., Doncel, M., Jakobsson, U., Nyakó, B.M., Jaworski, G., Davies, P., de France, G., Kuti, I., Napoli, D.R., Wadsworth, R., Ghugre, S.S., Raut, R., Akkus, B., Al Azri, H., Algora, A., de Angelis, G., Atac, A., Bäck, T., Boso, A., Clément, E., Debenham, D.M., Dombrádi, Zs, Ertürk, S., Gadea, A., Ghazi Moradi, F., Gottardo, A., Hüyük, T., Ideguchi, E., Li, H., Michelagnoli, C., Modamio, V., Nyberg, J., Palacz, M., Petrache, C.M., Recchia, F., Sandzelius, M., Siciliano, M., Timár, J., Valiente-Dobón, J.J., Xiao, Z.G.
• Format: Article
• Language: English
• Subjects: Nuclear Experiment; Nuclear Theory; Physics
• ISSN: 1434-6001; 1434-601X
• DOI: 10.1140/epja/i2018-12581-7

Lifetimes of high-spin states have been measured in the semi-magic $(N=50)$ nucleus$^{94}$Ru. Excited states in$^{94}$Ru were populated in the$^{58}$Ni($^{40}$Ca, 4p)$^{94}$Ru$^{*}$ fusion-evaporation reaction at the Grand Accélérateur National d’Ions Lourds (GANIL) accelerator complex. DSAM lifetime analysis was performed on the Doppler broadened line shapes in energy spectra obtained from $\gamma$ -rays emitted while the residual nuclei were slowing down in a thick 6mg/cm^2 metallic$^{58}$Ni target. In total eight excited-state lifetimes in the angular momentum range $I = (13-20)\hbar$ have been measured, five of which were determined for the first time. The corresponding B(M1) and B(E2) reduced transition strengths are discussed within the framework of large-scale shell model calculations to study the contribution of different particle-hole configurations, in particular for analyzing contributions from core-excited configurations.