Pion momentum spectra in a nuclear charge exchange reaction Mg(t, 3 He)

The charge exchange reaction Mg(t, 3 He) was investigated in an experiment using a streamer chamber. The branching ratios of the reaction channels (topologies) were obtained. The experimental momentum spectrum for pions was compared with the calculated one, and only 50% of pions were shown to be emitted by the delta isobars produced on a quasi-free nucleon in the target nucleus. It was also found that the mass of delta incorporated in the nucleus was reduced by 30-50 MeV in comparison with a free delta. 19refs., 4 figs., 1 tab