Inclusive measurement of strangeness photo-production and N$\Delta$ resonance state search on a deuterium target

Photo-production of strangeness has been mainly studied by the reaction of charged channels ( e.g.: $\gamma+p\to K^{+} + \Lambda$). However, photo-production of $K^0$ meson through neutral channel ($\gamma+n \to K^0+\Lambda$) is not sufficiently studied due to experimental difficulties. The most reasonable way to study the reaction is to use a deuteron target as a quasi free neutron target since a lone neutron target is impractical. The cross section measurement would be good benchmark for isobar models. Thus, we have been investigated strangeness photo-production using a deuterium target with Neutral Kaon Spectrometer2 (NKS2) at the Research Center for Electron Photon Science (ELPH), Tohoku University, Japan. NKS2 is a magnetic spectrometer with a large solid angle (25\% of total) and multi charged particle detection capability. In the experiment, a few MHz tagged photon beam at energies ranging from 0.8 to 1.1 GeV was bombarded to the liquid deuterium target (520 mg/cm${}^{2}$). Mass of $K^0$ and $\Lambda$ were used as sources of momentum calibration of NKS2 in the analysis. In the presentation, I will report recent result about $N\Delta$ dibaryon candidate via the $\gamma + d \to d + \pi^{+} +\pi^{-}$ reaction, and the cross-section of $\Lambda$ and $K^0$ photo-production.