Inelastic Scattering of Thermal Neutrons by Paramagnetic Ions

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For the magnetic scattering of thermal neutrons by paramagnetic ions with discrete energy levels, Trammell’s theory is extended to include the inelastic scattering. And the scattering cross section of Eu³⁺, Sm³⁺, Co²⁺ in oxide and fluoride and Fe²⁺ in oxide are estimated. In these ions, the cross sections appreciably include the inelastic parts, and depend on the temperature and the energy of the incident neutrons, that is, the cross sections suddenly increase when the energy of the neutron exceeds the level separations.