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The production of polarized neutrons in magnetized iron has been studied, using the intense neutron beams available at the Argonne heavy water pile. The theoretical work of Halpern et al. , used as a guide in the experiments, has been checked in many respects, with the exception that the polarization cross section p has a measured value of 3. 15 barns compared to the theoretical 1 barn. The application of neutron polarization to the measurement of the approach to saturation in ferromagnets is described and preliminary results are reported.
Hughes et al. (Tue,) studied this question.