Deep subthreshold π0 production in 36Ar+ 197Au collisions

We present in this paper transverse momentum and rapidity distributions of π0-mesons measured in 36Ar+197Au collisions at 25A and 35AMeV beam energies with the TAPS spectrometer at the KVI AGOR accelerator. pt spectra are consistent with thermal-like emission of π0-mesons with temperature parameters considerably lower than other available data at the same beam energies. Rapidity distributions point to the contribution of two different π0 production mechanisms.