Abstract
The absolute value of the \(^3\)He polarization is necessary to extract \(^3\)He analyzing powers for p–\(^3\)He elastic scattering. In this work, we used three totally independent methods to evaluate the \(^3\)He polarization. The first method is an adiabatic fast passage (AFP) NMR. The second uses an electron paramagnetic resonance (EPR) of alkali metals. The last one is a breakthrough technique based on neutron transmission to directly measure the \(^3\)He polarization. We describe the two methods (the AFP-NMR and the EPR measurement) in this chapter, and then discuss a polarization gradient between the target chamber and the pumping chamber. The details of the neutron transmission method are described in Chap. 4.
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