Cross section of neutrons from the H 2 ( n , 2 n ) reaction at E n = 15 MeV

The double-differential cross section of the deuteron breakup reaction $^{2}\mathrm{H}(n,2n$) has been studied experimentally with a neutron beam energy of 15 MeV. Special attention has been devoted to estimation of background condition and multiple scattering effect in the scattering sample. Experimental data have been compared with models based on phase-space approximation used in the ENDF/B-VIII.0 data library and in the MCNP neutron transport code, as well as with rigorous model based on Faddeev equations used for cross section evaluations in JENDL data library. It was found that experimental data are better reproduced by Faddeev model, however, the model overestimates data in the low-energy region of the neutron spectrum ($l4$ MeV).