Direct measurement of backgrounds using reactor-off data in Double Chooz
Author(s)Conrad, Janet; Jones, Christopher LaDon; Spitz, Joshua B.; Terao, Yasuaki; Winslow, L.
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Double Chooz is unique among modern reactor-based neutrino experiments studying ν¯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±0.4 events/day is obtained. The background model for accidentals, cosmogenic β-n-emitting isotopes, fast neutrons from cosmic muons, and stopped-μ 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.
DepartmentMassachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Plasma Science and Fusion Center
Physical Review D
American Physical Society
Abe, Y., C. Aberle, J. C. dos Anjos, J. C. Barriere, M. Bergevin, A. Bernstein, T. J. C. Bezerra, et al. “Direct Measurement of Backgrounds Using Reactor-Off Data in Double Chooz.” Phys. Rev. D 87, no. 1 (January 2013).