Phase Boundary of Matter
Within the study of hot hadronic matter the Hagedorn temperature is today understood as the phase boundary temperature between the hadron gas phase and the deconfined state of mobile quarks and gluons. Numerous experiments involving high energy nuclear collisions are underway at CERN-SPS and at the RHIC collider at Brookhaven National Laboratory (BNL) testing these new concepts. Nuclei, rather than protons, are used in these experiments in order to maximize the volume of quark deconfinement. This allows a more clear study of the signature of the formation of a new phase of matter, the quark-gluon plasma (QGP).
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