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NEWS Enhanced out-of-plane



emission of K + mesons in relativistic heavy-ion reactions Further evidence for the predicted repulsive K + nucleon potential in nuclear matter New data from the KAOS spectrometer at GSI reveal an azimuthally anisotropic distribution of K + mesons in relativistic gold-gold collisions. In peripheral and semi-central collisions, K + mesons are preferentially emitted perpendicular to the reaction plane. The results are consistent with the theoretical prediction of a repulsive K + nucleon potential in nuclear matter. The behaviour of hadrons in hot and dense nuclear matter is one of the central topics of the nuclear reaction program at GSI. In particular, the production and propagation of strange Figure 1: Geometrical aspects of a relativistic heavy-ion collision event (in the center of mass frame). In the present experiment, the azimuthally anisotropic K + emission was measured for gold-gold collisions at 1 AGeV. Heavy-ion collision out-of-plane emission G impact parameter b reaction plane out-of-plane emissio

Year: 2010
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