Elsevier

Nuclear Physics A

Volume 110, Issue 2, 22 March 1968, Pages 400-416
Nuclear Physics A

Studies of odd-mass Co isotopes in the unified model

https://doi.org/10.1016/0375-9474(68)90549-6Get rights and content

Abstract

An explanation of the properties of the low-lying levels of the odd mass Coisotopes and the interpretation of the (t, α) reactions on the even-mass Ni isotopes are presented on the basis of the intermediate coupling approach of the unified model. It is assumed that a Co isotopes has a structure formed by coupling of a proton hole to the quadrupole vibrations of the corresponding even-mass Ni nucleus. The core states up to three phonons are considered in the calculations. The phonon energy ħω is taken as the energy of the first excited state of the neighbouring Ni isotope. The proton-hole states are assumed to be (1f72)−1, (1d32)−1 and (2s12)−1 The coupling strenght ξ is the only variable parameter which enters into the calculation of the negative-parity states. The energies of states (1d32)−1 and (2s12)−1 with respect to 1f73−1 are treated as the variable parameters in the calculation of the positive-parity levels. The isotopes considered are 57Co, 59Co, 61Co and 63Co. The calculated energy levels, spins and parities, nuclear moments and the transition probabilities are in good agreement with the experimental results. The calculated spectroscopic factors for the 72 −, 12+ and 32+ states agree reasonably well with the experimental results of the (t, α) reactions on the even-mass Ni isotopes.

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