Abstract
MeV-scale energy depositions by low-energy photons produced in neutrino-argon interactions have been identified and reconstructed in ArgoNeuT liquid argon time projection chamber (LArTPC) data. ArgoNeuT data collected on the NuMI beam at Fermilab were analyzed to select isolated low-energy depositions in the TPC volume. The total number, reconstructed energies and positions of these depositions have been compared to those from simulations of neutrino-argon interactions using the FLUKA Monte Carlo generator. Measured features are consistent with energy depositions from photons produced by de-excitation of the neutrino's target nucleus and by inelastic scattering of primary neutrons produced by neutrino-argon interactions. This study represents a successful reconstruction of physics at the MeV-scale in a LArTPC, a capability of crucial importance for detection and reconstruction of supernova and solar neutrino interactions in future large LArTPCs.
Highlights
MeV-scale energy depositions by low-energy photons produced in neutrino-argon interactions have been identified and reconstructed in ArgoNeuT liquid argon time projection chamber (LArTPC) data
This study represents a successful reconstruction of physics at the MeV scale in a LArTPC, a capability of crucial importance for detection and reconstruction of supernova and solar neutrino interactions in future large LArTPCs
The ability to reconstruct activity at the MeV scale in a LArTPC is crucial for future studies of supernova, solar, and beam neutrino interactions
Summary
The liquid argon time projection chamber (LArTPC) is a powerful detection technology for neutrino experiments, as it allows for millimeter spatial resolution, provides. In most of the existing measurements, LArTPCs were placed in high-energy neutrino beams to study GeV-scale muon and electron neutrinos as well as final-state products, generally with energies greater than 100 MeV. LArTPC experiments utilizing GeV-scale neutrino beam lines would benefit from the ability to perform a reconstruction of MeV-scale features. This ability would allow for a fuller reconstruction of beam neutrino events by enabling reconstruction of photons released during deexcitation of the nucleus and of part of the energy transferred to final-state neutrons.
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