Publications [#245411] of Steffen A. Bass

Papers Published
  1. Bravina, LV; Zabrodin, EE; Bleicher, M; Bass, SA; Brandstetter, M; Faessler, A; Fuchs, C; Greiner, W; Gorenstein, MI; Soff, S; Stöcker, H, Transition to resonance-rich matter in heavy-ion collisions at RHIC energies, Journal of Physics G: Nuclear and Particle Physics, vol. 27 no. 3 (2001), pp. 421-426 [0010088], [doi] .

    The equilibration of hot and dense nuclear matter produced in the central region in central Au + Au collisions at √s = 200 A GeV is studied within the microscopic transport model UrQMD. The pressure here becomes isotropic at t ≈ 5 fm c-1. Within the next 15 fm c-1 the expansion of the matter proceeds almost isentropically with the entropy per baryon ratio S/A ≈ 150. During this period the equation of state in the (P, ε)-plane has a very simple form, P = 0.15ε. Comparison with the statistical model (SM) of an ideal hadron gas reveals that the time of ≈ 20 fm c-1 may be too short to attain the fully equilibrated state. In particular, the fractions of resonances are overpopulated in contrast with the SM values. The creation of such a long-lived resonance-rich state slows down the relaxation to chemical equilibrium and can be detected experimentally.