JOINT EMULSION CHAMBER EXPERIMENT AT PAMIR

1958年9月，与苏联宇宙线研究人员合作，在帕米尔高原（海拔4,300米）建造了一个巨大的乳胶室。该室为两层结构，上（γ块）室和下（强子块）室，中间有60厘米的碳靶，面积扩大170平方米。感光材料（X射线胶片和核乳胶板）在曝光约两年后于1960年10月送回日本。感光材料的加工已顺利完成，超高能宇宙线族的探测和测量工作刚刚开始，以获得<10^（16）> eV以上粒子相互作用特征的新信息，值得注意的是，发现了一个中心有巨大晕的极高能宇宙线族，观测总能量大于25，初步分析表明，粒子产生的本质不是普通类型的多粒子产生的外推，而需要引入新的相互作用。发现了一些观测能量大于1, 000 TeV的高能族，它们将为高能粒子相互作用的特征提供重要的信息。

A huge emulsion chamber was constructed on Sep. 1958 at Pamir plateau(4,300 m) by the collaboration with Soviet Cosmic-Ray researchers. The Chamber is of two storey structure, upper(Gamma-block) and lower (Hadron blocks) chambers with 60 cm of carbon target in between, and the area is extended 170 <m^2> .Photo sensitive materials (X-ray-films and nuclear emulsion plates) were sent back to Japan on October 1960 after about two years exposures. The processing of photo-sensitive materials was completed successfully, and the detection and measurement of super high energy cosmic-ray families are just started in order to get new informations on the characteristics of particle interactions above <10^(16)> eV regions.It is remarkable that an extremely high energy cosmic-ray families with huge halo in the center was found with total observed energy greater than 25,000 TeV and the preliminary analysis tells the nature of particle production are not on the extrapolation of ordinary type of multiple particle production and requires introduction of new type of interaction. There are found a number of high energy families greater than 1,000 TeV of observed energies and they will provide important informations on the characteristics of high energy particle interactions.