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High Energy Physics - Experiment, hep-ex,Nuclear Experiment, nucl-ex
Abstract:
Double Chooz is unique among modern reactor-based neutrino experiments
studying $\bar \nu_e$ disappearance in that data can be collected with all
reactors off. In this paper, we present data from 7.53 days of reactor-off
running. Applying the same selection criteria as used in the Double Chooz
reactor-on oscillation analysis, a measured background rate of 1.0$\pm$0.4
events/day is obtained. The background model for accidentals, cosmogenic
$\beta$-$n$-emitting isotopes, fast neutrons from cosmic muons, and
stopped-$\mu$ decays used in the oscillation analysis is demonstrated to be
correct within the uncertainties. Kinematic distributions of the events, which
are dominantly cosmic-ray-produced correlated-background events, are provided.
The background rates are scaled to the shielding depths of two other
reactor-based oscillation experiments, Daya Bay and RENO.