Kaon photoproduction on the deuteron at Sendai

¹ Department of Physics, Tohoku University, Sendai, Miyagi 980-8578, Japan
² Nuclear Physics Institute, 25068, Řež Czech Republic
³ School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
⁴ Laboratory of Nuclear Science, Tohoku University, Sendai, Miyagi 982-0826, Japan
⁵ Department of Electrical Engineering, Ichinoseki National College of Technology, Ichinoseki, Iwate 021-8511, Japan
⁶ Department of Electrical and Electric Engineering, Akita University, Akita, Akita 010-8502, Japan

^a e-mail: kenta-f@lambda.phys.tohoku.ac.jp

Abstract

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). K⁰ 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 K⁰ momentum spectra were in agreement with the previous results within statistical errors. The angular distribution of the γn → K⁰Λ 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.