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It is shown that the neutron paramagnetic scattering from an Ising system can, unlike the Heisenberg case, be solved exactly at limitingly high temperatures. The energy distribution of the scattering consists of a number of discrete levels, the envelope of which is close to Gaussian in form. The solution is given for a particular model comprising a simple cubic lattice with nearest-neighbour interactions and spin 5/2 ions. A comparison is made between the second and fourth moments of the distribution and the known moments for the Heisenberg system.
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Collins et al. (1967) studied this question.
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