【摘要】 提出了关联度概念，采用粒子群关联函数方法对Bevalac流光室1．2AGeVAr＋BaI2碰撞事件中关联度不同的粒子对集合侧向流的作用进行了研究.研究表明：关联度是描述集合侧向流性质的一个重要参量．少数关联度较大的粒子（或碎片）可以产生集合侧向流效应，但高阶集合流关联却不受其支配，而是关联度不同的多数粒子（或碎片）集体贡献的结果．更多还原

【Abstract】 A concept of copulative degree is Proposed in this Paper.Using the method of particle-group correlation’s unction,the effects of the Particles with different correlative degrees on collective sideway now are studied for 1.2A GeV Ar+ BaI2 collisions at the Bevalac stream chamber.Our studies indicate that correlative degree is an important parameter on describing collective sideward flow Properties. The minority of correlative Particles(or fragmentS) with larger correlative degrees can produce the effect arising from the collective sideward now, but the effect arising from high-order collective flow correlations can not be dominated by these minority of Particles (or ragments).It is results from the collective contribution of the majority of collective particles(or fragments) with various correlative degrees. Received 27 February 1998, Revised 20 July 1998 * Supported by the Youth Science Foundation of Guangxi Province of the People’s Republic of China under contract/Grant No. GSY-9811016更多还原