Abstract
We investigated the ${}^{2}\mathrm{H}(\stackrel{\ensuremath{\rightarrow}}{p},pp)n$ breakup reaction by measuring an angular distribution of the cross section and analyzing power in the $\mathrm{np}$ final-state interaction (FSI) at ${E}_{\stackrel{\ensuremath{\rightarrow}}{p}}=19\mathrm{MeV}$ as a function of the $\mathrm{np}$ production angle. Kinematically complete measurements at 12 angular settings of detectors have been done. The observables around the exact FSI point were compared with predictions of four modern $\mathrm{NN}$ potentials, calculated for ${}^{2}\mathrm{H}(n,np)n,$ i.e., without inclusion of the Coulomb interaction. The resulting good overall agreement between the data and theory indicates the smallness of three-nucleon force (3NF) effects as well as the insignificance of the Coulomb force for this particular configuration and energy. This conclusion is supported by results of three-nucleon (3N) Faddeev calculations performed with 2\ensuremath{\pi}-exchange Tucson-Melbourne 3NF with cutoff parameter adjusted individually for each $\mathrm{NN}$ interaction to fit the experimental triton binding.
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