We report an extended measurement of the neutron cross section on argon in
the energy range of 95-720 MeV. The measurement was obtained with a 4.3-hour
exposure of the Mini-CAPTAIN detector to the WNR/LANSCE beam at LANL. Compared
to an earlier analysis of the same data, this extended analysis includes a
reassessment of systematic uncertainties, in particular related to unused wires
in the upstream part of the detector. Using this information we doubled the
fiducial volume in the experiment and increased the statistics by a factor of
2.4. We also shifted the analysis from energy bins to time-of-flight bins. This
change reduced the overall considered energy range, but improved the
understanding of the energy spectrum of incoming neutrons in each bin. Overall,
the new measurements are extracted from a fit to the attenuation of the neutron
flux in five time-of-flight regions: 140 ns - 180 ns, 120 ns - 140 ns, 112 ns -
120 ns, 104 ns - 112 ns, 96 ns - 104 ns. The final cross sections are given for
the flux-averaged energy in each time-of-flight bin:
σ(146 MeV)=0.60−0.14+0.14​±0.08(syst) b,
σ(236 MeV)=0.72−0.10+0.10​±0.04(syst) b,
σ(319 MeV)=0.80−0.12+0.13​±0.040(syst) b,
σ(404 MeV)=0.74−0.09+0.14​±0.04(syst) b,
σ(543 MeV)=0.74−0.09+0.09​±0.04(syst) b.Comment: 15 pages, 7 tables, 11 figures. Prepared for submission to PR