Analyzing power of thep→p→π+dreaction at 375, 450, and 500 MeV incident proton energies

The analyzing power $A_{N0\mathrm{}}$ of the $\overrightarrow{\mathrm{p}}\mathrm{p}\to {\pi }^{+}\mathrm{d}$ reaction was measured to a statistical precision of better than ±0.01 at incident proton beam energies of 375, 450, and 500 MeV, for center-of-mass angles from 20° to 150°. The polarization-dependent differential cross sections were fitted by associated Legendre functions (using published data for the shapes of the unpolarized differential cross sections). The energy dependence of the resulting $b_k^{N0\mathrm{}}$ coefficients were compared with existing data and theoretical expectations.