Modeling of GERDA Phase II data

The GERmanium Detector Array (GERDA) experiment at the Gran Sasso underground laboratory (LNGS) of INFN is searching for neutrinoless double-beta (0v/3/3) decay of 76Ge. The technological challenge of GERDA is to operate in a "background free" regime in the region of interest (ROI) after analysis cuts for the full 100 kg"yr target exposure of the experiment. A careful modeling and decomposition of the full -range energy spectrum is essential to predict the shape and composition of events in the ROI around Q,3,3 for the 0013 search, to extract a precise measurement of the half-life of the doublebeta decay mode with neutrinos (20/3) and in order to identify the location of residual impurities. The latter will permit future experiments to build strategies in order to further lower the background and achieve even better sensitivities. In this article the background decomposition prior to analysis cuts is presented for GERDA Phase II. The background model fit yields a flat spectrum in the ROI with a background index (BI) of 16.04 0:8785 " 10-3 cts/(keV"kg"yr) for the enriched BEGe data set and 14.68 0:4527 " 10-3 cts/(keV"kg"yr) for the enriched coaxial data set. These values are similar to the one of Phase I despite a much larger number of detectors and hence radioactive hardware components.