2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/196402We study the pi+- spectra obtained in 2,4,6,8 A GeV Au-Au collisions within the thermal model. We find that the main features of the data can be well described after we include the pions from the decay of the Delta-resonance with medium mass modification.6 pages incl. 2 figs and 2 tables, final version in press in the EPJ-A (Hadrons and Nuclei). TITLE slightly changedNuclear TheoryHigh Energy Physics - PhenomenologyNuclear Experimenttext