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The Monte Carlo simulation program has been used to study low energy channeling in the single-wall nanotube and its rope, in comparisons between beam sizes and between light (He) and heavy (Ar) ions. The simulation mainly shows that the critical angle Psi(C) = 48 E-1/2 (E is incident energy) for the He (light) ion channeling but Psi(C) = 18 E-1/2 for the Ar (heavy) ion channeling, in the (17,0) zigzag single-wall nanotube. Thus, it might be found in the simulation that Psi(C) strongly depends on the ion mass. (C) 2007 Elsevier B.V. All rights reserved.