%0 Generic
%A Merschmeyer, Markus
%D 2004
%F heidok:5061
%R 10.11588/heidok.00005061
%T Production and Flow of Neutral Strange Particles in Ni+Ni Collisions at 1.93 AGeV
%U https://archiv.ub.uni-heidelberg.de/volltextserver/5061/
%X This thesis presents results on the production and the flow of $K^0$ and $\Lambda^0$ in Ni+Ni collisions at an energy of 1.93 AGeV. The analyzed data sample of 10$^8$ central events has been recorded during 12 days using an upgraded data acquisition with a fast online data reduction algorithm. Part of this work was the implementation of this algorithm on a digital signal processor. The slope parameter and yield distributions of the $K^0$ are found to agree with those of previously measured $K^+$. Comparisons to transport model calculations (UrQMD, IQMD) show that none of the models is able to consistently describe those distributions for both, $K^0$ and $\Lambda^0$. The integral and the differential directed flow of the $K^0$ are found to agree with that of the $K^+$, supporting the evidence for a repulsive $K^+$N potential. Comparing the directed flow of $\Lambda^0$ and protons, no significant difference is found between both for the integral as well as the differential flow. This brings up the issue of the strength of the in-medium $\Lambda$N potential and its relation to the magnitude of the observed flow. A method to reconstruct $\Xi^-$ and $\Sigma^-(1385)$ baryons has been developed and candidates of both particles have been identified. The very small reconstruction efficiency requires confirmation through an experiment with a significantly larger statistics, though.