Eur. Phys. J. C (2022) 82: 515
https://doi.org/10.1140/epjc/s10052-022-10471-1

Regular Article - Experimental Physics

Observation of the temperature and barometric effects on the cosmic muon flux by the DANSS detector

¹ Alikhanov Institute for Theoretical and Experimental Physic NRC “Kurchatov Institute”, B. Cheremushkinskaya str. 25, 117218, Moscow, Russia
² National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Kashirskoe highway 31, 115409, Moscow, Russia
³ Moscow Institute of Physics and Technology, Institutskiy lane 9, 141701, Dolgoprudny, Moscow Region, Russia
⁴ Joint Institute for Nuclear Research, Joliot-Curie str. 6, 141980, Dubna, Moscow Region, Russia
⁵ Dubna State University, Universitetskaya str. 19, 141982, Dubna, Moscow Region, Russia
⁶ Lebedev Physical Institute of the Russian Academy of Sciences, Leninskiy avenue 53, 119991, Moscow, Russia
⁷ Voronezh State University, Universitetskaya square 1, 1394018, Voronezh, Russia
⁸ Federal State Unitary Enterprise Dukhov Automatics Research Institute, Sushchevskaya 22, 127055, Moscow, Russia

^u eduk007@yandex.ru

Received: 7 December 2021
Accepted: 27 May 2022
Published online: 8 June 2022

Abstract

The DANSS detector (Alekseev et al. in JINST 11:P11011, 2016) is located directly below a commercial reactor core at the Kalinin Nuclear Power Plant. Such a position provides an overburden about 50 m.w.e. in vertical direction. In terms of the cosmic rays it occupies an intermediate position between surface and underground detectors. The sensitive volume of the detector is a cubic meter of plastic scintillator with fine segmentation and combined PMT and SiPM readout, surrounded by multilayer passive and active shielding. The detector can reconstruct muon tracks passing through its sensitive volume. The main physics goal of the DANSS experiment implies the antineutrino spectra measurements at various distances from the source. This is achieved by means of a lifting platform so that the data is taken in three positions – 10.9, 11.9 and 12.9 meters from the reactor core. The muon data were collected for nearly four calendar years. The overburden parameters $⟨E_{\mathit{thr}}cos\theta ⟩$ and $⟨E_{\mathit{thr}}⟩$, as well as the temperature and barometric correlation coefficients are evaluated separately for the three detector positions and, in each position, in three ranges of the zenith angle – for nearly vertical muons with $cos\theta >0.9$, for nearly horizontal muons with $cos\theta <0.36$, and for the whole upper hemisphere.