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A measurement of the depth dependence of the coincidence rates induced by atmospheric muons was performed using the first two KM3NeT Detection Units.  The Detection Units are positioned at a depth of approximately 3.5 km. Even though the large water overburden shields them from the bulk of the cosmic ray air shower particles, a significant amount of downgoing atmospheric muons reaches the detector. Due to the considerable height of the strings (approximately 630 m from the lowest to the highest module) the muon flux is expected to change along the strings.  For this analysis every Digital Optical Module is considered as a stand-alone unit. The KM3NeT multi-PMT design allows each optical module to be calibrated in-situ and allows to identify atmospheric muon events by requiring high-multiplicity local coincidences.  The excellent agreement between the data and the Monte Carlo simulations confirms that the measured coincidence rate as a function of the depth matches the expected behaviour due to the depth dependence of the atmospheric muon flux.

Measurement of the depth dependence of coincidence rates induced by atmospheric muons with the first two KM3NeT Detection Units