Feng, ZH , CHINA CTR ADV SCI & TECHNOL,WORLD LAB,POB 8730,BEIJING 100080,PEOPLES R CHINA.
INST ATOM ENERGY,BEIJING 102413,PEOPLES R CHINA; ACAD SINICA,INST THEORET PHYS,BEIJING 100080,PEOPLES R CHINA
The proposed relativistic hadronic cascade model has been used to analyse two-pion Bose-Einstein correlation in central collision of Si + Au at AGS energy. The pi(-)pi(-) correlation function calculated according to the space-time and four momentum distributions of pi(-) at freeze-out agrees quite well with that of E802 experimental onse. We also have calculated the root mean squared length of the pi(-) source above and compared it with the conventional fitted radius of pi(-) source. It is mentioned that due to the non-Gaussian features in position and momentum distributions of the source and the dependence of the location upon the momentum especially, to regard the conventional fitted radius as the spatial extent of the source is dangerous. Instead, it might be more reliable to predict the spatial extent of the source with the root mean squared length.