Keywords: 
• 重电离粒子 /
• 多重数 /
• 平均多重数 /
• 关联

Abstract: The forward-backward multiplicity correlation of heavily ionized particles produced in 12C-emulsion interactions at 400 AMeV is investigated.The heavy ionized particles,come from the target fragments,are divided into grey track particle and black track particle.The experimental results can be well explained by the geometry model of the nucleus-nucleus collisions.The emission of grey track particles in forward and backward hemisphere is not isotropic,but the emission of black track particle is almost isotropic.The averaged multiplicity of grey track particles and black track particles in forward and backward hemisphere linearly depend on the number of heavily ionized particle nh,the correlation strength in forward hemisphere is greater than that in backward hemisphere,but the dependence of grey track particle in backward hemisphere on the number of heavily ionized particle nh shows the saturation because of the intranuclar cascade effect is influenced by target size.The characteristics of multiplicity correlations can be well explained by the participant-spectator model based on the colliding geometrical picture and the cascade evaporation model of high energy nucleus-nucleus collisions.