Simultaneous Measurements of the $p+d\to (A=3)+\ddot{I}€$ Reactions

Abstract

A stack of annular detectors made of high purity germanium was used to measure simultaneously $pd\to {}^{3}H\ddot{I}{€}^{+}$ and $pd\to {}^{3}He\ddot{I}{€}^0$ 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 $pd\to {}^{3}He\ddot{I}{€}^0$ 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 $\hat{I}\cdot =p_{\ddot{I}}^{cm}€/m_{\ddot{I}}€$ yields $2.11\pm 0.08$ indicating that a deviation from isospin symmetry is very small.

23 pages, latex, 15 figures