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Article Abstract
We report the measurement of the final-state products of negative pion and muon nuclear capture at rest on argon by the LArIAT experiment at the Fermilab Test Beam Facility. We measure a population of isolated MeV-scale energy depositions, or blips, in 296 LArIAT events containing tracks from stopping low-momentum pions and muons. The average numbers of visible blips are measured to be 0.74±0.19 and 1.86±0.17 near muon and pion track endpoints, respectively. The 3.6σ statistically significant difference in blip content between muons and pions provides the first demonstration of a new method of pion-muon discrimination in neutrino liquid argon time projection chamber experiments. LArIAT Monte Carlo simulations predict substantially higher average blip counts for negative muon (1.22±0.08) and pion (2.34±0.09) nuclear captures. We attribute this difference to geant4's inaccurate simulation of the nuclear capture process.
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