First event-by-event Cherenkov separation from sub-MeV electrons in liquid argon enables a proof-of-principle ALP search excluding new parameter space despite no observed excess.
Ion-beam excitation of liquid argon
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abstract
The scintillation light of liquid argon has been recorded wavelength and time resolved with very good statistics in a wavelength interval ranging from 118 nm through 970 nm. Three different ion beams, protons, sulfur ions and gold ions, were used to excite liquid argon. Only minor differences were observed in the wavelength-spectra obtained with the different incident particles. Light emission in the wavelength range of the third excimer continuum was found to be strongly suppressed in the liquid phase. In time-resolved measurements, the time structure of the scintillation light can be directly attributed to wavelength in our studies, as no wavelength shifter has been used. These measurements confirm that the singlet-to-triplet intensity ratio in the second excimer continuum range is a useful parameter for particle discrimination, which can also be employed in wavelength-integrated measurements as long as the sensitivity of the detector system does not rise steeply for wavelengths longer than 190 nm. Using our values for the singlet-to-triplet ratio down to low energies deposited a discrimination threshold between incident protons and sulfur ions as low as $\sim$2.5 keV seems possible, which represents the principle limit for the discrimination of these two species in liquid argon.
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2026 2representative citing papers
A dedicated purification system using copper catalyst and molecular sieves improved liquid argon purity for LEGEND-200 from τ_t ≈ 0.9 μs to 1.3 μs, with final measured value of 1.16 μs limited by accidental nitrogen contamination.
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First Demonstration of a Hybrid Cherenkov and Scintillation Detector in a Proof-of-Principle Axion Search at a Beam Dump
First event-by-event Cherenkov separation from sub-MeV electrons in liquid argon enables a proof-of-principle ALP search excluding new parameter space despite no observed excess.
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Procurement and Purification of Liquid Argon for the LEGEND-200 Experiment
A dedicated purification system using copper catalyst and molecular sieves improved liquid argon purity for LEGEND-200 from τ_t ≈ 0.9 μs to 1.3 μs, with final measured value of 1.16 μs limited by accidental nitrogen contamination.