  The cross section for neutron interactions on argon is an important design
and operational parameter for a number of neutrino, dark matter, and
neutrinoless double beta decay experiments which use liquid argon as a
detection or shielding medium. There is a discrepancy between the evaluated
total cross section in the $20$ to $70~\rm$\,keV neutron kinetic energy region
given in the ENDF database and a single measurement conducted by an experiment
with a thin target (0.2 atoms/barn) optimized for higher cross sections. This
gives rise to significant uncertainty in the interaction length of neutrons in
liquid argon. This discrepancy is now resolved by new results presented here
from the Argon Resonance Transport Interaction Experiment (ARTIE), a thick
target experiment (3.3 atoms/barn) optimized for the small cross sections in
this energy region.
