Abstract
Partially polarized 3-MeV neutrons have been scattered from $^{3}\mathrm{He}$ contained in a high-pressure gas scintillation cell. The resulting asymmetry in the elastic scattering was determined for seven scattering angles from 40 to 120\ifmmode^\circ\else\textdegree\fi{} (lab). Time-of-flight techniques and neutron-$\ensuremath{\gamma}$-ray discrimination in the side detectors were used for background reduction. The measured asymmetry is small for angles less than 60\ifmmode^\circ\else\textdegree\fi{} (lab) and reaches a maximum value at approximately 110\ifmmode^\circ\else\textdegree\fi{} (c.m.). The maximum asymmetry determined from the present experiment corresponds to a polarization of +0.50. The differential polarization can be fitted within experimental uncertainties by assuming that $D$-wave effects are negligible. The principal features of the data are qualitatively reproduced by Dodder's reaction-matrix calculations which use the Werntz-Meyerhof level parameters for $^{4}\mathrm{He}$.
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