S. Ahmad et al., NUCLEAR-MATTER EXPANSION PARAMETERS FROM THE MEASUREMENT OF DIFFERENTIAL MULTIPLICITIES FOR LAMBDA-PRODUCTION IN CENTRAL AU+AU COLLISIONS AT AGS, Nuclear physics. A, 636(4), 1998, pp. 507-524
The double differential multiplicities and rapidity distributions for
Lambda hyperon production in central Au + Au interactions at AGS in th
e range of rapidities from 1.7 to 3.2 GeV and the range of transverse
kinetic energies from 0.0 to 0.7 GeV are parametrized in terms of the
Blast Wave approximation. The longitudinal and transverse radial expan
sion parameters and the mean temperature of Lambda hyperons after the
freeze-out of the nuclear matter are presented. The predictions of the
RQMD model with and without mean field potentials are compared to our
data. Both variants of RQMD are parameterized in terms of the Blast W
ave model and the results of such parameterizations are compared to th
e experimental ones. It is found that inclusion of the repulsive mean
field potentials in RQMD is essential to account for the strong expans
ion observed in the data. (C) 1998 Published by Elsevier Science B.V.