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The spin-spin dependence of the total cross section of ' Co for neutrons was measured at seven energies. A polarized neutron beam with energies of 8.2, 11.1, 12.8, and 14.1 MeV from the 'H{d, n)'He reaction and of 23.0, 27.5, and 30.6 MeV from the 'H(d, n)'He reaction was transmitted through a cobalt sample. The cobalt target was cooled with a 'He-'He dilution refrigerator and polarized in a magnetic field. The transmission rates of the neutrons were compared for parallel and antiparallel spin orientations. The values obtained for the spin-spin cross section are much smaller than those found below 3 MeV. Deduced strengths of spin-spin terms in the optical model are in the range of 1 MeV. This is of the same order of magnitude as estimated from microscopic calculations.NUCLEAR REACTIONS 5 Co +~, E"=S -31 MeV; measured spin-spin dependent transmission; deduced o";deduced optical model spin-spin terms.

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