Reconstructing the Source in Heavy Ion Collisions from Particle   Interferometry
  The preliminary CERN SPS NA49 Pb+Pb 158 GeV/A negative one- and two-particle spectra at mid-rapidity are consistent with a source of temperature 130 MeV, lifetime 9 fm/c, transverse flow 0.35, and a transverse geometric size which is twice as large as the cold Pb nucleus. 
Urs Achim Wiedemann, Boris Tomasik, Ulrich Heinz