A Comprehensive Study of Low-Energy Response for Xenon-Based Dark Matter Experiments

Understand

We report a comprehensive study of the energy response to low-energy recoils in dual-phase xenon-based dark matter experiments.

• A recombination model is developed to explain the recombination probability as a function of recoil energy at zero field and non-zero field.
• The role of e-ion recombination is discussed for both parent recombination and volume recombination.
• We find that the volume recombination under non-zero field is constrained by a plasma effect, which is caused by a high density of charge carriers along the ionization track forming a plasma-like cloud of charge that shields the interior from the influence of the external electric field.