Comparison of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>K</mml:mi></mml:mrow><mml:mrow><mml:mo>±</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mi>N</mml:mi></mml:math>Charge-Exchange Reactions at 8.5 and 13 GeV/<i>c</i>

The cross sections for the line-reversed reaction pairs ${K}^{+}n\ensuremath{\rightarrow}{K}^{0}p$ and ${K}^{\ensuremath{-}}p\ensuremath{\rightarrow}{\overline{K}}^{0}n$, and ${K}^{+}p\ensuremath{\rightarrow}{K}^{0}{\ensuremath{\Delta}}^{++}$ and ${K}^{\ensuremath{-}}n\ensuremath{\rightarrow}{\overline{K}}^{0}{\ensuremath{\Delta}}^{\ensuremath{-}}$ have been determined with high statistics and good relative normalization at 8.36 and 12.8 GeV/c in a spectrometer experiment at Stanford Linear Accelerator Center. The cross sections for the ${K}^{+}$-induced reactions are larger than for the ${K}^{\ensuremath{-}}$, contrary to the expectations of weakly-exchange-degenerate Regge-pole models. The ratio of the reaction cross sections is about the same as at lower energies and shows little change with momentum transfer.