Polarization and Differential Cross Sections inn−dScattering

Abstract

The polarization and differential cross section for neutrons scattered from deuterium are measured at five laboratory angles (22°, 48°, 80°, 100°, and 150°) for incident neutron energies of 0.5, 1.0, and 1.95 MeV. The neutrons were produced in the ${\mathrm{Li}}^7(p, n){\mathrm{Be}}^7$ reaction. The partially polarized beam emitted at 51° was used first directly and then with the spins precessed through 180° in the transverse field of an electromagnet in order to determine the asymmetry in the intensities after scattering from deuterium. The results at 0.5 and 1.0 MeV give zero polarization within 2-3%. At 1.95 MeV small positive polarizations up to 4% are observed. The differential cross sections measured are more peaked at large angles than in earlier work. These data are compared with earlier calculations and a new phase-shift analysis of these measurements is made.