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

Albert, A.; Andre, M.; Anghinolfi, M.; Anton, G.; Ardid, M.; Aubert, J. -J.; Aublin, J.; Avgitas, T.; Baret, B.; Barrios-Marti, J.; Basa, S.; Belhorma, B.; Bertin, V.; Biagi, S.; Bormuth, R.; Boumaaza, J.; Bourret, S.; Bouwhuis, M. C.; Branzas, H.; Bruijn, R.; Brunner, J.; Busto, J.; Capone, A.; Caramete, L.; Carr, J.; Celli, S.; Chabab, M.; El Moursli, R. C.; Chiarusi, T.; Circella, M.; Coelho, J. A. B.; Coleiro, A.; Colomer, M.; Coniglione, R.; Costantini, H.; Coyle, P.; Creusot, A.; Diaz, A. F.; Deschamps, A.; Distefano, C.; Palma, I. D.; Domi, A.; Donzaud, C.; Dornic, D.; Drouhin, D.; Eberl, T.; El Bojaddaini, I.; El Khayati, N.; Elsasser, D.; Enzenhofer, A.; Ettahiri, A.; Fassi, F.; Felis, I.; Ferrara, G.; Fusco, L. A.; Gay, P.; Glotin, H.; Gregoire, T.; Ruiz, R. G.; Graf, K.; Hallmann, S.; Van Haren, H.; Heijboer, A. J.; Hello, Y.; Hernandez-Rey, J. J.; Hossl, J.; Hofestadt, J.; Illuminati, G.; James, C. W.; De Jong, M.; Jongen, M.; Kadler, M.; Kalekin, O.; Katz, U.; Kouchner, A.; Kreter, M.; Kreykenbohm, I.; Kulikovskiy, V.; Lachaud, C.; Lahmann, R.; Lefevre, D.; Leonora, E.; Levi, G.; Lotze, M.; Loucatos, S.; Marcelin, M.; Margiotta, A.; Marinelli, A.; Martinez-Mora, J. A.; Mele, R.; Melis, K.; Migliozzi, P.; Moussa, A.; Navas, S.; Nezri, E.; Nunez, A.; Organokov, M.; Pavalas, G. E.; Pellegrino, C.; Piattelli, P.; Popa, V.; Pradier, T.; Quinn, L.; Racca, C.; Randazzo, N.; Riccobene, G.; Sanchez-Losa, A.; Saldana, M.; Salvadori, I.; Samtleben, D. F. E.; Sanguineti, M.; Sapienza, P.; Schussler, F.; Spurio, M.; Stolarczyk, T.; Taiuti, M.; Tayalati, Y.; Trovato, A.; Vallage, B.; Van Elewyck, V.; Versari, F.; Vivolo, D.; Wilms, J.; Zaborov, D.; Zornoza, J. D.; Zuniga, J.

doi:10.1140/epjc/s10052-018-6132-2

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.

Long-term monitoring of the ANTARES optical module efficiencies using 40K decays in sea water: The ANTARES Collaboration / Albert, A., Andre, M., Anghinolfi, M., Anton, G., Ardid, M., Aubert, J.-J., Aublin, J., Avgitas, T., Baret, B., Barrios-Marti, J., Basa, S., Belhorma, B., Bertin, V., Biagi, S., Bormuth, R., Boumaaza, J., Bourret, S., Bouwhuis, M.C., Branzas, H., Bruijn, R., et al.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - 78:8(2018). [10.1140/epjc/s10052-018-6132-2]