Abstract
The differential cross sections for ${\ensuremath{\pi}}^{\ensuremath{-}}p$ charge exchange at 180\ifmmode^\circ\else\textdegree\fi{} are given as a function of ${\ensuremath{\pi}}^{\ensuremath{-}}$ momentum from 1.8 to $6.0 \frac{\mathrm{GeV}}{c}$. Below $4 \frac{\mathrm{GeV}}{c}$ there is a resonancelike structure. Above $4 \frac{\mathrm{GeV}}{c}$ the data are in excellent agreement with a smooth exponential drop. A modification of the Igi model gives a good fit to the data. The momentum dependence of the moduli of the isospin-\textonehalf{} and $\frac{3}{2}$ amplitudes and their relative phase is presented.
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