| Sumario: | In order to investigate some approximations involved in the generalized semimicroscopic model (GSMM), a cluster-phonon model is presented in which a hole or two holes and one particle are coupled between them through Q-Q plus pairing interactions, and to the quadrupole vibrations of a doubly even core having a closed shell. Anharmonicities are also included phenomenologically. Matrix elements are computed using graphical methods and nunumerical calculations are performed for Co57 and In115, selected as well known examples of odd-mass nuclei in the 1f72 and 1g92 shells, respectively. A good fit to energy levels is achieved through a reasonable variation of the model parameters, and the predictions of the GSMM about the nature of the low-lying levels in both nuclei are confirmed. The calculated electromagnetic properties and spectroscopic factors compare favorably with experiment except for some discrepancies in In115. NUCLEAR STRUCTURE Co57, In115; calculated levels, J, π, B(E2), B(M1), q, μ, S, b, τ. Cluster-phonon model; 2h-1p excitations, anharmonicities. © 1975 The American Physical Society.
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