Measurement of charge and light yields for Xe127 L -shell electron captures in liquid xenon

Abstract

Measurement of charge and light yields for math xmlns="http://www.w3.org/1998/Math/MathML" display="inline">mrow>mmultiscripts>mrow>mi>Xe/mi>/ mrow>mprescripts>/mprescripts>none>/none>mrow>mn >127/mn>/mrow>/mmultiscripts>/mrow>/math> math xmlns="http://www.w3.org/1998/Math/MathML" display="inline">mi>L/mi>/math>-shell electron captures in liquid xenon

Atmospheric neutrinos in next-generation xenon and argon dark matter experiments

“…[32], which account for a ∼23% suppression of the rate due to atomic binding effects. Additionally, we account for a ∼9% reduction of the charge yield for L-shell electron recoils, as recently observed in electron-capture calibrations of the XELDA detector [33]. This has the effect of widening the solar neutrino electronic recoil band and thus slightly increases the number of electronic recoil background events in the nuclear recoil signal band.…”

Cosmogenic production of $^{37}$Ar in the context of the LUX-ZEPLIN experiment

“…The Noble Element Simulation Technique (NEST) [13,14] is a response model which well-describes S1 and S2 production for low-energy ER sources [15,16] including 37 Ar [10,17]. The S2/S1 signal from 37 Ar electron capture may be slightly affected by the atomic relaxation following the K-shell vacancy, but a recent measurement of 127 Xe electron capture indicates this should be a very small effect in 37 Ar [18] and thus this effect is not considered here.…”

Snowmass2021 Cosmic Frontier White Paper: Calibrations and backgrounds for dark matter direct detection

“…Historically, a universal ER response has been applied to neutrino-induced ERs, however, at low energies the electronic structure of the target atoms becomes important. A simple, data-driven model of this effect (calibrated using electron capture sources) predicts only a small impact on overall sensitivity for next-generation DM experiments [69], but the low-side tail of the ionization-toscintillation ratio has not been measured for this class of events. Internal electroncapture sources can be used to calibrate this effect [69][70][71].…”

“…A simple, data-driven model of this effect (calibrated using electron capture sources) predicts only a small impact on overall sensitivity for next-generation DM experiments [69], but the low-side tail of the ionization-toscintillation ratio has not been measured for this class of events. Internal electroncapture sources can be used to calibrate this effect [69][70][71]. One of the dominant backgrounds for solid state detectors in the keV-range is Compton scattering, which arises from higher energy photons emitted by background sources scattering off atomic shells, which presents a flat background down until the binding energies-at each of which there are unique step like features in the energy spectra [72,73].…”