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Using the particle-rotor model, the energy spectrum and the B(MI)/B(E2) ratio of the negative-parity yrast band in ~(155)Tb are investigated and compared with the experimental data before and after the band-crossing. It is noted that before and after the band-crossing the moment of inertia of the core is a smooth function of the total angular momentum I and can be described by the ah formula. The yrast band of ~(155)Tb with negative parity may be triaxially deformed (γ=~-13°) before and an axially symmetric shape (γ=0°) after the band-crossing.
Using the particle-rotor model, the energy spectrum and the B (MI) / B (E2) ratio of the negative-parity yrast band in (155) Tb are investigated and compared with the experimental data before and after the band-crossing . It is noted that before and after the band-crossing the moment of inertia of the core is a smooth function of the total angular momentum I and can be described by the ah formula. The yrast band of ~ (155) Tb with negative parity may be triaxially deformed (γ = ~ -13 °) before and an axially symmetric shape (γ = 0 °) after the band-crossing.