Based on the microscopic cranking model, the moment-of-inertia parameter $J_0$ and the force constant $C_{\mathrm{VMI}}$ associated with the variable-moment-of-inertia model are calculated microscopically for rare-earth nuclei. Higher-order effects representing quadrupole and hexadecapole centrifugal stretching, proton and neutron Coriolis-antipairing effects, and fourth-order cranking correction are included. The present calculations are able to reproduce the trend and the magnitude of both $J_0$ and $C_{\mathrm{VMI}}$ fairly well with discrepancies ranging from 10 to 40%.

NUCLEAR STRUCTURE Rare-earth even-even nuclei, calculated moment of inertia and force constant. Variable-moment-of-inertia model, cranking model. Coriolis-antipairing effect, fourth-order cranking, centrifugal stretching.

• Received 10 October 1974

DOI:https://doi.org/10.1103/PhysRevC.11.213