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

查卡尔塔亚山观测到的宇宙伽马射线和核相互作用与空气簇射的研究

• 批准号: 63043010
• 负责人: MATANO Tsuneo
• 金额: $ 1.22万
• 依托单位: Saitama University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Overseas Scientific Research
• 财政年份: 1987
• 资助国家: 日本
• 起止时间: 1987 至 1988
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-63043010/
• 关键词: Hadron; Air shower; Gamma ray; Emulsion; エマルション; チャカルタヤ

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.

我们正在观测10^ eV以上的无强子空气簇射<14>，以便从点源和扩散的伽马射线中寻找伽马射线。本文对各种点源（ScoX-1.VelaX-1.SS433.V1223SGR.SN1987a等）方向的无强子空气簇射进行了位相分析。1986年2月至1987年3月在查卡尔塔亚山观测，我们没有发现任何显着的过剩，这些来源。然而.我们在1986年5月下旬发现了ScoX-1的短周期过剩。根据相位分布的X^2检验。不均匀性的概率为7.05 × 10 ~（-1）<-5>。对弥散γ射线的初步研究表明，来自星系中心的无强子空气簇射相对于其它方向的空气簇射约多出3%，为了与我们用混合方法（空气簇射阵列+乳胶室）观测到的乳胶数据进行比较，用三维MonteCarlo模拟计算了空气簇射核中能量大于1 TeV的强子。这些计算是用CKP模型的高多重数模型和加速器数据外推的模型进行的。我们对高能强子的能谱和ER分布的实验结果与目前的计算结果进行了比较。