用蒙特卡罗模拟方法计算EAS阵列的有效探测面积

MONTE-CARLO SIMULATION ON THE ACCEPTANCE OF AN AIR SHOWER ARRAY

本文从EAS横向分布的经验公式NKG结构函数及将平均值由NKG函数给定的Poisson分布用来对探测器实际测量到的粒子数密度进行随机抽样出发,利用蒙特卡罗模拟方法计算了梁王山宇宙线观测站粒子阵列的有效探测面积A_(eff)。由A_(eff)算出的EAS阵列的响应函数与实验观测结果相符合。将本文所得结果用于梁王山宇宙线测站的实验数据的分析,效果良好。

By assuming that (1)the lateral structure of an air shower follows the NKG function and (2)the Poisson distribution can be used to select real detective particle density for each particle density detector, in which the mean value is determined by NKG function (i.e. (1) ),and making use of Monte-Carlo method, the effective area (i.e.acceptance) for the air shower array of Mt. Liang Wang Cosmic ray observation station is simulated numerically. The calculated response function from simulation values of effective area agrees well with the observed results of the EAS array experiment, and it is good to use simulation values of effective area to analyse experimental data of the EAS array. This fact confirms that the simple method of calculating effective area is proper and appicable.