Performance of the liquid xenon detector for the MEG experiment

A 900-l liquid xenon (LXe) detector was constructed for the MEG experiment to look for μ+→e+γμ+→e+γ. With proper calibration and monitoring the detector was successfully operated during the first physics data taking for three months in 2008. We evaluated the performance of the LXe detector around the signal-γsignal-γ energy of 52.8 MeV by using 54.9-MeV photons obtained from π0π0 decays.