Kaon photoproduction on the deuteron at Sendai

The photoproduction of K⁰ and Λ on the deuteron was measured in order to investigate the γn → K⁰Λ reaction process near the threshold (E_γ = 0.8-1.1 GeV). K ⁰ and Λ events were clearly seen in the π⁺π ^- and the pπ^- invariant mass spectra, respectively. The momentum spectra of the γd → K⁰X and the γd → ΛX reactions were derived. Additionally, the energy dependence of the integral cross section for the Λ production was also obtained. The K ⁰ momentum spectra were in agreement with the previous results within statistical errors. The angular distribution of the γn → K ⁰Λ reaction in the center of mass system was extracted and it had the backward distribution. The total cross section of the γn → K⁰Λ reaction, which was estimated by subtracting the contribution of K⁺Λ process from the Λ production on the deuteron, was almost the same as that of the γp → K ⁺Λ.