Measurement of the in-medium K0 inclusive cross section in pi- -induced   reactions at 1.15 GeV/c
  The K0 meson production by pi- mesons of 1.15 GeV/c momentum on C, Al, Cu, Sn and Pb nuclear targets was measured with the FOPI spectrometer at the SIS accelerator of GSI. Inclusive production cross-sections and the momentum distributions of K0 mesons are compared to scaled elementary production cross-sections and to predictions of theoretical models describing the in-medium production of kaons. The data represent a new reference for those models, which are widely used for interpretation of the strangeness-production in heavy-ion collisions. The presented results demonstrate the sensitivity of the kaon production to the reaction amplitudes inside nuclei and point to the existence of a repulsive KN-potential of 20+-5 MeV at normal nuclear matter density. 
M. L. Benabderrahmane, N. Herrmann, K. Wisniewski, J. Kecskemeti, A.   Andronic, V. Barret, Z. Basrak, N. Bastid, P. Buehler...