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Measurement of the nuclear ionization quench factor in a dual-phase argon detector

Coherent neutrino-nuclear scattering (CNS) has long been predicted by the standard model [1], but has yet to be observed. One of the most promising approaches that could result in CNS detection is the use of a dual-phase argon detector [2], For this demanding measurement it is essential that the nuclear ionization quench factor be known, which is not the case for liquid argon at typical CN. S energies — We have built the Gamma or Neutron Argon Recoils Resulting in Liquid Ionization (G/NARRLI) detector for the purpose of measuring the nuclear ionization quench factor at CNS energies. We plan to use neutron scatter recoils to measure the nuclear ionization quench factor at ∼8 keV, while using nuclear resonance fluorescence (NRF) recoils to measure the nuclear ionization quench factor between −∼100 eV and ∼ 4.5 keV. In making these measurements, we will map the regime of reactor neutrino CNS recoil in Ar and validate Monte Carlo models for calculating the nuclear quench factor [2].