Study on origins of cosmic rays with energies above 10^<16>eV

这项研究的目的是确定能量在10^&lt；16&gt；ev以上的初级宇宙线的化学成分。观测地点位于玻利维亚查卡尔塔亚山的宇宙线物理实验室。这个实验室位于海拔5200米，是世界上最高的宇宙线观测点。在这项研究中，我们测量了宇宙线空气簇射的等强度曲线。高空实验使我们能够在更大的大气深度获得曲线。主要成分深刻地反映了这些曲线的特征。将观测到的曲线与蒙特卡罗模拟得到的曲线进行比较，得出结果。在本研究中，我们开始安装新的空气簇射阵列，并于2006年底完成。然而，我们花了大约半年的时间通过回收的信号电缆来减少诱导的噪音，这些电缆在以前的空气簇射阵列中使用。从现在开始，我们至少观察五年以上的空气簇射，然后得出最终结果。

The purpose of this research is to determine the chemical composition of primary cosmic rays with energies above 10^<16>eV. The observation site is at the laboratory for cosmic ray physics at mount Chacaltaya in Bolivia. This laboratory is situated at 5,200m above the sea level, and then this is the world highest one among the cosmic ray observation sites. In this study we measure equi-intensity curves of cosmic ray air showers. A high altitude experiment enables us to get the curves in wider atmospheric depth. The primary composition reflects deeply on the features of these curves. So that the observed curves are compared with those obtained with a Monte Carlo simulations and then we derive the result.For this study we started to install a new air shower array and finished at the end of 2006. However it took about a half year more for us to reduce the induced noises through the recycled signal cables, which were used at the prior air shower array.From now we observe air showers at least for more five years, and then the final result is obtained.