Interaction ofK+Mesons with Protons

The total $K^{+}-p$ cross section was measured at the three $K^{+}$-meson energies 175±25, 225±25, and 275±25 Mev, and the differential scattering cross section was measured at 225 Mev. The $K^{+}-p$ nuclear force was shown to be repulsive, from the observed constructive interference with Coulomb scattering. The differential cross section was otherwise isotropic and could arise from either pure $S$-wave or pure $P$-wave scattering.