  Total reaction cross sections of light projectile nucleus (H-2, H-3, He-3 and
He-4) interactions with nuclei are calculated using Geant4 models, and compared
with experimental data. It is shown that the models give various predictions at
low energies, in the region of the Coulomb barrier. "Shen model" (W.-Q. Shen et
al., Nucl. Phys. {\bf A491} (1989) 130) is identified as an improvement over
other models.
