Abstract
The Double Chooz experiment is observing reactor neutrinos for the precise measurement of neutrino oscillation and neutrino mixing angle θ13 using a detector at 1050m away from reactor cores. θ13 is measured to be sin2 2θ13 = 0.109 ± 0.030(stat) ± 0.025(syst) using data set with live time of 227.93 days. Not only the number of events but also the energy spectrum are used in a fit to extract θ13. Therefore, it is important to evaluate the energy and the systematic uncertainty to realize precise measurement of θ13. In this article, details of calibration of the Double Chooz detector is described putting the focus on photo-multiplier (PMT) gain measurement.
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