高能宇宙线粒子与石蜡核作用的角分布

本文描述一个利用云室研究高能宇宙线粒子与石蜡的核作用中次级粒子角分布的实验。共分析了64个n_s≥4的事例,其平均初能E₀≈70BeV。结果表明,在此能区,次级粒子在CMS中,角分布不是各向同性,而在0°和180°方向呈现极大,且有相当比例(≥20％)事例的角分布形式显示出火球模型给出图象。

ANGULAR DISTRIBUTION OF NUCLEAR INTERACTIONS OF HIGH ENERGY COSMIC RAY PARTICLES WITH PARAFFIN

A cloud chamber experiment is described, in which the angular distribution of secondary particles produced in nuclear interaction by high energy cosmic ray particles with paraffin has been studied. Sixty-four n_s≥4 events with average primary energy of 70 BeV have been analysed. The result shows that, in this energy region, the angular distribution in CMS is not isotropic but possesses maxima in the 0° and 180° directions; furthermore, there is already an appreciable fraction (≥20%) of the events with angular distribution exhibiting the features given by the "fire-ball" model.