Abstract
A polarized neutron beam has been used to determine the differential cross section and the analyzing power for neutron-proton capture at laboratory angles of 55°, 90° and 125° and neutron energies from 19 to 50 MeV. Capture photons were identified by measuring the time-of-flight and employing pulse-shape discrimination in the NaI detectors. Multiple scattering effects in the NE213 target were studied. The differential cross sections and analyzing powers are compared to modern nucleon-nucleon potential calculations including meson-exchange currents.
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