Study of phase transition of quark matter and heavy flavour production at CERN

将乳剂-计数器混合装置置于高能离子束下，研究高能离子-核中心碰撞中夸克物质的相变。迄今为止，进行了200 GeV ^<16>O, ^<32>S和200 GeV/c质子束的辐照。利用名古屋大学研制的自动测量显微镜系统，对核乳剂靶中记录的事件进行了分析。1989年1月9日至14日，在名古屋举行了欧洲和日本合作小组会议，总结了目前的合作成果。正在准备发表五篇论文，其中一篇题为“高能^<16> o -乳剂中心相互作用中粲粒子的产生”。合作会议还讨论了未来研究铅等更重离子中心碰撞的计划。

The emulsion-counter hybrid apparatus was exposed to high energy ion beams at CERN to study phase transition of quark matter which was expected to occur in the high energy ion-nucleus central collisions. Till now, the exposures to 200 GeV ^<16>O, ^<32>S, and 200 GeV/c proton beams were carried out.Analysis of the events recorded in the nuclear emulsion targets have been carried out using an automated measuring microscope system which was developed in Nagoya University. During January 9 - 14, 1989, European and Japanese collaboration group meet-ing was held at Nagoya to summarize the current collaboration results.Publication of five papers, including the one titled "The production of charmed particles in high-energy ^<16>O-emulsion central interactions ", is being prepared. A future plan to study central collisions of much heavier ions such as Pb was also discussed in the collaboration meeting.