Abstract
The electromagnetic properties of levels up to spin 19ħ in the yrast band and 9ħ in the ground-state band of the odd-odd nucleus 160Ho have been measured with standard in-beam γ-ray spectroscopy using the 159Tb(α, 3n) reaction. For the yrast band, the experimental B(M1, I → I − 1)/ B(E2, I → I − 2) ratios increase sharply for rotational frequencies larger than 0.25 MeV, while observed energies do not show any sudden change. This effect suggests a change in the nature of the wave functions. The results are interpreted in terms of the particle-rotor model, cranking shell model and compared to the available data on the neighbouring odd-A nuclei.
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