| Autor: |
Alt, C., Botje, M.A.J., van Leeuwen, M.A., Mischke, A., Subatomic Physics, Dep Natuurkunde |
| Rok vydání: |
2008 |
| Předmět: |
|
| Zdroj: |
Physical Review. C, Nuclear physics, 77. American Physical Society |
| ISSN: |
0556-2813 |
| Popis: |
Measurements of Bose-Einstein correlations of pion pairs in central Pb+Pb collisions were performed with the NA49 detector at the CERN SPS for beam energies of 20A, 30A, 40A, 80A, and 158A GeV. Correlation functions were measured in the longitudinally co-moving ``out-side-long'' reference frame as a function of rapidity and transverse momentum in the forward hemisphere of the reaction. Radius and correlation strength parameters were obtained from fits of a Gaussian parametrization. The results show a decrease of the radius parameters with increasing transverse momentum characteristic of strong radial flow in the pion source. No striking dependence on pion-pair rapidity or beam energy is observed. Static and dynamic properties of the pion source are obtained from simultaneous fits with a blast-wave model to radius parameters and midrapidity transverse momentum spectra. Predictions of hydrodynamic and microscopic models of Pb+Pb collisions are discussed. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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