Delta Rays: A Novel Calibration for the Deep Underground Neutrino Experiment (DUNE) for Low Energy Astrophysical Neutrinos

Future neutrino observatories, like the Deep Underground Neutrino Experiment (DUNE), will be sensitive to supernovae and solar neutrinos of low energies. These neutrinos offer a unique look inside stars and stellar explosions. Inside the DUNE liquid argon time projection chamber, low-energy electron neutrinos will produce visible electrons. In this talk, we will present a preliminary study of delta-rays that have similar energies to the electrons scattered by low-energy astrophysical neutrinos. Unlike neutrinos, delta-rays are a well understood "standard candle." Furthermore, they provide ample statistics, a valuable feature in the otherwise quiet underground environment. We will outline how they can be used to calibrate DUNE's response to $< 30$ MeV electrons in situ.