| HAL : in2p3-00696140, version 1 |
| arXiv : 1001.4383 |
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| Monitoring of the thermal neutron flux in the LSM underground laboratory |
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| (2010) |
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| This 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 $\Phi_{MB}=3.57\pm0.05^{stat}\pm0.27^{syst}\times 10^{-6}$ 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. |
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| HELFA CSNSM PS1 CSNSM INSTR |
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| Thème(s) | : | Physique/Astrophysique/Instrumentation et méthodes pour l'astrophysique Planète et Univers/Astrophysique/Instrumentation et méthodes pour l'astrophysique |
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| Lien vers le texte intégral : |
| in2p3-00696140, version 1 | |
| http://hal.in2p3.fr/in2p3-00696140 | |
| oai:hal.in2p3.fr:in2p3-00696140 | |
| Contributeur : Sylvie Florès | |
| Soumis le : Vendredi 11 Mai 2012, 08:26:09 | |
| Dernière modification le : Mardi 15 Mai 2012, 13:58:16 | |