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  • Letter

First results of the νGeN experiment on coherent elastic neutrino-nucleus scattering

I. Alekseev, K. Balej, V. Belov, S. Evseev, D. Filosofov, M. Fomina, Z. Hons, D. Karaivanov, S. Kazartsev, J. Khushvaktov, A. Kuznetsov, A. Lubashevskiy, D. Medvedev, D. Ponomarev, A. Rakhimov, K. Shakhov, E. Shevchik, M. Shirchenko, K. Smolek, S. Rozov, I. Rozova, S. Vasilyev, E. Yakushev, and I. Zhitnikov (νGeN collaboration)
Phys. Rev. D 106, L051101 – Published 8 September 2022
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    Abstract

    The νGeN experiment is aimed to investigate neutrino properties using antineutrinos from the reactor of the Kalinin Nuclear Power Plant. The experimental setup is located at about 11 meters from the center of the 3.1 GWth reactor core. Scattering of the antineutrinos from the reactor is detected with low energy threshold high purity germanium detector. Passive and active shieldings are used to suppress all kinds of backgrounds coming from surrounding materials and cosmic radiation. The description of the experimental setup together with the first results is presented. The data taken in regimes with reactor on (94.50 days) and reactor off (47.09 days) have been compared. No significant difference between spectra of two datasets is observed, i.e., no positive signals for coherent elastic neutrino-nucleus scattering are detected. Under Standard Model assumptions about coherent neutrino scattering an upper limit on a quenching parameter k<0.26 (90% CL) in germanium has been set.

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    • Received 11 May 2022
    • Accepted 12 August 2022

    DOI:https://doi.org/10.1103/PhysRevD.106.L051101

    © 2022 American Physical Society

    Physics Subject Headings (PhySH)

    1. Research Areas
    Nuclear reactorsNucleus-neutrino interactions
    1. Physical Systems
    Neutrinos
    1. Techniques
    Neutrino detectionParticle detectors
    Nuclear PhysicsParticles & Fields

    Authors & Affiliations

    I. Alekseev1, K. Balej2,3, V. Belov1, S. Evseev1, D. Filosofov1, M. Fomina1, Z. Hons1,2, D. Karaivanov1,4, S. Kazartsev1, J. Khushvaktov1, A. Kuznetsov1, A. Lubashevskiy1,*, D. Medvedev1, D. Ponomarev1, A. Rakhimov1,5, K. Shakhov1, E. Shevchik1, M. Shirchenko1, K. Smolek2, S. Rozov1, I. Rozova1, S. Vasilyev1, E. Yakushev1, and I. Zhitnikov1 (νGeN collaboration)

    • 1Dzhelepov Laboratory of Nuclear Problems, JINR, Joliot-Curie 6, 141980 Dubna, Russia
    • 2Institute of Experimental and Applied Physics, Czech Technical University in Prague, Husova 240/5, 110 00 Prague 1, Czech Republic
    • 3Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, 121 16 Prague 2, Czech Republic
    • 4Institute of Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, 72 Tzarigradsko Shaussee, 1784 Sofia, Bulgaria
    • 5Institute of Nuclear Physics of Uzbekistan Academy of Sciences (INP ASRUz), Tashkent 100214, Uzbekistan

    • *lubashev@jinr.ru.

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    Issue

    Vol. 106, Iss. 5 — 1 September 2022

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    Images

    • Figure 1
      Figure 1

      Scheme of the νGeN shielding. Top view.

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    • Figure 2
      Figure 2

      Scheme of the acquisition system.

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    • Figure 3
      Figure 3

      Energy calibration of one of the channels performed with the pulse generator and cosmogenic line. Position of 1.298 keV line is used for verification of the calibration.

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    • Figure 4
      Figure 4

      Efficiency of signal detection measured with the pulse generator.

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    • Figure 5
      Figure 5

      Energy spectrum before (black) and after application of quality cuts (blue) and anti-coincidences with muon veto (red).

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    • Figure 6
      Figure 6

      Thermal power of the reactor unit 3 during measurements and periods of data taking.

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    • Figure 7
      Figure 7

      Comparison of the spectrum taken with the working reactor with the expected spectrum from CEνNS. ROI indicates an energy interval with a maximal sensitivity for CEνNS.

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    • Figure 8
      Figure 8

      Low energy part of the spectra taken during reactor on (red) and reactor off (black) periods.

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    • Figure 9
      Figure 9

      Residual spectrum (on-off). Red solid and dashed lines demonstrate predictions from CEνNS with k=0.179 and k=0.26 respectively.

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