Neutral Meson Production inn−pCollisions

Abstract

The angular distribution of neutral pions formed by 400-Mev neutrons in the process $n+p\to d+{\pi }^0$ has been measured using an experimental arrangement in which both of the ${\pi }^0$ decay gamma-rays are detected in coincidence with the deuteron. The results can be described in the center-of-mass system by the function ${cos}^2\theta +0.2\mathrm{}$. The agreement between this distribution and the ${\pi }^{+}$ distribution of the process $p+p\to d+{\pi }^{+}$, which has been measured by Whitehead and Richman and by Durbin, Loar, and Steinberger, gives evidence in support of the hypothesis of charge independence in meson-nucleon interactions.