Abstract
The cross section for critical scattering of slow neutrons by iron near the Curie temperature is studied. The parameters κ1, μ1, A introduced in the Van Hove's theory are measured for various temperatures. For instance, at a temperature of 826° C ( T− T c = 56°) it is found: κ 2 1 = 1·66 × 10 -2( A ̊ ) -2, 2mΛ h ̵ =3.5. The results for κ1 and μ1 disagree with the results of other authors. They are consistent with magnetic data. The results are compared with different theoretical estimations. The best fit is obtained with a model in which the second neighbours of an iron atom are magnetically active and in which the magnetic electrons are described by the Heisenberg model.
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