Abstract
Pion multiplicity and energy spectrum in medium energy heavy-ion collisions are analyzed in a model with spherical expansion, resonance decay contribution, and chemical nonequilibrium effects. fitting the data for central La+La collision at ${\mathit{E}}_{\mathrm{lab}}$=1.35 GeV/nucleon we find that the physically reasonable freeze-out conditions require a strong collective motion to describe the pion spectrum and a positive value of pion chemical potential to fit the total pion multiplicity. The data do not lend to conclusive evidence on the presence of \ensuremath{\Delta} resonance at the freeze-out.
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