Baksan Neutrino Observatory INR RAS

Baksan Neutrino Observatory (Neutrino village, Kabardino-Balkarian Republic) with a complex of large-scale underground neutrino telescopes and large-area ground-based installations for research in the field of solar neutrino physics, cosmic ray physics and neutrino astrophysics. At the Baksan gallium-germanium neutrino telescope, precision measurements were made of the rate of capture of solar neutrinos by gallium nuclei, which, together with the results of a number of other experiments on solar neutrinos, provided unambiguous evidence of the thermonuclear nature of solar energy and led to the discovery of interconversions (oscillations) of neutrinos of various types. Starting in mid-2019, a new experiment, BEST (Baksan Experiment for Sterile Transition), has been conducted. Its goal is to study neutrino oscillations at record-breaking short distances and the possible detection of a new type of neutrino, the so-called sterile neutrino. The Laboratory of Low Background Research has obtained the world's best restrictions on the probability of double K-capture in nuclei 78Kr, 124Xe and double beta decay of a number of elements. The Carpet-3 experiment with the world's largest compact muon detector is aimed at achieving record sensitivity to diffuse gamma radiation with energies above 100 TeV.