Underground physics and the barometric pumping effect observed for thermal neutron flux underground

  • Yu. V. Stenkin
  • V. V. Alekseenko
  • D. M. Gromushkin
  • V. P. Sulakov
  • O. B. Shchegolev
Nuclei, Particles, Fields, Gravitation, and Astrophysics

Abstract

It is known that neutron background is a major problem for low-background experiments carrying out underground, such as dark matter search, double-beta decay searches and other experiments known as Underground Physics. We present here some results obtained with the en-detector of 0.75 m2, which is running for more than 4 years underground at a depth of 25 m water equivalent in Skobeltsyn Institute of Nuclear Physics, Moscow State University. Some spontaneous increases in thermal neutron flux up to a factor of 3 were observed in delayed anti-correlation with barometric pressure. The phenomenon can be explained by the radon barometric pumping effect resulting in similar effect in neutron flux being produced in (α, n)-reactions by alpha-decays of radon and its daughters in surrounding rock. This is the first demonstration of the barometric pumping effect observed in thermal neutron flux underground.

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Copyright information

© Pleiades Publishing, Inc. 2017

Authors and Affiliations

  • Yu. V. Stenkin
    • 1
    • 2
  • V. V. Alekseenko
    • 1
  • D. M. Gromushkin
    • 2
  • V. P. Sulakov
    • 3
  • O. B. Shchegolev
    • 1
  1. 1.Institute for Nuclear ResearchRussian Academy of ScienceMoscowRussia
  2. 2.National Research Nuclear University МЕРhI (Moscow Engineering Physics Institute)MoscowRussia
  3. 3.Skobeltsyn Institute of Nuclear PhysicsMoscow State UniversityMoscowRussia

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