Étude du schéma de niveaux de 225Ac

The ²²⁵Ac level scheme, populated by the α-branching (0.25%) of ²²⁹Pa, was investigated with an α-spectrograph and a two-dimensional α-γ coincidence device. The proposed level scheme was interpreted in terms of rotational bands and we tried to describe it in terms of the Nilsson configurations $\text{3}\text{2}{}^{\mathrm{+}}\text{651],}\text{5}\text{2}{}^{\mathrm{+}}\text{642],}\text{3}\text{2}{}^{\mathrm{?}}\text{532],}\text{and}\text{5}\text{2}{}^{\mathrm{?}}\text{523]}$. The perturbation bands due to the Coriolis coupling were also discussed.