[en] Since greater number of hypernuclei are produced by the stopped K^- method, it is coming to be possible to systematically study γ ray spectroscopy of hypernuclei that has been difficult in the experiments observed by using (π⁺, K⁺) or (K^-, π^-) reactions up to now. As one of the advantages of the increased γ spectroscopy of hypernuclei, it is expected to accumulate enough data of ΛN interactions of different hypernuclei to discuss and understand the ΛN interaction systematically. It is also expected to extend the study toward three-body force due to strong ΛN interaction which has been suggested from the results up to the present. One more topic expected is the study of the charge symmetry breaking (CSB) of the ΛN interaction. Based on those scientific interests, E509 experiment was performed on K5 beam line at KEK-PS to establish the new methodology of hypernuclei spectroscopy to observe many hypernuclei γ rays with the combination of the stopped K^- and germanium detector. With a rather simple set up, about 9-10x10³ stopped K^- trigger rate per one spill (4s) was obtained and it is estimated that about 70% of them are the events of K^- stopped in the target. About 3.6x10⁸ K^- were stopped in natural Li, ¹⁰B and ¹¹B, respectively and 1x10⁸ in the ⁹Be and C (active target with plastics scintillator) targets. The γ rays were measured with a Hyperball composed by 14 germanium detectors each of which is equipped with BGO active shield. Sensitivity better than 4x10^-4 per single γ is estimated for γ without Doppler shift and about 10^-3 for γ with Doppler shift. Simultaneous γ ^-γ measurement is also possible owing to the good statistics. The method to identify γ ray peak is discussed. The analysis of the experimental results is under way. It is considered to measure heavier hypernuclei in the future. (S. Funahashi)