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HK: Fachverband Hadronen und Kerne

HK 45: Heavy Ion Collisions and QCD phases

HK 45.7: Talk

Wednesday, March 18, 2009, 15:45–16:00, H-ZO 10

Charged kaon flow measurements in Ni+Ni collisions at 1.91A GeV with the FOPI detector — •tae im kang — GSI, Darmstadt, Germany — Korea University, Seoul, Korea

The FOPI collaboration studies bulk properties of nuclear matter as well as in-medium effects on hadrons in a hot and dense environment. The latter are assessed by the measurements of particle yields, momentum distributions, and the azimuthal emission pattern with respect to the reaction plane. Kaons have obtained particular interest. At SIS/GSI, kaons are produced in nucleus-nucleus collisions at sub-threshold energies [1]. Theory suggest that in the medium the kaon effective masses change. These changes can be understood as a consequence of a density dependent kaon-nucleon potential. The measurement of charged kaon flow can provide important information on this in-medium potential [2].

To improve the charged kaon measurement, FOPI has successfully upgraded its apparatus with a novel Multi-strip Multi-gap RPC (MMRPC) Time-of-Flight detector system in 2007 [3]. In this presentation we show first results obtained with this new detector for charged kaon production in Ni+Ni collisions at 1.91A GeV.

This work was supported by EU/FP6 I3 HP, R113-CT-2004-506078; BMBF 06HD190i; DFG 446 KOR 113/216/0-1.

[1] K. Wiśniewski et al., Eur. Phys. Journ. A 9, 515, 2000.

[2] G. Q. Li et al., Phys. Rev. Lett. 74, 235-238, 1995.

[3] A. Schüttauf et al., Nucl. Phys. B Proc. Supp. 158, 52, 2006.