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28 March 2024
 
  » arxiv » 1001.4383

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Monitoring of the thermal neutron flux in the LSM underground laboratory
S. Rozov ; E. Armengaud ; C. Augier ; L. Bergé ; A. Benoit ; O. Besida ; J. Blümer ; A. Broniatowski ; V. Brudanin ; A. Chantelauze ; M. Chapellier ; G. Chardin ; F. Charlieux ; S. Collin ; O. Crauste ; M. De Jesus ; X. Defay ; P. Di Stefano ; Y. Dolgorouki ; J. Domange ; L. Dumoulin ; K. Eitel ; D. Filosofov ; J. Gascon ; G. Gerbier ; M. Gros ; M. Hannawald ; A. Juillard ; H. Kluck ; V. Kozlov ; R. Lemrani ; A. Lubashevskiy ; C. Marrach ; S. Marnieros ; X-F. Navick ; C. Nones ; E. Olivieri ; P. Pari ; B. Paul ; V. Sanglard ; S. Scorza ; S. Semikh ; M-A. Verdier ; L. Vagneron ; E. Yakushev ;
Date 25 Jan 2010
AbstractThis paper describes precise measurements of the thermal neutron flux in the LSM underground laboratory in proximity of the EDELWEISS-II dark matter search experiment together with short measurements at various other locations. Monitoring of the flux of thermal neutrons is accomplished using a mobile detection system with low background proportional counter filled with $^3$He. On average 75 neutrons per day are detected with a background level below 1 count per day (cpd). This provides a unique possibility of a day by day study of variations of the neutron field in a deep underground site. The measured average 4$pi$ neutron flux per cm$^{2}$ in the proximity of EDELWEISS-II is $Phi_{MB}=3.57pm0.05^{stat}pm0.27^{syst} imes 10^{-6}$ neutrons/sec. We report the first experimental observation that the point-to-point thermal neutron flux at LSM varies by more than a factor two.
Source arXiv, 1001.4383
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