Polarization of the Deuteron in the Reactionp+p→π++d

Using 340-Mev unpolarized protons, the polarization of deuterons produced at a center-of-mass angle of 115° in the $p+p\to {\pi }^{+}+d$ reaction has been measured. The deuterons were detected in coincidence with the mesons and were analyzed by scattering from a carbon target at 24°. In conjunction with previous experiments on the reaction, this measurement completes the specification of the phenomenological parameters of Rosenfeld and Gell-Mann and Watson. Specifically it permits the determination of the relative phases of the several modes of meson production, which in turn are related to the $p-p$ phase shifts at this energy.