Neutral Bremsstrahlung Electroluminescence in Noble Liquids Revisited

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Abstract

Recent discovery of neutral bremsstrahlung (NBrS) mechanism of electroluminescence (EL) in noble gases in two-phase detectors for dark matter searches has led to a prediction that NBrS EL should be present in noble liquids as well. A rigorous theory of NBrS EL in noble liquids was developed accordingly in the framework of Cohen–Leckner and Atrazhev formalism. It has been recently followed by the first experimental observation of NBrS EL in liquid argon, which however deviates significantly from the previous theory. Given these results, we revise previous theoretical calculations of EL NBrS in noble liquids to be consistent with experiment. In particular, NBrS EL yield and spectra were calculated in this work for argon, krypton, and xenon with momentum-transfer cross section for electron scattering (instead of energy-transfer one) being used for calculation of NBrS cross section. The results for light noble liquids, helium and neon, are also reexamined.

About the authors

A. F. Buzulutskov

Budker Institute of Nuclear Physics, Siberian Branch, Russian Academy of Sciences; Novosibirsk State University

Email: E.O.Shemyakina@inp.nsk.su
630090, Novosibirsk, Russia; 630090, Novosibirsk, Russia

E. A. Frolov

Budker Institute of Nuclear Physics, Siberian Branch, Russian Academy of Sciences; Novosibirsk State University

Author for correspondence.
Email: E.O.Shemyakina@inp.nsk.su
630090, Novosibirsk, Russia; 630090, Novosibirsk, Russia

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