The T matrix of a general deuteron breakup reaction induced by a low energy neutron is derived from the solution of the Faddeev equation with a realistic two·body local potential. The T matrix is represented.as the sum of a final state interaction and a quasi·free scattering terms. The energy spectra of proton in the reaction D(n, p)2n at the incident neutron energy 14.1 MeV are investigated by the use of the Argonne V14 and the Paris potentials. It is verified that the theoretical final state

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... nteraction peak at the forward laboratory angle 4.0 0 depends on the scattering length ann of two-body interaction. In general, the energy spectrum of proton in the reaction D(n, p)2n is represented as the sum of the final spin singlet state and the final spin triplet states of interacting neutron pair.