Near-infrared scintillation of liquid argon: recent results obtained with the NIR facility at Fermilab

Escobar, C. O.; Rubinov, P.; Tilly, E.

doi:10.1088/1748-0221/13/03/c03031

Cited by 5 publications

(7 citation statements)

References 26 publications

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“…The present results are also in compliance with those of [11,13] (FNAL group): light emission in the NIR in liquid Ar were observed there in the range of 715-900 nm, when irradiated with 511 keV gamma-rays and 5.4 MeV alpha particles. Analyzing the pulse shapes presented in [11], one may conclude that the authors observed the fast (𝜏 𝑓 < 100 ns) and slow (𝜏 𝑠 = 2-4 μs) signal components, similarly to that of the present work.…”

Section: Comparison With the Previous Resultssupporting

confidence: 92%

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Study of visible-light emission in pure and methane-doped liquid argon

et al. 2022

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In liquid argon TPCs for dark matter search and neutrino detection experiments, primary scintillation light is used as a prompt signal of particle scattering, being intensively produced in the vacuum ultraviolet (VUV) due to excimer emission mechanism. On the other hand, there were indications on the production of visible-light emission in liquid argon, albeit at a much lower intensity, the origin of which is still not clear. The closely related issue is visible-light emission in liquid argon doped with methane, the interest in which is due to the possible use in neutron veto detectors for those experiments. In this work we study in detail the properties of such light emission in pure liquid argon and its mixtures with methane. In particular, the absolute photon yield of visible-light emission in pure liquid argon was measured to be about 200 and 90 photon/MeV for X-rays and alpha particles respectively. In liquid argon doped with methane the photon yield dropped down significantly, by about an order of magnitude at a methane molar content varying from 0.01 to 1%, and then almost did not change when further increasing the methane content up to 10%.

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Section: Comparison With the Previous Resultssupporting

confidence: 92%

“…On the other hand, there were indications on light emission in the visible and near infrared (NIR) range in liquid Ar in S1 signal [6][7][8][9][10][11][12][13][14], albeit at a much lower yield, of the order of 500 photon/MeV [6], the origin of which is still not clear.…”

Section: Introductionmentioning

confidence: 99%

Study of visible-light emission in pure and methane-doped liquid argon

et al. 2022

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show abstract

“…The present results are also in compliance with those of [11,13] (FNAL group): primary scintillations in the NIR in liquid Ar were observed there in the range of 715-900 nm, when irradiated with 511 keV gamma-rays and 5.4 MeV alpha particles. Analyzing the pulse shapes presented in [11], one may conclude that the authors observed the fast (𝜏 𝑓 < 100 ns) and slow (𝜏 𝑠 = 2 − 4 𝜇s) signal components, similarly to that of the present work.…”

Section: Comparison With the Previous Resultssupporting

confidence: 92%

“…On the other hand, there were indications on the production of primary scintillations in the visible and near infrared (NIR) range in liquid Ar [6][7][8][9][10][11][12][13][14], albeit at a much lower yield, of the order of 500 photon/MeV [6], the origin of which is still not clear.…”

Section: Introductionmentioning

confidence: 99%

Study of visible-light emission in pure and methane-doped liquid argon

Bondar¹,

Borisova²,

Buzulutskov³

et al. 2022

Preprint

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In liquid argon TPCs for dark matter search and neutrino detection experiments, primary scintillations are used as a prompt signal of particle scattering, being intensively produced in the vacuum ultraviolet (VUV) due to excimer emission mechanism. On the other hand, there were indications on the production of visible light scintillations in liquid argon, albeit at a much lower intensity, the origin of which is still not clear. The closely related issue is visible light scintillations in liquid argon doped with methane, the interest in which is due to the possible use in neutron veto detectors for those experiments. In this work we study in detail the properties of such scintillations in pure liquid argon and its mixtures with methane. In particular, the absolute photon yield of visible light scintillations in pure liquid argon was measured to be about 200 and 90 photon/MeV for X-rays and alpha particles respectively. In liquid argon doped with methane the photon yield dropped down significantly, by about an order of magnitude at a methane content varying from 0.01 to 1%, and then almost did not change when further increasing the methane content up to 10%. There are firm indications that the mechanism of visible light scintillations in liquid argon and its mixtures with methane is that of neutral bremsstrahlung of primary ionization electrons.

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“…Even if the total number of quanta is higher than assumed here, due to W being lower, as recently measured by EXO-200, 11.5 ± 0.5 eV [110] as opposed to 13.7 ± 0.2 eV (Dahl [36]) or 13.4 ± 0.4 eV (Goetzke, neriX [65]) or 13.8 ± 0.9 eV (Doke [78]), then this basement is unlikely to change significantly, as even F q = 0 was explored above. This discrepancy, observed in the light not charge channel and thus unlikely to be due to charge amp calibration differences, may be due to SiPMs being more sensitive (relative to PMTs) to wavelengths other than VUV, such as infrared (IR scintillation has been observed in LAr [116]). While at 2 nd order the fluctuation models in NEST would have to be revised, to 1 st order everything discussed here would remain the same, but with g 1 and g 2 estimates decreasing by ∼15%.…”

Section: High Energy: the Mev Scale (Neutrinoless Double-beta Decay)mentioning

confidence: 99%

A Review of Basic Energy Reconstruction Techniques in Liquid Xenon and Argon Detectors for Dark Matter and Neutrino Physics Using NEST

Szydagis,

Block,

Farquhar

et al. 2021

Preprint

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Detectors based upon the noble elements, especially liquid xenon as well as liquid argon, as both single-and dual-phase types, require reconstruction of the energies of interacting particles, both in the field of direct detection of dark matter (WIMPs, axions, et al.) and in neutrino physics. Experimentalists, as well as theorists who reanalyze/reinterpret experimental data, have used a few different techniques over the past few decades. In this paper, we review techniques based on solely the primary scintillation channel, the ionization or secondary channel available at non-zero drift electric fields, and combined techniques that include a simple linear combination and weighted averages, with a brief discussion of the application of profile likelihood, maximum likelihood, and machine learning. Comparing results for electron recoils (beta and gamma interactions) and nuclear recoils (primarily from neutrons) from the NEST simulation to available data, we confirm that combining all available information generates higher-precision means, lower widths (energy resolution), and more symmetric shapes (approximately Gaussian) especially at keV-scale energies, with the symmetry even greater when thresholding is addressed. Near thresholds, bias from upward fluctuations matters. For MeV-GeV scales, if only one channel is utilized, an ionization-only-based energy scale outperforms scintillation; channel combination remains beneficial. We discuss what major collaborations use.

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Near-infrared scintillation of liquid argon: recent results obtained with the NIR facility at Fermilab

Cited by 5 publications

References 26 publications

Study of visible-light emission in pure and methane-doped liquid argon

Study of visible-light emission in pure and methane-doped liquid argon

Study of visible-light emission in pure and methane-doped liquid argon

A Review of Basic Energy Reconstruction Techniques in Liquid Xenon and Argon Detectors for Dark Matter and Neutrino Physics Using NEST

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