The decay of 174Tm and mixing of the Kπ = 5? two-quasiparticle states in 174Yb

The decay of 5.4 min ¹⁷⁴Tm has been investigated using Ge(Li) spectrometers in singles and coincidence measurements. A total of 43 γ-ray transitions, 26 of them not reported before, have been observed following the decay of ¹⁷⁴Tm. All transitions could be placed in a level scheme comprising 19 excited states of ¹⁷⁴Yb. The Nilsson model has been used to interpret the level structure. The mixing of two-quasineutron and two-quasiproton states is studied and the experimental mixing matrix element is compared with the results of theoretical calculations.