  We consider hadron production in high energy collisions as an Unruh radiation
phenomenon. This mechanism describes the production pattern of newly formed
hadrons and is directly applicable at vanishing baryochemical potential, mu =
0. It had already been found to correctly yield the hadronisation temperature,
T_h = sqrt(sigma / 2 pi) = 165 MeV in terms of the string tension sigma. Here
we show that the Unruh mechanism also predicts hadronic freeze-out conditions,
giving s/T_h^3 = 3 pi^2 / 4 = 7.4 in terms of the entropy density s and E/N =
\sqrt(2 pi sigma) = 1.09 for the average energy per hadron. These predictions
provide a theoretical basis for previous phenomenological results and are also
in accord with recent lattice studies.
