# Measurement of the ionization yield of nuclear recoils in liquid argon using a two-phase detector with electroluminescence gap

## TL;DR

This study measures the ionization yield of nuclear recoils in liquid argon using a two-phase detector, providing data crucial for calibrating dark matter and neutrino detection experiments.

## Contribution

It presents new measurements of ionization yields at specific energies and electric fields, advancing understanding of liquid argon detectors for particle physics.

## Key findings

- Ionization yields of 5.9 ± 0.8 and 7.4 ± 1 e⁻/keV at 233 keV
- Dependence of ionization yield on energy and electric field characterized
- Results compared with previous measurements at different energies and fields

## Abstract

A measurement of ionization yields in noble-gas liquids is relevant to the energy calibration of nuclear recoil detectors for dark matter search and coherent neutrino-nucleus scattering experiments. In this work we further study the ionization yield of nuclear recoils in liquid Ar, using a two-phase detector with an electroluminescence gap and DD neutron generator. The ionization yields of nuclear recoils in liquid Ar were measured at 233 keV and electric fields of 0.56 and 0.62 kV/cm; their values amounted to 5.9 $\pm$ 0.8 and 7.4 $\pm$ 1 e$^-$/keV, respectively. The characteristic dependences of the ionization yield on energy and electric field were determined, while comparing the results obtained to those at lower energies and higher fields.