Abstract
Calculation of the excitation functions and isomeric cross section ratio of ${}^{58}\mathrm{Ni}{(n,p)}^{58}{\mathrm{Co}}^{m,g}$ reactions has been carried out using Hauser-Feshbach and preequilibrium nuclear reaction model codes in the 1--20 MeV energy range, and compared with measurements and previous calculations. The structure in the isomeric cross section ratio curve in the low-energy region has been investigated. The anomaly of the branching ratio of the 53 keV ${(4}^{+})$ state to the isomeric states has been resolved by using more precise formalism of the $\ensuremath{\gamma}$-ray transition probabilities available in the literature for the continuum and discrete levels.
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