Abstract
An attempt is made to find a satisfactory explanation for the average spin-spin cross section of $^{59}\mathrm{Co}$ for neutrons between 0.3 and 2.9 MeV. Calculations with an optical model spin-spin potential obviously fail to reproduce these data. A hybrid model is developed containing elements of compound-nucleus formation and of the optical model. Partial waves with orbital momenta up to $l=4$ are taken into account. This model yields a good explanation of the $^{59}\mathrm{Co}$ data. It also agrees with the spin-spin cross section of $^{165}\mathrm{Ho}$, the only other nuclide for which data exist above 0.1 MeV.NUCLEAR REACTIONS Spin-spin interaction model applied to $^{59}\mathrm{Co}$, $^{165}\mathrm{Ho}$.
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