Simulation of the Cosmic Ray Moon Shadow in the Geomagnetic field

An accurate MonteCarlo simulation of the deficit of primary cosmic rays in the direction of the Moon has been developed to interpret the observations reported in the TeV energy region until now. Primary particles are propagated trough the geomagnetic field in the Earth-Moon system. The algorithm is described and the contributions of the detector resolution and of the geomagnetic field are disentangled.Comment: 4 pages, 5 figures, Contribution to the 31st ICRC, Lodz, Poland, July 200

Detection of anisotropies in the arrival directions of 600 GeV–10TeV cosmic rays with the ARGO-YBJ experiment

ARGO-YBJ is an RPC “carpet” aimed to the detection of extensive air showers induced by charged cosmic rays and gamma-rays in the energy range GeV–PeV. The data-set collected since November 2007 has been analyzed and very significant anisotropies (more than 10 standard deviations), with relative intensity of the order of 10−3 have been found. The observation is not explained with the current models of galactic magnetic field and propagation of cosmic rays in the Galaxy