Long-term monitoring of the ANTARES optical module efficiencies using 40K decays in sea water
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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.
CitationAlbert, A., Andre, M., Anghinolfi, M. Long-term monitoring of the ANTARES optical module efficiencies using 40K decays in sea water. "European physical journal C", 1 Agost 2018, vol. 78, núm. 669.