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Article overview
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Puzzling time properties of proportional electroluminescence in two-phase argon detectors for dark matter searches | | A. Buzulutskov
; E. Frolov
; E. Borisova
; V. Nosov
; V. Oleynikov
; A. Sokolov
; | | Date: |
1 Jun 2022 | | Abstract: | Proportional electroluminescence (EL) in noble gases is the physical effect
routinely used in two-phase (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 $mu$s and 50 $mu$s, 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. | | Source: | arXiv, 2206.00296 | | Services: | Forum | Review | PDF | Favorites | |
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