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Abstract
A neutron polarization analyser is described in which the direction dependence of the scintillation pulse shape discrimination (PSD) properties of an anthracene crystal provide the basis for observing the left-right asymmetry of recoil protons associated with the n-p scattering of monoenergetic neutrons within the crystal. The polarimeter consists of a single anthracene crystal mounted on a magnetically shielded photomultiplier tube which is fitted with a PSD circuit. The pulse height and PSD outputs from the photomultiplier are analysed in two parameter mode and a set of observations consisting of a pair of two-parameter spectra leads to a measurement of the recoil proton asymmetry as a function of recoil angle. The polarization in n-p scattering is then deduced as a function of centre-of-mass scattering angle θ cm for values of θ cm in the range 50°–180°.
Published Version
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