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VOLUME 48 (1988) | ISSUE 5 | PAGE 233
Observation of slow-pion production in nucleus-nucleus interactions
The production of slow 77 ± mesons in nucleus-nucleus interactions has been observed in a nuclear emulsion. The spectrum has the typical evaporation shape, with a temperature T~ 3.5 + 0.4 MeV and a threshold V~ 0.2 + 0.3 MeV, at pion energies up to 13 MeV. Most of the pion production occurs in central collisions.