2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/230219We extend the classical Landau theory for rotating nuclei and show that the backbending in 162Yb, that comes about as a result of the two-quasiparticle alignment, is identified with the second order phase transition. We found that the backbending in 156Dy, caused by the instability of $γ$-vibrations in the rotating frame, corresponds to the first order phase transition.4 pages, 2 figuresNuclear Theorytext