Neutron Studies at the Canfranc Underground Laboratory

Details Neutron Studies at the Canfranc Underground Laboratory Neutron Studies at the Canfranc Underground Laboratory

Apr 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005idm..conf..465l&link_type=abstract

THE IDENTIFICATION OF DARK MATTER. Proceedings of the Fifth International Workshop. Held 6-10 September 2004 in Edinburgh, UK. E

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Four sets of the IGEX-DM low energy data, obtained with different neutron-shielding conditions, have been compared to simulations to quantify the neutron populations from different sources: the flux of neutrons coming from the radioactivity of the surrounding rock, (3.82 ± 0.44) × 10-6 cm-2s-1, the flux of muon-induced neutrons in the rock, (1.73 ± 0.22(stat)±0.69(syst))×10-9 cm-2s-1 and the rate of neutron production by muons in the lead shielding, (4.8 ± 0.6(stat)±1.9(syst))×10-9 cm-3s-1. It can be concluded that a suitable neutron shielding practically eliminates the main contribution (rock radioactivity neutrons) to the IGEX background at the present level of sensitivity, while the remaining neutron populations (muon-induced neutrons in the rock or in the shielding) are below the present background level thanks to the veto system. These neutron studies are extremely useful to understand the effect of neutrons in other current and future experiments at the Canfranc Underground Laboratory.

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