Neutron background at the Canfranc underground laboratory and its contribution to the IGEX-DM dark matter experiment

被引：38

作者：

Carmona, JM ^{[1
]}

Cebrián, S ^{[1
]}

García, E ^{[1
]}

Irastorza, IG ^{[1
]}

Luzón, G ^{[1
]}

Morales, A ^{[1
]}

Morales, J ^{[1
]}

de Solórzano, AO ^{[1
]}

Puimedón, J ^{[1
]}

Sarsa, ML ^{[1
]}

Villar, JA ^{[1
]}

机构：

[1] Univ Zaragoza, Lab Nucl & High Energy Phys, E-50009 Zaragoza, Spain

来源：

ASTROPARTICLE PHYSICS | 2004年 / 21卷 / 05期

关键词：

underground muons; dark matter; muon flux; neutron background;

D O I：

10.1016/j.astropartphys.2004.04.002

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A quantitative study of the neutron environment in the Canfranc Underground Laboratory has been performed. The analysis is based on a complete set of simulations and, particularly, it is focused on the IGEX-DM dark matter experiment. The simulations are compared to the IGEX-DM low energy data obtained with different shielding conditions. The results of the study allow us to conclude, with respect to the IGEX-DM background, that the main neutron population, coming from radioactivity from the surrounding rock, is practically eliminated after the implementation of a suitable neutron shielding. The remaining neutron background (muon-induced neutrons in the shielding and in the rock) is substantially below the present background level thanks to the muon veto system. In addition, the present analysis gives us a further insight on the effect of neutrons in other current and future experiments at the Canfranc Underground Laboratory. The comparison of simulations with the body of data available has allowed to set the flux of neutrons from radioactivity of the Canfranc rock (3.82 +/- 0.44) x 10(-6) cm(-2) s(-1), as well as the flux of muon-induced neutrons in the rock (1.73 +/- 0.22(stat) +/- 0.69(syst)) x 10(-9) cm(-2) s(-1), and the rate of neutron production by muons in the lead shielding (4.8 +/- 0.6(stat) +/- 1.9 (syst)) x 10(-9) cm(-3) s(-1). (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：523 / 533

页数：11

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