Underground physics and the barometric pumping effect observed for thermal neutron flux underground
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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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- 1.Gas Transport in Porous Media, Ed. C. K. Ho and S. W. Webb, Vol. 20 of Theory and Applications of Transport in Porous Media (Springer, Dordrecht, 2006).Google Scholar
- 2.V. V. Mourzenko, C. Varloteaux, S. Guillon, et al., Geophys. Res. Lett. (2014). doi 10.1002/2014GL060865Google Scholar
- 7.Y. V. Sten’kin, in Nuclear Track Detectors: Design, Methods and Applications, Ed. by M. Sidorov and O. Ivanov (Nova Science, New York, 2010), Chap. 10, p. 253.Google Scholar
- 9.V. V. Alekseenko, Yu. M. Gavrilyuk, V. V. Kuzminov, and Yu. V. Stenkin, J. Phys.: Conf. Ser. 203, 012045 (2010).Google Scholar
- 10.S. N. Vernov, G. B. Khristiansen, V. B. Atrashkevich, et al., in Proceedings of the 16th International Cosmic Ray Conference, Kyoto, 1979 (1979), Vol. 6, p. 129.Google Scholar
- 11.V. V. Alekseenko, Yu. M. Gavrilyuk, V. V. Kuzminov, and Yu. V. Stenkin. http://taup2009.lngs.infn.it/slides/jul3/stenkin.pdf.Google Scholar