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New measurements of the neutron-neutron quasifree scattering cross section inneutron-deuteron breakup at an incident neutron energy of 10.0 MeV arereported. The experiment setup was optimized to evaluate the technique fordetermining the integrated beam-target luminosity in neutron-neutroncoincidence cross-section measurements in neutron-deuteron breakup. Themeasurements were carried out with a systematic uncertainty of $\pm 5.6 \%$.Our data are in agreement with theoretical calculations performed using theCD-Bonn nucleon-nucleon potential in the Faddeev formalism. The measuredintegrated cross section over the quasifree peak is $20.5 \pm 0.5 \text{(stat)}\pm 1.1 \text{(sys)}$ mb/sr$^2$ in comparison with the theory prediction of20.1 mb/sr$^{2}$. These results validate our technique for determining thebeam-target luminosity in neutron-deuteron breakup measurements.

Neutron-neutron quasifree scattering in neutron-deuteron breakup at 10 MeV