Quadrupole–hexadecapole coupling in the rare earth region with beyond mean field correlations R. Rodríguez-Guzmán and L. M. Robledo Eur. Phys. J. A, 61 7 (2025) 166 Published online: 17 July 2025 DOI: 10.1140/epja/s10050-025-01638-x