Neutron-deuteron scattering and the three-nucleon force

Differential cross sections for neutron-deuteron elastic scattering were measured at six angles between 65 and 130 degrees (center-of-mass) for incident neutron energies in the range 140 to 240 MeV. A liquid deuterium target was exposed to the pulsed neutron beam provided by the LANSCE/WNR facility at the Los Alamos National Laboratory. Scattered neutrons and recoil deuterons were observed in coincidence using time-of-flight techniques and an array of plastic and CsI scintillation detectors. With liquid hydrogen in the target, elastic neutron-proton scattering cross sections were measured to aid in normalization of the neutron-deuteron data. The results will be compared with theoretical predictions including three-nucleon forces and with the results of previous measurements.