RING-LIKE EVENT OBSERVED IN SUPERHIGH ENERGY INTERACTION AND PHASE TRANSITION

The kinematical analysis of the ring-like event observed in mountain emulsion chamber shows that this kind of events might relate to the multi-particle production within a narrow rapidity interval of the fragmentation region in the superhigh energy interactions, therefore possibly relate to the phase transition in the nucleus-nucleus interaction. The air cascade showers induced by superhigh energy nucleus-nucleus interactions are simulated by a transition model. Under the condition of the emulsion chamber experiment, the ring-like event is obtained.