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Bochum 1998 – scientific programme

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HK: Hadronen und Kerne

HK 24: Heavy Ion Reactions III, Ultrarelativistic Energies

HK 24.1: Talk

Tuesday, March 17, 1998, 14:00–14:15, P

Identified charged particle spectra in ultrarelativistic heavy ion collisions — •Z. B"or"ocz1, C. Barlag1, S. Bathe1, C. Blume1, D. Bucher1, H. B"usching1, R. Glasow1, S. Gorus1, S. Joerrens1, H. K"ohncke1, T. Kr"umpel1, T. Peitzmann1, K. Reygers1, R. Santo1, H. Schlagheck1, and WA9821Institut f"ur Kernphysik, Universit"at M"unster, D-48149 M"unster — 2

The two arm spectrometer for charged particles in the WA98 experiment has measured different particle species which were produced in Pb - Pb collisions at a beam energy of 158 AGeV. The pt - spectra of different particles allow the study of the freeze-out temperature and radial flow. The rapidity distribution of baryons at mid-rapidity provide a sensitive probe for the collision dynamics: the stopping power should determine the dependence between the energy which is available for excitation of the system and the incoming longitudinal energy. Strangeness production is important concerning the chemical equilibrium, which is predicted in thermal models. We will discuss transversal momentum spectra and ratios of pions, kaons and protons.
* Partly supported by the German BMBF and the GSI.

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