Astronomy and Astrophysics – Astrophysics – Instrumentation and Methods for Astrophysics
Scientific paper
2009-07-31
Astronomy and Astrophysics
Astrophysics
Instrumentation and Methods for Astrophysics
4 pages, 2 figures, Proceeding of the 31st ICRC, Lodz, Poland, 2009
Scientific paper
Neutrino telescopes are opening new opportunities in observational high energy astrophysics. In these detectors, atmospheric muons from primary cosmic ray interactions in the atmosphere play an important role. They provide the most abundant source of events for calibration and for testing the reconstruction algorithms. On the other hand, they represent the major background source. The simulation of a statistically significant number of muons in large volume neutrino telescopes requires a big effort in terms of computing time. Some parameterizations are currently available, but they do not explicitly take into account the arrival of muons in bundles. A fast Monte Carlo generator (MUPAGE) was developed to generate single and multiple atmospheric muon events in underwater/ice neutrino telescopes. The code reduces the computing time for the simulation of atmospheric muons significantly. The event kinematics is produced on the surface of a user-defined cylinder, virtually surrounding the detector volume. The flux of muon bundles at different depths and zenith angles, the lateral spread and the energy spectrum of the muons in the bundles are based on parametric formulas. These formulas were obtained according to a specific primary cosmic ray flux model and constrained by the measurements of the muon flux in the MACRO underground experiment. Some MUPAGE applications are presented.
Bazzotti Marco
Biagi Simone
Carminati G.
Cecchini Simone
Chiarusi Tommaso
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