Deformed single-particle levels are derived from a boson-fermion Hamiltonian in which the odd fermion occupies several j orbits. The geometric-oriented approach applied to ${}_{}{}^{169}{}_{}{}^{}\mathrm{Tm}$ clarified the role of algebraic interactions and provides an intuitive interpretation and guidance to numerical calculations in deformed nuclei.

• Received 15 May 1989

DOI:https://doi.org/10.1103/PhysRevLett.63.2204