Simultaneous Measurements of the p+d\to (A=3) +π Reactions
M. Betigeri, J. Bojowald, A. Budzanowski, A . Chatterjee, J. Ernst, L. Freindl, D. Frekers, W. Garske, K. Grewer, A. Hamacher, J. Ilieva, L. Jarczyk, K. Kilian, S. Kliczewski, W. Klimala, D. Kolev, T. Kutsarova, J. Lieb, H. Machner, A. Magiera, H. Nann, L. Pentchev, H. S. Plendl, D. Protic, B. Razen, P. von Rossen, B. J. Roy, R. Siudak, A. Strzalkowski, R. Tsenov, K. Zwoll
Abstract
A stack of annular detectors made of high purity germanium was used to measure simultaneously pd\to {^3H} \pi^+ and pd\to {^3He} \pi^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\to {^3He} \pi^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 \eta={p^{cm}_\pi}/m_\pi yields 2.11\pm0.08 indicating that a deviation from isospin symmetry is very small.