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

本研究旨在通过测量中性介子来研究超子的产生机制；2通过超核结构研究S =-1超子在原子核中的作用；3通过超核结构研究超子-核子相互作用。我们重点研究了阈能区中性介子的光产生。中性介子光产生通道的测量为理解电磁相互作用的奇异性产生机制提供了重要的关键，因为由于缺乏电荷，它比带电介子产生需要考虑的项数更少。通过对中性介子谱仪的设计和测试，我们认为INS-ES的TAGX谱仪是测量光致中性介子的最佳仪器。因此，在INS-ES关闭后，TAGX光谱仪系统于1998年搬到了东北大学。我们在1.2 GeV STB环上向东北大学实验室核科学（LNS）提出了“中性Kaon在^<12>C附近阈值区域的准自由光生产”的实验建议，作为神经Kaon光生产系列实验的第一步。2000年，进行了磁感应试验和数据采集系统等实验室设备的准备工作，并进行了探测器试验。漂移室是光谱仪的主要探测器，经过宇宙射线测试，证实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.