Abstract
The relation between the rapidity density of produced particles in ultrarelativistic nuclear collisions and the maximum proper energy density is derived. The new scaling hydrodynamic equations of Bjorken, Kajantie, and McLerran are employed. The results exceed earlier estimates obtained with inside-outside cascade models and provide an independent estimate of from collision data. We also derive a lower bound on incorporating viscous heating and the first-order phase transition between the quark and hadronic phases. We infer that GeV/ can indeed be reached in the collision of heavy nuclei at cosmic-ray energies.
- Received 15 August 1983
DOI:https://doi.org/10.1103/PhysRevD.29.419
©1984 American Physical Society