Monitoring of the thermal neutron flux in the LSM underground laboratory
Monitoring of the thermal neutron flux in the LSM underground laboratory
复制标题
LSM地下实验室热中子通量监测
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
M. Chapellier
中科院分区：
文献类型：
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作者：
S. Rozov;V. Kozlov;A. Broniatowski;S. Scorza;S. Marnieros;X. Navick;D. Filosofov;L. Vagneron;F. Charlieux;A. Benoit;V. Brudanin;L. Berg'e;E. Armengaud;A. Juillard;S. Semikh;K. Eitel;M. Hannawald;J. Domange;J. Blümer;L. Dumoulin;Y. Dolgorouki;O. Crauste;M. Jésus;M. Gros;B. Paul;R. Lemrani;J. Gascon;M.;G. Gerbier;G. Chardin;S. Collin;A. Lubashevskiy;H. Kluck;P. Pari;E. Olivieri;E. Yakushev;P. D. Stefano;C. Nones;O. Besida;X. Defay;C. Augier;A. Chantelauze;V. Sanglard;C. Marrach;M. Chapellier
本文介绍了在LSM地下实验室的EDELWEISS-II暗物质搜索实验附近的热中子通量的精确测量，以及在其他各种位置的短测量。利用装有低本底正比计数管的移动的探测系统实现了对热中子通量的监测。平均每天检测到75个中子，背景水平低于每天1个计数（cpd）。这提供了一个独特的可能性，每天在一个深地下站点的中子场的变化的研究。在EDELWEISS-II附近测得的平均每厘米4 $\pi $中子通量为$\Phi_{MB}=3.57\pm0.05^{stat}\pm0.27^{syst}\x 10^{-6}$中子/秒。我们报告的第一个实验观察，点到点的热中子通量在LSM的变化超过一个因素2。
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.