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Abstract
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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1 Université de Strasbourg, CNRS, Strasbourg, France
2 Laboratory of Applied Bioacoustics, Technical University of Catalonia, Vilanova i la Geltrú, Barcelona, Spain
3 INFN - Sezione di Genova, Genova, Italy
4 Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen Centre for Astroparticle Physics, Erlangen, Germany
5 Institut d’Investigació per a la Gestió Integrada de les Zones Costaneres (IGIC), Universitat Politècnica de València, Gandia, Spain
6 Aix Marseille Univ, CNRS/IN2P3, CPPM, Marseille, France
7 APC, Univ Paris Diderot, CNRS/IN2P3, CEA/Irfu, Obs de Paris, Sorbonne Paris Cité, Paris, France
8 IFIC - Instituto de Física Corpuscular (CSIC - Universitat de València), Paterna, Valencia, Spain
9 LAM - Laboratoire d’Astrophysique de Marseille, Pôle de l’Étoile Site de Château-Gombert, Marseille Cedex 13, France
10 National Center for Energy Sciences and Nuclear Techniques, Rabat, Morocco
11 INFN - Laboratori Nazionali del Sud (LNS), Catania, Italy
12 Nikhef, Science Park, Amsterdam, The Netherlands; Huygens-Kamerlingh Onnes Laboratorium, Universiteit Leiden, Leiden, The Netherlands
13 Faculty of Sciences, University Mohammed V in Rabat, Rabat, Morocco
14 Nikhef, Science Park, Amsterdam, The Netherlands
15 Institute of Space Science, Bucharest, Măgurele, Romania
16 Nikhef, Science Park, Amsterdam, The Netherlands; Instituut voor Hoge-Energie Fysica, Universiteit van Amsterdam, Amsterdam, The Netherlands
17 INFN - Sezione di Roma, Roma, Italy; Dipartimento di Fisica dell’Università La Sapienza, Roma, Italy
18 INFN - Sezione di Roma, Roma, Italy; Dipartimento di Fisica dell’Università La Sapienza, Roma, Italy; Gran Sasso Science Institute, L’Aquila, Italy
19 LPHEA, Faculty of Science - Semlali, Cadi Ayyad University, Marrakech, Morocco
20 INFN - Sezione di Bologna, Bologna, Italy
21 INFN - Sezione di Bari, Bari, Italy
22 APC, Univ Paris Diderot, CNRS/IN2P3, CEA/Irfu, Obs de Paris, Sorbonne Paris Cité, Paris, France; IFIC - Instituto de Física Corpuscular (CSIC - Universitat de València), Paterna, Valencia, Spain
23 Department of Computer Architecture and Technology/CITIC, University of Granada, Granada, Spain
24 Géoazur, UCA, CNRS, IRD, Sophia Antipolis, France
25 INFN - Sezione di Genova, Genova, Italy; Dipartimento di Fisica dell’Università, Genova, Italy
26 APC, Univ Paris Diderot, CNRS/IN2P3, CEA/Irfu, Obs de Paris, Sorbonne Paris Cité, Paris, France; Université Paris-Sud, Orsay Cedex, France
27 Laboratory of Physics of Matter and Radiations, University Mohammed I, Oujda, Morocco
28 Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Würzburg, Germany
29 Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen Centre for Astroparticle Physics, Erlangen, Germany; Aix Marseille Univ, CNRS/IN2P3, CPPM, Marseille, France
30 APC, Univ Paris Diderot, CNRS/IN2P3, CEA/Irfu, Obs de Paris, Sorbonne Paris Cité, Paris, France; Dipartimento di Fisica e Astronomia dell’Università, Bologna, Italy
31 APC, Univ Paris Diderot, CNRS/IN2P3, CEA/Irfu, Obs de Paris, Sorbonne Paris Cité, Paris, France; Laboratoire de Physique Corpusculaire, Clermont Université, Université Blaise Pascal, CNRS/IN2P3, Clermont-Ferrand, France
32 LIS, UMR Université de Toulon, Aix Marseille Université, CNRS, Toulon, France
33 Royal Netherlands Institute for Sea Research (NIOZ) and Utrecht University, ’t Horntje (Texel), The Netherlands
34 APC, Univ Paris Diderot, CNRS/IN2P3, CEA/Irfu, Obs de Paris, Sorbonne Paris Cité, Paris, France; Institut Universitaire de France, Paris, France
35 Dr. Remeis-Sternwarte and ECAP, Friedrich-Alexander-Universität Erlangen-Nürnberg, Bamberg, Germany
36 INFN - Sezione di Genova, Genova, Italy; Skobeltsyn Institute of Nuclear Physics, Leninskie gory, Moscow State University, Moscow, Russia
37 Mediterranean Institute of Oceanography (MIO), Aix-Marseille University, Marseille Cedex 9, France; Université du Sud Toulon-Var, CNRS-INSU/IRD, La Garde Cedex, France
38 INFN - Sezione di Catania, Catania, Italy
39 INFN - Sezione di Bologna, Bologna, Italy; Dipartimento di Fisica e Astronomia dell’Università, Bologna, Italy
40 APC, Univ Paris Diderot, CNRS/IN2P3, CEA/Irfu, Obs de Paris, Sorbonne Paris Cité, Paris, France; Direction des Sciences de la Matière - Institut de recherche sur les lois fondamentales de l’Univers - Service de Physique des Particules, CEA Saclay, Gif-sur-Yvette Cedex, France
41 INFN - Sezione di Pisa, Pisa, Italy; Dipartimento di Fisica dell’Università, Pisa, Italy
42 INFN - Sezione di Napoli, Via Cintia, Napoli, Italy; Dipartimento di Fisica dell’Università Federico II di Napoli, Napoli, Italy
43 INFN - Sezione di Napoli, Via Cintia, Napoli, Italy
44 Dpto. de Física Teórica y del Cosmos and C.A.F.P.E, University of Granada, Granada, Spain
45 Aix Marseille Univ, CNRS/IN2P3, CPPM, Marseille, France; LAM - Laboratoire d’Astrophysique de Marseille, Pôle de l’Étoile Site de Château-Gombert, Marseille Cedex 13, France
46 Institut universitaire de technologie de Colmar, GRPHE - Université de Haute Alsace, Colmar, France
47 Direction des Sciences de la Matière - Institut de recherche sur les lois fondamentales de l’Univers - Service de Physique des Particules, CEA Saclay, Gif-sur-Yvette Cedex, France