Pion-source geometry deduced from soft-pion interferometry in heavy-ion collisions at 650 A MeV
We report transverse,RT, and longitudinal,RL, source sizes extracted from two-pion interferometry analysis in the Au+Au and Nb + Nb interactions at 650 A MeV. For the Nb+Nb interactions, both,RT andRL, do not exceed the niobium nucleus radius. In the case of Au+Au collisions, the transverse size is larger than the longitudinal one being about 12 fm for the selection ofPπ+ < 120 MeV/c. We also corroborate the existence of the previously reported specific three-pion correlations.