Photoproduction of neutral kaons on the liquid deuterium target in the threshold region

摘要

The photoproduction process of neutral kaons on a liquid deuterium target isinvestigated near the threshold region, Egamma = 0.8-1.1 GeV. K0 events arereconstructed from positive and negative pions, and differential cross sectionsare derived. Experimental momentum spectra are compared with those calculatedin the spectator model using a realistic deuteron wave function. Elementaryamplitudes as given by recent isobar models and a simple phenomenological modelare used to study the effect of the new data on the angular behavior of theelementary cross section. The data favor a backward-peaked angular distributionof the elementary n(gamma,K0)Lambda process, which provides additionalconstraints on current models of kaon photoproduction. The present studydemonstrates that the n(gamma,K0)Lambda reaction can provide key information onthe mechanism of the photoproduction of strangeness.