A search for Cosmic High Energy Neutron

利用光学技术研制了用于寻找高能宇宙中子的高分辨率宇宙射线探测器。制作了由8个512像素多阳极光电倍增管组成的高分辨率相机及数据采集电子器件。它被安装在犹他大学提供的固定定向反射镜系统的靶面上。为了获得对高能宇宙射线的最佳灵敏度，望远镜的俯仰角为19‰。观察时间为-100小时。Nd: YAG激光监测系统由美国犹他大学的合作者操作。利用该系统，我们可以校准探测器并监测大气状况。通过100小时的观测，我们探测到了100张宇宙射线雨的图像。其中，10幅星雨图像被识别为能量大于3*10^<18>eV，撞击参数距离探测器10Km-30Km的星雨图像。通过数据分析，我们证明了淋浴探测器平面的几何形状可以确定，精度为-0.03‰。这个角度分辨率比目前所达到的分辨率要好得多。我们建立了高精度探测宇宙射线的实验方法。

The high resolution cosmic ray detector using optical tequniques were developped to search for high energy cosmic neutrons.The high resolution camera consisiting of eight multi anode photomultipliers of 512 pixels, and the data aquisition electronics were made. It was mounted on the fucul plane of the fixed directional mirror systems provided by University of Utah. The telesope was directed at elevation angle of 19ﾟ to get the best sensitivity for the high energy cosmic rays. The observation were carried out for -100hrs.The monitoring system with Nd : YAG laser were operated by the collaborators of University of Utah. Using this system, we could calibrate our detector and monitor the atmospheric condition.With 100hr observation, we have detected 100 cosmic ray shower images. Among them, 10 shower images were identified as showers with energy of greater than 3*10^<18>eV,and with the impact parameter of 10Km-30Km from detector. Through the data anlaysis, we have demonstrated that the geometry of the shower detector plane can be determined with an acuracy of -0.03ﾟ. This angular resolution is much better than the resolution achieved so far. We have established the experimental method to detect cosmic rays with the high accuracy.