  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.

Nuclear Experiment