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Using an advanced version of the hadron resonance gas model we have foundindications for irregularities in data for hadrons produced in relativisticheavy-ion collisions. These include an abrupt change of the effective number ofdegrees of freedom, a change of the slope of the ratio of lambda hyperons toprotons at laboratory energies 8.6--11.6 AGeV, as well as highly correlatedplateaus in the collision-energy dependence of the entropy per baryon, totalpion number per baryon, and thermal pion number per baryon at laboratoryenergies 6.9-11.6 AGeV. Also, we observe a sharp peak in the dimensionlesstrace anomaly at a laboratory energy of 11.6 AGeV. On the basis of thegeneralized shock-adiabat model we demonstrate that these observations giveevidence for the anomalous thermodynamic properties of the mixed phase at itsboundary to the quark-gluon plasma. We argue that the trace-anomaly peak andthe local minimum of the generalized specific volume observed at a laboratoryenergy of 11.6 AGeV provide a signal for the formation of a mixed phase betweenthe quark-gluon plasma and the hadron phase. This naturally explains the changeof slope in the energy dependence of the yield of lambda hyperons per proton ata laboratory energy of 8.6 GeV.

Thermodynamically Anomalous Regions and Possible New Signals of Mixed Phase Formation