Measurement of emission spectrum for gaseous argon electroluminescence in visible light region from 300 to 600 nm

Aoyama, Kazutaka; Kimura, Masato; Morohoshi, Hiroyuki; Takeda, T.; Tanaka, M.; Yorita, K.

doi:10.1016/j.nima.2021.166107

Cited by 9 publications

(5 citation statements)

References 10 publications

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“…So far, the NBrS emission in the form of electroluminescence in noble gases has been experimentally and theoretically studied in refs. [15][16][17][18][19][20][21] and [15,[22][23][24] respectively, with predicted continuous spectrum in the visible and NIR range.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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

et al. 2022

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“…So far, the NBrS emission in the form of electroluminescence (secondary scintillation) in noble gases has been experimentally and theoretically studied in [15][16][17][18][19][20][21] and [15,[22][23][24] respectively, with predicted continuous spectrum in the visible and NIR range. It is known that secondary scintillations in the VUV in gaseous Ar due to the excimer effect are associated with primary scintillations in the VUV in liquid Ar due to the same excimer effect.…”

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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“…The S2 signals were recorded both in the vacuum ultraviolet (VUV) range and in that of visible and near infrared (NIR). The spectral range of the latter is provided by the neutral bremsstrahlung (NBrS) EL mechanism, which was introduced in [18] and then further studied in [19,20,21,22,23,24,25,26,27]. The EL mechanisms will be covered in more detail in section 3.3.…”

Section: Introductionmentioning

confidence: 99%

Puzzling time properties of proportional electroluminescence in two-phase argon detectors for dark matter searches

Buzulutskov,

Frolov,

Borisova

et al. 2022

Preprint

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Proportional electroluminescence (EL) in noble gases is the physical effect routinely used in twophase (liquid-gas) detectors for dark matter searches to record the primary ionization signal in the gas phase induced by particle scattering in the liquid phase. In this work, the time properties of visible-light EL in two-phase argon detectors have for the first time been systematically studied. In particular, two unusual slow components in the EL signal, with time constants of about 4-5 µs and 50 µs, were observed. Their puzzling property is that their contributions and time constants increase with electric field, which is not expected in any of the known mechanisms of photon and electron emission in two-phase media. In addition, a specific threshold behavior of the slow components was revealed: they emerged at a threshold in reduced electric field of about 5 Td regardless of the gas phase density, which is 1 Td above the onset of standard (excimer) EL. It is shown that this threshold is related to higher atomic excited states Ar * (3p 5 4p). An unexpected temperature dependence of slow components was also observed: their contribution decreased with temperature, practically disappearing at room temperature. We show that the puzzling properties of slow components can be explained in the framework of hypothesis that these are produced in the charge signal itself due to trapping of drifting electrons on metastable negative argon ions.Keywords two-phase detectors • liquid argon • dark matter • slow components • metastable negative argon ions

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Measurement of emission spectrum for gaseous argon electroluminescence in visible light region from 300 to 600 nm

Cited by 9 publications

References 10 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

Puzzling time properties of proportional electroluminescence in two-phase argon detectors for dark matter searches

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