Abstract. In this proceedings the increasing axial asymmetry in the N = 90 isotopes with decreasing atomic number from ¹⁵²Sm to ¹⁴⁸Ce is shown. The placement of the nuclei of interest into the Interacting Boson Model symmetry triangle and the calculations of the approximate effective γ deformation shows the existence of some axial asymmetry, γ^appr_eff ≈ 10°, in ¹⁴⁸Ce, while the N = 90 ¹⁵²Sm does not show any. Moreover, the shape evolution study of the cerium, neodymium and samarium chains shows the over all increasing axially asymmetry with decreasing atomic number.

doi: https://doi.org/10.55318/bgjp.2022.49.1.089

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