Odd Co Isotopes in a Unified Vibrational Model

The odd-$A$ Co isotopes are studied in a version of the unified vibrational model which incorporates both anharmonic and quasiparticle effects. With the ${p}_{\frac{1}{2}}$, ${p}_{\frac{3}{2}}$, ${f}_{\frac{5}{2}}$, and ${f}_{\frac{7}{2}}$ orbitals available, quasihole states are coupled to anharmonic vibrations of the corresponding Ni cores. Very good agreement is obtained with the known properties of $^{57\ensuremath{-}59}\mathrm{Co}$ in a one-parameter fit, while the $^{61\ensuremath{-}63}\mathrm{Co}$ calculations are essentially parameter free. The systematics of the energy levels of $^{57\ensuremath{-}63}\mathrm{Co}$ can also be explained well by the model.

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