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

本研究的目的是通过测量中性K介子来阐明1超子产生机制，2通过超核结构来研究S =-1超子在核-核子相互作用中的作用，3重点研究了阈能区中性K介子的光生。中性K介子光生通道的测量是理解电磁相互作用奇异值产生机制的一个重要关键，因为它与带电K介子光生通道相比，由于缺少电荷，所需考虑的项数较少。我们认为INS-ES的TAGX谱仪是测量光致中性K ~+的最佳仪器。因此，在INS-ES停止运行后，TAGX谱仪系统于1998年被转移到东北大学。作为神经<12>K介子光生系列实验的第一步，我们向东北大学核科学实验室（LNS）提出了在1.2GeV STB环上的“临界区附近中性K介子的准自由光生”实验方案。进行了实验室设备的准备工作，如磁铁励磁试验和数据采集系统以及探测器试验。漂移室是谱仪的主要探测器，经过宇宙射线的测试，证明它们具有足够好的性能。

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.