A technique for studying single electron noise in emission detectors that are intended for detec tion of rare processes with small energy releases is developed. Examples of possible applications are experi ments for search of dark matter in the Universe and detection of reactor antineutrinos via coherent neutrino scattering at heavy xenon nuclei. We present the first results of studying the nature of single electron noise in a liquid xenon emission detector and consider possible ways to suppress it.Note: µ 0 is the electron mobility in the zero field approximation; V 0 is the potential energy of the electron ground state; E c is the critical field in which electron heating is initiated; E 0 is the field corresponding to the emission threshold; and t e is the emission time.

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A combined passive shield of the RED-100 two-phase emission neutrino detector has been developed and built for suppressing the background of external γ rays and neutrons. The shield is composed of a 5-cm-thick copper layer (the inner layer is adjacent to the detector) and a water layer with a total thickness of approximately 70 cm (including the water inside the copper shield). The Monte Carlo simulation of the shielding efficiency has been performed. The obtained attenuation factor of the copper shield for the γ-ray background has been experimentally verified in a laboratory test using a NaI(Tl) scintillator detector. The γ-ray background rejection factor of the full shield has also been calculated.