Double Transmission and Depolarization of Neutrons

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Abstract
Slow neutrons from the chain reacting pile, polarized by passage through highly magnetized iron, have been analyzed by transmission through additional iron (the "double transmission" effect). The large double transmission effects expected from the polarization cross section of iron were obtained only when the magnetic field between polarizer and analyzer was adjusted carefully to obtain non-adiabatic transitions of the neutrons relative to the field. The general methods developed have been used to measure the change in polarization of a neutron beam with passage through unmagnetized iron. The rate of depolarization is a measure of the domain size in the iron and domain sizes have been measured in this way for a number of Armco iron samples of different metallurgical treatment.