Multiplicity Distribution And Correlation Of Final State Produced Particles In12A Gev~4He Induced Nuclear Emulsion Interactions

Angular distribution, multiplicity distribution, and correlation ofmultiparticle production in~4He-emulsion interactions at12A GeVis investigated in this paper. It is found that: Multiplicity of greytrack particle, black track particle, and heavily ionizing trackparticle is strongly depend of the target size and collision centrality,but shower particle multiplicity is weakly depend of the target size.Emission angle distribution of black track particle is almost thesame in all the direction, but in forward direction is more than inbackward direction, the emission angle distribution of grey trackparticle obeys a power law distribution and the shower particle isdistributed in forward direction. The stronger correlation is foundbetween grey track particle, black track particle and heavilyionizing particle, but the saturation effect is observed in correlationof average multiplicity of black track particle <n_b>and multiplicityof grey track particlen gand heavily ionizing particlen n_h, averagemultiplicity of shower particle<n_s> is weakly depend of themultiplicity of grey track particlen n_g, black track particlenb andheavily ionizing particlenh n_h, and average multiplicity of production increases with increase of shower particlen n_s and then becomessaturated. The increase amplitude of average multiplicity of blacktrack particle and grey track particle emitted in forwardhemisphere which are <n_b~f>and <n_g~f>increases with increase ofthe number of heavily ionizing track particlen his greater than theincrease amplitude of average multiplicity of black track particleand grey track particle emitted in backward hemisphere which are<n_b~B>and <n_g~B>.