Configuration mixing of two-quasiparticle states in even-even deformed nuclei

Evidence of configuration mixing of higher-$K$ bands in deformed even nuclei is surveyed. A general formulation for configuration mixing due to a two-body neutron-proton force is developed. A fit to the energy splittings of Gallagher-Moszkowski pairs in odd-odd nuclei is made to obtain an effective Gaussian central force except for the undetermined Wigner component. With this force, off-diagonal band-mixing matrix elements are calculated for various configurations in ${}_{}{}^{176}{}_{}{}^{}\mathrm{Hf}$, ${}_{}{}^{178}{}_{}{}^{}\mathrm{Hf}$, and ${}_{}{}^{174}{}_{}{}^{}\mathrm{Yb}$. By solving BCS equations, the relevant occupation amplitudes are calculated. The effective $n-p$ Wigner force component is fixed to give best over-all agreement to experimental band-mixing information. The resulting force is compared with the Jones, Onishi, Hess, and Sheline central force for deformed nuclei.