2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/192283We reexamine the long-standing problem of the microscopic derivation of a particle-core coupling model. We base our research on the Klein-Kerman approach, as amended by Dönau and Frauendorf. We describe the formalism to calculate energy spectra and transition strengths in some detail. We apply our formalism to the rotational nuclei $^{155,157}$Gd, where recent experimental data requires an explanation. We find no clear evidence of a need for Coriolis attenuation.27 pages, 13 uuencoded postscript figures. Uses epsf.styNuclear Theorytext