Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2001-10-17
Phys.Rev. C66 (2002) 044905
Physics
Nuclear Physics
Nuclear Theory
6 pages, REVTEX4
Scientific paper
10.1103/PhysRevC.66.044905
The experimental data on hadron yields and ratios in central lead-lead and gold-gold collisions at 158 AGeV/$c$ (SPS) and $\sqrt{s} = 130$ AGeV (RHIC), respectively, are analysed within a two-source statistical model of an ideal hadron gas. A comparison with the standard thermal model is given. The two sources, which can reach the chemical and thermal equilibrium separately and may have different temperatures, particle and strangeness densities, and other thermodynamic characteristics, represent the expanding system of colliding heavy ions, where the hot central fireball is embedded in a larger but cooler fireball. The volume of the central source increases with rising bombarding energy. Results of the two-source model fit to RHIC experimental data at midrapidity coincide with the results of the one-source thermal model fit, indicating the formation of an extended fireball, which is three times larger than the corresponding core at SPS.
Faesler Amand
Fuchs Ch.
Lu Zhong-Dao
Zabrodin Eugene E.
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