We report results on the long-term variation of the neutron rate at the Canfranc Underground Laboratory, of importance for the rare event searches located there. 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 to 10 GeV) carried on in any underground laboratory so far. Data on the environmental variables inside the experimental hall (radon concentration, air temperature, 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 connection with the ambient variables.
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