18-22 February 2019
Vienna University of Technology
Europe/Vienna timezone

Neutral bremsstrahlung in two-phase argon electroluminescence: first results and possible applications

20 Feb 2019, 09:25
20m
EI8 ()

EI8

Talk Dark matter and other low-background experiments Dark matter and other low-background experiments

Speaker

Ekaterina Shemyakina (Budker Institute of Nuclear Physics SB RAS)

Description

A new mechanism of proportional electroluminescence (EL) in two-phase Ar has been revealed, namely that of neutral bremsstrahlung (NBrS), that quantitatively describes the photon emission below the Ar excitation threshold and non-VUV component above the threshold. This paves the way for direct readout of electroluminescence (S2) signals in two-phase TPCs, using PMT and SiPM matrices, in particular in dark matter two-phase detectors. In addition, this mechanism predicts the enhanced contribution of the fast component to S2 signal, which can affect the correct determination of diffusion coefficients and z-coordinate fiducialization in liquid Ar detectors. The NBrS effect has a universal character: it should be present in all noble and molecular gases. It may also explain the non-VUV components observed earlier in various light emission processes, in particular the primary and secondary scintillations in noble liquids in the visible and NIR range.

Primary author

Ekaterina Shemyakina (Budker Institute of Nuclear Physics SB RAS)

Co-authors

Alexander Bondar (BudkerINP) Alexander Dolgov (INFN) Alexei Buzulutskov (Budker Institute of Nuclear Physics) Andrey Sokolov (Budker Institute of Nuclear Physics) Egor Frolov (Budker Institute of Nuclear Physics SB RAS) Valeriy Nosov (Budker Institute of Nuclear Physics SB RAS) Vladislav Oleynikov (Budker Institute of Nuclear Physics)

Presentation Materials