相对论重离子碰撞中π源密度分布和小相对动量区域2π干涉学分析

Pion Source Density Distribution and Tow-Pion Interferometry atSmall Relative Momentum in Relativistic Heavy-Ion Collisions

用２π关联函数在小相对动量区域的幂级数展开，得到了不同π源密度分布下源的空间参数、平均半径和均方根半径间关系，与相对论重离子中心碰撞１．８ＡＧｅＶＡｒ＋Ｐｂ的实验结果一致。给出了上述反应中π源的平均半径和均方根半径．对不同的源密度分布，计算了Ｋｒ的值．

The relations among the space-parameters, average radii and root-mean -square radii of the different pion source density distributions are obtained with the power series expansion of the two-pion correlation functions at the small relative momentum. The results are in good agreement with the experimental measurement of the central collisions 1.8A GeV Ar+Pb. The average radius and root-mean-square radius of the above reaction are given. The values of K=<r2> <r>2 for the different source density distributions are calculated.