The low-lying one-quasiparticle states are studied in the isotonic chains with $N=147$, 149, 151, 153, and 155 within the microscopic-macroscopic and self-consistent approaches. The energies of one-quasiparticle states change rather smoothly in the isotonic chains if there is no cross of the proton subshell. The $\alpha$-decay schemes of several nuclei are suggested. The isomeric states in the odd isotopes of Fm and No are discussed.

• Received 6 July 2011

DOI:https://doi.org/10.1103/PhysRevC.84.024324