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We present the results of a study of charged pion production in 12C + 12Ccollisions at incident beam energies of 1A GeV and 2A GeV using the HADESspectrometer at GSI. The main emphasis of the HADES program is on thedielectron signal from the early phase of the collision. Here, however, wediscuss the data with respect to the emission of charged hadrons, specificallythe production of pi+- mesons, which are related to neutral pions representinga dominant contribution to the dielectron yield. We have performed the firstlarge-angular range measurement of the distribution of pi+- mesons for the 12C+ 12C collision system covering a fairly large rapidity interval. The pionyields, transverse-mass and angular distributions are compared withcalculations done within a transport model, as well as with existing data fromother experiments. The anisotropy of pion production is systematicallyanalyzed.

Measurement of charged pions in 12C + 12C collisions at 1A GeV and 2A GeV with HADES