Regular Article - Experimental Physics
Neutral bremsstrahlung and excimer electroluminescence in noble gases and its relevance to two-phase dark matter detectors
Budker Institute of Nuclear Physics SB RAS, Lavrentiev Avenue 11, 630090, Novosibirsk, Russia
2 Novosibirsk State University, Pirogov Street 2, 630090, Novosibirsk, Russia
Accepted: 6 December 2021
Published online: 23 December 2021
Proportional electroluminescence (EL) is the physical effect used in two-phase detectors for dark matter searches, to optically record (in the gas phase) the ionization signal produced by particle scattering in the liquid phase. In our previous work the presence of a new EL mechanism, namely that of neutral bremsstrahlung (NBrS), was demonstrated in two-phase argon detectors both theoretically and experimentally, in addition to the ordinary EL mechanism due to excimer emission. In this work the similar theoretical approach is applied to all noble gases, i.e. overall to helium, neon, argon, krypton and xenon, to calculate the EL yields and spectra both for NBrS and excimer EL. The relevance of the results obtained to the development of two-phase dark matter detectors is discussed.
© The Author(s) 2021
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