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Tübingen 2003 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 6: Physik mit schweren Ionen I

HK 6.5: Talk

Monday, March 17, 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)

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