STUDY OF COSMIC GAMMA RAYS AND NUCLEAR INTERACTIONS WITH AIR SHOWERS OBSERVED AT MT.CHACALTAYA

我们正在观测10^<14>eV以上的无强子空气阵雨，以搜索来自点源的伽马射线和扩散伽马射线。从不同的点源方向（scox -1. velax -1. ss433 . v1223sgr . sn1987 . a.等）对无强子风淋进行了相位分析。从1986年2月到1987年3月在chacaltaya山观测到的。我们没有发现这些源有明显的过量。然而。我们发现ScoX-1在1986年5月下半月出现了短期过剩。按X^2试验求相位分布。不均匀性的概率为7.05x10^<-5>。漫射伽马射线的初步结果表明，与其他方向相比，来自银河系中心的无强子空气阵雨的过剩量约为3%。采用三维蒙特卡罗模拟方法计算了气淋室核心中能量大于1TeV的强子，并与混合方法（气淋室阵列+乳化液室）观测到的乳化液数据进行了比较。这些计算是通过基于CKP模型的高多重模型和由加速器数据外推的模型来完成的。我们对高能强子的能谱和ER分布的实验结果与目前计算的结果进行了比较。

We are observing the hadronless air showers above 10^<14>eV in order to search gamma-rays from point sources and diffused gamma-rays. phase analysis has been done on hadronless air showers from directions of various point sources(ScoX-1.VelaX-1.SS433.V1223SGR.SN1987a.etc.). observed at Mt.Chacaltaya from 1986 Feb. to 1987 Mar. We could not find any significant excess for these sources. However. we have found a short period excess from ScoX-1 in the latter half of May of 1986. According to the X^2 test for the phase distribution. the probability of the ununiformity is 7.05x10^<-5>. Preliminary results on diffused gamma-rays shows that the excess of hadronless air showers from galactic center is about 3% compared with other directions.Hadrons with energies above 1TeV in air shower cores were caluculated with three-dimensional Monte Carlo simulation in order to compare with our emulsion data observed with the hybrid method(air shower array + emulsion chamber). These caluculations have been done by a high multipicity model according to CKP model and by a model extrapolated from accelerator data. Our experimental results on energy spectrum and ER distributions of high energy hadrons are compared with ones expected from the present calculations.