JOINT EMULSION CHAMBER EXPERIMENT AT PAMIR

1958年9月，与苏联宇宙射线研究人员合作，在帕米尔高原（4300米）建造了一个巨大的乳化室。该室为两层结构，上（伽马块）和下（强子块）室，中间有60厘米的碳靶，面积扩大170<m^2>。感光材料（X射线胶片和核乳剂板）经过大约两年的曝光后于1960年10月运回日本。光敏材料的加工已顺利完成，超高能宇宙线族的探测和测量刚刚开始，以获得<10^(16)>eV区以上粒子相互作用特征的新信息。值得注意的是，发现了中心巨大光环的极高能宇宙线族，观测总能量超过25,000 TeV，初步分析表明粒子产生的本质不是普通型多粒子的外推。生产并需要引入新型交互。已发现许多观测能量大于1000TeV的高能族，它们将提供有关高能粒子相互作用特征的重要信息。

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.