Scattering of 187-Mev Negative Pions by Hydrogen

The differential cross sections for scattering of 187-Mev negative pions in hydrogen have been observed at six angles. The scattering is well represented by the angular distributions in the barycentric system: ${\pi }^{-}+p\to {\pi }^{-}+p:\frac{d\sigma }{d\omega }=0.81\mathrm{}\pm 0.13+(0.35\pm 0.20)cos\chi +(3.08\mathrm{}\pm 0.38){cos}^2\chi \times {10}^{-27\mathrm{}}$ ${\mathrm{cm}}^2$/sterad, ${\pi }^{-}+p\to {\pi }^0+n:\frac{d\sigma }{d\omega }=1.46\mathrm{}\pm 0.24-(0.16\pm 0.30)cos\chi +(5.63\mathrm{}\pm 0.88){cos}^2\chi \times {10}^{-27\mathrm{}}$ ${\mathrm{cm}}^2$/sterad. A transmission measurement of the total cross section gave 63.5±1.6×${10}^{-27\mathrm{}}$ ${\mathrm{cm}}^2$. An analysis of these data in terms of phase shifts is discussed.