  Temperature equilibration of hydrogen is studied for conditions relevant to
inertial confinement fusion. New molecular-dynamics simulations and results
from quantum many-body theory are compared with Landau-Spitzer (LS) predictions
for temperatures T from 50 eV to 5000 eV, and densities with Wigner-Seitz radii
r_s = 1.0 and 0.5. The relaxation is slower than the LS result, even for
temperatures in the keV range, but converges to agreement in the high-T limit.
