Research in the domain of few-nucleon systems concerns reactions involvinga small number of nucleons in which observables can be compareddirectly to exact computational methods — rigorous solutions of the Faddeevequations. The investigations of such systems reveal existence of variousdynamical ingredients such as the three-nucleon force, the Coulombforce or relativistic effects. A large set of the cross-section data of the1H(d; pp)n breakup reaction obtained at energy of 130 MeV was used totrace the Coulomb force effects. Comparisons of the cross-section data withthe predictions using the realistic Argonne 18 potential are presented. Thenew set of invariants was introduced to describe the process with threenucleons in the final state.
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