Simultaneous measurements of the p+d→(A=3)+π reactions

Abstract A stack of annular detectors made of high-purity germanium was used to measure simultaneously pd → 3 H π + and pd → 3 He π 0 differential cross sections at beam momenta of 750 MeV /c , 800 MeV /c , and 850 MeV /c over a large angular range. The extracted total cross sections for the pd → 3 He π 0 reactions bridge a gap between near threshold data and those in the resonance region. The ratio of the cross sections for the two reaction channels taken at the same η=p cm π /m π yields 2.11±0.08 indicating that a deviation from isospin symmetry is very small.