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arXiv · 1806.03060

2K(2\nu)-Capture in Xe-124: Results of Data Processing for an Exposure of 37.7 kg x day

Yu. M. Gavriljuk·A. M. Gangapshev·V. V. Kazalov·V. V. Kuzminov·S. I. Panasenko·S. S. Ratkevich·D. A. Tekueva
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Abstract

The results of the experimental search for two-neutrino $2K$-capture in $^{124}$Xe with a large copper proportional counter obtained by processing the data for an exposure of 37.7 kg$\times$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 $2K(2\nu)$-capture in $^{124}$Xe was determined: T$_{1/2}\geq7.7\cdot10^{21}$ yrs (90\% C.L.).

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Yu. M. Gavriljuk, A. M. Gangapshev, V. V. Kazalov, V. V. Kuzminov, S. I. Panasenko, S. S. Ratkevich, D. A. Tekueva. 2018-06-08. 2K(2\nu)-Capture in Xe-124: Results of Data Processing for an Exposure of 37.7 kg x day. https://doi.org/10.1134/s106377961804024x

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