Within a hydro-inspired blast-wave model, we combine the single-particle m t spectra of π − and transverse mass dependence of two-pion HBT radius R s to extract the thermal freeze-out temperature T and the surface radial flow rapidity ρ 0 for six centrality classes in Au+Au collisions at √ s NN = 200 GeV measured by the STAR Collaboration at the RHIC. The obtained T and ρ 0 are consistent with those of simultaneous fits of the single-particle m t spectra of π ± , K ± , p and p except for the peripheral collisions. The data can be well described by the blast-wave model, and the assumption that π ± , K ± , p and p freeze-out with the same thermal temperature and transverse flow profile is relatively good for central and mid-central collisions. Furthermore, we simulate the blast-wave emitting source by a Monte Carlo method and use the program CRAB to get the transverse mass dependence of the kaon HBT radius R s . The 1σ chi-square contours of m t spectrum and HBT radius R s of kaon have a relatively wide overlap region in the T-ρ 0 plane, which leads to large errors when we combine both observables of kaon to extract its temperature and flow velocity.
Using the AMPT model with string melting, we investigate the effect of collective phase transition of partons on the two-pion HBT radii. The results indicate that collective hadronization of partons at t = 5 fm/c flattens the transverse mass dependence of HBT radii, especially for transverse radii R o and R s . The radii calculated from the pion emission function (exclude pions with freeze-out time after 30 fm/c) are consistent with the HBT radii obtained by Gaussian fit to the correlation function. The r-t correlation and coordinate-momentum correlation of a pion source for collective hadronization are relatively weaker than those for parton-wise hadronization.
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