Long-term evolution of the neutron rate at the Canfranc Underground Laboratory

Abstract

We report results on the long-term variation of the neutron counting rate at the Canfranc Underground Laboratory, of importance for several low-background experiments installed there, including rare-event searches. The measurement campaign was performed employing the High Efficiency Neutron Spectrometry Array (HENSA) mounted in Hall A and lasted 412 live days. The present study is the first long-term measurement of the neutron rate with sensitivity over a wide range of neutron energies (from thermal up to 0.1 GeV and beyond) performed in any underground laboratory so far. Data on the environmental variables inside the experimental hall (radon concentration, air temperature, air pressure and humidity) were also acquired during all the measurement campaign. We have investigated for the first time the evolution of the neutron rate for different energies of the neutrons and its correlation with the ambient variables.

12 pages, 5 figures, 2 tables

References in corpus (5)

• First results on dark matter annual modulation from ANAIS-112 experiment
• The ArDM Liquid Argon Time Projection Chamber at the Canfranc Underground Laboratory: a ton-scale detector for Dark Matter Searches
• Neutron flux and spectrum in the Dresden Felsenkeller underground facility studied by moderated ${}^3$He counters
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Cited by in corpus (4)

• The Felsenkeller shallow-underground laboratory for nuclear astrophysics
• Status of the HENSA collaboration at the Canfranc Underground Laboratory: results from two years of measurement of the neutron flux in hall B
• Neutron spectrum measurement in the Yemi underground laboratory
• Measurement of the ambient neutron flux and spectral distribution at the Canfranc Underground Laboratory