Comparison ofK±NCharge-Exchange Reactions at 8.5 and 13 GeV/c

The cross sections for the line-reversed reaction pairs $K^{+}n\to K^{0}p$ and $K^{-}p\to {\overline{K}}^{0}n$, and $K^{+}p\to K^0{\Delta }^{++}$ and $K^{-}n\to {\overline{K}}^0{\Delta }^{-}$ 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 $K^{-}$, 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.