Monitoring of the thermal neutron flux in the EDELWEISS II dark matter direct search experiment |
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Authors: | S V Rozov V B Brudanin A V Lubashevskiy S S Semikh D V Filosofov E A Yakushev and on behalf of EDELWEISS Collaboration |
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Institution: | (1) Ops La Carte, 990 Richard Ave. Suite 101, Santa Clara, CA 95050, USA |
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Abstract: | The results from measurements of thermal neutron flux in the EDELWEISS II experiment aimed at the direct detection of WIMPs
(weakly interacting massive particles) by means of cryogenic germanium bolometers are described. Detailed knowledge of the
neutron background is of crucial importance for the experiment, since neutrons with the MeV energy range of scattering seem
to be hard to distinguish from the expected WIMP signal within the bolometers. Monitoring of the thermal neutron flux is performed
using a mobile detection system with a low background proportional 3He counter. The neutron flux measurements were performed both outside and inside the device’s shielding, in the direct proximity
of a cryostat with built-in germanium detectors. The sensitivity of the created thermal neutron detection system is on the
level of 10−9 neutron (cm2 s)−1. |
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