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arxiv: 1805.08675 · v2 · submitted 2018-05-22 · 🌌 astro-ph.IM

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Long-term monitoring of the ANTARES optical module efficiencies using ⁴⁰K decays in sea water

ANTARES Collaboration: A. Albert , M. Andr\'e , M. Anghinolfi , G. Anton , M. Ardid , J.-J. Aubert , J. Aublin , T. Avgitas
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classification 🌌 astro-ph.IM
keywords antarestimecalibrationdecayslightmodulesneutrinooptical
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Cherenkov light induced by radioactive decay products is one of the major sources of background light for deep-sea neutrino telescopes such as ANTARES. These decays are at the same time a powerful calibration source. Using data collected by the ANTARES neutrino telescope from mid 2008 to 2017, the time evolution of the photon detection efficiency of optical modules is studied. A modest loss of only 20% in 9 years is observed. The relative time calibration between adjacent modules is derived as well.

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