The study of the thermal neutron flux in the deep underground laboratory DULB-4900
V. V. Alekseenko, Yu. M. Gavrilyuk, A. M. Gangapshev, A. M. Gezhaev,, D. D. Dzhappuev, V. V. Kazalov, A. U. Kudzhaev, V. V. Kuzminov, S. I., Panasenko, S. S. Ratkevich, D. A. Tekueva, S. P. Yakimenko, Yu. V. Sten'kin
TL;DR
This study measures thermal neutron flux in the deep underground DULB-4900 laboratory, revealing an annual modulation correlated with air humidity, with variations exceeding 5%.
Contribution
It provides the first detailed measurement of thermal neutron flux modulation and its correlation with environmental humidity in an underground lab.
Findings
Annual modulation of thermal neutron flux observed.
Thermal neutron flux correlates with air humidity.
Modulation amplitude exceeds 5% of total neutron flux.
Abstract
We report on the study of thermal neutron flux using monitors based on mixture of ZnS(Ag) and LiF enriched with a lithium-6 isotope at the deep underground laboratory DULB-4900 at the Baksan Neutrino Observatory. An annual modulation of thermal neutron flux in DULB-4900 is observed. Experimental evidences were obtained of correlation between the long-term thermal neutron flux variations and the absolute humidity of the air in laboratory. The amplitude of the modulation exceed 5\% of total neutron flux.
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Taxonomy
TopicsAstrophysics and Cosmic Phenomena · Neutrino Physics Research · Quantum, superfluid, helium dynamics