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

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Publication Date
2022-09-13
Authors
Domínguez Bugarín, A.
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Springer
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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.
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Artículo firmado por 17 autores. This work was supported by the Spanish Grants No. PID2019-104714GB-C21, PID2019-104714GB-C22, RTI2018-098868-B-I00, FPA2017-83946-C2-1-P and FPA2017-83946-C2-2-P (MCIN, MCIU, MINECO /AEI/FEDER). We acknowledge the support of the Generalitat Valenciana Grant no. PROMETEO/2019/007. We are grateful to Laboratorio Subterráneo de Canfranc for hosting the HENSA spectrometer, for the support received by the LSC personnel during the measurement campaign in Hall A and for providing us with the environmental data.
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