K+ n charge exchange near 1 GeV/c☆

We present cross sections and angular distributions for the reaction K+d → Kopp at 865, 970, 1210, 1365 and 1585 MeV/c. Making corrections for deuterium effects, we observe the following features of the elastic charge exchange process K+n → K0p: a) the c.m. angular distribution becomes increasingly peripheral as the momentum increases from 800 to 1600 MeV/c; b) the forward amplitude is largely real. Attempts to describe the data either in terms of a Regge model or in terms of dominance by an elastic P12 isoscalar KN resonance are discussed.