Abstract—
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.
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ACKNOWLEDGMENTS
We are grateful to Yu.M. Gavrilyuk, V.V. Kazalov, and V.V. Kuz’minov measurements of radiation-shield samples at the Baksan Neutrino Observatory of the Institute for Nuclear Research .
Funding
We express our gratitude to JSC Science and Innovations (Scientific Division of the Rosatom State Corporation), the Russian Science Foundation (contract no. 18-12-00135 dated April 12, 2018) for the cooperation and support in carrying out the experiment at the Kalinin NPP, the Competitiveness Enhancement Program of National Research Nuclear University MEPhI (contract no. 02.a03.21.0005 dated August 27, 2013,), and the Ministry of Science and Higher Education of the Russian Federation (Fundamental Properties of Elementary Particles and Cosmology Project no. 0723-2020-0041).
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Translated by N. Goryacheva
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Akimov, D.Y., Aleksandrov, I.S., Belov, V.A. et al. A Passive Shield for the RED-100 Neutrino Detector. Instrum Exp Tech 64, 202–208 (2021). https://doi.org/10.1134/S0020441221020093
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DOI: https://doi.org/10.1134/S0020441221020093