On the measurement of the nuclear polarization of a low-energy polarized target by observing the EPR line

Abstract The conventional method of measuring the degree of polarization of a nuclear target (by NMR) cannot be applied to a low-energy polarized target because of its necessarily small size. It is shown that, using a new type of EPR measurement, the nuclear polarization can be derived from an expression of the form ΔS = γp , where Δ S denotes the change of the EPR signal, p the nuclear polarization, and γ a factor which depends on the geometrical dimensions and the crystal structure of the target sample and on a characteristic constant of the measuring apparatus. The dependence of γ on these quantities will be discussed in detail.