利用理想高斯源的两粒子关联函数, 对单高斯源和双高斯源的两π介子HBT关联效应进行了研究, 得出了相应的半径参数和λ参数.结果表明, 半径参数主要取决于高能重离子碰撞中多数π介子产生的中间区域; 对产生π介子的边缘区域的空间分布形状不敏感.在边缘区域内产生的π介子主要影响λ参数的变化.π介子源空间分布的非高斯形是导致λ参数减少的一个重要因素.
The HBT radius parameters and the HBT λ-parameters of single Gaussian source and double Gaussian source are investigated by using two-pion correlation function in HBT intensity interferometry. It is indicated that the radius parameter is insensitive to the spatial shape of the edge zone of source and is mainly affected by the size of the central zone of pions emitted in high energy heavy-ion collisions. The pions produced at the edge of source influence the λ parameter. The non-Gaussian form of spatial distribution of source can lead to the decrease of the λ parameters.
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