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 ¹⁷⁶Hf, ¹⁷⁸Hf, and ¹⁷⁴Yb. 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.[NUCLEAR STRUCTURE ¹⁷⁴Hf, ¹⁷⁶Hf, ¹⁷⁸Hf, ¹⁸⁰Hf, ¹⁷⁴Yb; calculated configuration mixing higher K bands, fit energy splittings, Gallagher-Moszkowski pairs, n-p force deduced.]