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Statistical Data Analysis in the DANSS Experiment Including Antineutrino Relative Count Rate Data as a Function of Distance

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Abstract

The DANSS detector, i.e., a scintillation detector with a sensitive volume of 1 m3, is installed at the Kalinin Nuclear Power Plant under the reactor on a moving stage. The distance from the detector center to the reactor core center can be varied from 10.9 to 12.9 m. The detector records about 5000 events of inverse beta decay per day with a background level from cosmic muons of the order of two percent. An analysis on the search for the sterile neutrino, based on only the ratio of spectra shapes at various distances is compared with an analysis which, along with the shape, accounts for changes in relative count rates. The effect of systematic errors contributing to the analysis using relative count rates is discussed. The analysis considering three detector positions is described.

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ACKNOWLEDGMENTS

The detector development was supported by the “RosAtom” State corporation within state contract nos. 4kh.44.90.13.1119 and 4kh.44.9B.16.1006. The data analysis was supported by the Russian Science Foundation, project 17-12-01145P.

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Authors and Affiliations

  1. Lebedev Physical Institute, Russian Academy of Sciences, 119991, Moscow, Russia

    N. A. Skrobova

  2. Alikhanov Institute for Theoretical and Experimental Physics NRC “Kurchatov Institute”, 117218, Moscow, Russia

    N. A. Skrobova

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  1. N. A. Skrobova
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Correspondence to N. A. Skrobova.

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Translated by A. Kazantsev

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Skrobova, N.A. Statistical Data Analysis in the DANSS Experiment Including Antineutrino Relative Count Rate Data as a Function of Distance. Bull. Lebedev Phys. Inst. 47, 271–275 (2020). https://doi.org/10.3103/S1068335620090067

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  • DOI: https://doi.org/10.3103/S1068335620090067

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