Proton-neutron final-state interaction in the reaction 1H(d, 2p)n at 12.6 MeV

Abstract

Two-dimensional coincidence spectra of protons from the reaction p+d → p+p+n were measured at a deuteron bombarding energy of 12.6 MeV. The detection angles were selected to favour the (np) final-state interaction (FSI). The regions of the spectra that contain the (np) FSI peak were analysed with the impulse approximation (IA), taking into account spin dependence and antisymmetrization of wave functions. In addition, a modified impulse approximation (MIA) was used to account for the dominant (np) FSI in higher order. To correct for experimental broadening effects the data were simulated with a Monte Carlo program on the basis of the IA, the MIA or a Watson model, that accounts only for the dominant singlet (np) FSI. The comparative analysis of the results shows that the MIA can correct to some extent the predictions of the Watson model for the presence of competing FSI and spectator effects.