Detect Supernova Neutrinos with DarkSide-20k LAr TPC

Simulations of core collapse supernovae have undergone great progress in the last decade, yet detections of supernova neutrinos are needed to test these theoretical models. The neutronization burst has yet to be observed; the mechanism that triggers the explosion needs to be tested by observation. In addition, core collapse supernovae provide opportunities to study some fundamental properties of neutrinos, including its absolute mass and mass hierarchy. We report here that DarkSide-20k LAr TPC can play an important and unique role in such observation. It detects neutrinos via coherent elastic neutrino nucleus scattering (CEvNS) which is neutral current interaction and flavor blind. For a typical supernova at a distance of 10 kpc, the 39 tonne LAr TPC can detect about 200 - 300 neutrino events. The supernova neutrino spectrum and the total energy emitted can be measured independent of flavor oscillation. The background level in DarkSide-20k LAr TPC is low, allowing good sensitivity for many measurements.