Abstract
In March 2013, the Nemo Phase-2 tower was successfully deployed at 80 km off-shore Capo Passero (Italy) at 3500 m depth. The tower operated continuously until August 2014. We present the results of the atmospheric muon analysis from the data collected in 411 days of live time. The zenith-angle distribution of atmospheric muons was measured and results compared with Monte Carlo simulations. The associated depth intensity relation was then measured and compared with previous measurements and theoretical predictions.
Highlights
High energy neutrinos are considered optimal probes to identify the sources of high energy cosmic rays
We present the results of the atmospheric muon analysis from the data collected in 411 days of live time
After a description of the detector, we report on the measurement of the atmospheric muon angular distribution and on the comparison with Monte Carlo simulations
Summary
High energy neutrinos are considered optimal probes to identify the sources of high energy cosmic rays. Their detection is one of the most interesting topics of astroparticle physics. A first small-scale prototype, a tower-like detection unit (NEMO Phase-1 tower), was operated for five months during 2007 at 2080 m depth offshore Catania (Italy) [10]. In March 2013, a larger scale prototype (NEMO Phase-2 tower) was deployed in the Capo Passero site at a depth of 3458 m. This detector was continuously operated for more than one year. The present analysis extends the muon depth intensity relation measured in water up to 13 km
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