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M1 and E2 transition rates from core-excited states in semi-magic 94Ru

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Lifetimes of high-spin states have been measured in the semi-magic \((N=50)\) nucleus 94Ru. Excited states in 94Ru were populated in the 58Ni(40Ca, 4p)94Ru* 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 58Ni 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.

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Correspondence to A. Ertoprak.

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Communicated by A. Gade

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Ertoprak, A., Cederwall, B., Qi, C. et al. M1 and E2 transition rates from core-excited states in semi-magic 94Ru. Eur. Phys. J. A 54, 145 (2018).

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