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The KM3NeT Collaboration has successfully deployed the first detection unitsof the next generation undersea neutrino telescopes in the Mediterranean Sea atthe two sites in Italy and in France. A sample of the data collected betweenDecember 2016 and January 2020 has been used to measure the atmospheric muonrate at two different depths under the sea level: 3.5 km with KM3NeT-ARCA and2.5 km with KM3NeT-ORCA. Atmospheric muons represent an abundant signal in aneutrino telescope and can be used to test the reliability of the Monte Carlosimulation chain and to study the physics of extensive air showers caused byhighly-energetic primary nuclei impinging the Earth's atmosphere. At energiesabove PeV the contribution from prompt muons, created right after the firstinteraction in the shower, is expected to become dominant, however itsexistence has not yet been experimentally confirmed. In this work, datacollected with the first detection units of KM3NeT are compared to Monte Carlosimulations based on MUPAGE and CORSIKA codes. The main features of thesimulation and reconstruction chains are presented. Additionally, the firstresults of the simulated signal from the prompt muon component for KM3NeT-ARCAand KM3NeT-ORCA obtained with CORSIKA are discussed.

journal of instrumentation

Comparison of the measured atmospheric muon rate with Monte Carlo  simulations and sensitivity study for detection of prompt atmospheric muons  with KM3NeT