Monte Carlo evaluation of the external gamma, neutron and muon induced background sources in the CUORE experiment

CUORE is a 1 ton scale cryogenic experiment aiming at the measurement of the Majorana mass of the electron neutrino The detector is an array of 988 TeO2 bolometers used for a calorimetric detection of the two electrons emitted in the beta beta(0v) of Te-130 The sensitivity of the experiment to the lowest Maim ana mass is determined by the rate of background events that can mimic a beta beta(0v) In this paper, we investigate the contribution of external sources. i.e. environmental gammas, neutrons and cosmic ray muons to the CUORE background and show that the shielding setup designed for CUORE guarantees a reduction of this external background down to a level <10(-2) counts/kg key yr at the Q-value, as required by the physical goal of the experiment. (C) 2010 Elsevier B.V. All rights reserved.