Abstract
The results of the experimental search for two-neutrino 2K-capture in 124Xe with a large copper proportional counter obtained by processing the data for an exposure of 37.7 kg day are presented. The experimental setup is located at the Underground Low-Background Laboratory of the Baksan Neutrino Observatory at a depth of 4900 m.w.e. The combination of methods of selection of useful signals with a unique set of characteristics and the event topology taken into account allowed us to suppress the background in the energy region of interest. A new half-life limit for 2K(2ν)-capture in 124Xe was determined: T1/2 ≥ 7.7 × 1021 years (90% CL).
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ACKNOWLEDGMENTS
This study was supported by the Fundamental Research Program “Fundamental Properties of Matter and Astrophysics” of the Presidium of the Russian Academy of Sciences and by the Russian Foundation for Basic Research, project no. Mol_a 16-32-00018 (2016).
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Gavriljuk, Y.M., Gangapshev, A.M., Kazalov, V.V. et al. 2K-Capture in 124Хе: Results of Data Processing for an Exposure of 37.7 kg day. Phys. Part. Nuclei 49, 563–568 (2018). https://doi.org/10.1134/S106377961804024X
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DOI: https://doi.org/10.1134/S106377961804024X