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.
Exploring N 2 captur- ing in Liquid Argon using Li-FAU Mol Sieve in the Iceberg Cryostat,
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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.