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Low-diffusion Xe-He gas mixtures for rare-event detection: Electroluminescence Yield
Instrumentation and Detectors · Submitted 10 Jun 2019
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim We have measured the electroluminescence (EL) yield of Xe-He mixtures, in the range of 0 to 30% He and demonstrated the small impact on the EL yield of the addition of helium to pure xenon.
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The abstract, sentence by sentence
High pressure xenon Time Projection Chambers (TPC) based on secondary scintillation (electroluminescence) signal amplification are being proposed for rare event detection such as directional dark matter, double electron capture and double beta decay detection. The discrimination of the rare event through the topological signature of primary ionisation trails is a major asset for this type of TPC when compared to single liquid or double-phase TPCs, limited mainly by the high electron diffusion in pure xenon. Helium admixtures with xenon can be an attractive solution to reduce the electron diffusion significantly, improving the discrimination efficiency of these optical TPCs. We have measured the electroluminescence (EL) yield of Xe-He mixtures, in the range of 0 to 30% He and demonstrated the small impact on the EL yield of the addition of helium to pure xenon. For a typical reduced electric field of 2.5 kV/cm/bar in the scintillation region, the EL yield is lowered by ~ 2%, 3%, 6% and 10% for 10%, 15%, 20% and 30% of helium concentration, respectively. This decrease is less than what has been obtained from the most recent simulation framework in the literature. The impact of the addition of helium on EL statistical fluctuations is negligible, within the experimental uncertainties. The present results are an important benchmark for the simulation tools to be applied to future optical TPCs based on Xe-He mixtures.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | High pressure xenon Time Projection Chambers (TPC) based on secondary scintillation (electroluminescence) signal amplification are being proposed for rare event detection such as directional dark matter, double electron capture and double beta decay detection. | background 1.00 | 0.05 | 0.03 | asserted 0.70 |
| s1 | The discrimination of the rare event through the topological signature of primary ionisation trails is a major asset for this type of TPC when compared to single liquid or double-phase TPCs, limited mainly by the high electron diffusion in pure xenon. | background 0.93 | 0.06 | 0.04 | asserted 1.00 |
| s2 | Helium admixtures with xenon can be an attractive solution to reduce the electron diffusion significantly, improving the discrimination efficiency of these optical TPCs. | background 0.97 | 0.07 | 0.11 | hedged possibility 0.96 |
| s3 | We have measured the electroluminescence (EL) yield of Xe-He mixtures, in the range of 0 to 30% He and demonstrated the small impact on the EL yield of the addition of helium to pure xenon. | contribution 0.84 | 0.98 | 0.38 | asserted 1.00 |
| s4 | For a typical reduced electric field of 2.5 kV/cm/bar in the scintillation region, the EL yield is lowered by ~ 2%, 3%, 6% and 10% for 10%, 15%, 20% and 30% of helium concentration, respectively. | result 1.00 | 0.95 | 0.22 | asserted 1.00 |
| s5 | This decrease is less than what has been obtained from the most recent simulation framework in the literature. | interpretation 0.56 | 0.49 | 0.08 | asserted 1.00 |
| s6 | The impact of the addition of helium on EL statistical fluctuations is negligible, within the experimental uncertainties. | result 1.00 | 0.93 | 0.10 | asserted 1.00 |
| s7 | The present results are an important benchmark for the simulation tools to be applied to future optical TPCs based on Xe-He mixtures. | interpretation 0.93 | 0.27 | 0.17 | asserted 0.99 |
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The paper
Original abstract
High pressure xenon Time Projection Chambers (TPC) based on secondary scintillation (electroluminescence) signal amplification are being proposed for rare event detection such as directional dark matter, double electron capture and double beta decay detection. The discrimination of the rare event through the topological signature of primary ionisation trails is a major asset for this type of TPC when compared to single liquid or double-phase TPCs, limited mainly by the high electron diffusion in pure xenon. Helium admixtures with xenon can be an attractive solution to reduce the electron diffusion significantly, improving the discrimination efficiency of these optical TPCs. We have measured the electroluminescence (EL) yield of Xe-He mixtures, in the range of 0 to 30% He and demonstrated the small impact on the EL yield of the addition of helium to pure xenon. For a typical reduced electric field of 2.5 kV/cm/bar in the scintillation region, the EL yield is lowered by ~ 2%, 3%, 6% and 10% for 10%, 15%, 20% and 30% of helium concentration, respectively. This decrease is less than what has been obtained from the most recent simulation framework in the literature. The impact of the addition of helium on EL statistical fluctuations is negligible, within the experimental uncertainties. The present results are an important benchmark for the simulation tools to be applied to future optical TPCs based on Xe-He mixtures.
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How the literature uses it
9 arXiv papers cite this in 10 sentences
Papers citing it · 8 sentences without a confident label
Uses its data or values 1 paper
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The possibility of reducing the diffusion of the drifting electrons while keeping nearly intact the energy resolution of a pure xenon EL TPC by a substantial addition of helium, around 10-15%, has been also studied, firstly based on state-of-the-art microscopic simulations [ref] and then from measurements using a small gas proportional scintillation chamber; in particular, the EL yield of Xe–He mixtures is reduced by $∼$ 2%, 3%, 6% and 10% for 10%, 15%, 20% and 30% of He concentration (volume), respectively (a reduction which is even lower than the expectation from simulation results), without degrading the energy resolution [ref] .
Double Beta Decay Experiments at Canfranc Underground Laboratory · Results · 0.83
Cites it as background 1 paper
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Primary scintillation has been studied in solid and liquid xenon [ref] and in the gas phase [ref] for different types of interactions, while secondary scintillation promoted by electron impact has been studied mainly in the gas phase, [ref] and references therein.
Neutral Bremsstrahlung emission in xenon unveiled · Introduction · 0.98
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