Nuclear structure of odd-mass Yttrium nuclei is studied within the framework of the interacting boson-fermion model (IBFM) with parameters based on the optimization method. In addition to the energy surfaces, both single particle energies and occupation probabilities have been used as a microscopic input for building the IBFM Hamiltonian. Only three strength parameters for the particle-boson-core coupling are fitted to experimental spectra. The IBFM Hamiltonian is then used to compute the energy spectra and electromagnetic transition rates for selected odd-mass Sr nuclei. A reasonable agreement with the available experimental data is obtained for the considered oddmass nuclei.
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