Tübingen 2003 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 6: Physik mit schweren Ionen I

HK 6.5: Vortrag

Montag, 17. März 2003, 17:15–17:30, E

Nuclear stopping in ₄₄⁹⁶Ru(₄₀⁹⁶Zr) + ₄₄⁹⁶Ru(₄₀⁹⁶Zr) at 0.4 AGeV and 1.5 AGeV — •Young Jin Kim — Gesellschaft für Schwerionenforschung D-64291 Darmstadt, Germany

We use the isospin tracer method [1] [2] to obtain information on the degree of equilibrium and stopping in nucleus-nucleus collisions. Specifically we collide nuclei of the same mass but different neutron to proton ratio. For central collisions in the reaction ₄₄⁹⁶Ru + ₄₀⁹⁶Zr and ₄₀⁹⁶Zr + ₄₄⁹⁶Ru, we find that the ratios of the proton rapidity distributions point to incomplete mixing and partial transparency of the projectile and target nuclei. The effect is shown to increase when going from 0.4 AGeV to 1.5 AGeV. We also present the centrality dependence of proton and deuteron rapidity distributions in ₄₄⁹⁶Ru + ₄₄⁹⁶Ru at 0.4 AGeV. The data are compared to IQMD model calculations under various assumptions on the NN collision cross section in medium.
[1] F.Rami et al., Phys.Rev.Lett. 84, 1120(2000)
[2] B.Hong et al., Phys.Rev.C 66, 034901(2000)