Forward-backward multiplicity correlations of target fragments in nucleus-emulsion collisions at a few hundred MeV/u  

作　　者：张东海 陈艳玲 王国蓉 李王东 王青 姚继杰 周建国 李蓉 李俊生 李惠玲 

机构地区：[1]Institute of Modern Physics,Shanxi Normal University

出　　处：《Chinese Physics C》2015年第1期19-30,共12页中国物理C（英文版）

基　　金：Supported by National Science Foundation of China(11075100);Natural Science Foundation of Shanxi Province,China(20110110012);Shanxi Provincial Foundation for Returned Overseas Chinese Scholars,China(2011-058)

摘　　要：The forward-backward multiplicity and correlations of a target evaporated fragment （black track particle） and target recoiled proton （grey track particle） emitted from 150 A MeV 4He, 290 A MeV ^12C, 400 A MeV ^12C, 400 A MeV ^20Ne and 500 A MeV ^56Fe induced different types of nuclear emulsion target interactions are investigated. It is found that the forward and backward averaged multiplicity of a grey, black and heavily ionized track particle increases with the increase of the target size. The averaged multiplicity of a forward black track particle, backward black track particle, and backward grey track particle do not depend on the projectile size and energy, but the averaged multiplicity of a forward grey track particle increases with an increase of projectile size and energy. The backward grey track particle multiplicity distribution follows an exponential decay law and the decay constant decreases with an increase of target size. The backward-forward multiplicity correlations follow linear law which is independent of the projectile size and energy, and the saturation effect is observed in some heavy target data sets.The forward-backward multiplicity and correlations of a target evaporated fragment （black track particle） and target recoiled proton （grey track particle） emitted from 150 A MeV 4He, 290 A MeV ^12C, 400 A MeV ^12C, 400 A MeV ^20Ne and 500 A MeV ^56Fe induced different types of nuclear emulsion target interactions are investigated. It is found that the forward and backward averaged multiplicity of a grey, black and heavily ionized track particle increases with the increase of the target size. The averaged multiplicity of a forward black track particle, backward black track particle, and backward grey track particle do not depend on the projectile size and energy, but the averaged multiplicity of a forward grey track particle increases with an increase of projectile size and energy. The backward grey track particle multiplicity distribution follows an exponential decay law and the decay constant decreases with an increase of target size. The backward-forward multiplicity correlations follow linear law which is independent of the projectile size and energy, and the saturation effect is observed in some heavy target data sets.

关 键 词：heavy-ion collisions target fragmentation MULTIPLICITY correlation nuclear emulsion 

分 类 号：O572.2[理学—粒子物理与原子核物理]