The optimal parameters of the Nilsson single particle potential in order to reproduce the experimental radii of the ground states of nuclei and the K-isomers Lu, Hf, Ta were found. The isospin dependence of harmonic oscillator frequency and the new parameters set of the Seo correction term in the single-particle potential make able to use the macroscopic--microscopic model with free quasiparticle BCS pairing approximation to describe the properties of nuclear ground and rotational K-isomeric states.

PACS numbers: 21.24.Dr, 21.30.Fe, 21.60.Jz