Study of Hyperon Production in Nuclei by means of Neutral Kaon Measurements

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This research aims at investigating1 hyperon production mechanism by means of measuring the neutral kaon,2 the role of S =-1 hyperon in the nucleus3 hyperon-nucleon interaction through the structures of hypernuclei.We focused on the photo-production of the neutral kaons at the threshold energy region. The measurement of the neutral kaon photo-production channel gives an important key in understanding the strangeness production mechanism by the electromagnetic interaction, since it has smaller number of terms to be considered than charged-kaon production due to the lack of charge.After design and examinations of the neutral kaon spectrometer, we concluded that the TAGX spectrometer at INS-ES is the best one for the measurement of photo-induced neutral kaons. Therefore, after shutdown of INS-ES, the TAGX spectrometer system was moved to Tohoku University in 1998.We proposed the experimental proposal "Quasi-Free Photoproduction of Neutral Kaon on ^<12>C near Threhold Region" at 1.2 GeV STB ring to Laboratory Nuclear Science (LNS), Tohoku University, as a first step of a series experiments on neural kaon photoproduction.In 2000, the preparations of the laboratory equipment such as a magnet excitation test and data acquisition system proceeded as well as the detector tests. The drift chambers, which are main detectors in the spectrometer, were tested by cosmic rays and confirmed that they have good enough performance.