  In high energy collisions nuclei are practically transparent to each other
but produce very hot, nearly baryon-free, matter in the central rapidity
region. Where do the baryons go? We calculate the energy loss of the nuclei
using the color glass condensate model. Using a space-time picture of the
collision we calculate the baryon and energy densities of the receding baryonic
fireballs. For central collisions of large nuclei at RHIC and LHC we find
baryon densities more than ten times that of atomic nuclei over a large volume
which appear at high rapidities. These results can and are being used as
initial conditions for subsequent hydrodynamic evolution and could test the
equation of state of matter at very high baryon densities.
